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";1516pub const Ctx = struct {17    gpa: std.mem.Allocator,18    io: std.Io,19    environ: *const std.process.Environ.Map,20    machine: types.Machine,21    cfg: types.NinaConfig,22    args: []const []const u8, // positional args after subcommand23    sub: []const u8, // subcommand (e.g. "list" in "service list")24    dry: bool,25    check: bool,26    no_apply: bool,27    all: bool,28    last: u32,29    json: bool,30    user: bool, // --user: operate on user (vs system) services31};3233// A system is flake-managed when the config says so OR a flake.nix is present in34// the config dir. Detection means a fresh channel user who points nina at a flake35// dir gets the right behavior without editing config first.36fn flakeSystem(ctx: Ctx) bool {37    return ctx.cfg.flake or exec.configHasFlake(ctx.gpa, ctx.io, &ctx.machine);38}3940fn runPreHook(ctx: Ctx, hook_name: []const u8) !bool {41    const hook = try exec.runHook(ctx.gpa, ctx.io, ctx.environ, hook_name);42    defer ctx.gpa.free(hook.output);43    switch (hook.result) {44        .not_found, .ok => return true,45        .failed => {46            output.hookFailed(hook_name, hook.exit_code, hook.output);47            return output.confirmDefaultNo("continue anyway?");48        },49    }50}5152fn runPostHook(ctx: Ctx, hook_name: []const u8) void {53    const hook = exec.runHook(ctx.gpa, ctx.io, ctx.environ, hook_name) catch return;54    defer ctx.gpa.free(hook.output);55    if (hook.result == .failed) {56        output.hookWarning(hook_name, hook.exit_code, hook.output);57    }58}5960pub fn apply(ctx: Ctx) !void {61    if (ctx.dry) {62        output.applyDry(ctx.machine.name);63        const code = try exec.nixosRebuildDryActivate(ctx.io, &ctx.machine, ctx.gpa);64        if (code != 0) return error.BuildFailed;65        output.applyDryDone();66        return;67    }68    if (ctx.check) {69        return check(ctx);70    }7172    if (!try runPreHook(ctx, "pre-apply")) {73        output.aborted();74        return error.HookAborted;75    }7677    output.applyStart(ctx.machine.name);78    output.buildPanelInit();79    const start = std.Io.Clock.awake.now(ctx.io);8081    var panel = output.BuildPanel{};82    const code = exec.nixosRebuildSwitchWithPanel(ctx.io, &ctx.machine, ctx.gpa, &panel) catch |e| {83        output.buildPanelClear();84        exec.markApplyFailed(ctx.io, ctx.environ);85        return e;86    };87    output.buildPanelClear();8889    if (code != 0) {90        exec.markApplyFailed(ctx.io, ctx.environ);91        return error.BuildFailed;92    }9394    const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());95    const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));96    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine) catch 0;97    const after_failure = exec.takeApplyFailed(ctx.io, ctx.environ);98    output.applyDone(gen, elapsed, after_failure);99    // Show any nix warnings collected during the build (dim yellow, after success line).100    const warnings = errors.extractWarnings(ctx.gpa, errors.getBuildStderr()) catch &.{};101    defer {102        for (warnings) |w| ctx.gpa.free(w);103        ctx.gpa.free(warnings);104    }105    if (warnings.len > 0) output.buildWarnings(warnings);106    runPostHook(ctx, "post-apply");107    logAction(ctx, "apply", gen);108}109110pub fn check(ctx: Ctx) !void {111    output.checkStart(ctx.machine.name);112    const code = try exec.nixosRebuildBuild(ctx.io, &ctx.machine, ctx.gpa);113    if (code != 0) return error.BuildFailed;114    output.checkOk();115}116117pub fn back(ctx: Ctx) !void {118    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);119    defer ctx.gpa.free(gens);120121    var current: u32 = 0;122    for (gens) |g| if (g.current) {123        current = g.number;124    };125126    // Newest generation older than current. If there is none, we're already at the127    // oldest — stop cleanly instead of letting rollback fail with 'build failed'.128    var prev: u32 = 0;129    var has_prev = false;130    for (gens) |g| {131        if (g.number < current and (!has_prev or g.number > prev)) {132            prev = g.number;133            has_prev = true;134        }135    }136    if (!has_prev) {137        output.alreadyOldest();138        return;139    }140141    if (!try runPreHook(ctx, "pre-back")) {142        output.aborted();143        return error.HookAborted;144    }145146    output.backStart(ctx.machine.name, current, prev);147    if (ctx.cfg.confirm and !output.confirm("")) return;148149    // Flake systems don't have <nixos-config> in the Nix search path, so150    // `nixos-rebuild --rollback` fails. Switch by generation number instead151    // (same path as `nina go N`), which works for both channel and flake.152    const code = if (flakeSystem(ctx))153        try exec.switchGeneration(ctx.io, &ctx.machine, ctx.gpa, prev)154    else155        try exec.rollback(ctx.io, &ctx.machine, ctx.gpa);156    if (code != 0) return error.BuildFailed;157    output.backDone(prev);158    runPostHook(ctx, "post-back");159}160161pub fn go(ctx: Ctx) !void {162    if (ctx.args.len == 0) return error.Internal;163    const target = std.fmt.parseInt(u32, ctx.args[0], 10) catch return error.Internal;164    const current = try exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine);165166    output.goStart(ctx.machine.name, current, target);167    if (ctx.cfg.confirm and !output.confirm("")) return;168169    const code = try exec.switchGeneration(ctx.io, &ctx.machine, ctx.gpa, target);170    if (code != 0) return error.ProcessFailed;171    output.generationDone(target);172}173174pub fn history(ctx: Ctx) !void {175    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);176    defer ctx.gpa.free(gens);177    output.historyHeader(ctx.machine.name);178    for (gens) |g| output.historyRow(g);179}180181const gen_help = [_][2][]const u8{182    .{ "list", "list generations" },183    .{ "current", "show current generation" },184    .{ "delete <n>", "delete generation n" },185    .{ "delete old", "delete old generations" },186};187188pub fn genCmd(ctx: Ctx) !void {189    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("gen", &gen_help, null);190    if (std.mem.eql(u8, ctx.sub, "list")) return history(ctx);191    if (std.mem.eql(u8, ctx.sub, "current")) {192        const n = try exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine);193        output.genCurrent(n);194        return;195    }196    if (std.mem.eql(u8, ctx.sub, "delete")) {197        if (ctx.args.len == 0) return error.Internal;198        if (std.mem.eql(u8, ctx.args[0], "old")) {199            if (ctx.cfg.confirm and !output.confirm("")) return;200            _ = try exec.deleteOldGenerations(ctx.io, &ctx.machine, ctx.gpa);201        } else {202            const n = std.fmt.parseInt(u32, ctx.args[0], 10) catch return error.Internal;203            if (ctx.cfg.confirm and !output.confirm("")) return;204            _ = try exec.deleteGeneration(ctx.io, &ctx.machine, ctx.gpa, n);205        }206        output.done();207        return;208    }209    return error.Internal;210}211212pub fn clean(ctx: Ctx) !void {213    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);214    defer ctx.gpa.free(gens);215    const all = ctx.all or std.mem.eql(u8, ctx.sub, "all");216    const total: u32 = @intCast(gens.len);217    // `clean all` keeps only the current generation; otherwise keep the configured218    // count. With nothing older than the keep limit, there's nothing to collect.219    const keep: u32 = if (all) 1 else ctx.cfg.generations;220    if (total <= keep) {221        output.cleanNothing(ctx.machine.name, total);222        return;223    }224    output.cleanStart(ctx.machine.name, keep, total);225    if (ctx.cfg.confirm and !output.confirm("removing — cannot be undone")) return;226    _ = try exec.collectGarbage(ctx.io, &ctx.machine, ctx.gpa, all, ctx.cfg.generations);227    output.cleanDone();228}229230pub fn statusCmd(ctx: Ctx) !void {231    output.statusHeader();232    // --all renders every configured machine; remotes route through the same SSH233    // path as exec.capture. An unreachable machine is shown in red, not fatal.234    if (ctx.all and ctx.cfg.machines.len > 0) {235        for (ctx.cfg.machines) |m| statusRowFor(ctx, &m);236    } else {237        statusRowFor(ctx, &ctx.machine);238    }239    homeStatusLine(ctx);240}241242// When standalone Home Manager is present, show its current generation as a dim243// line indented under the machine rows. Gated on standalone mode (the only mode244// where we can read a generation), so a machine without HM is unaffected.245fn homeStatusLine(ctx: Ctx) void {246    if (exec.detectHomeManager(ctx.gpa, ctx.io, ctx.environ) != .standalone) return;247    const out = exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine) catch return;248    defer ctx.gpa.free(out);249    const gens = parseHomeGenerations(ctx.gpa, out) catch return;250    