commands.zig

1// commands.zig — all command handlers2// Orchestrates exec/api/output. Zero direct stdout writes.3const std = @import("std");4const builtin = @import("builtin");5const types = @import("types.zig");6const errors = @import("errors.zig");7const config = @import("config.zig");8const output = @import("output.zig");9const exec = @import("exec.zig");10const api = @import("api.zig");11const search_tui = @import("search.zig");12const version = @import("version.zig");1314const UPDATE_URL = "https://kepr.uk/api/nina/releases/latest";15const FLAKE_URL = "https://kepr.uk/nina/archive/HEAD.tar.gz#nina";1617const Semver = struct {18    major: u32,19    minor: u32,20    patch: u32,21};2223pub const Ctx = struct {24    gpa: std.mem.Allocator,25    io: std.Io,26    environ: *const std.process.Environ.Map,27    machine: types.Machine,28    cfg: types.NinaConfig,29    args: []const []const u8, // positional args after subcommand30    passthrough: []const []const u8, // unrecognized flags, forwarded verbatim to the wrapped nix command31    sub: []const u8, // subcommand (e.g. "list" in "service list")32    dry: bool,33    check: bool,34    no_apply: bool,35    all: bool,36    last: u32,37    json: bool,38    user: bool, // --user: operate on user (vs system) services39};4041// A system is flake-managed when the config says so OR a flake.nix is present in42// the config dir. Detection means a fresh channel user who points nina at a flake43// dir gets the right behavior without editing config first.44fn flakeSystem(ctx: Ctx) bool {45    return ctx.cfg.flake or exec.configHasFlake(ctx.gpa, ctx.io, &ctx.machine);46}4748fn runPreHook(ctx: Ctx, hook_name: []const u8) !bool {49    const hook = try exec.runHook(ctx.gpa, ctx.io, ctx.environ, hook_name);50    defer ctx.gpa.free(hook.output);51    switch (hook.result) {52        .not_found, .ok => return true,53        .failed => {54            output.hookFailed(hook_name, hook.exit_code, hook.output);55            return output.confirmDefaultNo("continue anyway?");56        },57    }58}5960fn runPostHook(ctx: Ctx, hook_name: []const u8) void {61    const hook = exec.runHook(ctx.gpa, ctx.io, ctx.environ, hook_name) catch return;62    defer ctx.gpa.free(hook.output);63    if (hook.result == .failed) {64        output.hookWarning(hook_name, hook.exit_code, hook.output);65    }66}6768pub fn apply(ctx: Ctx) !void {69    if (ctx.dry) {70        output.applyDry(ctx.machine.name);71        const code = try exec.nixosRebuildDryActivate(ctx.io, &ctx.machine, ctx.gpa, ctx.passthrough);72        if (code != 0) return error.BuildFailed;73        output.applyDryDone();74        return;75    }76    if (ctx.check) {77        return check(ctx);78    }7980    if (!try runPreHook(ctx, "pre-apply")) {81        output.aborted();82        return error.HookAborted;83    }8485    output.applyStart(ctx.machine.name);86    output.buildPanelInit();87    const start = std.Io.Clock.awake.now(ctx.io);8889    var panel = output.BuildPanel{};90    const code = exec.nixosRebuildSwitchWithPanel(ctx.io, &ctx.machine, ctx.gpa, &panel, ctx.passthrough) catch |e| {91        output.buildPanelClear();92        exec.markApplyFailed(ctx.io, ctx.environ);93        return e;94    };95    output.buildPanelClear();9697    if (code != 0) {98        exec.markApplyFailed(ctx.io, ctx.environ);99        return error.BuildFailed;100    }101102    const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());103    const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));104    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine) catch 0;105    const after_failure = exec.takeApplyFailed(ctx.io, ctx.environ);106    output.applyDone(gen, elapsed, after_failure);107    // Show any nix warnings collected during the build (dim yellow, after success line).108    const warnings = errors.extractWarnings(ctx.gpa, errors.getBuildStderr()) catch &.{};109    defer {110        for (warnings) |w| ctx.gpa.free(w);111        ctx.gpa.free(warnings);112    }113    if (warnings.len > 0) output.buildWarnings(warnings);114    runPostHook(ctx, "post-apply");115    logAction(ctx, "apply", gen);116}117118pub fn check(ctx: Ctx) !void {119    output.checkStart(ctx.machine.name);120    const code = try exec.nixosRebuildBuild(ctx.io, &ctx.machine, ctx.gpa, ctx.passthrough);121    if (code != 0) return error.BuildFailed;122    output.checkOk();123}124125pub fn back(ctx: Ctx) !void {126    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);127    defer ctx.gpa.free(gens);128129    var current: u32 = 0;130    for (gens) |g| if (g.current) {131        current = g.number;132    };133134    // Newest generation older than current. If there is none, we're already at the135    // oldest — stop cleanly instead of letting rollback fail with 'build failed'.136    var prev: u32 = 0;137    var has_prev = false;138    for (gens) |g| {139        if (g.number < current and (!has_prev or g.number > prev)) {140            prev = g.number;141            has_prev = true;142        }143    }144    if (!has_prev) {145        output.alreadyOldest();146        return;147    }148149    if (!try runPreHook(ctx, "pre-back")) {150        output.aborted();151        return error.HookAborted;152    }153154    output.backStart(ctx.machine.name, current, prev);155    if (ctx.cfg.confirm and !output.confirm("")) return;156157    // Flake systems don't have <nixos-config> in the Nix search path, so158    // `nixos-rebuild --rollback` fails. Switch by generation number instead159    // (same path as `nina go N`), which works for both channel and flake.160    const code = if (flakeSystem(ctx))161        try exec.switchGeneration(ctx.io, &ctx.machine, ctx.gpa, prev)162    else163        try exec.rollback(ctx.io, &ctx.machine, ctx.gpa);164    if (code != 0) return error.BuildFailed;165    output.backDone(prev);166    runPostHook(ctx, "post-back");167}168169pub fn go(ctx: Ctx) !void {170    if (ctx.args.len == 0) return error.Internal;171    const target = std.fmt.parseInt(u32, ctx.args[0], 10) catch return error.Internal;172    const current = try exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine);173174    output.goStart(ctx.machine.name, current, target);175    if (ctx.cfg.confirm and !output.confirm("")) return;176177    const code = try exec.switchGeneration(ctx.io, &ctx.machine, ctx.gpa, target);178    if (code != 0) return error.ProcessFailed;179    output.generationDone(target);180}181182pub fn history(ctx: Ctx) !void {183    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);184    defer ctx.gpa.free(gens);185    output.historyHeader(ctx.machine.name);186    for (gens) |g| output.historyRow(g);187}188189const gen_help = [_][2][]const u8{190    .{ "list", "list generations" },191    .{ "current", "show current generation" },192    .{ "delete <n>", "delete generation n" },193    .{ "delete old", "delete old generations" },194};195196pub fn genCmd(ctx: Ctx) !void {197    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("gen", &gen_help, null);198    if (std.mem.eql(u8, ctx.sub, "list")) return history(ctx);199    if (std.mem.eql(u8, ctx.sub, "current")) {200        const n = try exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine);201        output.genCurrent(n);202        return;203    }204    if (std.mem.eql(u8, ctx.sub, "delete")) {205        if (ctx.args.len == 0) return error.Internal;206        if (std.mem.eql(u8, ctx.args[0], "old")) {207            if (ctx.cfg.confirm and !output.confirm("")) return;208            _ = try exec.deleteOldGenerations(ctx.io, &ctx.machine, ctx.gpa);209        } else {210            const n = std.fmt.parseInt(u32, ctx.args[0], 10) catch return error.Internal;211            if (ctx.cfg.confirm and !output.confirm("")) return;212            _ = try exec.deleteGeneration(ctx.io, &ctx.machine, ctx.gpa, n);213        }214        output.done();215        return;216    }217    return error.Internal;218}219220pub fn clean(ctx: Ctx) !void {221    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);222    defer ctx.gpa.free(gens);223    const all = ctx.all or std.mem.eql(u8, ctx.sub, "all");224    const total: u32 = @intCast(gens.len);225    // `clean all` keeps only the current generation; otherwise keep the configured226    // count. With nothing older than the keep limit, there's nothing to collect.227    const keep: u32 = if (all) 1 else ctx.cfg.generations;228    if (total <= keep) {229        output.cleanNothing(ctx.machine.name, total);230        return;231    }232    output.cleanStart(ctx.machine.name, keep, total);233    if (ctx.cfg.confirm and !output.confirm("removing — cannot be undone")) return;234    _ = try exec.collectGarbage(ctx.io, &ctx.machine, ctx.gpa, all, ctx.cfg.generations);235    output.cleanDone();236}237238pub fn statusCmd(ctx: Ctx) !void {239    output.statusHeader();240    // --all renders every configured machine; remotes route through the same SSH241    // path as exec.capture. An unreachable machine is shown in red, not fatal.242    if (ctx.all and ctx.cfg.machines.len > 0) {243        for (ctx.cfg.machines) |m| statusRowFor(ctx, &m);244    } else {245        statusRowFor(ctx, &ctx.machine);246    }247    homeStatusLine(ctx);248}249250// When standalone Home Manager is present, show its current generation as a dim251// line indented under the machine rows. Gated on standalone mode (the only mode252// where we can read a generation), so a machine without HM is unaffected.253fn homeStatusLine(ctx: Ctx) void {254    if (exec.detectHomeManager(ctx.gpa, ctx.io, ctx.environ) != .standalone) return;255    const out = exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine) catch return;256    defer ctx.gpa.free(out);257    const gens = parseHomeGenerations(ctx.gpa, out) catch return;258    defer freeHomeGens(ctx.gpa, gens);259    if (gens.len == 0) return;260    output.statusHomeRow(gens[0].number, gens[0].date);261}262263fn statusRowFor(ctx: Ctx, machine: *const types.Machine) void {264    // A failure to read the current generation means we couldn't reach or query265    // the machine — mark it unreachable rather than reporting a bogus gen 0.266    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, machine) catch {267        output.statusRow(machine.name, 0, "", "", false);268        return;269    };270    const st = exec.systemStatus(ctx.gpa, ctx.io, machine);271    defer ctx.gpa.free(st.size);272    defer ctx.gpa.free(st.age);273    output.statusRow(machine.name, gen, st.age, st.size, true);274}275276// Pure decision for `nina diff`'s generation targets, split out so it can be277// unit tested without shelling out. Returns null when there's nothing safe to278// diff — no generation is marked current (a non-standard profile layout, a279// transient readlink failure, or a non-GNU remote host can all produce this)280// or fewer than two generations exist and no explicit pair was given. Nina281// ships ReleaseSafe, so leaving `current - 1` reachable with current == 0282// would be a u32 underflow panic, not silent wraparound.283fn diffTargets(gens: []const types.GenerationInfo, args: []const []const u8) ?struct { a: u32, b: u32 } {284    var current: u32 = 0;285    var prev: u32 = 0;286    for (gens) |g| {287        if (g.current) current = g.number;288        if (!g.current and g.number > prev and g.number < current) prev = g.number;289    }290    if (args.len >= 2) {291        const a = std.fmt.parseInt(u32, args[0], 10) catch blk: {292            if (current == 0) return null;293            break :blk current - 1;294        };295        const b = std.fmt.parseInt(u32, args[1], 10) catch blk: {296            if (current == 0) return null;297            break :blk current;298        };299        return .{ .a = a, .b = b };300    }301    if (current == 0 or gens.len < 2) return null;302    return .