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";1516const Semver = struct {17    major: u32,18    minor: u32,19    patch: u32,20};2122pub const Ctx = struct {23    gpa: std.mem.Allocator,24    io: std.Io,25    environ: *const std.process.Environ.Map,26    machine: types.Machine,27    cfg: types.NinaConfig,28    args: []const []const u8, // positional args after subcommand29    sub: []const u8, // subcommand (e.g. "list" in "service list")30    dry: bool,31    check: bool,32    no_apply: bool,33    all: bool,34    last: u32,35    json: bool,36    user: bool, // --user: operate on user (vs system) services37};3839// A system is flake-managed when the config says so OR a flake.nix is present in40// the config dir. Detection means a fresh channel user who points nina at a flake41// dir gets the right behavior without editing config first.42fn flakeSystem(ctx: Ctx) bool {43    return ctx.cfg.flake or exec.configHasFlake(ctx.gpa, ctx.io, &ctx.machine);44}4546fn runPreHook(ctx: Ctx, hook_name: []const u8) !bool {47    const hook = try exec.runHook(ctx.gpa, ctx.io, ctx.environ, hook_name);48    defer ctx.gpa.free(hook.output);49    switch (hook.result) {50        .not_found, .ok => return true,51        .failed => {52            output.hookFailed(hook_name, hook.exit_code, hook.output);53            return output.confirmDefaultNo("continue anyway?");54        },55    }56}5758fn runPostHook(ctx: Ctx, hook_name: []const u8) void {59    const hook = exec.runHook(ctx.gpa, ctx.io, ctx.environ, hook_name) catch return;60    defer ctx.gpa.free(hook.output);61    if (hook.result == .failed) {62        output.hookWarning(hook_name, hook.exit_code, hook.output);63    }64}6566pub fn apply(ctx: Ctx) !void {67    if (ctx.dry) {68        output.applyDry(ctx.machine.name);69        const code = try exec.nixosRebuildDryActivate(ctx.io, &ctx.machine, ctx.gpa);70        if (code != 0) return error.BuildFailed;71        output.applyDryDone();72        return;73    }74    if (ctx.check) {75        return check(ctx);76    }7778    if (!try runPreHook(ctx, "pre-apply")) {79        output.aborted();80        return error.HookAborted;81    }8283    output.applyStart(ctx.machine.name);84    output.buildPanelInit();85    const start = std.Io.Clock.awake.now(ctx.io);8687    var panel = output.BuildPanel{};88    const code = exec.nixosRebuildSwitchWithPanel(ctx.io, &ctx.machine, ctx.gpa, &panel) catch |e| {89        output.buildPanelClear();90        exec.markApplyFailed(ctx.io, ctx.environ);91        return e;92    };93    output.buildPanelClear();9495    if (code != 0) {96        exec.markApplyFailed(ctx.io, ctx.environ);97        return error.BuildFailed;98    }99100    const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());101    const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));102    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine) catch 0;103    const after_failure = exec.takeApplyFailed(ctx.io, ctx.environ);104    output.applyDone(gen, elapsed, after_failure);105    // Show any nix warnings collected during the build (dim yellow, after success line).106    const warnings = errors.extractWarnings(ctx.gpa, errors.getBuildStderr()) catch &.{};107    defer {108        for (warnings) |w| ctx.gpa.free(w);109        ctx.gpa.free(warnings);110    }111    if (warnings.len > 0) output.buildWarnings(warnings);112    runPostHook(ctx, "post-apply");113    logAction(ctx, "apply", gen);114}115116pub fn check(ctx: Ctx) !void {117    output.checkStart(ctx.machine.name);118    const code = try exec.nixosRebuildBuild(ctx.io, &ctx.machine, ctx.gpa);119    if (code != 0) return error.BuildFailed;120    output.checkOk();121}122123pub fn back(ctx: Ctx) !void {124    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);125    defer ctx.gpa.free(gens);126127    var current: u32 = 0;128    for (gens) |g| if (g.current) {129        current = g.number;130    };131132    // Newest generation older than current. If there is none, we're already at the133    // oldest — stop cleanly instead of letting rollback fail with 'build failed'.134    var prev: u32 = 0;135    var has_prev = false;136    for (gens) |g| {137        if (g.number < current and (!has_prev or g.number > prev)) {138            prev = g.number;139            has_prev = true;140        }141    }142    if (!has_prev) {143        output.alreadyOldest();144        return;145    }146147    if (!try runPreHook(ctx, "pre-back")) {148        output.aborted();149        return error.HookAborted;150    }151152    output.backStart(ctx.machine.name, current, prev);153    if (ctx.cfg.confirm and !output.confirm("")) return;154155    // Flake systems don't have <nixos-config> in the Nix search path, so156    // `nixos-rebuild --rollback` fails. Switch by generation number instead157    // (same path as `nina go N`), which works for both channel and flake.158    const code = if (flakeSystem(ctx))159        try exec.switchGeneration(ctx.io, &ctx.machine, ctx.gpa, prev)160    else161        