defer freeHomeGens(ctx.gpa, gens);251    if (gens.len == 0) return;252    output.statusHomeRow(gens[0].number, gens[0].date);253}254255fn statusRowFor(ctx: Ctx, machine: *const types.Machine) void {256    // A failure to read the current generation means we couldn't reach or query257    // the machine — mark it unreachable rather than reporting a bogus gen 0.258    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, machine) catch {259        output.statusRow(machine.name, 0, "", "", false);260        return;261    };262    const st = exec.systemStatus(ctx.gpa, ctx.io, machine);263    defer ctx.gpa.free(st.size);264    defer ctx.gpa.free(st.age);265    output.statusRow(machine.name, gen, st.age, st.size, true);266}267268pub fn diff(ctx: Ctx) !void {269    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);270    defer ctx.gpa.free(gens);271    var current: u32 = 0;272    var prev: u32 = 0;273    for (gens) |g| {274        if (g.current) current = g.number;275        if (!g.current and g.number > prev and g.number < current) prev = g.number;276    }277    if (ctx.args.len >= 2) {278        const a = std.fmt.parseInt(u32, ctx.args[0], 10) catch current - 1;279        const b = std.fmt.parseInt(u32, ctx.args[1], 10) catch current;280        output.diffHeader(a, b, ctx.machine.name);281        if (try exec.diffClosures(ctx.io, &ctx.machine, ctx.gpa, a, b) != 0) return error.ProcessFailed;282    } else {283        output.diffHeader(if (prev > 0) prev else current - 1, current, ctx.machine.name);284        if (try exec.diffClosures(ctx.io, &ctx.machine, ctx.gpa, if (prev > 0) prev else current - 1, current) != 0) return error.ProcessFailed;285    }286}287288pub fn mood(ctx: Ctx) !void {289    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine) catch 0;290    const st = exec.systemStatus(ctx.gpa, ctx.io, &ctx.machine);291    defer ctx.gpa.free(st.size);292    defer ctx.gpa.free(st.age);293    const state = exec.systemRunningState(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");294    defer ctx.gpa.free(state);295    output.mood(ctx.machine.name, state, gen, st.age, st.size);296}297298pub fn doctor(ctx: Ctx) !void {299    output.doctorHeader(ctx.machine.name);300    const checks = try exec.runDoctorChecks(ctx.gpa, ctx.io, &ctx.machine);301    defer ctx.gpa.free(checks);302    var warnings: u32 = 0;303    var failures: u32 = 0;304    for (checks) |ch| {305        output.doctorRow(ch);306        if (ch.status == .warn) warnings += 1;307        if (ch.status == .fail) failures += 1;308    }309310    // Home Manager row only when present — absent on a machine without HM, so311    // doctor's table is unchanged there.312    const hm_mode = exec.detectHomeManager(ctx.gpa, ctx.io, ctx.environ);313    if (hm_mode != .none) {314        const note = homeDoctorNote(ctx, hm_mode);315        defer ctx.gpa.free(note);316        output.doctorRow(.{ .name = "home manager", .status = .ok, .note = note });317    }318319    output.doctorSummary(warnings, failures);320}321322// "standalone  gen 765" / "module" — the note shown in doctor's home manager row.323// Caller owns the returned slice.324fn homeDoctorNote(ctx: Ctx, mode: exec.HomeManagerMode) []const u8 {325    const label = switch (mode) {326        .standalone => "standalone",327        .module => "module",328        .none => "",329    };330    if (mode == .standalone) {331        const gen = homeCurrentGen(ctx);332        if (gen != 0)333            return std.fmt.allocPrint(ctx.gpa, "{s}  gen {d}", .{ label, gen }) catch334                (ctx.gpa.dupe(u8, label) catch "");335    }336    return ctx.gpa.dupe(u8, label) catch "";337}338339// nina update — kepr self-update for the nina binary itself.340pub fn update(ctx: Ctx) !void {341    output.updateSelfStart();342343    if (comptime std.mem.eql(u8, version.PLATFORM, "unsupported")) {344        output.updateSelfNoPlatform(@tagName(builtin.cpu.arch) ++ "-" ++ @tagName(builtin.os.tag));345        return error.Internal;346    }347348    const env_url = ctx.environ.get("NINA_UPDATE_SOURCE");349    const source_url = env_url orelse UPDATE_URL;350351    const body = exec.fetchUrl(ctx.gpa, ctx.io, source_url) catch |e| switch (e) {352        error.NetworkError, error.HttpError => {353            output.updateSelfNetworkError();354            return;355        },356        else => return e,357    };358    defer ctx.gpa.free(body);359360    const parsed = std.json.parseFromSlice(std.json.Value, ctx.gpa, body, .{}) catch {361        output.printWarning("could not parse release metadata");362        return;363    };364    defer parsed.deinit();365366    const root = parsed.value;367    if (root != .object) {368        output.printWarning("malformed release metadata");369        return;370    }371372    const remote_ver = blk: {373        const v = root.object.get("version") orelse {374            output.printWarning("malformed release metadata");375            return;376        };377        break :blk switch (v) {378            .string => |s| s,379            else => {380                output.printWarning("malformed release metadata");381                return;382            },383        };384    };385    const release_notes = blk: {386        const v = root.object.get("release_notes") orelse break :blk "";387        break :blk switch (v) {388            .string => |s| s,389            else => "",390        };391    };392393    if (std.mem.eql(u8, remote_ver, version.VERSION)) {394        output.updateSelfCurrent(version.VERSION);395        return;396    }397398    output.updateSelfAvailable(version.VERSION, remote_ver);399    output.updateSelfReleaseNotes(release_notes);400    if (ctx.check) return;401402    var exe_buf: [std.Io.Dir.max_path_bytes]u8 = undefined;403    const install_path = exec.selfExePath(ctx.io, &exe_buf) catch {404        errors.error_info.setMessage("could not determine install path", .{});405        return error.Internal;406    };407408    // When running from the nix store, defer to nix profile upgrade so nix409    // manages the transition (the store is read-only; binary replacement fails).410    // A NixOS system install also resolves into the store but isn't a profile411    // element, so check the profile to avoid a no-op `upgrade` — it updates with412    // the next nixos-rebuild instead.413    if (std.mem.startsWith(u8, install_path, "/nix/store/")) {414        const nina_element = exec.profileNinaElement(ctx.gpa, ctx.io, &ctx.machine);415        defer {416            if (nina_element) |n| ctx.gpa.free(n);417        }418        if (nina_element == null) {419            output.updateSelfNotInProfile();420            return;421        }422        const element = nina_element.?;423        output.updateSelfNixManaged(remote_ver);424        if (ctx.cfg.confirm and !output.confirm("")) return;425        const ec = exec.streamLocal(ctx.io, &.{ "nix", "profile", "upgrade", element }) catch {426            output.updateSelfNixFailed();427            return;428        };429        if (ec != 0) {430            output.updateSelfNixFailed();431            return;432        }433        output.updateSelfDone(version.VERSION, remote_ver);434        return;435    }436437    const plat_info = blk: {438        const pv = root.object.get("platforms") orelse break :blk null;439        if (pv != .object) break :blk null;440        break :blk pv.object.get(version.PLATFORM);441    };442    if (plat_info == null) {443        output.updateSelfNoPlatform(version.PLATFORM);444        return;445    }446447    const dl_url = blk: {448        const v = plat_info.?.object.get("url") orelse {449            output.printWarning("malformed release metadata");450            return;451        };452        break :blk switch (v) {453            .string => |s| s,454            else => {455                output.printWarning("malformed release metadata");456                return;457            },458        };459    };460461    const raw_cksum = blk: {462        if (plat_info.?.object.get("blake3")) |v|463            break :blk switch (v) {464                .string => |s| s,465                else => {466                    output.printWarning("malformed release metadata");467                    return;468                },469            };470        if (plat_info.?.object.get("checksum")) |v|471            break :blk switch (v) {472                .string => |s| s,473                else => {474                    output.printWarning("malformed release metadata");475                    return;476                },477            };478        output.printWarning("missing checksum in release metadata");479        return;480    };481    const expected_hex = if (std.mem.startsWith(u8, raw_cksum, "blake3:")) raw_cksum["blake3:".len..] else raw_cksum;482483    if (ctx.cfg.confirm and !output.confirm("")) return;484485    output.updateSelfDownloading(remote_ver, version.PLATFORM);486    const tmp_path = exec.downloadToTemp(ctx.gpa, ctx.io, dl_url) catch {487        output.printWarning("download failed — check your connection and try again");488        return;489    };490    defer ctx.gpa.free(tmp_path);491492    output.updateSelfVerifying();493    exec.verifyAndInstall(ctx.gpa, ctx.io, tmp_path, expected_hex, install_path) catch |e| switch (e) {494        error.ChecksumMismatch => {495            output.updateSelfChecksumFailed();496            return;497        },498        else => return e,499    };500501    output.updateSelfDone(version.VERSION, remote_ver);502}503504// nina goodbye — clean uninstall. Three install paths:505// - nix profile (binary in nix store with a profile element) → nix profile remove506// - koh build or source build (plain binary on PATH) → delete the file507pub fn goodbye(ctx: Ctx) !void {508    output.goodbyeStart();509510    var exe_buf: [std.Io.Dir.max_path_bytes]u8 = undefined;511    const install_path = exec.selfExePath(ctx.io, &exe_buf) catch {512        errors.error_info.setMessage("could not determine install path", .