{ .a = if (prev > 0) prev else current - 1, .b = current };303}304305pub fn diff(ctx: Ctx) !void {306    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);307    defer ctx.gpa.free(gens);308    const targets = diffTargets(gens, ctx.args) orelse {309        output.diffCannotDetermine();310        return;311    };312    output.diffHeader(targets.a, targets.b, ctx.machine.name);313    if (try exec.diffClosures(ctx.io, &ctx.machine, ctx.gpa, targets.a, targets.b) != 0) return error.ProcessFailed;314}315316test "diffTargets returns null when no generation is marked current" {317    const gens = [_]types.GenerationInfo{318        .{ .number = 1, .date = "", .time = "", .current = false },319        .{ .number = 2, .date = "", .time = "", .current = false },320    };321    try std.testing.expect(diffTargets(&gens, &.{}) == null);322}323324test "diffTargets returns null with fewer than two generations and no explicit args" {325    const gens = [_]types.GenerationInfo{326        .{ .number = 1, .date = "", .time = "", .current = true },327    };328    try std.testing.expect(diffTargets(&gens, &.{}) == null);329}330331test "diffTargets falls back to prev/current when both are known" {332    const gens = [_]types.GenerationInfo{333        .{ .number = 1, .date = "", .time = "", .current = false },334        .{ .number = 2, .date = "", .time = "", .current = true },335    };336    const targets = diffTargets(&gens, &.{}).?;337    try std.testing.expectEqual(@as(u32, 1), targets.a);338    try std.testing.expectEqual(@as(u32, 2), targets.b);339}340341test "diffTargets returns null when explicit args fail to parse and no current generation exists" {342    const gens = [_]types.GenerationInfo{343        .{ .number = 1, .date = "", .time = "", .current = false },344    };345    try std.testing.expect(diffTargets(&gens, &.{ "not-a-number", "2" }) == null);346}347348test "diffTargets uses explicit args verbatim when both parse" {349    const gens = [_]types.GenerationInfo{350        .{ .number = 1, .date = "", .time = "", .current = false },351    };352    const targets = diffTargets(&gens, &.{ "3", "5" }).?;353    try std.testing.expectEqual(@as(u32, 3), targets.a);354    try std.testing.expectEqual(@as(u32, 5), targets.b);355}356357pub fn mood(ctx: Ctx) !void {358    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine) catch 0;359    const st = exec.systemStatus(ctx.gpa, ctx.io, &ctx.machine);360    defer ctx.gpa.free(st.size);361    defer ctx.gpa.free(st.age);362    const state = exec.systemRunningState(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");363    defer ctx.gpa.free(state);364    output.mood(ctx.machine.name, state, gen, st.age, st.size);365}366367pub fn doctor(ctx: Ctx) !void {368    output.doctorHeader(ctx.machine.name);369    const checks = try exec.runDoctorChecks(ctx.gpa, ctx.io, &ctx.machine);370    defer ctx.gpa.free(checks);371    var warnings: u32 = 0;372    var failures: u32 = 0;373    for (checks) |ch| {374        output.doctorRow(ch);375        if (ch.status == .warn) warnings += 1;376        if (ch.status == .fail) failures += 1;377    }378379    // Home Manager row only when present — absent on a machine without HM, so380    // doctor's table is unchanged there.381    const hm_mode = exec.detectHomeManager(ctx.gpa, ctx.io, ctx.environ);382    if (hm_mode != .none) {383        const note = homeDoctorNote(ctx, hm_mode);384        defer ctx.gpa.free(note);385        output.doctorRow(.{ .name = "home manager", .status = .ok, .note = note });386    }387388    output.doctorSummary(warnings, failures);389}390391// "standalone  gen 765" / "module" — the note shown in doctor's home manager row.392// Caller owns the returned slice.393fn homeDoctorNote(ctx: Ctx, mode: exec.HomeManagerMode) []const u8 {394    const label = switch (mode) {395        .standalone => "standalone",396        .module => "module",397        .none => "",398    };399    if (mode == .standalone) {400        const gen = homeCurrentGen(ctx);401        if (gen != 0)402            return std.fmt.allocPrint(ctx.gpa, "{s}  gen {d}", .{ label, gen }) catch403                (ctx.gpa.dupe(u8, label) catch "");404    }405    return ctx.gpa.dupe(u8, label) catch "";406}407408// nina update — kepr self-update for the nina binary itself.409pub fn update(ctx: Ctx) !void {410    output.updateSelfStart();411412    if (comptime std.mem.eql(u8, version.PLATFORM, "unsupported")) {413        output.updateSelfNoPlatform(@tagName(builtin.cpu.arch) ++ "-" ++ @tagName(builtin.os.tag));414        return error.Internal;415    }416417    const env_url = ctx.environ.get("NINA_UPDATE_SOURCE");418    const source_url = env_url orelse UPDATE_URL;419420    const body = exec.fetchUrl(ctx.gpa, ctx.io, source_url) catch |e| switch (e) {421        error.NetworkError, error.HttpError => {422            output.updateSelfNetworkError();423            return;424        },425        else => return e,426    };427    defer ctx.gpa.free(body);428429    const parsed = std.json.parseFromSlice(std.json.Value, ctx.gpa, body, .{}) catch {430        output.printWarning("could not parse release metadata");431        return;432    };433    defer parsed.deinit();434435    const root = parsed.value;436    if (root != .object) {437        output.printWarning("malformed release metadata");438        return;439    }440441    const remote_ver = blk: {442        const v = root.object.get("version") orelse {443            output.printWarning("malformed release metadata");444            return;445        };446        break :blk switch (v) {447            .string => |s| s,448            else => {449                output.printWarning("malformed release metadata");450                return;451            },452        };453    };454    if (!remoteVersionNewer(version.VERSION, remote_ver)) {455        output.updateSelfCurrent(version.VERSION);456        return;457    }458459    const release_notes = try updateReleaseNotes(ctx.gpa, ctx.io, root, source_url, version.VERSION, remote_ver);460    defer ctx.gpa.free(release_notes);461462    output.updateSelfAvailable(version.VERSION, remote_ver);463    output.updateSelfReleaseNotes(release_notes);464    if (ctx.check) return;465466    var exe_buf: [std.Io.Dir.max_path_bytes]u8 = undefined;467    const install_path = exec.selfExePath(ctx.io, &exe_buf) catch {468        errors.error_info.setMessage("could not determine install path", .{});469        return error.Internal;470    };471472    // When running from the nix store, defer to nix profile upgrade so nix473    // manages the transition (the store is read-only; binary replacement fails).474    // A NixOS system install also resolves into the store but isn't a profile475    // element, so check the profile to avoid a no-op `upgrade` — it updates with476    // the next nixos-rebuild instead.477    if (std.mem.startsWith(u8, install_path, "/nix/store/")) {478        const nina_element = exec.profileNinaElement(ctx.gpa, ctx.io, &ctx.machine);479        defer if (nina_element) |n| ctx.gpa.free(n);480        if (nina_element == null) {481            output.updateSelfSystemManaged();482            return;483        }484        const element = nina_element.?;485        output.updateSelfNixManaged(remote_ver);486        if (ctx.cfg.confirm and !output.confirm("")) return;487        // Build the new version into the store BEFORE touching the profile. A488        // network drop or eval failure here leaves the old element untouched —489        // this is the only step that can fail for reasons outside our control,490        // so it must happen first. Once this succeeds, the subsequent491        // remove+add operates on an already-warm local store and is not492        // expected to fail for the same reasons, closing the window a raw493        // remove-then-add would leave open between the two profile edits.494        const prefetch_r = exec.capture(ctx.gpa, ctx.io, &ctx.machine, &.{ "nix", "build", "--no-link", "--refresh", FLAKE_URL }) catch {495            output.updateSelfNixPrefetchFailed();496            return;497        };498        defer ctx.gpa.free(prefetch_r.stdout);499        defer ctx.gpa.free(prefetch_r.stderr);500        if (prefetch_r.exit_code != 0) {501            output.raw(prefetch_r.stdout);502            output.raw(prefetch_r.stderr);503            output.updateSelfNixPrefetchFailed();504            return;505        }506        // `nix profile upgrade` re-resolves the element's own originalUrl. The507        // archive install runs with --no-write-lock-file, so nix has nowhere to508        // persist the lock it takes at install time except baking it into that509        // originalUrl as a `?narHash=` pin — which then never changes no matter510        // how far kepr's HEAD moves. Upgrading against that pin is a permanent511        // no-op: exit 0, "upgrading from X to X", nothing installed. Remove and512        // re-add against the plain (unpinned) archive URL instead, so nix513        // actually re-resolves HEAD and picks up a fresh narHash.514        const remove_r = exec.capture(ctx.gpa, ctx.io, &ctx.machine, &.{ "nix", "profile", "remove", element }) catch {515            output.updateSelfNixFailed();516            return;517        };518        defer ctx.gpa.free(remove_r.stdout);519        defer ctx.gpa.free(remove_r.stderr);520        if (remove_r.exit_code != 0) {521            output.raw(remove_r.stdout);522            output.raw(remove_r.stderr);523            output.updateSelfNixFailed();524            return;525        }526        // Even against the plain unpinned URL, nix caches its resolution for527        // `tarball-ttl` seconds (default 3600) regardless of HTTP cache-control528        // headers — so within an hour of any prior nix operation touching this529        // URL, add would silently reuse the stale narHash and reinstall the530        // same old version. --refresh forces nix to actually re-check HEAD.531        const add_r = exec.capture(ctx.gpa, ctx.io, &ctx.machine, &.{ "nix", "profile", "add", "--no-write-lock-file", "--refresh", FLAKE_URL }) catch {532            output.updateSelfNixReinstallFailed();533            return;534        };535        defer ctx.gpa.free(add_r.stdout);536        defer ctx.gpa.free(add_r.stderr);537        if (add_r.exit_code != 0) {538            output.raw(add_r.stdout);539            output.raw(add_r.stderr);540            output.updateSelfNixReinstallFailed();541            return;542        }543        output.updateSelfDone(version.VERSION, remote_ver);544        output.updateSelfNixRehash();545        return;546    }547548    const plat_info = blk: {549        const pv = root.object.get("platforms") orelse break :blk null;550        if (pv != .object) break :blk null;551        break :blk pv.object.get(version.PLATFORM);552    };553    if (plat_info == null) {554        output.updateSelfNoPlatform(version.PLATFORM);555        return;556    }557558    const dl_url = blk: {559        const v = plat_info.?.object.get("url") orelse {560            output.printWarning("malformed release metadata");561            return;562        };563        break :blk switch (v) {564            .string => |s| s,565            else => {566                output.printWarning("malformed release metadata");567                return;568            },569        };570    };571572    const raw_cksum = blk: {573        if (plat_info.?.object.get("blake3")) |v|574            break :blk switch (v) {575                .string => |s| s,576                else => {577                    output.printWarning("malformed release metadata");578                    return;579                },580            };581        if (plat_info.?.object.get("checksum")) |v|582            break :blk switch (v) {583                .string => |s| s,584                else => {585                    output.printWarning("malformed release metadata");586                    return;587                },588            };589        output.printWarning("missing checksum in release metadata");590        return;591    };592    const expected_hex = if (std.mem.startsWith(u8, raw_cksum, "blake3:")) raw_cksum["blake3:".len..] else raw_cksum;593594    if (ctx.cfg.confirm and !output.confirm("")) return;595596    output.updateSelfDownloading(remote_ver, version.PLATFORM);597    const tmp_path = exec.downloadToTemp(ctx.gpa, ctx.io, dl_url) catch {598        output.printWarning("download failed — check your connection and try again");599        return;600    };601    defer ctx.gpa.free(tmp_path);602    // Clean up the downloaded temp file whether install succeeds or fails —603    // it's only ever a scratch copy verified against the release checksum.604    defer std.Io.Dir.deleteFileAbsolute(ctx.io, tmp_path) catch {};605606    output.updateSelfVerifying();607    exec.verifyAndInstall(ctx.gpa, ctx.io, tmp_path, expected_hex, install_path) catch |e| switch (e) {608        error.ChecksumMismatch => {609            output.updateSelfChecksumFailed();610            return;611        },612        else => return e,613    };614615    output.updateSelfDone(version.VERSION, remote_ver);616}617618// archives.json covers every version between current and latest; the manifest's619// `notes` field only ever describes the single latest release. Try the full-range620// changelog first so an update spanning several versions doesn't collapse down to621// just the newest one's notes — fall back to `notes` only when the archive has622// nothing (e.g. releases predating archives.json, or the fetch failing).623fn updateReleaseNotes(gpa: std.mem.Allocator, io: std.Io, root: std.json.Value, source_url: []const u8, current: []const u8, latest: []const u8) ![]u8 {624    if (buildKeprArchiveReleaseNotes(gpa, io, source_url, current, latest) catch null) |notes| {625        if (std.mem.trim(u8, notes, " \t\r\n").len > 0) return notes;626        gpa.free(notes);627    }628    if (releaseNotesFromMetadata(gpa, root)) |notes| return notes;629    return gpa.dupe(u8, "");630}631632fn releaseNotesFromMetadata(gpa: std.mem.Allocator, root: std.json.Value) ?