try exec.rollback(ctx.io, &ctx.machine, ctx.gpa);162    if (code != 0) return error.BuildFailed;163    output.backDone(prev);164    runPostHook(ctx, "post-back");165}166167pub fn go(ctx: Ctx) !void {168    if (ctx.args.len == 0) return error.Internal;169    const target = std.fmt.parseInt(u32, ctx.args[0], 10) catch return error.Internal;170    const current = try exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine);171172    output.goStart(ctx.machine.name, current, target);173    if (ctx.cfg.confirm and !output.confirm("")) return;174175    const code = try exec.switchGeneration(ctx.io, &ctx.machine, ctx.gpa, target);176    if (code != 0) return error.ProcessFailed;177    output.generationDone(target);178}179180pub fn history(ctx: Ctx) !void {181    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);182    defer ctx.gpa.free(gens);183    output.historyHeader(ctx.machine.name);184    for (gens) |g| output.historyRow(g);185}186187const gen_help = [_][2][]const u8{188    .{ "list", "list generations" },189    .{ "current", "show current generation" },190    .{ "delete <n>", "delete generation n" },191    .{ "delete old", "delete old generations" },192};193194pub fn genCmd(ctx: Ctx) !void {195    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("gen", &gen_help, null);196    if (std.mem.eql(u8, ctx.sub, "list")) return history(ctx);197    if (std.mem.eql(u8, ctx.sub, "current")) {198        const n = try exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine);199        output.genCurrent(n);200        return;201    }202    if (std.mem.eql(u8, ctx.sub, "delete")) {203        if (ctx.args.len == 0) return error.Internal;204        if (std.mem.eql(u8, ctx.args[0], "old")) {205            if (ctx.cfg.confirm and !output.confirm("")) return;206            _ = try exec.deleteOldGenerations(ctx.io, &ctx.machine, ctx.gpa);207        } else {208            const n = std.fmt.parseInt(u32, ctx.args[0], 10) catch return error.Internal;209            if (ctx.cfg.confirm and !output.confirm("")) return;210            _ = try exec.deleteGeneration(ctx.io, &ctx.machine, ctx.gpa, n);211        }212        output.done();213        return;214    }215    return error.Internal;216}217218pub fn clean(ctx: Ctx) !void {219    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);220    defer ctx.gpa.free(gens);221    const all = ctx.all or std.mem.eql(u8, ctx.sub, "all");222    const total: u32 = @intCast(gens.len);223    // `clean all` keeps only the current generation; otherwise keep the configured224    // count. With nothing older than the keep limit, there's nothing to collect.225    const keep: u32 = if (all) 1 else ctx.cfg.generations;226    if (total <= keep) {227        output.cleanNothing(ctx.machine.name, total);228        return;229    }230    output.cleanStart(ctx.machine.name, keep, total);231    if (ctx.cfg.confirm and !output.confirm("removing — cannot be undone")) return;232    _ = try exec.collectGarbage(ctx.io, &ctx.machine, ctx.gpa, all, ctx.cfg.generations);233    output.cleanDone();234}235236pub fn statusCmd(ctx: Ctx) !void {237    output.statusHeader();238    // --all renders every configured machine; remotes route through the same SSH239    // path as exec.capture. An unreachable machine is shown in red, not fatal.240    if (ctx.all and ctx.cfg.machines.len > 0) {241        for (ctx.cfg.machines) |m| statusRowFor(ctx, &m);242    } else {243        statusRowFor(ctx, &ctx.machine);244    }245    homeStatusLine(ctx);246}247248// When standalone Home Manager is present, show its current generation as a dim249// line indented under the machine rows. Gated on standalone mode (the only mode250// where we can read a generation), so a machine without HM is unaffected.251fn homeStatusLine(ctx: Ctx) void {252    if (exec.detectHomeManager(ctx.gpa, ctx.io, ctx.environ) != .standalone) return;253    const out = exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine) catch return;254    defer ctx.gpa.free(out);255    const gens = parseHomeGenerations(ctx.gpa, out) catch return;256    defer freeHomeGens(ctx.gpa, gens);257    if (gens.len == 0) return;258    output.statusHomeRow(gens[0].number, gens[0].date);259}260261fn statusRowFor(ctx: Ctx, machine: *const types.Machine) void {262    // A failure to read the current generation means we couldn't reach or query263    // the machine — mark it unreachable rather than reporting a bogus gen 0.264    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, machine) catch {265        output.statusRow(machine.name, 0, "", "", false);266        return;267    };268    const st = exec.systemStatus(ctx.gpa, ctx.io, machine);269    defer ctx.gpa.free(st.size);270    defer ctx.gpa.free(st.age);271    output.statusRow(machine.name, gen, st.age, st.size, true);272}273274pub fn diff(ctx: Ctx) !void {275    const gens = try exec.getGenerations(ctx.gpa, ctx.io, &ctx.machine);276    defer ctx.gpa.free(gens);277    var current: u32 = 0;278    var prev: u32 = 0;279    for (gens) |g| {280        if (g.current) current = g.number;281        if (!g.current and g.number > prev and g.number < current) prev = g.number;282    }283    if (ctx.args.len >= 2) {284        const a = std.fmt.parseInt(u32, ctx.args[0], 10) catch current - 1;285        const b = std.fmt.parseInt(u32, ctx.args[1], 10) catch current;286        output.diffHeader(a, b, ctx.machine.name);287        if (try exec.diffClosures(ctx.io, &ctx.machine, ctx.gpa, a, b) != 0) return error.ProcessFailed;288    } else {289        output.diffHeader(if (prev > 0) prev else current - 1, current, ctx.machine.name);290        if (try exec.diffClosures(ctx.io, &ctx.machine, ctx.gpa, if (prev > 0) prev else current - 1, current) != 0) return error.ProcessFailed;291    }292}293294pub fn mood(ctx: Ctx) !void {295    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine) catch 0;296    const st = exec.systemStatus(ctx.gpa, ctx.io, &ctx.machine);297    defer ctx.gpa.free(st.size);298    defer ctx.gpa.free(st.age);299    const state = exec.systemRunningState(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");300    defer ctx.gpa.free(state);301    output.mood(ctx.machine.name, state, gen, st.age, st.size);302}303304pub fn doctor(ctx: Ctx) !void {305    output.doctorHeader(ctx.machine.name);306    const checks = try exec.runDoctorChecks(ctx.gpa, ctx.io, &ctx.machine);307    defer ctx.gpa.free(checks);308    var warnings: u32 = 0;309    var failures: u32 = 0;310    for (checks) |ch| {311        output.doctorRow(ch);312        if (ch.status == .warn) warnings += 1;313        if (ch.status == .fail) failures += 1;314    }315316    // Home Manager row only when present — absent on a machine without HM, so317    // doctor's table is unchanged there.318    const hm_mode = exec.detectHomeManager(ctx.gpa, ctx.io, ctx.environ);319    if (hm_mode != .none) {320        const note = homeDoctorNote(ctx, hm_mode);321        defer ctx.gpa.free(note);322        output.doctorRow(.{ .name = "home manager", .status = .ok, .note = note });323    }324325    output.doctorSummary(warnings, failures);326}327328// "standalone  gen 765" / "module" — the note shown in doctor's home manager row.329// Caller owns the returned slice.330fn homeDoctorNote(ctx: Ctx, mode: exec.HomeManagerMode) []const u8 {331    const label = switch (mode) {332        .standalone => "standalone",333        .module => "module",334        .none => "",335    };336    if (mode == .standalone) {337        const gen = homeCurrentGen(ctx);338        if (gen != 0)339            return std.fmt.allocPrint(ctx.gpa, "{s}  gen {d}", .{ label, gen }) catch340                (ctx.gpa.dupe(u8, label) catch "");341    }342    return ctx.gpa.dupe(u8, label) catch "";343}344345// nina update — kepr self-update for the nina binary itself.346pub fn update(ctx: Ctx) !void {347    output.updateSelfStart();348349    if (comptime std.mem.eql(u8, version.PLATFORM, "unsupported")) {350        output.updateSelfNoPlatform(@tagName(builtin.cpu.arch) ++ "-" ++ @tagName(builtin.os.tag));351        return error.Internal;352    }353354    const env_url = ctx.environ.get("NINA_UPDATE_SOURCE");355    const source_url = env_url orelse UPDATE_URL;356357    const body = exec.fetchUrl(ctx.gpa, ctx.io, source_url) catch |e| switch (e) {358        error.NetworkError, error.HttpError => {359            output.updateSelfNetworkError();360            return;361        },362        else => return e,363    };364    defer ctx.gpa.free(body);365366    const parsed = std.json.parseFromSlice(std.json.Value, ctx.gpa, body, .{}) catch {367        output.printWarning("could not parse release metadata");368        return;369    };370    defer parsed.deinit();371372    const root = parsed.value;373    if (root != .object) {374        output.printWarning("malformed release metadata");375        return;376    }377378    const remote_ver = blk: {379        const v = root.object.get("version") orelse {380            output.printWarning("malformed release metadata");381            return;382        };383        break :blk switch (v) {384            .string => |s| s,385            else => {386                output.printWarning("malformed release metadata");387                return;388            },389        };390    };391    if (!remoteVersionNewer(version.VERSION, remote_ver)) {392        output.updateSelfCurrent(version.VERSION);393        return;394    }395396    const release_notes = try updateReleaseNotes(ctx.gpa, ctx.io, root, source_url, version.VERSION, remote_ver);397    defer ctx.gpa.free(release_notes);398399    output.updateSelfAvailable(version.VERSION, remote_ver);400    output.updateSelfReleaseNotes(release_notes);401    if (ctx.check) return;402403    var exe_buf: [std.Io.Dir.max_path_bytes]u8 = undefined;404    const install_path = exec.selfExePath(ctx.io, &exe_buf) catch {405        errors.error_info.setMessage("could not determine install path", .