{});513        return error.Internal;514    };515516    // A binary outside the nix store is a koh build or source build — delete it.517    if (!std.mem.startsWith(u8, install_path, "/nix/store/")) {518        output.goodbyeFile(install_path);519        if (ctx.cfg.confirm and !output.confirm("")) return;520        std.Io.Dir.deleteFileAbsolute(ctx.io, install_path) catch |e| {521            errors.error_info.setMessage("could not remove {s}", .{install_path});522            return e;523        };524        output.goodbyeDone();525        return;526    }527528    // Binary is in the nix store — find and remove the profile element.529    const nina_element = exec.profileNinaElement(ctx.gpa, ctx.io, &ctx.machine);530    defer {531        if (nina_element) |n| ctx.gpa.free(n);532    }533534    if (nina_element == null) {535        errors.error_info.setMessage("nina not found in nix profile — was it installed via 'nix profile add'?", .{});536        return error.Internal;537    }538539    output.goodbyeNix();540    if (ctx.cfg.confirm and !output.confirm("")) return;541    const ec = exec.streamLocal(ctx.io, &.{ "nix", "profile", "remove", nina_element.? }) catch {542        output.goodbyeFailed("nix profile remove failed");543        return;544    };545    if (ec != 0) {546        output.goodbyeFailed("nix profile remove failed");547        return;548    }549    output.goodbyeDone();550}551552fn channelUpdateCmd(ctx: Ctx) !void {553    output.updateStart(ctx.machine.name);554    _ = try exec.channelUpdate(ctx.io, &ctx.machine, ctx.gpa);555    output.updateDone();556}557558pub fn upgrade(ctx: Ctx) !void {559    if (!try runPreHook(ctx, "pre-upgrade")) {560        output.aborted();561        return error.HookAborted;562    }563564    output.upgradeStart(ctx.machine.name);565    // Flake systems update inputs (flake.lock); channel systems update channels.566    // Running nix-channel --update on a flake system is a no-op at best. The567    // rebuild below is already flake-aware via exec.nixosRebuildSwitch.568    if (flakeSystem(ctx)) {569        output.printSubstep("updating flake inputs", .{});570        _ = exec.flakeUpdateAt(ctx.io, &ctx.machine, ctx.gpa, ctx.machine.config_path) catch {};571    } else {572        output.printSubstep("updating channels", .{});573        _ = exec.channelUpdate(ctx.io, &ctx.machine, ctx.gpa) catch {};574    }575    output.printSubstep("rebuilding", .{});576    const start = std.Io.Clock.awake.now(ctx.io);577    const code = try exec.nixosRebuildSwitch(ctx.io, &ctx.machine, ctx.gpa);578    if (code != 0) {579        output.applyFailed("");580        return error.BuildFailed;581    }582    const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());583    const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));584    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine) catch 0;585    output.applyDone(gen, elapsed, false);586    runPostHook(ctx, "post-upgrade");587}588589pub fn log(ctx: Ctx) !void {590    output.logHeader(ctx.machine.name);591    const content = exec.readNinaLog(ctx.gpa, ctx.io, ctx.environ, ctx.last) catch {592        // No log yet — that's fine593        return;594    };595    defer ctx.gpa.free(content);596    var lines = std.mem.splitScalar(u8, content, '\n');597    while (lines.next()) |line| {598        const t = std.mem.trim(u8, line, " \t\r");599        if (t.len == 0) continue;600        if (t[0] == '{') {601            renderJsonLogLine(ctx.gpa, t);602        } else {603            // legacy tab-separated format604            var parts = std.mem.tokenizeScalar(u8, t, '\t');605            const date = parts.next() orelse continue;606            const time = parts.next() orelse "";607            const action = parts.next() orelse "";608            const detail = parts.next() orelse "";609            output.logRow(date, time, action, detail);610        }611    }612}613614// The on-disk log is JSON Lines: {"ts","machine","command","outcome","gen_after",...}.615// Render ts -> date/time columns, command -> action, outcome(+gen) -> detail.616fn renderJsonLogLine(gpa: std.mem.Allocator, line: []const u8) void {617    const parsed = std.json.parseFromSlice(std.json.Value, gpa, line, .{}) catch {618        output.logRow(line, "", "", ""); // unparseable — show raw rather than drop619        return;620    };621    defer parsed.deinit();622    if (parsed.value != .object) return;623    const o = parsed.value.object;624625    const ts = jsonStr(o, "ts");626    const date = if (ts.len >= 10) ts[0..10] else ts;627    const time = if (ts.len >= 16) ts[11..16] else "";628    const action = jsonStr(o, "command");629    const outcome = jsonStr(o, "outcome");630631    var buf: [160]u8 = undefined;632    var detail: []const u8 = outcome;633    if (o.get("gen_after")) |g| {634        if (g == .integer) {635            detail = std.fmt.bufPrint(&buf, "{s}   -> gen {d}", .{ outcome, g.integer }) catch outcome;636        }637    }638    output.logRow(date, time, action, detail);639}640641fn jsonStr(o: std.json.ObjectMap, key: []const u8) []const u8 {642    if (o.get(key)) |v| {643        if (v == .string) return v.string;644    }645    return "";646}647648pub fn edit(ctx: Ctx) !void {649    const hardware = ctx.args.len > 0 and std.mem.eql(u8, ctx.args[0], "hardware");650    const filename = if (hardware) "hardware-configuration.nix" else "configuration.nix";651    const path = try std.fmt.allocPrint(ctx.gpa, "{s}/{s}", .{ ctx.machine.config_path, filename });652    defer ctx.gpa.free(path);653    output.editOpen(path, ctx.cfg.editor);654    _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, path, null);655}656657pub fn fmt(ctx: Ctx) !void {658    const path = try std.fmt.allocPrint(ctx.gpa, "{s}/configuration.nix", .{ctx.machine.config_path});659    defer ctx.gpa.free(path);660    if (ctx.check) {661        const code = try exec.nixpkgsFmt(ctx.io, &ctx.machine, ctx.gpa, path, true);662        if (code != 0) output.fmtNeedsFormat() else output.fmtDone();663        return;664    }665    output.fmtStart(path);666    _ = try exec.nixpkgsFmt(ctx.io, &ctx.machine, ctx.gpa, path, false);667    output.fmtDone();668}669670pub fn repl(ctx: Ctx) !void {671    output.replStart();672    _ = try exec.nixRepl(ctx.io, &ctx.machine, ctx.gpa);673}674675pub fn develop(ctx: Ctx) !void {676    if (std.mem.eql(u8, ctx.sub, "show")) {677        _ = try exec.nixBuild(ctx.io, &ctx.machine, ctx.gpa, null);678        return;679    }680    const run_cmd: ?[]const u8 = if (ctx.args.len > 0 and std.mem.eql(u8, ctx.sub, "run"))681        ctx.args[0]682    else683        null;684    output.developStart(&.{});685    _ = try exec.nixDevelopPs1(ctx.io, &ctx.machine, ctx.gpa, run_cmd, ctx.environ);686    output.developDone();687}688689pub fn info(ctx: Ctx) !void {690    output.infoHeader(ctx.machine.name);691    const nixos_ver = exec.systemInfo(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");692    defer ctx.gpa.free(nixos_ver);693    output.infoRow("nixos", std.mem.trim(u8, nixos_ver, " \t\n\r"));694695    const kernel = exec.kernelInfo(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");696    defer ctx.gpa.free(kernel);697    output.infoRow("kernel", std.mem.trim(u8, kernel, " \t\n\r"));698699    const uptime = exec.uptimeInfo(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");700    defer ctx.gpa.free(uptime);701    output.infoRow("uptime", std.mem.trim(u8, uptime, " \t\n\r"));702}703704pub fn boot(ctx: Ctx) !void {705    output.bootHeader(ctx.machine.name);706    const entries = exec.bootEntries(ctx.gpa, ctx.io, &ctx.machine) catch &.