[]u8 {633    if (root != .object) return null;634    // `notes` is the one canonical manifest field. The retired `release_notes`635    // and `changelog` fallbacks are gone — Kepr now emits `notes` everywhere, and636    // releases that predate `--notes` fall back to archives.json in the caller.637    const v = root.object.get("notes") orelse return null;638    return switch (v) {639        .string => |s| gpa.dupe(u8, s) catch null,640        else => null,641    };642}643644fn buildKeprArchiveReleaseNotes(gpa: std.mem.Allocator, io: std.Io, source_url: []const u8, current: []const u8, latest: []const u8) ![]u8 {645    const archive_url = try keprArchiveUrl(gpa, source_url);646    defer gpa.free(archive_url);647648    const body = exec.fetchUrl(gpa, io, archive_url) catch return gpa.dupe(u8, "");649    defer gpa.free(body);650651    return releaseNotesFromArchiveJson(gpa, body, current, latest);652}653654fn keprArchiveUrl(gpa: std.mem.Allocator, source_url: []const u8) ![]u8 {655    const scheme = std.mem.indexOf(u8, source_url, "://") orelse return error.InvalidUpdateSource;656    const path_start = std.mem.indexOfScalarPos(u8, source_url, scheme + 3, '/') orelse return error.InvalidUpdateSource;657    const origin = source_url[0..path_start];658    const path = source_url[path_start..];659    if (!std.mem.startsWith(u8, path, "/api/")) return error.InvalidUpdateSource;660661    const after_api = path["/api/".len..];662    const repo_end = std.mem.indexOfScalar(u8, after_api, '/') orelse return error.InvalidUpdateSource;663    const repo = after_api[0..repo_end];664    if (repo.len == 0) return error.InvalidUpdateSource;665666    return std.fmt.allocPrint(gpa, "{s}/{s}/archives.json?limit=100", .{ origin, repo });667}668669// Saves arrive newest-first. For each version in the update range we want the OLDEST670// save message (the one that introduced that version), not a follow-up cleanup/docs save.671// We overwrite the tracked message on each occurrence, so the final stored value per672// version is always the oldest (last-seen in a newest-first stream).673fn releaseNotesFromArchiveJson(gpa: std.mem.Allocator, body: []const u8, current: []const u8, latest: []const u8) ![]u8 {674    const parsed = std.json.parseFromSlice(std.json.Value, gpa, body, .{}) catch return gpa.dupe(u8, "");675    defer parsed.deinit();676677    if (parsed.value != .object) return gpa.dupe(u8, "");678    const saves_v = parsed.value.object.get("saves") orelse return gpa.dupe(u8, "");679    if (saves_v != .array) return gpa.dupe(u8, "");680681    // version string → oldest message seen (both slice into parsed JSON, valid until deinit)682    var best_msg = std.StringHashMap([]const u8).init(gpa);683    defer best_msg.deinit();684    var order: std.ArrayList([]const u8) = .empty;685    defer order.deinit(gpa);686687    for (saves_v.array.items) |save| {688        if (save != .object) continue;689        const ver_v = save.object.get("version") orelse continue;690        const msg_v = save.object.get("message") orelse continue;691        if (ver_v != .string or msg_v != .string) continue;692        const ver = ver_v.string;693        const msg = std.mem.trim(u8, msg_v.string, " \t\r\n");694        if (msg.len == 0 or !versionInUpdateRange(ver, current, latest)) continue;695696        const entry = try best_msg.getOrPut(ver);697        if (!entry.found_existing) try order.append(gpa, ver);698        // Always overwrite: saves are newest-first, so last write = oldest save = version-intro message699        entry.value_ptr.* = msg;700    }701702    if (order.items.len == 0) return gpa.dupe(u8, "");703704    var out: std.ArrayList(u8) = .empty;705    errdefer out.deinit(gpa);706    for (order.items) |ver| {707        const msg = best_msg.get(ver).?;708        // Use only the first line as the summary; multi-line saves may have implementation details below709        const summary_end = std.mem.indexOf(u8, msg, "\n") orelse msg.len;710        const summary = std.mem.trim(u8, msg[0..summary_end], " \t\r");711        if (summary.len == 0) continue;712        try appendLine(&out, gpa, "## {s}\n", .{ver});713        try appendLine(&out, gpa, "- {s}\n\n", .{summary});714    }715716    if (out.items.len == 0) {717        out.deinit(gpa);718        return gpa.dupe(u8, "");719    }720    return out.toOwnedSlice(gpa);721}722723fn appendLine(out: *std.ArrayList(u8), gpa: std.mem.Allocator, comptime template: []const u8, args: anytype) !void {724    const line = try std.fmt.allocPrint(gpa, template, args);725    defer gpa.free(line);726    try out.appendSlice(gpa, line);727}728729fn versionInUpdateRange(candidate: []const u8, current: []const u8, latest: []const u8) bool {730    const cand = parseSemver(candidate) orelse return std.mem.eql(u8, candidate, latest);731    const cur = parseSemver(current) orelse return std.mem.eql(u8, candidate, latest);732    const lat = parseSemver(latest) orelse return std.mem.eql(u8, candidate, latest);733    return compareSemver(cand, cur) == .gt and compareSemver(cand, lat) != .gt;734}735736fn remoteVersionNewer(current: []const u8, remote: []const u8) bool {737    const cur = parseSemver(current) orelse return !std.mem.eql(u8, current, remote);738    const rem = parseSemver(remote) orelse return !std.mem.eql(u8, current, remote);739    return compareSemver(rem, cur) == .gt;740}741742const VersionOrder = enum { lt, eq, gt };743744fn compareSemver(a: Semver, b: Semver) VersionOrder {745    if (a.major != b.major) return if (a.major < b.major) .lt else .gt;746    if (a.minor != b.minor) return if (a.minor < b.minor) .lt else .gt;747    if (a.patch != b.patch) return if (a.patch < b.patch) .lt else .gt;748    return .eq;749}750751fn parseSemver(raw: []const u8) ?Semver {752    const v = if (std.mem.startsWith(u8, raw, "v")) raw[1..] else raw;753    var it = std.mem.splitScalar(u8, v, '.');754    const major_s = it.next() orelse return null;755    const minor_s = it.next() orelse return null;756    const patch_s = it.next() orelse return null;757    if (it.next() != null) return null;758    return .{759        .major = std.fmt.parseInt(u32, major_s, 10) catch return null,760        .minor = std.fmt.parseInt(u32, minor_s, 10) catch return null,761        .patch = std.fmt.parseInt(u32, patch_s, 10) catch return null,762    };763}764765test "versionInUpdateRange includes only newer versions through latest" {766    try std.testing.expect(versionInUpdateRange("3.2.3", "3.1.9", "3.2.3"));767    try std.testing.expect(versionInUpdateRange("3.2.0", "3.1.9", "3.2.3"));768    try std.testing.expect(!versionInUpdateRange("3.1.9", "3.1.9", "3.2.3"));769    try std.testing.expect(!versionInUpdateRange("3.2.4", "3.1.9", "3.2.3"));770}771772test "remoteVersionNewer does not offer downgrades" {773    try std.testing.expect(remoteVersionNewer("3.2.3", "3.2.4"));774    try std.testing.expect(!remoteVersionNewer("3.2.4", "3.2.3"));775    try std.testing.expect(!remoteVersionNewer("3.2.4", "3.2.4"));776}777778test "releaseNotesFromArchiveJson uses oldest save per version" {779    // Saves arrive newest-first. For 3.2.3, the newest save is a CONTINUITY update;780    // the oldest is the version-intro message. We expect the intro message in the output.781    const body =782        \\{783        \\  "saves": [784        \\    {"version":"3.2.3","message":"wip: record verification in CONTINUITY"},785        \\    {"version":"3.2.1","message":"old release"},786        \\    {"version":"3.2.3","message":"add streaming deflate path"}787        \\  ]788        \\}789    ;790    const notes = try releaseNotesFromArchiveJson(std.testing.allocator, body, "3.2.1", "3.2.3");791    defer std.testing.allocator.free(notes);792793    try std.testing.expect(std.mem.indexOf(u8, notes, "## 3.2.3") != null);794    try std.testing.expect(std.mem.indexOf(u8, notes, "- add streaming deflate path") != null);795    try std.testing.expect(std.mem.indexOf(u8, notes, "CONTINUITY") == null);796    try std.testing.expect(std.mem.indexOf(u8, notes, "old release") == null);797}798799test "releaseNotesFromMetadata reads canonical notes and ignores retired keys" {800    const a = std.testing.allocator;801802    // Canonical field is read.803    {804        var parsed = try std.json.parseFromSlice(std.json.Value, a, "{\"notes\":\"colored progress bar\"}", .{});805        defer parsed.deinit();806        const got = releaseNotesFromMetadata(a, parsed.value).?;807        defer a.free(got);808        try std.testing.expectEqualStrings("colored progress bar", got);809    }810811    // Retired field names are no longer honoured — they fall through to null so812    // the caller drops to the archives.json derivation instead.813    {814        var parsed = try std.json.parseFromSlice(std.json.Value, a, "{\"release_notes\":\"x\",\"changelog\":\"y\"}", .{});815        defer parsed.deinit();816        try std.testing.expect(releaseNotesFromMetadata(a, parsed.value) == null);817    }818}819820// nina goodbye — clean uninstall. Three install paths:821// - nix profile (binary in nix store with a profile element) → nix profile remove822// - koh build or source build (plain binary on PATH) → delete the file823pub fn goodbye(ctx: Ctx) !void {824    output.goodbyeStart();825826    var exe_buf: [std.Io.Dir.max_path_bytes]u8 = undefined;827    const install_path = exec.selfExePath(ctx.io, &exe_buf) catch {828        errors.error_info.setMessage("could not determine install path", .{});829        return error.Internal;830    };831832    // A binary outside the nix store is a koh build or source build — delete it.833    if (!std.mem.startsWith(u8, install_path, "/nix/store/")) {834        output.goodbyeFile(install_path);835        if (ctx.cfg.confirm and !output.confirm("")) return;836        std.Io.Dir.deleteFileAbsolute(ctx.io, install_path) catch |e| {837            errors.error_info.setMessage("could not remove {s}", .{install_path});838            return e;839        };840        output.goodbyeDone();841        return;842    }843844    // Binary is in the nix store — find and remove the profile element.845    const nina_element = exec.profileNinaElement(ctx.gpa, ctx.io, &ctx.machine);846    defer {847        if (nina_element) |n| ctx.gpa.free(n);848    }849850    if (nina_element == null) {851        errors.error_info.setMessage("nina not found in nix profile — was it installed via 'nix profile add'?", .