{});406        return error.Internal;407    };408409    // When running from the nix store, defer to nix profile upgrade so nix410    // manages the transition (the store is read-only; binary replacement fails).411    // A NixOS system install also resolves into the store but isn't a profile412    // element, so check the profile to avoid a no-op `upgrade` — it updates with413    // the next nixos-rebuild instead.414    if (std.mem.startsWith(u8, install_path, "/nix/store/")) {415        const nina_element = exec.profileNinaElement(ctx.gpa, ctx.io, &ctx.machine);416        defer {417            if (nina_element) |n| ctx.gpa.free(n);418        }419        if (nina_element == null) {420            output.updateSelfNotInProfile();421            return;422        }423        const element = nina_element.?;424        output.updateSelfNixManaged(remote_ver);425        if (ctx.cfg.confirm and !output.confirm("")) return;426        const ec = exec.streamLocal(ctx.io, &.{ "nix", "profile", "upgrade", element }) catch {427            output.updateSelfNixFailed();428            return;429        };430        if (ec != 0) {431            output.updateSelfNixFailed();432            return;433        }434        output.updateSelfDone(version.VERSION, remote_ver);435        return;436    }437438    const plat_info = blk: {439        const pv = root.object.get("platforms") orelse break :blk null;440        if (pv != .object) break :blk null;441        break :blk pv.object.get(version.PLATFORM);442    };443    if (plat_info == null) {444        output.updateSelfNoPlatform(version.PLATFORM);445        return;446    }447448    const dl_url = blk: {449        const v = plat_info.?.object.get("url") orelse {450            output.printWarning("malformed release metadata");451            return;452        };453        break :blk switch (v) {454            .string => |s| s,455            else => {456                output.printWarning("malformed release metadata");457                return;458            },459        };460    };461462    const raw_cksum = blk: {463        if (plat_info.?.object.get("blake3")) |v|464            break :blk switch (v) {465                .string => |s| s,466                else => {467                    output.printWarning("malformed release metadata");468                    return;469                },470            };471        if (plat_info.?.object.get("checksum")) |v|472            break :blk switch (v) {473                .string => |s| s,474                else => {475                    output.printWarning("malformed release metadata");476                    return;477                },478            };479        output.printWarning("missing checksum in release metadata");480        return;481    };482    const expected_hex = if (std.mem.startsWith(u8, raw_cksum, "blake3:")) raw_cksum["blake3:".len..] else raw_cksum;483484    if (ctx.cfg.confirm and !output.confirm("")) return;485486    output.updateSelfDownloading(remote_ver, version.PLATFORM);487    const tmp_path = exec.downloadToTemp(ctx.gpa, ctx.io, dl_url) catch {488        output.printWarning("download failed — check your connection and try again");489        return;490    };491    defer ctx.gpa.free(tmp_path);492493    output.updateSelfVerifying();494    exec.verifyAndInstall(ctx.gpa, ctx.io, tmp_path, expected_hex, install_path) catch |e| switch (e) {495        error.ChecksumMismatch => {496            output.updateSelfChecksumFailed();497            return;498        },499        else => return e,500    };501502    output.updateSelfDone(version.VERSION, remote_ver);503}504505fn updateReleaseNotes(gpa: std.mem.Allocator, io: std.Io, root: std.json.Value, source_url: []const u8, current: []const u8, latest: []const u8) ![]u8 {506    if (releaseNotesFromMetadata(gpa, root)) |notes| {507        if (std.mem.trim(u8, notes, " \t\r\n").len > 0) return notes;508        gpa.free(notes);509    }510    return buildKeprArchiveReleaseNotes(gpa, io, source_url, current, latest) catch gpa.dupe(u8, "");511}512513fn releaseNotesFromMetadata(gpa: std.mem.Allocator, root: std.json.Value) ?[]u8 {514    if (root != .object) return null;515    const keys = [_][]const u8{ "release_notes", "changelog", "notes" };516    for (keys) |key| {517        const v = root.object.get(key) orelse continue;518        switch (v) {519            .string => |s| return gpa.dupe(u8, s) catch null,520            else => {},521        }522    }523    return null;524}525526fn buildKeprArchiveReleaseNotes(gpa: std.mem.Allocator, io: std.Io, source_url: []const u8, current: []const u8, latest: []const u8) ![]u8 {527    const archive_url = try keprArchiveUrl(gpa, source_url);528    defer gpa.free(archive_url);529530    const body = exec.fetchUrl(gpa, io, archive_url) catch return gpa.dupe(u8, "");531    defer gpa.free(body);532533    return releaseNotesFromArchiveJson(gpa, body, current, latest);534}535536fn keprArchiveUrl(gpa: std.mem.Allocator, source_url: []const u8) ![]u8 {537    const scheme = std.mem.indexOf(u8, source_url, "://") orelse return error.InvalidUpdateSource;538    const path_start = std.mem.indexOfScalarPos(u8, source_url, scheme + 3, '/') orelse return error.InvalidUpdateSource;539    const origin = source_url[0..path_start];540    const path = source_url[path_start..];541    if (!std.mem.startsWith(u8, path, "/api/")) return error.InvalidUpdateSource;542543    const after_api = path["/api/".len..];544    const repo_end = std.mem.indexOfScalar(u8, after_api, '/') orelse return error.InvalidUpdateSource;545    const repo = after_api[0..repo_end];546    if (repo.len == 0) return error.InvalidUpdateSource;547548    return std.fmt.allocPrint(gpa, "{s}/{s}/archives.json?limit=40", .