{};707    defer ctx.gpa.free(entries);708    for (entries, 0..) |entry, i| output.bootEntry(entry, i);709}710711pub fn searchCmd(ctx: Ctx) !void {712    const query = if (ctx.args.len > 0) ctx.args[0] else "";713    api.ensureRegistryPinned(ctx.gpa, ctx.io, ctx.environ);714    const selected = try search_tui.run(ctx.gpa, ctx.io, query, .packages);715    if (selected) |npkg| try selectAndInstall(ctx, npkg);716}717718pub fn optionCmd(ctx: Ctx) !void {719    const query = if (ctx.args.len > 0) ctx.args[0] else "";720    api.ensureRegistryPinned(ctx.gpa, ctx.io, ctx.environ);721    _ = try search_tui.run(ctx.gpa, ctx.io, query, .options);722}723724pub fn install(ctx: Ctx) !void {725    const pkg_name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;726727    api.ensureRegistryPinned(ctx.gpa, ctx.io, ctx.environ);728729    // Search for the package to get the attr730    const pkgs = api.searchPackages(ctx.gpa, ctx.io, pkg_name) catch {731        errors.error_info.setMessage("'{s}' not found in nixpkgs", .{pkg_name});732        errors.error_info.setSuggestion("nina search {s}", .{pkg_name});733        return error.PackageNotFound;734    };735736    if (pkgs.len == 0) {737        // No matches — likely a typo. Suggest the closest real package and offer it.738        if (closestPackage(ctx, pkg_name)) |sugg| {739            output.didYouMean(pkg_name, sugg.pname);740            if (output.confirm("")) try selectAndInstall(ctx, sugg);741            return;742        }743        errors.error_info.setMessage("'{s}' not found in nixpkgs", .{pkg_name});744        errors.error_info.setSuggestion("nina search {s}", .{pkg_name});745        return error.PackageNotFound;746    }747748    // Prefer an exact name match over the first search result — `install ripgrep`749    // must pick "ripgrep", not the alphabetically-first match like "repgrep".750    var found = pkgs[0];751    for (pkgs) |p| {752        if (std.mem.eql(u8, p.pname, pkg_name)) {753            found = p;754            break;755        }756    }757    try selectAndInstall(ctx, found);758}759760// Find the real package whose name is closest to a not-found query (typo help).761// Typos usually keep the leading characters, so gather candidates with a prefix762// search and rank by edit distance; return the best only if it's typo-close.763fn closestPackage(ctx: Ctx, query: []const u8) ?types.NixPackage {764    if (query.len < 2) return null;765    var candidates = api.searchPackages(ctx.gpa, ctx.io, query[0..@min(query.len, 4)]) catch &.{};766    if (candidates.len == 0 and query.len > 2) {767        candidates = api.searchPackages(ctx.gpa, ctx.io, query[0..2]) catch &.{};768    }769    if (candidates.len == 0) return null;770771    var best: ?types.NixPackage = null;772    var best_dist: usize = std.math.maxInt(usize);773    for (candidates) |p| {774        const d = editDistance(query, p.pname);775        if (d > 0 and d < best_dist) {776            best_dist = d;777            best = p;778        }779    }780    // Only suggest a genuinely close name, scaled to query length.781    const threshold = @max(@as(usize, 2), query.len / 3);782    return if (best_dist <= threshold) best else null;783}784785// Case-insensitive Levenshtein distance. Names longer than the row buffer are786// treated as far away (never suggested).787fn editDistance(a: []const u8, b: []const u8) usize {788    const n = b.len;789    if (a.len == 0) return n;790    if (n == 0) return a.len;791    if (n + 1 > 128) return std.math.maxInt(usize);792    var prev: [128]usize = undefined;793    var curr: [128]usize = undefined;794    var j: usize = 0;795    while (j <= n) : (j += 1) prev[j] = j;796    var i: usize = 1;797    while (i <= a.len) : (i += 1) {798        curr[0] = i;799        j = 1;800        while (j <= n) : (j += 1) {801            const cost: usize = if (std.ascii.toLower(a[i - 1]) == std.ascii.toLower(b[j - 1])) 0 else 1;802            curr[j] = @min(prev[j] + 1, @min(curr[j - 1] + 1, prev[j - 1] + cost));803        }804        @memcpy(prev[0 .. n + 1], curr[0 .. n + 1]);805    }806    return prev[n];807}808809test "editDistance is case-insensitive Levenshtein" {810    try std.testing.expectEqual(@as(usize, 1), editDistance("firefux", "firefox"));811    try std.testing.expectEqual(@as(usize, 0), editDistance("git", "GIT"));812    try std.testing.expectEqual(@as(usize, 2), editDistance("fierfox", "firefox"));813    try std.testing.expectEqual(@as(usize, 7), editDistance("", "firefox"));814}815816// Prompt for the install method (profile / system / try) and dispatch. Shared by817// `nina install <pkg>` and the search widget's Enter-to-select — the letter keys818// are read here, after the search widget's raw mode is gone, so they don't819// collide with typing a query.820fn selectAndInstall(ctx: Ctx, npkg: types.NixPackage) !void {821    output.installSelectPrompt(npkg.pname, npkg.version);822823    var choice_buf: [8]u8 = undefined;824    var choice_len: usize = 0;825    while (choice_len < choice_buf.len) {826        const n = std.posix.read(std.posix.STDIN_FILENO, choice_buf[choice_len .. choice_len + 1]) catch break;827        if (n == 0) break;828        if (choice_buf[choice_len] == '\n') break;829        choice_len += 1;830    }831    const choice = std.mem.trim(u8, choice_buf[0..choice_len], " \t");832833    if (choice.len == 0 or choice[0] == 'i' or choice[0] == 'I') {834        try profileInstallPkg(ctx, npkg);835    } else if (choice[0] == 's' or choice[0] == 'S') {836        try systemInstallPkg(ctx, npkg);837    } else if (choice[0] == 't' or choice[0] == 'T') {838        try tryPkg(ctx, npkg);839    }840}841842fn profileInstallPkg(ctx: Ctx, npkg: types.NixPackage) !void {843    output.installStart(npkg.pname, .profile);844    output.printSubstep("nix profile add nixpkgs#{s}", .{npkg.attr});845    output.printTeach(try std.fmt.allocPrint(ctx.gpa, "nix profile add nixpkgs#{s}", .{npkg.attr}));846    const code = try exec.profileInstall(ctx.io, &ctx.machine, ctx.gpa, npkg.attr);847    if (code != 0) return error.ProcessFailed;848    output.installDone(npkg.pname);849}850851fn systemInstallPkg(ctx: Ctx, npkg: types.NixPackage) !void {852    const config_path = try std.fmt.allocPrint(ctx.gpa, "{s}/configuration.nix", .{ctx.machine.config_path});853    defer ctx.gpa.free(config_path);854    const line = api.findSystemPackagesLine(ctx.io, config_path) orelse 1;855    output.installEditorPrompt(npkg.pname, config_path, line, ctx.cfg.editor);856    _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, config_path, line);857    if (ctx.cfg.confirm) {858        if (output.confirm("apply now? ")) {859            try apply(ctx);860        }861    }862}863864fn tryPkg(ctx: Ctx, npkg: types.NixPackage) !void {865    output.tryStart(npkg.pname);866    output.printSubstep("nix shell nixpkgs#{s}", .{npkg.attr});867    output.tryExitHint();868    _ = try exec.nixShellPs1(ctx.io, &ctx.machine, ctx.gpa, npkg.attr, ctx.environ);869    output.tryDone();870}871872pub fn remove(ctx: Ctx) !void {873    const pkg_name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;874    output.removeStart(pkg_name);875    const code = try exec.profileRemove(ctx.io, &ctx.machine, ctx.gpa, pkg_name);876    if (code != 0) return error.ProcessFailed;877    output.done();878}879880pub fn list(ctx: Ctx) !void {881    output.listHeader(ctx.machine.name);882883    // Profile packages: parse `nix profile list --json` into clean name+version884    // rows instead of dumping nix's verbose multi-line "Name:/Flake attribute:"885    // blocks.886    if (exec.profileListJson(ctx.gpa, ctx.io, &ctx.machine) catch null) |json| {887        defer ctx.gpa.free(json);888        output.listSection("profile");889        renderProfileJson(ctx.gpa, json);890    }891892    // System packages: the references of /run/current-system/sw, each a893    // <hash>-<name>-<version> store path.894    if (exec.systemPackagePaths(ctx.gpa, ctx.io, &ctx.machine) catch null) |paths| {895        defer ctx.gpa.free(paths);896        output.blankLine();897        output.listSection("system");898        var lines = std.mem.splitScalar(u8, paths, '\n');899        while (lines.next()) |line| {900            const t = std.mem.trim(u8, line, " \t\r");901            if (t.len == 0) continue;902            const row = pkgFromStorePath(t);903            // Skip support paths with no parseable version (man pages, wrappers).904            if (row.version.len == 0) continue;905            output.listPkg(row.name, row.version);906        }907    }908}909910const PkgRow = struct { name: []const u8, version: []const u8 };911912// Split a nix store path basename (<hash>-<name>-<version>) into name + version.913// Version begins at the first '-' followed by a digit, which reliably lands on914// the name/version boundary since the 32-char hash and package names start with915// non-digits.916fn pkgFromStorePath(path: []const u8) PkgRow {917    const base = std.fs.path.basename(path);918    const after_hash = if (base.len > 33 and base[32] == '-') base[33..] else base;919    var i: usize = 0;920    while (i + 1 < after_hash.len) : (i += 1) {921        if (after_hash[i] == '-' and std.ascii.isDigit(after_hash[i + 1])) {922            return .{ .name = after_hash[0..i], .version = stripOutputSuffix(after_hash[i + 1 ..]) };923        }924    }925    return .