{});852        return error.Internal;853    }854855    output.goodbyeNix();856    if (ctx.cfg.confirm and !output.confirm("")) return;857    const ec = exec.streamLocal(ctx.io, &.{ "nix", "profile", "remove", nina_element.? }) catch {858        output.goodbyeFailed("nix profile remove failed");859        return;860    };861    if (ec != 0) {862        output.goodbyeFailed("nix profile remove failed");863        return;864    }865    output.goodbyeDone();866}867868fn channelUpdateCmd(ctx: Ctx) !void {869    output.updateStart(ctx.machine.name);870    _ = try exec.channelUpdate(ctx.io, &ctx.machine, ctx.gpa);871    output.updateDone();872}873874pub fn upgrade(ctx: Ctx) !void {875    if (!try runPreHook(ctx, "pre-upgrade")) {876        output.aborted();877        return error.HookAborted;878    }879880    output.upgradeStart(ctx.machine.name);881    // Flake systems update inputs (flake.lock); channel systems update channels.882    // Running nix-channel --update on a flake system is a no-op at best. The883    // rebuild below is already flake-aware via exec.nixosRebuildSwitch.884    if (flakeSystem(ctx)) {885        output.printSubstep("updating flake inputs", .{});886        _ = exec.flakeUpdateAt(ctx.io, &ctx.machine, ctx.gpa, ctx.machine.config_path) catch {};887    } else {888        output.printSubstep("updating channels", .{});889        _ = exec.channelUpdate(ctx.io, &ctx.machine, ctx.gpa) catch {};890    }891    output.printSubstep("rebuilding", .{});892    output.buildPanelInit();893    const start = std.Io.Clock.awake.now(ctx.io);894    var panel = output.BuildPanel{};895    const code = exec.nixosRebuildSwitchWithPanel(ctx.io, &ctx.machine, ctx.gpa, &panel, ctx.passthrough) catch |e| {896        output.buildPanelClear();897        return e;898    };899    output.buildPanelClear();900    if (code != 0) {901        output.applyFailed("");902        return error.BuildFailed;903    }904    const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());905    const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));906    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine) catch 0;907    output.applyDone(gen, elapsed, false);908    runPostHook(ctx, "post-upgrade");909}910911pub fn log(ctx: Ctx) !void {912    output.logHeader(ctx.machine.name);913    const content = exec.readNinaLog(ctx.gpa, ctx.io, ctx.environ, ctx.last) catch {914        // No log yet — that's fine915        return;916    };917    defer ctx.gpa.free(content);918    var lines = std.mem.splitScalar(u8, content, '\n');919    while (lines.next()) |line| {920        const t = std.mem.trim(u8, line, " \t\r");921        if (t.len == 0) continue;922        if (t[0] == '{') {923            renderJsonLogLine(ctx.gpa, t);924        } else {925            // legacy tab-separated format926            var parts = std.mem.tokenizeScalar(u8, t, '\t');927            const date = parts.next() orelse continue;928            const time = parts.next() orelse "";929            const action = parts.next() orelse "";930            const detail = parts.next() orelse "";931            output.logRow(date, time, action, detail);932        }933    }934}935936// The on-disk log is JSON Lines: {"ts","machine","command","outcome","gen_after",...}.937// Render ts -> date/time columns, command -> action, outcome(+gen) -> detail.938fn renderJsonLogLine(gpa: std.mem.Allocator, line: []const u8) void {939    const parsed = std.json.parseFromSlice(std.json.Value, gpa, line, .{}) catch {940        output.logRow(line, "", "", ""); // unparseable — show raw rather than drop941        return;942    };943    defer parsed.deinit();944    if (parsed.value != .object) return;945    const o = parsed.value.object;946947    const ts = jsonStr(o, "ts");948    const date = if (ts.len >= 10) ts[0..10] else ts;949    const time = if (ts.len >= 16) ts[11..16] else "";950    const action = jsonStr(o, "command");951    const outcome = jsonStr(o, "outcome");952953    var buf: [160]u8 = undefined;954    var detail: []const u8 = outcome;955    if (o.get("gen_after")) |g| {956        if (g == .integer) {957            detail = std.fmt.bufPrint(&buf, "{s}   -> gen {d}", .{ outcome, g.integer }) catch outcome;958        }959    }960    output.logRow(date, time, action, detail);961}962963fn jsonStr(o: std.json.ObjectMap, key: []const u8) []const u8 {964    if (o.get(key)) |v| {965        if (v == .string) return v.string;966    }967    return "";968}969970pub fn edit(ctx: Ctx) !void {971    // `edit` is multi-word, so a bare positional ("hardware") arrives as ctx.sub.972    // hardware-configuration.nix is generated by nixos-generate-config and warns973    // against hand-editing — refuse rather than silently opening the wrong file.974    if (std.mem.eql(u8, ctx.sub, "hardware")) {975        output.editHardwareWarning();976        return;977    }978979    // --dir opens the whole config directory (for editors that work better with980    // a folder open), as root so root-owned config trees like /etc/nixos work.981    var open_dir = false;982    for (ctx.args) |arg| {983        if (std.mem.eql(u8, arg, "--dir")) open_dir = true;984    }985    if (open_dir) {986        output.editOpen(ctx.machine.config_path, ctx.cfg.editor);987        _ = try exec.openEditorSudo(ctx.io, ctx.gpa, ctx.cfg.editor, ctx.machine.config_path);988        return;989    }990991    const path = try std.fmt.allocPrint(ctx.gpa, "{s}/configuration.nix", .{ctx.machine.config_path});992    defer ctx.gpa.free(path);993    output.editOpen(path, ctx.cfg.editor);994    _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, path, null);995}996997pub fn fmt(ctx: Ctx) !void {998    const path = try std.fmt.allocPrint(ctx.gpa, "{s}/configuration.nix", .{ctx.machine.config_path});999    defer ctx.gpa.free(path);1000    if (ctx.check) {1001        const code = try exec.nixpkgsFmt(ctx.io, &ctx.machine, ctx.gpa, path, true);1002        if (code != 0) output.fmtNeedsFormat() else output.fmtDone();1003        return;1004    }1005    output.fmtStart(path);1006    _ = try exec.nixpkgsFmt(ctx.io, &ctx.machine, ctx.gpa, path, false);1007    output.fmtDone();1008}10091010pub fn repl(ctx: Ctx) !void {1011    output.replStart();1012    _ = try exec.nixRepl(ctx.io, &ctx.machine, ctx.gpa);1013}10141015pub fn develop(ctx: Ctx) !void {1016    if (std.mem.eql(u8, ctx.sub, "show")) {1017        _ = try exec.nixBuild(ctx.io, &ctx.machine, ctx.gpa, null, ctx.passthrough);1018        return;1019    }1020    const run_cmd: ?[]const u8 = if (ctx.args.len > 0 and std.mem.eql(u8, ctx.sub, "run"))1021        ctx.args[0]1022    else1023        null;1024    output.developStart(&.{});1025    _ = try exec.nixDevelopPs1(ctx.io, &ctx.machine, ctx.gpa, run_cmd, ctx.environ, ctx.passthrough);1026    output.developDone();1027}10281029pub fn info(ctx: Ctx) !void {1030    output.infoHeader(ctx.machine.name);1031    const nixos_ver = exec.systemInfo(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");1032    defer ctx.gpa.free(nixos_ver);1033    output.infoRow("nixos", std.mem.trim(u8, nixos_ver, " \t\n\r"));10341035    const kernel = exec.kernelInfo(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");1036    defer ctx.gpa.free(kernel);1037    output.infoRow("kernel", std.mem.trim(u8, kernel, " \t\n\r"));10381039    const uptime = exec.uptimeInfo(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");1040    defer ctx.gpa.free(uptime);1041    output.infoRow("uptime", std.mem.trim(u8, uptime, " \t\n\r"));1042}10431044pub fn boot(ctx: Ctx) !void {1045    output.bootHeader(ctx.machine.name);1046    const entries = exec.bootEntries(ctx.gpa, ctx.io, &ctx.machine) catch &.{};1047    defer ctx.gpa.free(entries);1048    for (entries, 0..) |entry, i| output.bootEntry(entry, i);1049}10501051pub fn searchCmd(ctx: Ctx) !void {1052    const query = if (ctx.args.len > 0) ctx.args[0] else "";1053    api.ensureRegistryPinned(ctx.gpa, ctx.io, ctx.environ);1054    const selected = try search_tui.run(ctx.gpa, ctx.io, query, .packages, ctx.environ);1055    if (selected) |npkg| try selectAndInstall(ctx, npkg);1056}10571058pub fn optionCmd(ctx: Ctx) !void {1059    const query = if (ctx.args.len > 0) ctx.args[0] else "";1060    api.ensureRegistryPinned(ctx.gpa, ctx.io, ctx.environ);1061    _ = try search_tui.run(ctx.gpa, ctx.io, query, .options, ctx.environ);1062}10631064pub fn install(ctx: Ctx) !void {1065    const pkg_name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;10661067    api.ensureRegistryPinned(ctx.gpa, ctx.io, ctx.environ);10681069    // Search for the package to get the attr1070    const pkgs = api.searchPackages(ctx.gpa, ctx.io, ctx.environ, pkg_name) catch {1071        errors.error_info.setMessage("'{s}' not found in nixpkgs", .{pkg_name});1072        errors.error_info.setSuggestion("nina search {s}", .{pkg_name});1073        return error.PackageNotFound;1074    };10751076    if (pkgs.len == 0) {1077        // No matches — likely a typo. Suggest the closest real package and offer it.1078        if (closestPackage(ctx, pkg_name)) |sugg| {1079            output.didYouMean(pkg_name, sugg.pname);1080            if (output.confirm("")) try selectAndInstall(ctx, sugg);1081            return;1082        }1083        errors.error_info.setMessage("'{s}' not found in nixpkgs", .{pkg_name});1084        errors.error_info.setSuggestion("nina search {s}", .{pkg_name});1085        return error.PackageNotFound;1086    }10871088    // Prefer an exact name match over the first search result — `install ripgrep`1089    // must pick "ripgrep", not the alphabetically-first match like "repgrep".1090    var found = pkgs[0];1091    for (pkgs) |p| {1092        if (std.mem.eql(u8, p.pname, pkg_name)) {1093            found = p;1094            break;1095        }1096    }1097    try selectAndInstall(ctx, found);1098}10991100// Find the real package whose name is closest to a not-found query (typo help).1101// Typos usually keep the leading characters, so gather candidates with a prefix1102// search and rank by edit distance; return the best only if it's typo-close.1103fn closestPackage(ctx: Ctx, query: []const u8) ?types.NixPackage {1104    if (query.len < 2) return null;1105    var candidates = api.searchPackages(ctx.gpa, ctx.io, ctx.environ, query[0..@min(query.len, 4)]) catch &.{};1106    if (candidates.len == 0 and query.len > 2) {1107        candidates = api.searchPackages(ctx.gpa, ctx.io, ctx.environ, query[0..2]) catch &.