{ origin, repo });549}550551fn releaseNotesFromArchiveJson(gpa: std.mem.Allocator, body: []const u8, current: []const u8, latest: []const u8) ![]u8 {552    const parsed = std.json.parseFromSlice(std.json.Value, gpa, body, .{}) catch return gpa.dupe(u8, "");553    defer parsed.deinit();554555    if (parsed.value != .object) return gpa.dupe(u8, "");556    const saves_v = parsed.value.object.get("saves") orelse return gpa.dupe(u8, "");557    if (saves_v != .array) return gpa.dupe(u8, "");558559    var out: std.ArrayList(u8) = .empty;560    errdefer out.deinit(gpa);561    var any = false;562    for (saves_v.array.items) |save| {563        if (save != .object) continue;564        const ver_v = save.object.get("version") orelse continue;565        const msg_v = save.object.get("message") orelse continue;566        if (ver_v != .string or msg_v != .string) continue;567        const ver = ver_v.string;568        const msg = std.mem.trim(u8, msg_v.string, " \t\r\n");569        if (msg.len == 0 or !versionInUpdateRange(ver, current, latest)) continue;570571        try appendFmt(&out, gpa, "## {s}\n", .{ver});572        try appendFmt(&out, gpa, "- {s}\n\n", .{msg});573        any = true;574    }575576    if (!any) {577        out.deinit(gpa);578        return gpa.dupe(u8, "");579    }580    return out.toOwnedSlice(gpa);581}582583fn appendFmt(out: *std.ArrayList(u8), gpa: std.mem.Allocator, comptime template: []const u8, args: anytype) !void {584    const line = try std.fmt.allocPrint(gpa, template, args);585    defer gpa.free(line);586    try out.appendSlice(gpa, line);587}588589fn versionInUpdateRange(candidate: []const u8, current: []const u8, latest: []const u8) bool {590    const cand = parseSemver(candidate) orelse return std.mem.eql(u8, candidate, latest);591    const cur = parseSemver(current) orelse return std.mem.eql(u8, candidate, latest);592    const lat = parseSemver(latest) orelse return std.mem.eql(u8, candidate, latest);593    return compareSemver(cand, cur) == .gt and compareSemver(cand, lat) != .gt;594}595596fn remoteVersionNewer(current: []const u8, remote: []const u8) bool {597    const cur = parseSemver(current) orelse return !std.mem.eql(u8, current, remote);598    const rem = parseSemver(remote) orelse return !std.mem.eql(u8, current, remote);599    return compareSemver(rem, cur) == .gt;600}601602const VersionOrder = enum { lt, eq, gt };603604fn compareSemver(a: Semver, b: Semver) VersionOrder {605    if (a.major != b.major) return if (a.major < b.major) .lt else .gt;606    if (a.minor != b.minor) return if (a.minor < b.minor) .lt else .gt;607    if (a.patch != b.patch) return if (a.patch < b.patch) .lt else .gt;608    return .eq;609}610611fn parseSemver(raw: []const u8) ?Semver {612    const v = if (std.mem.startsWith(u8, raw, "v")) raw[1..] else raw;613    var it = std.mem.splitScalar(u8, v, '.');614    const major_s = it.next() orelse return null;615    const minor_s = it.next() orelse return null;616    const patch_s = it.next() orelse return null;617    if (it.next() != null) return null;618    return .{619        .major = std.fmt.parseInt(u32, major_s, 10) catch return null,620        .minor = std.fmt.parseInt(u32, minor_s, 10) catch return null,621        .patch = std.fmt.parseInt(u32, patch_s, 10) catch return null,622    };623}624625test "versionInUpdateRange includes only newer versions through latest" {626    try std.testing.expect(versionInUpdateRange("3.2.3", "3.1.9", "3.2.3"));627    try std.testing.expect(versionInUpdateRange("3.2.0", "3.1.9", "3.2.3"));628    try std.testing.expect(!versionInUpdateRange("3.1.9", "3.1.9", "3.2.3"));629    try std.testing.expect(!versionInUpdateRange("3.2.4", "3.1.9", "3.2.3"));630}631632test "remoteVersionNewer does not offer downgrades" {633    try std.testing.expect(remoteVersionNewer("3.2.3", "3.2.4"));634    try std.testing.expect(!remoteVersionNewer("3.2.4", "3.2.3"));635    try std.testing.expect(!remoteVersionNewer("3.2.4", "3.2.4"));636}637638test "releaseNotesFromArchiveJson builds changelog from versioned saves" {639    const body =640        \\{641        \\  "saves": [642        \\    {"version":"3.2.3","message":"upgrade: live build panel during rebuild phase"},643        \\    {"version":"3.1.9","message":"old release"},644        \\    {"version":null,"message":"unversioned"}645        \\  ]646        \\}647    ;648    const