{ .name = after_hash, .version = "" };926}927928// Multi-output derivations append the output name to the store path (e.g.929// curl-8.20.0-bin, less-692-man). Strip that suffix so the version column reads930// as just the version.931fn stripOutputSuffix(ver: []const u8) []const u8 {932    const suffixes = [_][]const u8{ "-bin", "-man", "-dev", "-doc", "-lib", "-info", "-out", "-static", "-devdoc" };933    for (suffixes) |s| {934        if (std.mem.endsWith(u8, ver, s)) return ver[0 .. ver.len - s.len];935    }936    return ver;937}938939test "pkgFromStorePath splits name and version at first dash-digit" {940    const a = pkgFromStorePath("/nix/store/abcdefghijklmnopqrstuvwxyz012345-ripgrep-15.1.0");941    try std.testing.expectEqualStrings("ripgrep", a.name);942    try std.testing.expectEqualStrings("15.1.0", a.version);943944    const b = pkgFromStorePath("/nix/store/abcdefghijklmnopqrstuvwxyz012345-helix-25.01");945    try std.testing.expectEqualStrings("helix", b.name);946    try std.testing.expectEqualStrings("25.01", b.version);947948    // multi-output store paths drop their output-name suffix949    const c = pkgFromStorePath("/nix/store/abcdefghijklmnopqrstuvwxyz012345-curl-8.20.0-bin");950    try std.testing.expectEqualStrings("curl", c.name);951    try std.testing.expectEqualStrings("8.20.0", c.version);952}953954fn firstStorePath(el: std.json.Value) ?[]const u8 {955    if (el != .object) return null;956    const sp = el.object.get("storePaths") orelse return null;957    if (sp != .array or sp.array.items.len == 0) return null;958    const first = sp.array.items[0];959    return if (first == .string) first.string else null;960}961962// `nix profile list --json` has two shapes across nix versions: newer keys each963// element by name (object), older lists them positionally (array). Handle both.964fn renderProfileJson(gpa: std.mem.Allocator, json: []const u8) void {965    const parsed = std.json.parseFromSlice(std.json.Value, gpa, json, .{}) catch return;966    defer parsed.deinit();967    if (parsed.value != .object) return;968    const elements = parsed.value.object.get("elements") orelse return;969    switch (elements) {970        .object => |obj| {971            var it = obj.iterator();972            while (it.next()) |entry| {973                const ver = if (firstStorePath(entry.value_ptr.*)) |p| pkgFromStorePath(p).version else "";974                output.listPkg(entry.key_ptr.*, ver);975            }976        },977        .array => |arr| {978            for (arr.items) |el| {979                const path = firstStorePath(el) orelse continue;980                const row = pkgFromStorePath(path);981                output.listPkg(row.name, row.version);982            }983        },984        else => {},985    }986}987988pub fn tryCmd(ctx: Ctx) !void {989    const pkg_name_arg = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;990    const shell_pkg = types.NixPackage{ .attr = pkg_name_arg, .pname = pkg_name_arg, .version = "", .description = "" };991    try tryPkg(ctx, shell_pkg);992}993994// --- Home Manager commands ---995996const home_help = [_][2][]const u8{997    .{ "apply", "apply home-manager configuration" },998    .{ "apply --dry", "preview changes without activating" },999    .{ "back", "roll back one generation" },1000    .{ "history", "list all generations" },1001    .{ "edit", "open home.nix" },1002    .{ "check", "validate without applying" },1003    .{ "diff", "compare the latest two generations" },1004    .{ "packages", "list managed packages" },1005};10061007const HomeGen = struct {1008    number: u32,1009    date: []const u8,1010    time: []const u8,1011    path: []const u8,1012};10131014// `home-manager generations` lines read:1015//   2026-06-01 11:56 : id 765 -> /nix/store/<hash>-home-manager-generation1016// Newest first, so index 0 is the current generation.1017fn parseHomeGenerations(gpa: std.mem.Allocator, out_str: []const u8) ![]HomeGen {1018    var gens: std.ArrayList(HomeGen) = .empty;1019    var lines = std.mem.splitScalar(u8, out_str, '\n');1020    while (lines.next()) |line| {1021        const t = std.mem.trim(u8, line, " \t\r");1022        if (t.len == 0) continue;1023        var it = std.mem.tokenizeAny(u8, t, " \t");1024        const date = it.next() orelse continue;1025        const time = it.next() orelse continue;1026        var number: ?u32 = null;1027        var path: []const u8 = "";1028        while (it.next()) |tok| {1029            if (std.mem.eql(u8, tok, "id")) {1030                if (it.next()) |n| number = std.fmt.parseInt(u32, n, 10) catch null;1031            } else if (std.mem.startsWith(u8, tok, "/nix/store/")) {1032                path = tok;1033            }1034        }1035        const num = number orelse continue;1036        try gens.append(gpa, .{1037            .number = num,1038            .date = try gpa.dupe(u8, date),1039            .time = try gpa.dupe(u8, time),1040            .path = try gpa.dupe(u8, path),1041        });1042    }1043    return gens.toOwnedSlice(gpa);1044}10451046fn freeHomeGens(gpa: std.mem.Allocator, gens: []HomeGen) void {1047    for (gens) |g| {1048        gpa.free(g.date);1049        gpa.free(g.time);1050        gpa.free(g.path);1051    }1052    gpa.free(gens);1053}10541055test "parseHomeGenerations reads id, date and store path" {1056    const a = std.testing.allocator;1057    const sample =1058        \\2026-06-01 11:56 : id 765 -> /nix/store/aaaa-home-manager-generation1059        \\2026-05-31 10:29 : id 764 -> /nix/store/bbbb-home-manager-generation1060    ;1061    const gens = try parseHomeGenerations(a, sample);1062    defer freeHomeGens(a, gens);1063    try std.testing.expectEqual(@as(usize, 2), gens.len);1064    try std.testing.expectEqual(@as(u32, 765), gens[0].number);1065    try std.testing.expectEqualStrings("2026-06-01", gens[0].date);1066    try std.testing.expectEqualStrings("11:56", gens[0].time);1067    try std.testing.expectEqualStrings("/nix/store/aaaa-home-manager-generation", gens[0].path);1068    try std.testing.expectEqual(@as(u32, 764), gens[1].number);1069}10701071// Current (newest) home generation number, or 0 if unavailable.1072fn homeCurrentGen(ctx: Ctx) u32 {1073    const out = exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine) catch return 0;1074    defer ctx.gpa.free(out);1075    const gens = parseHomeGenerations(ctx.gpa, out) catch return 0;1076    defer freeHomeGens(ctx.gpa, gens);1077    return if (gens.len > 0) gens[0].number else 0;1078}10791080pub fn home(ctx: Ctx) !void {1081    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help"))1082        return output.subcommandHelp("home", &home_help, null);10831084    // Home Manager manages the local user's environment. Detection (which binary,1085    // ~/.config/home-manager, $HOME/$USER for the flake ref) all read the LOCAL1086    // host, while exec routes over SSH for a remote machine — so `home --on1087    // <remote>` would decide mode/flake-ref from the wrong box. Refuse it cleanly1088    // rather than acting on a mismatch.1089    if (!ctx.machine.local) {1090        output.homeLocalOnly(ctx.machine.name);1091        return;1092    }10931094    const mode = exec.detectHomeManager(ctx.gpa, ctx.io, ctx.environ);1095    if (mode == .none) {1096        output.homeNotInstalled();1097        return;1098    }10991100    // apply is the only command meaningful in module mode (it redirects to1101    // `nina apply`); everything else needs the standalone home-manager CLI.1102    if (std.mem.eql(u8, ctx.sub, "apply")) return homeApply(ctx, mode);1103    // edit just opens the local home.nix — fine in module mode too.1104    if (std.mem.eql(u8, ctx.sub, "edit")) return homeEdit(ctx);11051106    if (mode == .module) {1107        output.homeModuleManaged();1108        return;1109    }11101111    if (std.mem.eql(u8, ctx.sub, "back")) return homeBack(ctx);1112    if (std.mem.eql(u8, ctx.sub, "history")) return homeHistory(ctx);1113    if (std.mem.eql(u8, ctx.sub, "check")) return homeCheck(ctx);1114    if (std.mem.eql(u8, ctx.sub, "diff")) return homeDiff(ctx);1115    if (std.mem.eql(u8, ctx.sub, "packages")) return homePackages(ctx);11161117    return output.subcommandHelp("home", &home_help, null);1118}11191120fn homePackages(ctx: Ctx) !void {1121    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1122    defer ctx.gpa.free(out);1123    const gens = try parseHomeGenerations(ctx.gpa, out);1124    defer freeHomeGens(ctx.gpa, gens);11251126    output.homePackagesHeader(ctx.machine.name);1127    if (gens.len == 0 or gens[0].path.len == 0) return;11281129    // The generation's OWN references are home-manager's activation deps1130    // (bash, coreutils, ...), not what the user installed. The user's packages1131    // live one level down, in the `…-home-manager-path` env the generation1132    // references — descend into it and list ITS references. Fall back to the1133    // generation refs if that env isn't present (older home-manager layouts).1134    const gen_refs = exec.homeGenerationReferences(ctx.gpa, ctx.io, &ctx.machine, gens[0].path) catch return;1135    defer ctx.gpa.free(gen_refs);11361137    var refs = gen_refs;1138    var env_refs: ?