{};1108    }1109    if (candidates.len == 0) return null;11101111    var best: ?types.NixPackage = null;1112    var best_dist: usize = std.math.maxInt(usize);1113    for (candidates) |p| {1114        const d = editDistance(query, p.pname);1115        if (d > 0 and d < best_dist) {1116            best_dist = d;1117            best = p;1118        }1119    }1120    // Only suggest a genuinely close name, scaled to query length.1121    const threshold = @max(@as(usize, 2), query.len / 3);1122    return if (best_dist <= threshold) best else null;1123}11241125// Case-insensitive Levenshtein distance. Names longer than the row buffer are1126// treated as far away (never suggested).1127fn editDistance(a: []const u8, b: []const u8) usize {1128    const n = b.len;1129    if (a.len == 0) return n;1130    if (n == 0) return a.len;1131    if (n + 1 > 128) return std.math.maxInt(usize);1132    var prev: [128]usize = undefined;1133    var curr: [128]usize = undefined;1134    var j: usize = 0;1135    while (j <= n) : (j += 1) prev[j] = j;1136    var i: usize = 1;1137    while (i <= a.len) : (i += 1) {1138        curr[0] = i;1139        j = 1;1140        while (j <= n) : (j += 1) {1141            const cost: usize = if (std.ascii.toLower(a[i - 1]) == std.ascii.toLower(b[j - 1])) 0 else 1;1142            curr[j] = @min(prev[j] + 1, @min(curr[j - 1] + 1, prev[j - 1] + cost));1143        }1144        @memcpy(prev[0 .. n + 1], curr[0 .. n + 1]);1145    }1146    return prev[n];1147}11481149test "editDistance is case-insensitive Levenshtein" {1150    try std.testing.expectEqual(@as(usize, 1), editDistance("firefux", "firefox"));1151    try std.testing.expectEqual(@as(usize, 0), editDistance("git", "GIT"));1152    try std.testing.expectEqual(@as(usize, 2), editDistance("fierfox", "firefox"));1153    try std.testing.expectEqual(@as(usize, 7), editDistance("", "firefox"));1154}11551156// Prompt for the install method (profile / system / try) and dispatch. Shared by1157// `nina install <pkg>` and the search widget's Enter-to-select — the letter keys1158// are read here, after the search widget's raw mode is gone, so they don't1159// collide with typing a query.1160fn selectAndInstall(ctx: Ctx, npkg: types.NixPackage) !void {1161    output.installSelectPrompt(npkg.pname, npkg.version);11621163    var choice_buf: [8]u8 = undefined;1164    var choice_len: usize = 0;1165    while (choice_len < choice_buf.len) {1166        const n = std.posix.read(std.posix.STDIN_FILENO, choice_buf[choice_len .. choice_len + 1]) catch break;1167        if (n == 0) break;1168        if (choice_buf[choice_len] == '\n') break;1169        choice_len += 1;1170    }1171    const choice = std.mem.trim(u8, choice_buf[0..choice_len], " \t");11721173    if (choice.len == 0 or choice[0] == 'i' or choice[0] == 'I') {1174        try profileInstallPkg(ctx, npkg);1175    } else if (choice[0] == 's' or choice[0] == 'S') {1176        try systemInstallPkg(ctx, npkg);1177    } else if (choice[0] == 't' or choice[0] == 'T') {1178        try tryPkg(ctx, npkg);1179    }1180}11811182fn profileInstallPkg(ctx: Ctx, npkg: types.NixPackage) !void {1183    output.installStart(npkg.pname, .profile);1184    if (npkg.unfree) {1185        output.printSubstep("NIXPKGS_ALLOW_UNFREE=1 nix profile add --impure nixpkgs#{s}", .{npkg.attr});1186        output.printTeach(try std.fmt.allocPrint(ctx.gpa, "NIXPKGS_ALLOW_UNFREE=1 nix profile add --impure nixpkgs#{s}", .{npkg.attr}));1187    } else {1188        output.printSubstep("nix profile add nixpkgs#{s}", .{npkg.attr});1189        output.printTeach(try std.fmt.allocPrint(ctx.gpa, "nix profile add nixpkgs#{s}", .{npkg.attr}));1190    }1191    const code = try exec.profileInstall(ctx.io, &ctx.machine, ctx.gpa, ctx.environ, npkg.attr, npkg.unfree);1192    if (code != 0) return error.ProcessFailed;1193    output.installDone(npkg.pname);1194}11951196fn systemInstallPkg(ctx: Ctx, npkg: types.NixPackage) !void {1197    const config_path = try std.fmt.allocPrint(ctx.gpa, "{s}/configuration.nix", .{ctx.machine.config_path});1198    defer ctx.gpa.free(config_path);1199    const line = api.findSystemPackagesLine(ctx.io, config_path) orelse 1;1200    output.installEditorPrompt(npkg.pname, config_path, line, ctx.cfg.editor);1201    _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, config_path, line);1202    if (ctx.cfg.confirm) {1203        if (output.confirm("apply now? ")) {1204            try apply(ctx);1205        }1206    }1207}12081209fn tryPkg(ctx: Ctx, npkg: types.NixPackage) !void {1210    output.tryStart(npkg.pname);1211    output.printSubstep("nix shell nixpkgs#{s}", .{npkg.attr});1212    output.tryExitHint();1213    _ = try exec.nixShellPs1(ctx.io, &ctx.machine, ctx.gpa, npkg.attr, ctx.environ);1214    output.tryDone();1215}12161217pub fn remove(ctx: Ctx) !void {1218    const pkg_name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1219    output.removeStart(pkg_name);1220    const code = try exec.profileRemove(ctx.io, &ctx.machine, ctx.gpa, pkg_name);1221    if (code != 0) return error.ProcessFailed;1222    output.done();1223}12241225pub fn list(ctx: Ctx) !void {1226    output.listHeader(ctx.machine.name);12271228    // Profile packages: parse `nix profile list --json` into clean name+version1229    // rows instead of dumping nix's verbose multi-line "Name:/Flake attribute:"1230    // blocks.1231    if (exec.profileListJson(ctx.gpa, ctx.io, &ctx.machine) catch null) |json| {1232        defer ctx.gpa.free(json);1233        output.listSection("profile");1234        renderProfileJson(ctx.gpa, json);1235    }12361237    // System packages: the references of /run/current-system/sw, each a1238    // <hash>-<name>-<version> store path.1239    if (exec.systemPackagePaths(ctx.gpa, ctx.io, &ctx.machine) catch null) |paths| {1240        defer ctx.gpa.free(paths);1241        output.blankLine();1242        output.listSection("system");1243        var lines = std.mem.splitScalar(u8, paths, '\n');1244        while (lines.next()) |line| {1245            const t = std.mem.trim(u8, line, " \t\r");1246            if (t.len == 0) continue;1247            const row = pkgFromStorePath(t);1248            // Skip support paths with no parseable version (man pages, wrappers).1249            if (row.version.len == 0) continue;1250            output.listPkg(row.name, row.version);1251        }1252    }1253}12541255const PkgRow = struct { name: []const u8, version: []const u8 };12561257// Split a nix store path basename (<hash>-<name>-<version>) into name + version.1258// Version begins at the first '-' followed by a digit, which reliably lands on1259// the name/version boundary since the 32-char hash and package names start with1260// non-digits.1261fn pkgFromStorePath(path: []const u8) PkgRow {1262    const base = std.fs.path.basename(path);1263    const after_hash = if (base.len > 33 and base[32] == '-') base[33..] else base;1264    var i: usize = 0;1265    while (i + 1 < after_hash.len) : (i += 1) {1266        if (after_hash[i] == '-' and std.ascii.isDigit(after_hash[i + 1])) {1267            return .{ .name = after_hash[0..i], .version = stripOutputSuffix(after_hash[i + 1 ..]) };1268        }1269    }1270    return .{ .name = after_hash, .version = "" };1271}12721273// Multi-output derivations append the output name to the store path (e.g.1274// curl-8.20.0-bin, less-692-man). Strip that suffix so the version column reads1275// as just the version.1276fn stripOutputSuffix(ver: []const u8) []const u8 {1277    const suffixes = [_][]const u8{ "-bin", "-man", "-dev", "-doc", "-lib", "-info", "-out", "-static", "-devdoc" };1278    for (suffixes) |s| {1279        if (std.mem.endsWith(u8, ver, s)) return ver[0 .. ver.len - s.len];1280    }1281    return ver;1282}12831284test "pkgFromStorePath splits name and version at first dash-digit" {1285    const a = pkgFromStorePath("/nix/store/abcdefghijklmnopqrstuvwxyz012345-ripgrep-15.1.0");1286    try std.testing.expectEqualStrings("ripgrep", a.name);1287    try std.testing.expectEqualStrings("15.1.0", a.version);12881289    const b = pkgFromStorePath("/nix/store/abcdefghijklmnopqrstuvwxyz012345-helix-25.01");1290    try std.testing.expectEqualStrings("helix", b.name);1291    try std.testing.expectEqualStrings("25.01", b.version);12921293    // multi-output store paths drop their output-name suffix1294    const c = pkgFromStorePath("/nix/store/abcdefghijklmnopqrstuvwxyz012345-curl-8.20.0-bin");1295    try std.testing.expectEqualStrings("curl", c.name);1296    try std.testing.expectEqualStrings("8.20.0", c.version);1297}12981299fn firstStorePath(el: std.json.Value) ?[]const u8 {1300    if (el != .object) return null;1301    const sp = el.object.get("storePaths") orelse return null;1302    if (sp != .array or sp.array.items.len == 0) return null;1303    const first = sp.array.items[0];1304    return if (first == .string) first.string else null;1305}13061307// `nix profile list --json` has two shapes across nix versions: newer keys each1308// element by name (object), older lists them positionally (array). Handle both.1309fn renderProfileJson(gpa: std.mem.Allocator, json: []const u8) void {1310    const parsed = std.json.parseFromSlice(std.json.Value, gpa, json, .{}) catch return;1311    defer parsed.deinit();1312    if (parsed.value != .object) return;1313    const elements = parsed.value.object.get("elements") orelse return;1314    switch (elements) {1315        .object => |obj| {1316            var it = obj.iterator();1317            while (it.next()) |entry| {1318                const ver = if (firstStorePath(entry.value_ptr.*)) |p| pkgFromStorePath(p).version else "";1319                output.listPkg(entry.key_ptr.*, ver);1320            }1321        },1322        .array => |arr| {1323            for (arr.items) |el| {1324                const path = firstStorePath(el) orelse continue;1325                const row = pkgFromStorePath(path);1326                output.listPkg(row.name, row.version);1327            }1328        },1329        else => {},1330    }1331}13321333pub fn tryCmd(ctx: Ctx) !void {1334    const pkg_name_arg = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1335    const shell_pkg = types.NixPackage{ .attr = pkg_name_arg, .pname = pkg_name_arg, .version = "", .description = "" };1336    try tryPkg(ctx, shell_pkg);1337}13381339// --- Home Manager commands ---13401341const home_help = [_][2][]const u8{1342    .{ "init", "set up home manager for the first time" },1343    .{ "init --switch", "set up and activate immediately" },1344    .{ "apply", "apply home-manager configuration" },1345    .{ "apply --dry", "preview changes without activating" },1346    .{ "back", "roll back one generation" },1347    .{ "history", "list all generations" },1348    .{ "edit", "open home.nix" },1349    .{ "check", "validate without applying" },1350    .{ "diff", "compare the latest two generations" },1351    .{ "packages", "list managed packages" },1352};13531354const HomeGen = struct {1355    number: u32,1356    date: []const u8,1357    time: []const u8,1358    path: []const u8,1359};13601361// `home-manager generations` lines read:1362//   2026-06-01 11:56 : id 765 -> /nix/store/<hash>-home-manager-generation1363// Newest first, so index 0 is the current generation.1364fn parseHomeGenerations(gpa: std.mem.Allocator, out_str: []const u8) ![]HomeGen {1365    var gens: std.ArrayList(HomeGen) = .empty;1366    var lines = std.mem.splitScalar(u8, out_str, '\n');1367    while (lines.next()) |line| {1368        const t = std.mem.trim(u8, line, " \t\r");1369        if (t.len == 0) continue;1370        var it = std.mem.tokenizeAny(u8, t, " \t");1371        const date = it.next() orelse continue;1372        const time = it.next() orelse continue;1373        var number: ?u32 = null;1374        var path: []const u8 = "";1375        while (it.next()) |tok| {1376            if (std.mem.eql(u8, tok, "id")) {1377                if (it.next()) |n| number = std.fmt.parseInt(u32, n, 10) catch null;1378            } else if (std.mem.startsWith(u8, tok, "/nix/store/")) {1379                path = tok;1380            }1381        }1382        const num = number orelse continue;1383        try gens.append(gpa, .