notes = try releaseNotesFromArchiveJson(std.testing.allocator, body, "3.1.9", "3.2.3");649    defer std.testing.allocator.free(notes);650651    try std.testing.expect(std.mem.indexOf(u8, notes, "## 3.2.3") != null);652    try std.testing.expect(std.mem.indexOf(u8, notes, "- upgrade: live build panel") != null);653    try std.testing.expect(std.mem.indexOf(u8, notes, "old release") == null);654}655656// nina goodbye — clean uninstall. Three install paths:657// - nix profile (binary in nix store with a profile element) → nix profile remove658// - koh build or source build (plain binary on PATH) → delete the file659pub fn goodbye(ctx: Ctx) !void {660    output.goodbyeStart();661662    var exe_buf: [std.Io.Dir.max_path_bytes]u8 = undefined;663    const install_path = exec.selfExePath(ctx.io, &exe_buf) catch {664        errors.error_info.setMessage("could not determine install path", .{});665        return error.Internal;666    };667668    // A binary outside the nix store is a koh build or source build — delete it.669    if (!std.mem.startsWith(u8, install_path, "/nix/store/")) {670        output.goodbyeFile(install_path);671        if (ctx.cfg.confirm and !output.confirm("")) return;672        std.Io.Dir.deleteFileAbsolute(ctx.io, install_path) catch |e| {673            errors.error_info.setMessage("could not remove {s}", .{install_path});674            return e;675        };676        output.goodbyeDone();677        return;678    }679680    // Binary is in the nix store — find and remove the profile element.681    const nina_element = exec.profileNinaElement(ctx.gpa, ctx.io, &ctx.machine);682    defer {683        if (nina_element) |n| ctx.gpa.free(n);684    }685686    if (nina_element == null) {687        errors.error_info.setMessage("nina not found in nix profile — was it installed via 'nix profile add'?", .{});688        return error.Internal;689    }690691    output.goodbyeNix();692    if (ctx.cfg.confirm and !output.confirm("")) return;693    const ec = exec.streamLocal(ctx.io, &.{ "nix", "profile", "remove", nina_element.? }) catch {694        output.goodbyeFailed("nix profile remove failed");695        return;696    };697    if (ec != 0) {698        output.goodbyeFailed("nix profile remove failed");699        return;700    }701    output.goodbyeDone();702}703704fn channelUpdateCmd(ctx: Ctx) !void {705    output.updateStart(ctx.machine.name);706    _ = try exec.channelUpdate(ctx.io, &ctx.machine, ctx.gpa);707    output.updateDone();708}709710pub fn upgrade(ctx: Ctx) !void {711    if (!try runPreHook(ctx, "pre-upgrade")) {712        output.aborted();713        return error.HookAborted;714    }715716    output.upgradeStart(ctx.machine.name);717    // Flake systems update inputs (flake.lock); channel systems update channels.718    // Running nix-channel --update on a flake system is a no-op at best. The719    // rebuild below is already flake-aware via exec.nixosRebuildSwitch.720    if (flakeSystem(ctx)) {721        output.printSubstep("updating flake inputs", .{});722        _ = exec.flakeUpdateAt(ctx.io, &ctx.machine, ctx.gpa, ctx.machine.config_path) catch {};723    } else {724        output.printSubstep("updating channels", .{});725        _ = exec.channelUpdate(ctx.io, &ctx.machine, ctx.gpa) catch {};726    }727    output.printSubstep("rebuilding", .{});728    output.buildPanelInit();729    const start = std.Io.Clock.awake.now(ctx.io);730    var panel = output.BuildPanel{};731    const code = exec.nixosRebuildSwitchWithPanel(ctx.io, &ctx.machine, ctx.gpa, &panel) catch |e| {732        output.buildPanelClear();733        return e;734    };735    output.buildPanelClear();736    if (code != 0) {737        output.applyFailed("");738        return error.BuildFailed;739    }740    const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());741    const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));742    const gen = exec.getCurrentGeneration(ctx.gpa, ctx.io, &ctx.machine) catch 0;743    output.applyDone(gen, elapsed, false);744    runPostHook(ctx, "post-upgrade");745}746747pub fn log(ctx: Ctx) !void {748    output.logHeader(ctx.machine.name);749    const content = exec.readNinaLog(ctx.gpa, ctx.io, ctx.environ, ctx.last) catch {750        // No log yet — that's fine751        return;752    };753    defer ctx.gpa.free(content);754    var lines = std.mem.splitScalar(u8, content, '\n');755    while (lines.next()) |line| {756        const t = std.mem.trim(u8, line, " \t\r");757        if (t.len == 0) continue;758        if (t[0] == '{') {759            renderJsonLogLine(ctx.gpa, t);760        } else {761            // legacy tab-separated format762            var parts = std.mem.tokenizeScalar(u8, t, '\t');763            const date = parts.next() orelse continue;764            const time = parts.next() orelse "";765            const action = parts.next() orelse "";766            const detail = parts.next() orelse "";767            output.logRow(date, time, action, detail);768        }769    }770}771772// The on-disk log is JSON Lines: {"ts","machine","command","outcome","gen_after",...