[]u8 = null;1139    defer if (env_refs) |e| ctx.gpa.free(e);1140    if (findHomeManagerPath(gen_refs)) |pkg_path| {1141        if (exec.homeGenerationReferences(ctx.gpa, ctx.io, &ctx.machine, pkg_path)) |e| {1142            env_refs = e;1143            refs = e;1144        } else |_| {}1145    }11461147    // Dedup by name: multi-output derivations (jq, jq-lib, jq-doc) collapse to1148    // the same name after the output suffix is stripped. Keys are slices into1149    // `refs`, valid for this function's lifetime.1150    var seen = std.StringHashMap(void).init(ctx.gpa);1151    defer seen.deinit();1152    var lines = std.mem.splitScalar(u8, refs, '\n');1153    while (lines.next()) |line| {1154        const t = std.mem.trim(u8, line, " \t\r");1155        if (t.len == 0) continue;1156        const row = pkgFromStorePath(t);1157        if (row.version.len == 0) continue;1158        if (std.mem.indexOf(u8, row.name, "home-manager") != null) continue;1159        if (seen.contains(row.name)) continue;1160        seen.put(row.name, {}) catch {};1161        output.listPkg(row.name, row.version);1162    }1163}11641165// The `…-home-manager-path` env among a generation's references — the buildEnv1166// of the user's home.packages. Returns the full store-path line, or null.1167fn findHomeManagerPath(refs: []const u8) ?[]const u8 {1168    var lines = std.mem.splitScalar(u8, refs, '\n');1169    while (lines.next()) |line| {1170        const t = std.mem.trim(u8, line, " \t\r");1171        if (std.mem.indexOf(u8, t, "home-manager-path") != null) return t;1172    }1173    return null;1174}11751176test "findHomeManagerPath picks the env, not the generation or infra" {1177    const refs =1178        \\/nix/store/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-bash-5.31179        \\/nix/store/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb-home-manager-path1180        \\/nix/store/cccccccccccccccccccccccccccccccc-coreutils-9.111181    ;1182    try std.testing.expectEqualStrings(1183        "/nix/store/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb-home-manager-path",1184        findHomeManagerPath(refs).?,1185    );1186    try std.testing.expectEqual(@as(?[]const u8, null), findHomeManagerPath("/nix/store/x-bash-5.3\n"));1187}11881189fn homeDiff(ctx: Ctx) !void {1190    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1191    defer ctx.gpa.free(out);1192    const gens = try parseHomeGenerations(ctx.gpa, out);1193    defer freeHomeGens(ctx.gpa, gens);11941195    // Need two generations and both their store paths to diff their closures.1196    if (gens.len < 2 or gens[0].path.len == 0 or gens[1].path.len == 0) {1197        output.homeNothingToDiff();1198        return;1199    }1200    const newer = gens[0];1201    const older = gens[1];1202    output.homeDiffHeader(older.number, newer.number, ctx.machine.name);1203    if (try exec.diffClosuresPaths(ctx.io, &ctx.machine, ctx.gpa, older.path, newer.path) != 0)1204        return error.ProcessFailed;1205}12061207fn homeCheck(ctx: Ctx) !void {1208    output.homeCheckStart(ctx.machine.name);1209    const code = try exec.homeManagerBuild(ctx.io, &ctx.machine, ctx.gpa);1210    if (code != 0) return error.BuildFailed;1211    output.homeCheckOk();1212}12131214fn homeEdit(ctx: Ctx) !void {1215    // Standalone home config lives at ~/.config/home-manager/home.nix; the same1216    // path is what detection keys on for module mode, so it resolves for both.1217    const path = exec.homeNixPath(ctx.gpa, ctx.environ) orelse {1218        errors.error_info.setMessage("could not resolve ~/.config/home-manager/home.nix", .{});1219        return error.ConfigNotFound;1220    };1221    defer ctx.gpa.free(path);1222    output.homeEditOpen(path, ctx.cfg.editor);1223    _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, path, null);1224}12251226fn homeHistory(ctx: Ctx) !void {1227    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1228    defer ctx.gpa.free(out);1229    const gens = try parseHomeGenerations(ctx.gpa, out);1230    defer freeHomeGens(ctx.gpa, gens);1231    output.homeHistoryHeader(ctx.machine.name);1232    // Newest-first from home-manager; the first row is the current generation.1233    for (gens, 0..) |g, i| output.homeHistoryRow(g.number, g.date, g.time, i == 0);1234}12351236fn homeBack(ctx: Ctx) !void {1237    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1238    defer ctx.gpa.free(out);1239    const gens = try parseHomeGenerations(ctx.gpa, out);1240    defer freeHomeGens(ctx.gpa, gens);12411242    // Newest-first: [0] is current, [1] is the generation to roll back to.1243    if (gens.len < 2) {1244        output.alreadyOldest();1245        return;1246    }1247    const current = gens[0].number;1248    const prev = gens[1].number;12491250    output.homeBackStart(ctx.machine.name, current, prev);1251    if (ctx.cfg.confirm and !output.confirm("")) return;1252    const code = try exec.homeManagerRollback(ctx.io, &ctx.machine, ctx.gpa);1253    if (code != 0) return error.BuildFailed;1254    output.homeBackDone(prev);1255}12561257fn homeApply(ctx: Ctx, mode: exec.HomeManagerMode) !void {1258    // NixOS/flake module: home config is rebuilt by nixos-rebuild — redirect.1259    if (mode == .module) {1260        output.homeModuleManaged();1261        return;1262    }1263    if (ctx.dry) {1264        output.homeApplyDry(ctx.machine.name);1265        const code = try exec.homeManagerBuild(ctx.io, &ctx.machine, ctx.gpa);1266        if (code != 0) return error.BuildFailed;1267        output.homeApplyDryDone();1268        return;1269    }12701271    if (!try runPreHook(ctx, "pre-home")) {1272        output.aborted();1273        return error.HookAborted;1274    }12751276    output.homeApplyStart(ctx.machine.name);1277    const flake_ref = exec.homeFlakeRef(ctx.gpa, ctx.io, ctx.environ);1278    defer if (flake_ref) |r| ctx.gpa.free(r);1279    if (flake_ref) |ref| {1280        output.printSubstep("home-manager switch --flake {s}", .{ref});1281    } else {1282        output.printSubstep("home-manager switch", .{});1283    }12841285    const start = std.Io.Clock.awake.now(ctx.io);1286    const code = if (flake_ref) |ref|1287        try exec.homeManagerSwitchFlake(ctx.io, &ctx.machine, ctx.gpa, ref)1288    else1289        try exec.homeManagerSwitch(ctx.io, &ctx.machine, ctx.gpa);1290    if (code != 0) return error.BuildFailed;12911292    const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());1293    const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));1294    output.homeApplyDone(homeCurrentGen(ctx), elapsed);1295    runPostHook(ctx, "post-home");1296}12971298// --- Service commands ---12991300const service_help = [_][2][]const u8{1301    .{ "list", "list running services" },1302    .{ "logs <svc>", "show service logs" },1303    .{ "status <svc>", "service status" },1304    .{ "start <svc>", "start a service" },1305    .{ "stop <svc>", "stop a service" },1306    .{ "restart <svc>", "restart a service" },1307    .{ "enable <svc>", "enable at boot" },1308    .{ "disable <svc>", "disable at boot" },1309};13101311pub fn service(ctx: Ctx) !void {1312    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");1313    if (std.mem.eql(u8, ctx.sub, "list")) {1314        output.serviceListHeader(ctx.machine.name);1315        const svcs = exec.serviceList(ctx.gpa, ctx.io, &ctx.machine, ctx.user) catch &.{};1316        defer ctx.gpa.free(svcs);1317        for (svcs) |s| output.serviceRow(s);1318        return;1319    }1320    if (std.mem.eql(u8, ctx.sub, "logs")) {1321        const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1322        const follow = ctx.args.len > 1 and std.mem.eql(u8, ctx.args[1], "-f");1323        output.serviceLogsHeader(name, ctx.last, ctx.machine.name);1324        _ = try exec.serviceLogs(ctx.io, &ctx.machine, ctx.gpa, name, ctx.last, follow, ctx.user);1325        return;1326    }1327    if (std.mem.eql(u8, ctx.sub, "status")) {1328        const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1329        output.serviceVerb("status", name, ctx.machine.name);1330        _ = try exec.serviceCtl(ctx.io, &ctx.machine, ctx.gpa, "status", name, ctx.user);1331        return;1332    }1333    // start/stop/restart/enable/disable1334    const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1335    if (ctx.cfg.confirm and (std.mem.eql(u8, ctx.sub, "stop") or std.mem.eql(u8, ctx.sub, "disable"))) {1336        if (!output.confirm("")) return;1337    }1338    output.serviceVerb(ctx.sub, name, ctx.machine.name);1339    _ = try exec.serviceCtl(ctx.io, &ctx.machine, ctx.gpa, ctx.sub, name, ctx.user);1340    output.serviceDone();1341}13421343// --- Flake commands ---13441345const flake_help = [_][2][]const u8{1346    .