{1384            .number = num,1385            .date = try gpa.dupe(u8, date),1386            .time = try gpa.dupe(u8, time),1387            .path = try gpa.dupe(u8, path),1388        });1389    }1390    return gens.toOwnedSlice(gpa);1391}13921393fn freeHomeGens(gpa: std.mem.Allocator, gens: []HomeGen) void {1394    for (gens) |g| {1395        gpa.free(g.date);1396        gpa.free(g.time);1397        gpa.free(g.path);1398    }1399    gpa.free(gens);1400}14011402test "parseHomeGenerations reads id, date and store path" {1403    const a = std.testing.allocator;1404    const sample =1405        \\2026-06-01 11:56 : id 765 -> /nix/store/aaaa-home-manager-generation1406        \\2026-05-31 10:29 : id 764 -> /nix/store/bbbb-home-manager-generation1407    ;1408    const gens = try parseHomeGenerations(a, sample);1409    defer freeHomeGens(a, gens);1410    try std.testing.expectEqual(@as(usize, 2), gens.len);1411    try std.testing.expectEqual(@as(u32, 765), gens[0].number);1412    try std.testing.expectEqualStrings("2026-06-01", gens[0].date);1413    try std.testing.expectEqualStrings("11:56", gens[0].time);1414    try std.testing.expectEqualStrings("/nix/store/aaaa-home-manager-generation", gens[0].path);1415    try std.testing.expectEqual(@as(u32, 764), gens[1].number);1416}14171418// Current (newest) home generation number, or 0 if unavailable.1419fn homeCurrentGen(ctx: Ctx) u32 {1420    const out = exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine) catch return 0;1421    defer ctx.gpa.free(out);1422    const gens = parseHomeGenerations(ctx.gpa, out) catch return 0;1423    defer freeHomeGens(ctx.gpa, gens);1424    return if (gens.len > 0) gens[0].number else 0;1425}14261427pub fn home(ctx: Ctx) !void {1428    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help"))1429        return output.subcommandHelp("home", &home_help, null);14301431    // Home Manager manages the local user's environment. Detection (which binary,1432    // ~/.config/home-manager, $HOME/$USER for the flake ref) all read the LOCAL1433    // host, while exec routes over SSH for a remote machine — so `home --on1434    // <remote>` would decide mode/flake-ref from the wrong box. Refuse it cleanly1435    // rather than acting on a mismatch.1436    if (!ctx.machine.local) {1437        output.homeLocalOnly(ctx.machine.name);1438        return;1439    }14401441    // init runs before mode detection: its whole purpose is bootstrapping a host1442    // that has no home-manager yet, so a .none mode must not short-circuit it.1443    if (std.mem.eql(u8, ctx.sub, "init")) return homeInitCmd(ctx);14441445    const mode = exec.detectHomeManager(ctx.gpa, ctx.io, ctx.environ);1446    if (mode == .none) {1447        output.homeNotInstalled();1448        return;1449    }14501451    // apply is the only command meaningful in module mode (it redirects to1452    // `nina apply`); everything else needs the standalone home-manager CLI.1453    if (std.mem.eql(u8, ctx.sub, "apply")) return homeApply(ctx, mode);1454    // edit just opens the local home.nix — fine in module mode too.1455    if (std.mem.eql(u8, ctx.sub, "edit")) return homeEdit(ctx);14561457    if (mode == .module) {1458        output.homeModuleManaged();1459        return;1460    }14611462    if (std.mem.eql(u8, ctx.sub, "back")) return homeBack(ctx);1463    if (std.mem.eql(u8, ctx.sub, "history")) return homeHistory(ctx);1464    if (std.mem.eql(u8, ctx.sub, "check")) return homeCheck(ctx);1465    if (std.mem.eql(u8, ctx.sub, "diff")) return homeDiff(ctx);1466    if (std.mem.eql(u8, ctx.sub, "packages")) return homePackages(ctx);14671468    return output.subcommandHelp("home", &home_help, null);1469}14701471fn homePackages(ctx: Ctx) !void {1472    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1473    defer ctx.gpa.free(out);1474    const gens = try parseHomeGenerations(ctx.gpa, out);1475    defer freeHomeGens(ctx.gpa, gens);14761477    output.homePackagesHeader(ctx.machine.name);1478    if (gens.len == 0 or gens[0].path.len == 0) return;14791480    // The generation's OWN references are home-manager's activation deps1481    // (bash, coreutils, ...), not what the user installed. The user's packages1482    // live one level down, in the `…-home-manager-path` env the generation1483    // references — descend into it and list ITS references. Fall back to the1484    // generation refs if that env isn't present (older home-manager layouts).1485    const gen_refs = exec.homeGenerationReferences(ctx.gpa, ctx.io, &ctx.machine, gens[0].path) catch return;1486    defer ctx.gpa.free(gen_refs);14871488    var refs = gen_refs;1489    var env_refs: ?[]u8 = null;1490    defer if (env_refs) |e| ctx.gpa.free(e);1491    if (findHomeManagerPath(gen_refs)) |pkg_path| {1492        if (exec.homeGenerationReferences(ctx.gpa, ctx.io, &ctx.machine, pkg_path)) |e| {1493            env_refs = e;1494            refs = e;1495        } else |_| {}1496    }14971498    // Dedup by name: multi-output derivations (jq, jq-lib, jq-doc) collapse to1499    // the same name after the output suffix is stripped. Keys are slices into1500    // `refs`, valid for this function's lifetime.1501    var seen = std.StringHashMap(void).init(ctx.gpa);1502    defer seen.deinit();1503    var lines = std.mem.splitScalar(u8, refs, '\n');1504    while (lines.next()) |line| {1505        const t = std.mem.trim(u8, line, " \t\r");1506        if (t.len == 0) continue;1507        const row = pkgFromStorePath(t);1508        if (row.version.len == 0) continue;1509        if (std.mem.indexOf(u8, row.name, "home-manager") != null) continue;1510        if (seen.contains(row.name)) continue;1511        seen.put(row.name, {}) catch {};1512        output.listPkg(row.name, row.version);1513    }1514}15151516// The `…-home-manager-path` env among a generation's references — the buildEnv1517// of the user's home.packages. Returns the full store-path line, or null.1518fn findHomeManagerPath(refs: []const u8) ?[]const u8 {1519    var lines = std.mem.splitScalar(u8, refs, '\n');1520    while (lines.next()) |line| {1521        const t = std.mem.trim(u8, line, " \t\r");1522        if (std.mem.indexOf(u8, t, "home-manager-path") != null) return t;1523    }1524    return null;1525}15261527test "findHomeManagerPath picks the env, not the generation or infra" {1528    const refs =1529        \\/nix/store/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-bash-5.31530        \\/nix/store/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb-home-manager-path1531        \\/nix/store/cccccccccccccccccccccccccccccccc-coreutils-9.111532    ;1533    try std.testing.expectEqualStrings(1534        "/nix/store/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb-home-manager-path",1535        findHomeManagerPath(refs).?,1536    );1537    try std.testing.expectEqual(@as(?[]const u8, null), findHomeManagerPath("/nix/store/x-bash-5.3\n"));1538}15391540fn homeDiff(ctx: Ctx) !void {1541    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1542    defer ctx.gpa.free(out);1543    const gens = try parseHomeGenerations(ctx.gpa, out);1544    defer freeHomeGens(ctx.gpa, gens);15451546    // Need two generations and both their store paths to diff their closures.1547    if (gens.len < 2 or gens[0].path.len == 0 or gens[1].path.len == 0) {1548        output.homeNothingToDiff();1549        return;1550    }1551    const newer = gens[0];1552    const older = gens[1];1553    output.homeDiffHeader(older.number, newer.number, ctx.machine.name);1554    if (try exec.diffClosuresPaths(ctx.io, &ctx.machine, ctx.gpa, older.path, newer.path) != 0)1555        return error.ProcessFailed;1556}15571558fn homeCheck(ctx: Ctx) !void {1559    output.homeCheckStart(ctx.machine.name);1560    const code = try exec.homeManagerBuild(ctx.io, &ctx.machine, ctx.gpa, ctx.passthrough);1561    if (code != 0) return error.BuildFailed;1562    output.homeCheckOk();1563}15641565fn homeEdit(ctx: Ctx) !void {1566    // Standalone home config lives at ~/.config/home-manager/home.nix; the same1567    // path is what detection keys on for module mode, so it resolves for both.1568    const path = exec.homeNixPath(ctx.gpa, ctx.environ) orelse {1569        errors.error_info.setMessage("could not resolve ~/.config/home-manager/home.nix", .{});1570        return error.ConfigNotFound;1571    };1572    defer ctx.gpa.free(path);1573    output.homeEditOpen(path, ctx.cfg.editor);1574    _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, path, null);1575}15761577fn homeHistory(ctx: Ctx) !void {1578    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1579    defer ctx.gpa.free(out);1580    const gens = try parseHomeGenerations(ctx.gpa, out);1581    defer freeHomeGens(ctx.gpa, gens);1582    output.homeHistoryHeader(ctx.machine.name);1583    // Newest-first from home-manager; the first row is the current generation.1584    for (gens, 0..) |g, i| output.homeHistoryRow(g.number, g.date, g.time, i == 0);1585}15861587fn homeBack(ctx: Ctx) !void {1588    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1589    defer ctx.gpa.free(out);1590    const gens = try parseHomeGenerations(ctx.gpa, out);1591    defer freeHomeGens(ctx.gpa, gens);15921593    // Newest-first: [0] is current, [1] is the generation to roll back to.1594    if (gens.len < 2) {1595        output.alreadyOldest();1596        return;1597    }1598    const current = gens[0].number;1599    const prev = gens[1].number;16001601    output.homeBackStart(ctx.machine.name, current, prev);1602    if (ctx.cfg.confirm and !output.confirm("")) return;1603    const code = try exec.homeManagerRollback(ctx.io, &ctx.machine, ctx.gpa);1604    if (code != 0) return error.BuildFailed;1605    output.homeBackDone(prev);1606}16071608fn homeInitCmd(ctx: Ctx) !void {1609    var switch_on_init = false;1610    var dir: ?[]const u8 = null;1611    for (ctx.args) |arg| {1612        if (std.mem.eql(u8, arg, "--switch")) {1613            switch_on_init = true;1614        } else if (!std.mem.startsWith(u8, arg, "-")) {1615            dir = arg;1616        }1617    }16181619    // Guard only the default location — a custom dir is the user's call, and1620    // home-manager creates it. Never clobber an existing ~/.config/home-manager.1621    if (dir == null) {1622        if (exec.homeNixPath(ctx.gpa, ctx.environ)) |path| {1623            defer ctx.gpa.free(path);1624            if (exec.pathExists(ctx.io, path)) {1625                output.homeInitExists(path);1626                return;1627            }1628        }1629    }16301631    output.homeInitStart(switch_on_init, dir);1632    const code = try exec.homeManagerInit(ctx.io, &ctx.machine, ctx.gpa, switch_on_init, dir);1633    if (code != 0) return error.BuildFailed;1634    output.homeInitDone(switch_on_init);1635}16361637fn homeApply(ctx: Ctx, mode: exec.HomeManagerMode) !void {1638    // NixOS/flake module: home config is rebuilt by nixos-rebuild — redirect.1639    if (mode == .module) {1640        output.homeModuleManaged();1641        return;1642    }1643    if (ctx.dry) {1644        output.homeApplyDry(ctx.machine.name);1645        const code = try exec.homeManagerBuild(ctx.io, &ctx.machine, ctx.gpa, ctx.passthrough);1646        if (code != 0) return error.BuildFailed;1647        output.homeApplyDryDone();1648        return;1649    }16501651    if (!try runPreHook(ctx, "pre-home")) {1652        output.aborted();1653        return error.HookAborted;1654    }16551656    output.homeApplyStart(ctx.machine.name);16571658    // Flake-based home config: switch by attribute with a graceful fallback1659    // chain. A channel-based config (no flake.nix) uses a plain switch.1660    const dir = exec.homeFlakeDir(ctx.gpa, ctx.io, ctx.environ);1661    defer if (dir) |d| ctx.gpa.free(d);1662    if (dir) |d| return homeApplyFlake(ctx, d);16631664    output.printSubstep("home-manager switch", .{});1665    const start = std.Io.Clock.awake.now(ctx.io);1666    const code = try exec.homeManagerSwitch(ctx.io, &ctx.machine, ctx.gpa, ctx.passthrough);1667    if (code != 0) return error.BuildFailed;16681669    const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());1670    const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));1671    output.homeApplyDone(homeCurrentGen(ctx), elapsed);1672    runPostHook(ctx, "post-home");1673}16741675// Switch a flake-based home config, trying the most specific attribute first:1676//   <dir>#<user>-<arch>-<os>  →  <dir>#<user>  →  <dir>  (home-manager resolves)1677// Each fallback fires only on a missing-attribute error, never on a real build1678// failure. Mirrors how ${USER}-${system} homeConfigurations keys are written.1679fn homeApplyFlake(ctx: Ctx, dir: []const u8) !void {1680    const user = ctx.environ.get("USER") orelse "default";16811682    var refs: std.ArrayList([]const u8) = .empty;1683    defer {1684        for (refs.items) |r| ctx.gpa.free(r);1685        refs.deinit(ctx.gpa);1686    }1687    if (exec.homeManagerAttr(ctx.gpa, ctx.io, &ctx.machine, ctx.environ) catch null) |attr| {1688        defer ctx.gpa.free(attr);1689        try refs.append(ctx.gpa, try std.fmt.allocPrint(ctx.gpa, "{s}#{s}", .{ dir, attr }));1690    }1691    try refs.append(ctx.gpa, try std.fmt.allocPrint(ctx.gpa, "{s}#{s}", .{ dir, user }));1692    try refs.append(ctx.gpa, try ctx.gpa.dupe(u8, dir));16931694    const start = std.Io.Clock.awake.now(ctx.io);1695    for (refs.items, 0..) |ref, i| {1696        output.printSubstep("home-manager switch --flake {s}", .