}.773// Render ts -> date/time columns, command -> action, outcome(+gen) -> detail.774fn renderJsonLogLine(gpa: std.mem.Allocator, line: []const u8) void {775    const parsed = std.json.parseFromSlice(std.json.Value, gpa, line, .{}) catch {776        output.logRow(line, "", "", ""); // unparseable — show raw rather than drop777        return;778    };779    defer parsed.deinit();780    if (parsed.value != .object) return;781    const o = parsed.value.object;782783    const ts = jsonStr(o, "ts");784    const date = if (ts.len >= 10) ts[0..10] else ts;785    const time = if (ts.len >= 16) ts[11..16] else "";786    const action = jsonStr(o, "command");787    const outcome = jsonStr(o, "outcome");788789    var buf: [160]u8 = undefined;790    var detail: []const u8 = outcome;791    if (o.get("gen_after")) |g| {792        if (g == .integer) {793            detail = std.fmt.bufPrint(&buf, "{s}   -> gen {d}", .{ outcome, g.integer }) catch outcome;794        }795    }796    output.logRow(date, time, action, detail);797}798799fn jsonStr(o: std.json.ObjectMap, key: []const u8) []const u8 {800    if (o.get(key)) |v| {801        if (v == .string) return v.string;802    }803    return "";804}805806pub fn edit(ctx: Ctx) !void {807    const hardware = ctx.args.len > 0 and std.mem.eql(u8, ctx.args[0], "hardware");808    const filename = if (hardware) "hardware-configuration.nix" else "configuration.nix";809    const path = try std.fmt.allocPrint(ctx.gpa, "{s}/{s}", .{ ctx.machine.config_path, filename });810    defer ctx.gpa.free(path);811    output.editOpen(path, ctx.cfg.editor);812    _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, path, null);813}814815pub fn fmt(ctx: Ctx) !void {816    const path = try std.fmt.allocPrint(ctx.gpa, "{s}/configuration.nix", .{ctx.machine.config_path});817    defer ctx.gpa.free(path);818    if (ctx.check) {819        const code = try exec.nixpkgsFmt(ctx.io, &ctx.machine, ctx.gpa, path, true);820        if (code != 0) output.fmtNeedsFormat() else output.fmtDone();821        return;822    }823    output.fmtStart(path);824    _ = try exec.nixpkgsFmt(ctx.io, &ctx.machine, ctx.gpa, path, false);825    output.fmtDone();826}827828pub fn repl(ctx: Ctx) !void {829    output.replStart();830    _ = try exec.nixRepl(ctx.io, &ctx.machine, ctx.gpa);831}832833pub fn develop(ctx: Ctx) !void {834    if (std.mem.eql(u8, ctx.sub, "show")) {835        _ = try exec.nixBuild(ctx.io, &ctx.machine, ctx.gpa, null);836        return;837    }838    const run_cmd: ?[]const u8 = if (ctx.args.len > 0 and std.mem.eql(u8, ctx.sub, "run"))839        ctx.args[0]840    else841        null;842    output.developStart(&.{});843    _ = try exec.nixDevelopPs1(ctx.io, &ctx.machine, ctx.gpa, run_cmd, ctx.environ);844    output.developDone();845}846847pub fn info(ctx: Ctx) !void {848    output.infoHeader(ctx.machine.name);849    const nixos_ver = exec.systemInfo(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");850    defer ctx.gpa.free(nixos_ver);851    output.infoRow("nixos", std.mem.trim(u8, nixos_ver, " \t\n\r"));852853    const kernel = exec.kernelInfo(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");854    defer ctx.gpa.free(kernel);855    output.infoRow("kernel", std.mem.trim(u8, kernel, " \t\n\r"));856857    const uptime = exec.uptimeInfo(ctx.gpa, ctx.io, &ctx.machine) catch try ctx.gpa.dupe(u8, "unknown");858    defer ctx.gpa.free(uptime);859    output.infoRow("uptime", std.mem.trim(u8, uptime, " \t\n\r"));860}861862pub fn boot(ctx: Ctx) !void {863    output.bootHeader(ctx.machine.name);864    const entries = exec.bootEntries(ctx.gpa, ctx.io, &ctx.machine) catch &.{};865    defer ctx.gpa.free(entries);866    for (entries, 0..) |entry, i| output.bootEntry(entry, i);867}868869pub fn searchCmd(ctx: Ctx) !void {870    const query = if (ctx.args.len > 0) ctx.args[0] else "";871    api.ensureRegistryPinned(ctx.gpa, ctx.io, ctx.environ);872    const selected = try search_tui.run(ctx.gpa, ctx.io, query, .packages);873    if (selected) |npkg| try selectAndInstall(ctx, npkg);874}875876pub fn optionCmd(ctx: Ctx) !void {877    const query = if (ctx.args.len > 0) ctx.args[0] else "";878    api.ensureRegistryPinned(ctx.gpa, ctx.io, ctx.environ);879    _ = try search_tui.run(ctx.gpa, ctx.io, query, .options);880}881882pub fn install(ctx: Ctx) !void {883    const pkg_name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;884885    api.ensureRegistryPinned(ctx.gpa, ctx.io, ctx.environ);886887    // Search for the package to get the attr888    const pkgs = api.searchPackages(ctx.gpa, ctx.io, pkg_name) catch {889        errors.error_info.setMessage("'{s}' not found in nixpkgs", .{pkg_name});890        errors.error_info.setSuggestion("nina search {s}", .