{ "init", "create a new flake.nix" },1347    .{ "update", "update flake inputs" },1348    .{ "update <in>", "update a specific input" },1349    .{ "check", "validate the flake" },1350    .{ "show", "inspect flake outputs" },1351    .{ "lock", "regenerate flake.lock" },1352    .{ "clone <url>", "clone a flake repository" },1353};13541355pub fn flake(ctx: Ctx) !void {1356    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("flake", &flake_help, null);1357    if (std.mem.eql(u8, ctx.sub, "update")) {1358        output.flakeUpdateStart();1359        const input: ?[]const u8 = if (ctx.args.len > 0) ctx.args[0] else null;1360        _ = try exec.flakeUpdate(ctx.io, &ctx.machine, ctx.gpa, input);1361        output.flakeLockWritten();1362        return;1363    }1364    if (std.mem.eql(u8, ctx.sub, "check")) {1365        output.flakeCheckStart();1366        const code = try exec.flakeCheck(ctx.io, &ctx.machine, ctx.gpa);1367        if (code == 0) output.flakeValid() else output.checkFailed("");1368        return;1369    }1370    if (std.mem.eql(u8, ctx.sub, "show")) {1371        const json_out = exec.flakeShow(ctx.gpa, ctx.io, &ctx.machine) catch null;1372        if (json_out) |j| {1373            defer ctx.gpa.free(j);1374            output.flakeShowHeader("flake outputs");1375            // Parse and display the flake outputs1376            const parsed = std.json.parseFromSlice(std.json.Value, ctx.gpa, j, .{}) catch return;1377            defer parsed.deinit();1378            if (parsed.value == .object) {1379                var it = parsed.value.object.iterator();1380                while (it.next()) |entry| {1381                    if (entry.value_ptr.* == .object) {1382                        var inner = entry.value_ptr.object.iterator();1383                        while (inner.next()) |e2| {1384                            const desc = if (e2.value_ptr.* == .object)1385                                if (e2.value_ptr.object.get("description")) |d|1386                                    if (d == .string) d.string else ""1387                                else1388                                    ""1389                            else1390                                "";1391                            output.flakeShowEntry(entry.key_ptr.*, e2.key_ptr.*, desc);1392                        }1393                    }1394                }1395            }1396        }1397        return;1398    }1399    if (std.mem.eql(u8, ctx.sub, "init")) {1400        _ = try exec.flakeInit(ctx.io, &ctx.machine, ctx.gpa);1401        return;1402    }1403    if (std.mem.eql(u8, ctx.sub, "lock")) {1404        _ = try exec.flakeLock(ctx.io, &ctx.machine, ctx.gpa);1405        return;1406    }1407    if (std.mem.eql(u8, ctx.sub, "clone")) {1408        const url = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1409        _ = try exec.flakeClone(ctx.io, &ctx.machine, ctx.gpa, url);1410        return;1411    }1412}14131414// --- Store commands ---14151416const store_help = [_][2][]const u8{1417    .{ "info", "store size and counts" },1418    .{ "path <attr>", "store path of a package" },1419    .{ "gc", "collect garbage" },1420    .{ "verify", "verify store integrity" },1421    .{ "repair", "repair corrupted paths" },1422};14231424pub fn store(ctx: Ctx) !void {1425    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("store", &store_help, null);1426    if (std.mem.eql(u8, ctx.sub, "gc")) {1427        _ = try exec.storeGc(ctx.io, &ctx.machine, ctx.gpa);1428        return;1429    }1430    if (std.mem.eql(u8, ctx.sub, "verify")) {1431        output.storeVerifyStart();1432        _ = try exec.storeVerify(ctx.io, &ctx.machine, ctx.gpa);1433        return;1434    }1435    if (std.mem.eql(u8, ctx.sub, "repair")) {1436        if (ctx.cfg.confirm and !output.confirm("")) return;1437        output.storeRepairStart();1438        _ = try exec.storeRepair(ctx.io, &ctx.machine, ctx.gpa);1439        return;1440    }1441    if (std.mem.eql(u8, ctx.sub, "info")) {1442        const si = try exec.storeInfo(ctx.gpa, ctx.io, &ctx.machine);1443        output.storeInfo(si);1444        return;1445    }1446    if (std.mem.eql(u8, ctx.sub, "path")) {1447        const attr = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1448        const path = try exec.storePath(ctx.gpa, ctx.io, &ctx.machine, attr);1449        defer ctx.gpa.free(path);1450        output.storePath(path);1451        return;1452    }1453    // default: info1454    const si = try exec.storeInfo(ctx.gpa, ctx.io, &ctx.machine);1455    output.storeInfo(si);1456}14571458// --- Channel commands ---14591460const channel_help = [_][2][]const u8{1461    .{ "list", "list channels" },1462    .{ "add <url> [name]", "add a channel" },1463    .{ "remove <name>", "remove a channel" },1464    .{ "update", "update all channels" },1465};14661467pub fn channel(ctx: Ctx) !void {1468    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("channel", &channel_help, null);1469    // On a flake-managed system, nix-channel operations generally don't apply.1470    if (flakeSystem(ctx)) output.flakeChannelNote();1471    if (std.mem.eql(u8, ctx.sub, "list")) {1472        output.channelListHeader(ctx.machine.name);1473        const chans = try exec.channelList(ctx.gpa, ctx.io, &ctx.machine);1474        defer ctx.gpa.free(chans);1475        for (chans) |ch| output.channelRow(ch);1476        return;1477    }1478    if (std.mem.eql(u8, ctx.sub, "add")) {1479        const url = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1480        const name = if (ctx.args.len > 1) ctx.args[1] else "";1481        _ = try exec.channelAdd(ctx.io, &ctx.machine, ctx.gpa, url, name);1482        output.channelDone();1483        return;1484    }1485    if (std.mem.eql(u8, ctx.sub, "remove")) {1486        const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1487        _ = try exec.channelRemove(ctx.io, &ctx.machine, ctx.gpa, name);1488        output.channelDone();1489        return;1490    }1491    if (std.mem.eql(u8, ctx.sub, "update")) {1492        return channelUpdateCmd(ctx);1493    }1494}14951496// --- Profile commands ---14971498pub fn profile(ctx: Ctx) !void {1499    if (std.mem.eql(u8, ctx.sub, "list") or ctx.sub.len == 0) {1500        output.profileListHeader();1501        const out = exec.profileList(ctx.gpa, ctx.io, &ctx.machine) catch null;1502        if (out) |o| {1503            defer ctx.gpa.free(o);1504            var lines = std.mem.splitScalar(u8, o, '\n');1505            while (lines.next()) |line| {1506                const t = std.mem.trim(u8, line, " \t\r");1507                if (t.len == 0) continue;1508                output.profileRow(t, "", "");1509            }1510        }1511        return;1512    }1513    if (std.mem.eql(u8, ctx.sub, "install")) {1514        const attr = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1515        _ = try exec.profileInstall(ctx.io, &ctx.machine, ctx.gpa, attr);1516        output.done();1517        return;1518    }1519    if (std.mem.eql(u8, ctx.sub, "remove")) {1520        const attr = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1521        _ = try exec.profileRemove(ctx.io, &ctx.machine, ctx.gpa, attr);1522        output.done();1523        return;1524    }1525    if (std.mem.eql(u8, ctx.sub, "upgrade")) {1526        _ = try exec.profileUpgrade(ctx.io, &ctx.machine, ctx.gpa);1527        output.done();1528        return;1529    }1530}15311532// --- Pkg commands ---15331534const pkg_help = [_][2][]const u8{1535    .{ "why <pkg>", "what pulled it in" },1536    .{ "deps <pkg>", "direct dependencies" },1537    .{ "size <pkg>", "closure size" },1538    .{ "path <pkg>", "store path" },1539    .