{ref});1697        switch (try exec.homeManagerSwitchFlake(ctx.io, &ctx.machine, ctx.gpa, ref, ctx.passthrough)) {1698            .ok => {1699                const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());1700                const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));1701                output.homeApplyDone(homeCurrentGen(ctx), elapsed);1702                runPostHook(ctx, "post-home");1703                return;1704            },1705            // Attr not defined by the flake — drop to the next candidate.1706            .attr_missing => {1707                if (i + 1 < refs.items.len) output.homeAttrFallback(ref);1708                continue;1709            },1710            .failed => return error.BuildFailed,1711        }1712    }1713    return error.BuildFailed;1714}17151716// --- Service commands ---17171718const service_help = [_][2][]const u8{1719    .{ "list", "list running services" },1720    .{ "logs <svc>", "show service logs" },1721    .{ "status <svc>", "service status" },1722    .{ "start <svc>", "start a service" },1723    .{ "stop <svc>", "stop a service" },1724    .{ "restart <svc>", "restart a service" },1725    .{ "enable <svc>", "enable at boot" },1726    .{ "disable <svc>", "disable at boot" },1727};17281729// Verbs service() is willing to forward to `sudo systemctl`. Anything else1730// (mask, kill, revert, edit, isolate, ...) used to reach systemctl with no1731// confirmation and without appearing in service_help, since the dispatcher1732// forwarded ctx.sub verbatim after list/logs/status (NINA-011).1733fn serviceVerbAllowed(verb: []const u8) bool {1734    const known = [_][]const u8{ "start", "stop", "restart", "enable", "disable" };1735    for (known) |v| {1736        if (std.mem.eql(u8, verb, v)) return true;1737    }1738    return false;1739}17401741pub fn service(ctx: Ctx) !void {1742    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("service", &service_help, "add --user to act on user services");1743    if (std.mem.eql(u8, ctx.sub, "list")) {1744        output.serviceListHeader(ctx.machine.name);1745        const svcs = exec.serviceList(ctx.gpa, ctx.io, &ctx.machine, ctx.user) catch &.{};1746        defer ctx.gpa.free(svcs);1747        for (svcs) |s| output.serviceRow(s);1748        return;1749    }1750    if (std.mem.eql(u8, ctx.sub, "logs")) {1751        const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1752        const follow = ctx.args.len > 1 and std.mem.eql(u8, ctx.args[1], "-f");1753        output.serviceLogsHeader(name, ctx.last, ctx.machine.name);1754        _ = try exec.serviceLogs(ctx.io, &ctx.machine, ctx.gpa, name, ctx.last, follow, ctx.user);1755        return;1756    }1757    if (std.mem.eql(u8, ctx.sub, "status")) {1758        const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1759        output.serviceVerb("status", name, ctx.machine.name);1760        _ = try exec.serviceCtl(ctx.io, &ctx.machine, ctx.gpa, "status", name, ctx.user);1761        return;1762    }1763    // start/stop/restart/enable/disable — checked against the allowlist before1764    // ctx.args is even read, so an unrecognized verb never gets far enough to1765    // touch a target service name.1766    if (!serviceVerbAllowed(ctx.sub)) {1767        output.subcommandHelp("service", &service_help, "add --user to act on user services");1768        return error.Internal;1769    }1770    const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1771    if (ctx.cfg.confirm and (std.mem.eql(u8, ctx.sub, "stop") or std.mem.eql(u8, ctx.sub, "disable"))) {1772        if (!output.confirm("")) return;1773    }1774    output.serviceVerb(ctx.sub, name, ctx.machine.name);1775    _ = try exec.serviceCtl(ctx.io, &ctx.machine, ctx.gpa, ctx.sub, name, ctx.user);1776    output.serviceDone();1777}17781779test "serviceVerbAllowed allows only the verbs listed in service_help" {1780    try std.testing.expect(serviceVerbAllowed("start"));1781    try std.testing.expect(serviceVerbAllowed("stop"));1782    try std.testing.expect(serviceVerbAllowed("restart"));1783    try std.testing.expect(serviceVerbAllowed("enable"));1784    try std.testing.expect(serviceVerbAllowed("disable"));1785}17861787test "serviceVerbAllowed rejects verbs systemctl accepts but nina never confirmed or documented" {1788    try std.testing.expect(!serviceVerbAllowed("mask"));1789    try std.testing.expect(!serviceVerbAllowed("kill"));1790    try std.testing.expect(!serviceVerbAllowed("revert"));1791    try std.testing.expect(!serviceVerbAllowed("edit"));1792    try std.testing.expect(!serviceVerbAllowed("isolate"));1793    try std.testing.expect(!serviceVerbAllowed("starting")); // no substring match on "start"1794}17951796// --- Flake commands ---17971798const flake_help = [_][2][]const u8{1799    .{ "init", "create a new flake.nix" },1800    .{ "update", "update flake inputs" },1801    .{ "update <in>", "update a specific input" },1802    .{ "check", "validate the flake" },1803    .{ "show", "inspect flake outputs" },1804    .{ "lock", "regenerate flake.lock" },1805    .{ "clone <url>", "clone a flake repository" },1806};18071808pub fn flake(ctx: Ctx) !void {1809    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("flake", &flake_help, null);1810    if (std.mem.eql(u8, ctx.sub, "update")) {1811        output.flakeUpdateStart();1812        const input: ?[]const u8 = if (ctx.args.len > 0) ctx.args[0] else null;1813        _ = try exec.flakeUpdate(ctx.io, &ctx.machine, ctx.gpa, input, ctx.passthrough);1814        output.flakeLockWritten();1815        return;1816    }1817    if (std.mem.eql(u8, ctx.sub, "check")) {1818        output.flakeCheckStart();1819        const code = try exec.flakeCheck(ctx.io, &ctx.machine, ctx.gpa, ctx.passthrough);1820        if (code != 0) {1821            output.checkFailed("");1822            return error.CheckFailed;1823        }1824        output.flakeValid();1825        return;1826    }1827    if (std.mem.eql(u8, ctx.sub, "show")) {1828        const json_out = exec.flakeShow(ctx.gpa, ctx.io, &ctx.machine) catch null;1829        if (json_out) |j| {1830            defer ctx.gpa.free(j);1831            output.flakeShowHeader("flake outputs");1832            // Parse and display the flake outputs1833            const parsed = std.json.parseFromSlice(std.json.Value, ctx.gpa, j, .{}) catch return;1834            defer parsed.deinit();1835            if (parsed.value == .object) {1836                var it = parsed.value.object.iterator();1837                while (it.next()) |entry| {1838                    if (entry.value_ptr.* == .object) {1839                        var inner = entry.value_ptr.object.iterator();1840                        while (inner.next()) |e2| {1841                            const desc = if (e2.value_ptr.* == .object)1842                                if (e2.value_ptr.object.get("description")) |d|1843                                    if (d == .string) d.string else ""1844                                else1845                                    ""1846                            else1847                                "";1848                            output.flakeShowEntry(entry.key_ptr.*, e2.key_ptr.*, desc);1849                        }1850                    }1851                }1852            }1853        }1854        return;1855    }1856    if (std.mem.eql(u8, ctx.sub, "init")) {1857        _ = try exec.flakeInit(ctx.io, &ctx.machine, ctx.gpa);1858        return;1859    }1860    if (std.mem.eql(u8, ctx.sub, "lock")) {1861        _ = try exec.flakeLock(ctx.io, &ctx.machine, ctx.gpa);1862        return;1863    }1864    if (std.mem.eql(u8, ctx.sub, "clone")) {1865        const url = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1866        _ = try exec.flakeClone(ctx.io, &ctx.machine, ctx.gpa, url);1867        return;1868    }1869}18701871// --- Store commands ---18721873const store_help = [_][2][]const u8{1874    .{ "info", "store size and counts" },1875    .{ "path <attr>", "store path of a package" },1876    .{ "gc", "collect garbage" },1877    .{ "optimise", "deduplicate store paths with hard links" },1878    .{ "verify", "verify store integrity" },1879    .{ "repair", "repair corrupted paths" },1880};18811882pub fn store(ctx: Ctx) !void {1883    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("store", &store_help, null);1884    if (std.mem.eql(u8, ctx.sub, "gc")) {1885        _ = try exec.storeGc(ctx.io, &ctx.machine, ctx.gpa);1886        return;1887    }1888    // Accept both spellings — optimise (en) and optimize (us).1889    if (std.mem.eql(u8, ctx.sub, "optimise") or std.mem.eql(u8, ctx.sub, "optimize")) {1890        output.storeOptimiseStart(ctx.machine.name);1891        _ = try exec.storeOptimise(ctx.io, &ctx.machine, ctx.gpa);1892        output.storeOptimiseDone();1893        return;1894    }1895    if (std.mem.eql(u8, ctx.sub, "verify")) {1896        output.storeVerifyStart();1897        _ = try exec.storeVerify(ctx.io, &ctx.machine, ctx.gpa);1898        return;1899    }1900    if (std.mem.eql(u8, ctx.sub, "repair")) {1901        if (ctx.cfg.confirm and !output.confirm("")) return;1902        output.storeRepairStart();1903        _ = try exec.storeRepair(ctx.io, &ctx.machine, ctx.gpa);1904        return;1905    }1906    if (std.mem.eql(u8, ctx.sub, "info")) {1907        const si = try exec.storeInfo(ctx.gpa, ctx.io, &ctx.machine);1908        output.storeInfo(si);1909        return;1910    }1911    if (std.mem.eql(u8, ctx.sub, "path")) {1912        const attr = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1913        const path = try exec.storePath(ctx.gpa, ctx.io, &ctx.machine, attr);1914        defer ctx.gpa.free(path);1915        output.storePath(path);1916        return;1917    }1918    // default: info1919    const si = try exec.storeInfo(ctx.gpa, ctx.io, &ctx.machine);1920    output.storeInfo(si);1921}19221923// --- Channel commands ---19241925const channel_help = [_][2][]const u8{1926    .{ "list", "list channels" },1927    .{ "add <url> [name]", "add a channel" },1928    .{ "remove <name>", "remove a channel" },1929    .{ "update", "update all channels" },1930};19311932pub fn channel(ctx: Ctx) !void {1933    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("channel", &channel_help, null);1934    // On a flake-managed system, nix-channel operations generally don't apply.1935    if (flakeSystem(ctx)) output.flakeChannelNote();1936    if (std.mem.eql(u8, ctx.sub, "list")) {1937        output.channelListHeader(ctx.machine.name);1938        const chans = try exec.channelList(ctx.gpa, ctx.io, &ctx.machine);1939        defer ctx.gpa.free(chans);1940        for (chans) |ch| output.channelRow(ch);1941        return;1942    }1943    if (std.mem.eql(u8, ctx.sub, "add")) {1944        const url = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1945        const name = if (ctx.args.len > 1) ctx.args[1] else "";1946        _ = try exec.channelAdd(ctx.io, &ctx.machine, ctx.gpa, url, name);1947        output.channelDone();1948        return;1949    }1950    if (std.mem.eql(u8, ctx.sub, "remove")) {1951        const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1952        _ = try exec.channelRemove(ctx.io, &ctx.machine, ctx.gpa, name);1953        output.channelDone();1954        return;1955    }1956    if (std.mem.eql(u8, ctx.sub, "update")) {1957        return channelUpdateCmd(ctx);1958    }1959}19601961// --- Profile commands ---19621963pub fn profile(ctx: Ctx) !void {1964    if (std.mem.eql(u8, ctx.sub, "list") or ctx.sub.len == 0) {1965        output.profileListHeader();1966        const out = exec.profileList(ctx.gpa, ctx.io, &ctx.machine) catch null;1967        if (out) |o| {1968            defer ctx.gpa.free(o);1969            var lines = std.mem.splitScalar(u8, o, '\n');1970            while (lines.next()) |line| {1971                const t = std.mem.trim(u8, line, " \t\r");1972                if (t.len == 0) continue;1973                output.profileRow(t, "", "");1974            }1975        }1976        return;1977    }1978    if (std.mem.eql(u8, ctx.sub, "install")) {1979        const attr = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1980        _ = try exec.profileInstall(ctx.io, &ctx.machine, ctx.gpa, ctx.environ, attr, false);1981        output.done();1982        return;1983    }1984    if (std.mem.eql(u8, ctx.sub, "remove")) {1985        const attr = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1986        _ = try exec.profileRemove(ctx.io, &ctx.machine, ctx.gpa, attr);1987        output.done();1988        return;1989    }1990    if (std.mem.eql(u8, ctx.sub, "upgrade")) {1991        _ = try exec.profileUpgrade(ctx.io, &ctx.machine, ctx.gpa);1992        output.done();1993        return;1994    }1995}19961997// --- Pkg commands ---19981999const pkg_help = [_][2][]const u8{2000    .{ "why <pkg>", "what pulled it in" },2001    .{ "deps <pkg>", "direct dependencies" },2002    .{ "size <pkg>", "closure size" },2003    .{ "path <pkg>", "store path" },2004    .{ "closure <pkg>", "full closure" },2005};20062007pub fn pkg(ctx: Ctx) !void {2008    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("pkg", &pkg_help, null);2009    const name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;2010    if (std.mem.eql(u8, ctx.sub, "why")) {2011        if (try exec.pkgWhy(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;2012        return;2013    }2014    if (std.mem.eql(u8, ctx.sub, "deps")) {2015        if (try exec.pkgDeps(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;2016        return;2017    }2018    if (std.mem.eql(u8, ctx.sub, "size")) {2019        const s = try exec.pkgSize(ctx.gpa, ctx.io, &ctx.machine, name);2020        defer ctx.gpa.free(s);2021        output.pkgResult("size", s);2022        return;2023    }2024    if (std.mem.eql(u8, ctx.sub, "path")) {2025        const p = try exec.storePath(ctx.gpa, ctx.io, &ctx.machine, name);2026        defer ctx.gpa.free(p);2027        output.pkgResult("path", p);2028        return;2029    }2030    if (std.mem.eql(u8, ctx.sub, "closure")) {2031        if (try exec.pkgClosure(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;2032        return;2033    }2034}20352036// Top-level alias for `nina pkg why <pkg>` — surfaces what pulled a package in2037// without the user needing to know about the `pkg` subgroup.2038pub fn why(ctx: Ctx) !void {2039    const name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;2040    if (try exec.pkgWhy(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;2041}20422043// --- Pin / Unpin ---20442045// `nina pin` is not implemented — editFlakeLock (exec.zig) was a stub that2046// silently did nothing while this printed a success line implying an input2047// had been pinned (NINA-008). Pinning an input to a commit requires resolving2048// that input's existing source (github/gitlab/generic git, each with its own2049// flake-ref shape) from flake.lock before nix can override it, which is real2050// scope beyond a mechanical fix — so this fails loudly instead of lying.2051pub fn pin(ctx: Ctx) !void {2052    _ = ctx;2053    errors.error_info.setMessage("nina pin is not implemented yet", .{});2054    errors.error_info.setSuggestion("override manually: nix flake lock --override-input <input> <flake-ref>", .{});2055    return error.NotImplemented;2056}20572058pub fn unpin(ctx: Ctx) !void {2059    const input = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;2060    _ = try exec.flakeUpdate(ctx.io, &ctx.machine, ctx.gpa, input, &.{});2061    output.unpinDone(input);2062}20632064test "pin reports NotImplemented instead of a fake success" {2065    // pin() ignores every field of ctx before returning, so an undefined2066    // value is safe here and avoids constructing a real std.Io/machine/config.2067    const ctx: Ctx = undefined;2068    try std.testing.expectError(error.NotImplemented, pin(ctx));2069}20702071// --- Hash / Fetch ---20722073pub fn hash(ctx: Ctx) !void {2074    const path = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;2075    const h = try exec.nixHash(ctx.gpa, ctx.io, &ctx.machine, path);2076    defer ctx.gpa.free(h);2077    output.hashResult(std.mem.trim(u8, h, " \t\n\r"));2078}20792080pub fn fetch(ctx: Ctx) !void {2081    const url = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;2082    const h = try exec.nixFetch(ctx.gpa, ctx.io, &ctx.machine, url);2083    defer ctx.gpa.free(h);2084    output.fetchResult(std.mem.trim(u8, h, " \t\n\r"), url);2085}20862087// --- Build / Run ---20882089pub fn build(ctx: Ctx) !void {2090    const attr: ?[]const u8 = if (ctx.args.len > 0) ctx.args[0] else null;2091    output.buildStart(attr orelse "default");2092    const code = try exec.nixBuild(ctx.io, &ctx.machine, ctx.gpa, attr, ctx.passthrough);2093    if (code != 0) return error.BuildFailed;2094    output.buildDone();2095}20962097pub fn runCmd(ctx: Ctx) !void {2098    const pkg_arg = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;2099    output.runStart(pkg_arg);2100    _ = try exec.nixRun(ctx.io, &ctx.machine, ctx.gpa, pkg_arg, ctx.passthrough);2101}21022103// --- Hello ---21042105pub fn hello(ctx: Ctx) !void {2106    output.hello(ctx.cfg.machines);2107}21082109const ConfigKind = enum { flake, channel, none };21102111// Scan the conventional /etc/nixos for a flake.nix (flake-based) or a2112// configuration.nix (channel-based) to pre-fill the wizard's defaults.2113fn scanConfig(io: std.Io) ConfigKind {2114    if (exec.pathExists(io, "/etc/nixos/flake.nix")) return .flake;2115    if (exec.pathExists(io, "/etc/nixos/configuration.nix")) return .channel;2116    return .none;2117}21182119// Runs when the config is absent on first invocation (interactive TTY only).2120// Scans for an existing nixos config, detects flake vs channel, and offers a2121// smart default path — flake-ness is detected, never asked.2122pub fn firstRunWizard(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) !void {2123    output.firstRunBanner();2124    output.firstRunNoConfig();21252126    var name_buf: [256]u8 = undefined;2127    var path_buf: [256]u8 = undefined;21282129    const machine_name = output.firstRunPrompt("machine name", "my-machine", &name_buf);21302131    output.firstRunScanning();2132    const kind = scanConfig(io);2133    switch (kind) {2134        .flake => output.firstRunDetected("/etc/nixos/flake.nix", true),2135        .channel => output.firstRunDetected("/etc/nixos/configuration.nix", false),2136        .none => output.firstRunNoneFound(),2137    }21382139    // Detected systems default to /etc/nixos (press enter to confirm); when2140    // nothing was found, leave the default empty so the user must type a path.2141    const default_path: []const u8 = if (kind == .none) "" else "/etc/nixos";2142    const config_path = output.firstRunPromptDefault("config path", default_path, kind != .none, &path_buf);21432144    // Re-detect at the chosen path in case the user pointed elsewhere — flake.nix2145    // there means a flake system, recorded so channel commands warn appropriately.2146    const use_flakes = exec.dirHasFlake(gpa, io, config_path);21472148    const conf_path = try config.configPath(gpa, environ);2149    defer gpa.free(conf_path);2150    if (std.fs.path.dirname(conf_path)) |dir| exec.ensureDir(gpa, io, dir);21512152    // `flake` is a top-level config field, so it must precede the [machine] block.2153    const flake_line = if (use_flakes) "flake = true\n" else "";2154    var content_buf: [1024]u8 = undefined;2155    const content = try std.fmt.bufPrint(2156        &content_buf,2157        "{s}[machine]\nname = {s}\nconfig = {s}\nlocal = true\n",2158        .{ flake_line, machine_name, config_path },2159    );21602161    const file = std.Io.Dir.createFile(.cwd(), io, conf_path, .{}) catch {2162        errors.error_info.setMessage("could not write {s}", .{conf_path});2163        return error.Internal;2164    };2165    defer file.close(io);2166    file.writePositionalAll(io, content, 0) catch {2167        errors.error_info.setMessage("could not write {s}", .{conf_path});2168        return error.Internal;2169    };21702171    output.firstRunWritten(conf_path);2172}21732174pub fn setup(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) !void {2175    // Create the config first if it doesn't exist. This makes `nina setup`2176    // a complete onboarding command — not just a nix-features check. Any legacy2177    // ~/.nina.conf is migrated to the XDG path before we decide to run the wizard.2178    config.migrateLegacyConfig(gpa, io, environ);2179    if (config.configPath(gpa, environ)) |conf_path| {2180        defer gpa.free(conf_path);2181        if (std.Io.Dir.openFile(.cwd(), io, conf_path, .{})) |f| {2182            f.close(io);2183        } else |_| {2184            try firstRunWizard(gpa, io, environ);2185            errors.error_info.reset();2186        }2187    } else |_| {}21882189    output.setupCheck();2190    const status = exec.checkNixFeatures(gpa, io, environ);2191    output.setupFeatures(status.nix_command, status.flakes);21922193    if (status.allEnabled()) {2194        output.setupAllSet();2195        api.ensureRegistryPinned(gpa, io, environ);2196        return;2197    }21982199    // On NixOS the features belong in configuration.nix (the declarative,2200    // permanent home), not ~/.config/nix/nix.conf. Offer to add the one line;2201    // the user runs the rebuild. We don't pin the registry here because the2202    // features aren't live until that rebuild lands.2203    if (exec.isNixOS(io)) {2204        const conf_path = "/etc/nixos/configuration.nix";2205        if (exec.nixosConfigEnablesFeatures(gpa, io, conf_path)) {2206            output.setupNixosNeedsRebuild(conf_path);2207            return;2208        }2209        output.setupNixosOffer(exec.NIXOS_FEATURES_LINE, conf_path);2210        if (output.confirmDefaultNo("add it now?")) {2211            if (exec.appendFeaturesToNixosConfig(gpa, io, environ, conf_path)) |_| {2212                output.setupNixosWrote(conf_path);2213            } else |_| {2214                output.setupNixosManual(exec.NIXOS_FEATURES_LINE, conf_path);2215            }2216        } else {2217            output.setupNixosManual(exec.NIXOS_FEATURES_LINE, conf_path);2218        }2219        return;2220    }22212222    // Non-NixOS: a user-level nix.conf takes effect immediately, no sudo needed.2223    output.setupEnabling();2224    const path = try exec.enableNixFeatures(gpa, io, environ);2225    defer gpa.free(path);22262227    output.setupDone(path);2228    api.ensureRegistryPinned(gpa, io, environ);2229}22302231// --- Log helper ---22322233fn logAction(ctx: Ctx, action: []const u8, gen: u32) void {2234    var ts_buf: [32]u8 = undefined;2235    const ts = nowIso(ctx.io, &ts_buf);2236    var buf: [256]u8 = undefined;2237    const entry = std.fmt.bufPrint(&buf, "{{\"ts\":\"{s}\",\"machine\":\"{s}\",\"command\":\"{s}\",\"outcome\":\"success\",\"gen_before\":null,\"gen_after\":{d},\"duration_ms\":0}}\n", .{2238        ts, ctx.machine.name, action, gen,2239    }) catch return;2240    exec.appendNinaLog(ctx.io, ctx.environ, entry);2241}22422243// Wall-clock UTC as ISO-8601. Uses Io.Clock.real (the settable Unix-epoch clock);2244// Io.Clock.awake is monotonic and unsuitable for timestamps. Falls back to epoch 0.2245fn nowIso(io: std.Io, buf: []u8) []const u8 {2246    const fallback = "1970-01-01T00:00:00Z";2247    const ns = std.Io.Clock.real.now(io).toNanoseconds();2248    if (ns <= 0) return fallback;2249    const secs: u64 = @intCast(@divFloor(ns, 1_000_000_000));2250    const es = std.time.epoch.EpochSeconds{ .secs = secs };2251    const ed = es.getEpochDay();2252    const yd = ed.calculateYearDay();2253    const md = yd.calculateMonthDay();2254    const ds = es.getDaySeconds();2255    return std.fmt.bufPrint(buf, "{d:0>4}-{d:0>2}-{d:0>2}T{d:0>2}:{d:0>2}:{d:0>2}Z", .{2256        yd.year,              md.month.numeric(),      @as(u32, md.day_index) + 1,2257        ds.getHoursIntoDay(), ds.getMinutesIntoHour(), ds.getSecondsIntoMinute(),2258    }) catch return fallback;2259}