{ "closure <pkg>", "full closure" },1540};15411542pub fn pkg(ctx: Ctx) !void {1543    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("pkg", &pkg_help, null);1544    const name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1545    if (std.mem.eql(u8, ctx.sub, "why")) {1546        if (try exec.pkgWhy(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;1547        return;1548    }1549    if (std.mem.eql(u8, ctx.sub, "deps")) {1550        if (try exec.pkgDeps(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;1551        return;1552    }1553    if (std.mem.eql(u8, ctx.sub, "size")) {1554        const s = try exec.pkgSize(ctx.gpa, ctx.io, &ctx.machine, name);1555        defer ctx.gpa.free(s);1556        output.pkgResult("size", s);1557        return;1558    }1559    if (std.mem.eql(u8, ctx.sub, "path")) {1560        const p = try exec.storePath(ctx.gpa, ctx.io, &ctx.machine, name);1561        defer ctx.gpa.free(p);1562        output.pkgResult("path", p);1563        return;1564    }1565    if (std.mem.eql(u8, ctx.sub, "closure")) {1566        if (try exec.pkgClosure(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;1567        return;1568    }1569}15701571// Top-level alias for `nina pkg why <pkg>` — surfaces what pulled a package in1572// without the user needing to know about the `pkg` subgroup.1573pub fn why(ctx: Ctx) !void {1574    const name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1575    if (try exec.pkgWhy(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;1576}15771578// --- Pin / Unpin ---15791580pub fn pin(ctx: Ctx) !void {1581    const input = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1582    const commit = if (ctx.args.len > 1) ctx.args[1] else return error.Internal;1583    exec.editFlakeLock(ctx.gpa, input, commit) catch return error.ProcessFailed;1584    output.pinDone(input, commit);1585}15861587pub fn unpin(ctx: Ctx) !void {1588    const input = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1589    _ = try exec.flakeUpdate(ctx.io, &ctx.machine, ctx.gpa, input);1590    output.unpinDone(input);1591}15921593// --- Hash / Fetch ---15941595pub fn hash(ctx: Ctx) !void {1596    const path = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1597    const h = try exec.nixHash(ctx.gpa, ctx.io, &ctx.machine, path);1598    defer ctx.gpa.free(h);1599    output.hashResult(std.mem.trim(u8, h, " \t\n\r"));1600}16011602pub fn fetch(ctx: Ctx) !void {1603    const url = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1604    const h = try exec.nixFetch(ctx.gpa, ctx.io, &ctx.machine, url);1605    defer ctx.gpa.free(h);1606    output.fetchResult(std.mem.trim(u8, h, " \t\n\r"), url);1607}16081609// --- Build / Run ---16101611pub fn build(ctx: Ctx) !void {1612    const attr: ?[]const u8 = if (ctx.args.len > 0) ctx.args[0] else null;1613    output.buildStart(attr orelse "default");1614    const code = try exec.nixBuild(ctx.io, &ctx.machine, ctx.gpa, attr);1615    if (code != 0) return error.BuildFailed;1616    output.buildDone();1617}16181619pub fn runCmd(ctx: Ctx) !void {1620    const pkg_arg = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1621    output.runStart(pkg_arg);1622    _ = try exec.nixRun(ctx.io, &ctx.machine, ctx.gpa, pkg_arg);1623}16241625// --- Hello ---16261627pub fn hello(ctx: Ctx) !void {1628    output.hello(ctx.cfg.machines);1629}16301631const ConfigKind = enum { flake, channel, none };16321633// Scan the conventional /etc/nixos for a flake.nix (flake-based) or a1634// configuration.nix (channel-based) to pre-fill the wizard's defaults.1635fn scanConfig(io: std.Io) ConfigKind {1636    if (exec.pathExists(io, "/etc/nixos/flake.nix")) return .flake;1637    if (exec.pathExists(io, "/etc/nixos/configuration.nix")) return .channel;1638    return .none;1639}16401641// Runs when the config is absent on first invocation (interactive TTY only).1642// Scans for an existing nixos config, detects flake vs channel, and offers a1643// smart default path — flake-ness is detected, never asked.1644pub fn firstRunWizard(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) !void {1645    output.firstRunBanner();1646    output.firstRunNoConfig();16471648    var name_buf: [256]u8 = undefined;1649    var path_buf: [256]u8 = undefined;16501651    const machine_name = output.firstRunPrompt("machine name", "my-machine", &name_buf);16521653    output.firstRunScanning();1654    const kind = scanConfig(io);1655    switch (kind) {1656        .flake => output.firstRunDetected("/etc/nixos/flake.nix", true),1657        .channel => output.firstRunDetected("/etc/nixos/configuration.nix", false),1658        .none => output.firstRunNoneFound(),1659    }16601661    // Detected systems default to /etc/nixos (press enter to confirm); when1662    // nothing was found, leave the default empty so the user must type a path.1663    const default_path: []const u8 = if (kind == .none) "" else "/etc/nixos";1664    const config_path = output.firstRunPromptDefault("config path", default_path, kind != .none, &path_buf);16651666    // Re-detect at the chosen path in case the user pointed elsewhere — flake.nix1667    // there means a flake system, recorded so channel commands warn appropriately.1668    const use_flakes = exec.dirHasFlake(gpa, io, config_path);16691670    const conf_path = try config.configPath(gpa, environ);1671    defer gpa.free(conf_path);1672    if (std.fs.path.dirname(conf_path)) |dir| exec.ensureDir(gpa, io, dir);16731674    // `flake` is a top-level config field, so it must precede the [machine] block.1675    const flake_line = if (use_flakes) "flake = true\n" else "";1676    var content_buf: [1024]u8 = undefined;1677    const content = try std.fmt.bufPrint(1678        &content_buf,1679        "{s}[machine]\nname = {s}\nconfig = {s}\nlocal = true\n",1680        .{ flake_line, machine_name, config_path },1681    );16821683    const file = std.Io.Dir.createFile(.cwd(), io, conf_path, .{}) catch {1684        errors.error_info.setMessage("could not write {s}", .{conf_path});1685        return error.Internal;1686    };1687    defer file.close(io);1688    file.writePositionalAll(io, content, 0) catch {1689        errors.error_info.setMessage("could not write {s}", .{conf_path});1690        return error.Internal;1691    };16921693    output.firstRunWritten(conf_path);1694}16951696pub fn setup(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) !void {1697    // Create the config first if it doesn't exist. This makes `nina setup`1698    // a complete onboarding command — not just a nix-features check. Any legacy1699    // ~/.nina.conf is migrated to the XDG path before we decide to run the wizard.1700    config.migrateLegacyConfig(gpa, io, environ);1701    if (config.configPath(gpa, environ)) |conf_path| {1702        defer gpa.free(conf_path);1703        if (std.Io.Dir.openFile(.cwd(), io, conf_path, .{})) |f| {1704            f.close(io);1705        } else |_| {1706            try firstRunWizard(gpa, io, environ);1707            errors.error_info.reset();1708        }1709    } else |_| {}17101711    output.setupCheck();1712    const status = exec.checkNixFeatures(gpa, io, environ);1713    output.setupFeatures(status.nix_command, status.flakes);17141715    if (status.allEnabled()) {1716        output.setupAllSet();1717        api.ensureRegistryPinned(gpa, io, environ);1718        return;1719    }17201721    // On NixOS the features belong in configuration.nix (the declarative,1722    // permanent home), not ~/.config/nix/nix.conf. Offer to add the one line;1723    // the user runs the rebuild. We don't pin the registry here because the1724    // features aren't live until that rebuild lands.1725    if (exec.isNixOS(io)) {1726        const conf_path = "/etc/nixos/configuration.nix";1727        if (exec.nixosConfigEnablesFeatures(gpa, io, conf_path)) {1728            output.setupNixosNeedsRebuild(conf_path);1729            return;1730        }1731        output.setupNixosOffer(exec.NIXOS_FEATURES_LINE, conf_path);1732        if (output.confirmDefaultNo("add it now?")) {1733            if (exec.appendFeaturesToNixosConfig(gpa, io, environ, conf_path)) |_| {1734                output.setupNixosWrote(conf_path);1735            } else |_| {1736                output.setupNixosManual(exec.NIXOS_FEATURES_LINE, conf_path);1737            }1738        } else {1739            output.setupNixosManual(exec.NIXOS_FEATURES_LINE, conf_path);1740        }1741        return;1742    }17431744    // Non-NixOS: a user-level nix.conf takes effect immediately, no sudo needed.1745    output.setupEnabling();1746    const path = try exec.enableNixFeatures(gpa, io, environ);1747    defer gpa.free(path);17481749    output.setupDone(path);1750    api.ensureRegistryPinned(gpa, io, environ);1751}17521753// --- Log helper ---17541755fn logAction(ctx: Ctx, action: []const u8, gen: u32) void {1756    var ts_buf: [32]u8 = undefined;1757    const ts = nowIso(ctx.io, &ts_buf);1758    var buf: [256]u8 = undefined;1759    const entry = std.fmt.bufPrint(&buf, "{{\"ts\":\"{s}\",\"machine\":\"{s}\",\"command\":\"{s}\",\"outcome\":\"success\",\"gen_before\":null,\"gen_after\":{d},\"duration_ms\":0}}\n", .{1760        ts, ctx.machine.name, action, gen,1761    }) catch return;1762    exec.appendNinaLog(ctx.io, ctx.environ, entry);1763}17641765// Wall-clock UTC as ISO-8601. Uses Io.Clock.real (the settable Unix-epoch clock);1766// Io.Clock.awake is monotonic and unsuitable for timestamps. Falls back to epoch 0.1767fn nowIso(io: std.Io, buf: []u8) []const u8 {1768    const fallback = "1970-01-01T00:00:00Z";1769    const ns = std.Io.Clock.real.now(io).toNanoseconds();1770    if (ns <= 0) return fallback;1771    const secs: u64 = @intCast(@divFloor(ns, 1_000_000_000));1772    const es = std.time.epoch.EpochSeconds{ .secs = secs };1773    const ed = es.getEpochDay();1774    const yd = ed.calculateYearDay();1775    const md = yd.calculateMonthDay();1776    const ds = es.getDaySeconds();1777    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", .{1778        yd.year,              md.month.numeric(),      @as(u32, md.day_index) + 1,1779        ds.getHoursIntoDay(), ds.getMinutesIntoHour(), ds.getSecondsIntoMinute(),1780    }) catch return fallback;1781}