{pkg_name});891        return error.PackageNotFound;892    };893894    if (pkgs.len == 0) {895        // No matches — likely a typo. Suggest the closest real package and offer it.896        if (closestPackage(ctx, pkg_name)) |sugg| {897            output.didYouMean(pkg_name, sugg.pname);898            if (output.confirm("")) try selectAndInstall(ctx, sugg);899            return;900        }901        errors.error_info.setMessage("'{s}' not found in nixpkgs", .{pkg_name});902        errors.error_info.setSuggestion("nina search {s}", .{pkg_name});903        return error.PackageNotFound;904    }905906    // Prefer an exact name match over the first search result — `install ripgrep`907    // must pick "ripgrep", not the alphabetically-first match like "repgrep".908    var found = pkgs[0];909    for (pkgs) |p| {910        if (std.mem.eql(u8, p.pname, pkg_name)) {911            found = p;912            break;913        }914    }915    try selectAndInstall(ctx, found);916}917918// Find the real package whose name is closest to a not-found query (typo help).919// Typos usually keep the leading characters, so gather candidates with a prefix920// search and rank by edit distance; return the best only if it's typo-close.921fn closestPackage(ctx: Ctx, query: []const u8) ?types.NixPackage {922    if (query.len < 2) return null;923    var candidates = api.searchPackages(ctx.gpa, ctx.io, query[0..@min(query.len, 4)]) catch &.{};924    if (candidates.len == 0 and query.len > 2) {925        candidates = api.searchPackages(ctx.gpa, ctx.io, query[0..2]) catch &.{};926    }927    if (candidates.len == 0) return null;928929    var best: ?types.NixPackage = null;930    var best_dist: usize = std.math.maxInt(usize);931    for (candidates) |p| {932        const d = editDistance(query, p.pname);933        if (d > 0 and d < best_dist) {934            best_dist = d;935            best = p;936        }937    }938    // Only suggest a genuinely close name, scaled to query length.939    const threshold = @max(@as(usize, 2), query.len / 3);940    return if (best_dist <= threshold) best else null;941}942943// Case-insensitive Levenshtein distance. Names longer than the row buffer are944// treated as far away (never suggested).945fn editDistance(a: []const u8, b: []const u8) usize {946    const n = b.len;947    if (a.len == 0) return n;948    if (n == 0) return a.len;949    if (n + 1 > 128) return std.math.maxInt(usize);950    var prev: [128]usize = undefined;951    var curr: [128]usize = undefined;952    var j: usize = 0;953    while (j <= n) : (j += 1) prev[j] = j;954    var i: usize = 1;955    while (i <= a.len) : (i += 1) {956        curr[0] = i;957        j = 1;958        while (j <= n) : (j += 1) {959            const cost: usize = if (std.ascii.toLower(a[i - 1]) == std.ascii.toLower(b[j - 1])) 0 else 1;960            curr[j] = @min(prev[j] + 1, @min(curr[j - 1] + 1, prev[j - 1] + cost));961        }962        @memcpy(prev[0 .. n + 1], curr[0 .. n + 1]);963    }964    return prev[n];965}966967test "editDistance is case-insensitive Levenshtein" {968    try std.testing.expectEqual(@as(usize, 1), editDistance("firefux", "firefox"));969    try std.testing.expectEqual(@as(usize, 0), editDistance("git", "GIT"));970    try std.testing.expectEqual(@as(usize, 2), editDistance("fierfox", "firefox"));971    try std.testing.expectEqual(@as(usize, 7), editDistance("", "firefox"));972}973974// Prompt for the install method (profile / system / try) and dispatch. Shared by975// `nina install <pkg>` and the search widget's Enter-to-select — the letter keys976// are read here, after the search widget's raw mode is gone, so they don't977// collide with typing a query.978fn selectAndInstall(ctx: Ctx, npkg: types.NixPackage) !void {979    output.installSelectPrompt(npkg.pname, npkg.version);980981    var choice_buf: [8]u8 = undefined;982    var choice_len: usize = 0;983    while (choice_len < choice_buf.len) {984        const n = std.posix.read(std.posix.STDIN_FILENO, choice_buf[choice_len .. choice_len + 1]) catch break;985        if (n == 0) break;986        if (choice_buf[choice_len] == '\n') break;987        choice_len += 1;988    }989    const choice = std.mem.trim(u8, choice_buf[0..choice_len], " \t");990991    if (choice.len == 0 or choice[0] == 'i' or choice[0] == 'I') {992        try profileInstallPkg(ctx, npkg);993    } else if (choice[0] == 's' or choice[0] == 'S') {994        try systemInstallPkg(ctx, npkg);995    } else if (choice[0] == 't' or choice[0] == 'T') {996        try tryPkg(ctx, npkg);997    }998}9991000fn profileInstallPkg(ctx: Ctx, npkg: types.NixPackage) !void {1001    output.installStart(npkg.pname, .profile);1002    output.printSubstep("nix profile add nixpkgs#{s}", .{npkg.attr});1003    output.printTeach(try std.fmt.allocPrint(ctx.gpa, "nix profile add nixpkgs#{s}", .{npkg.attr}));1004    const code = try exec.profileInstall(ctx.io, &ctx.machine, ctx.gpa, npkg.attr);1005    if (code != 0) return error.ProcessFailed;1006    output.installDone(npkg.pname);1007}10081009fn systemInstallPkg(ctx: Ctx, npkg: types.NixPackage) !void {1010    const config_path = try std.fmt.allocPrint(ctx.gpa, "{s}/configuration.nix", .{ctx.machine.config_path});1011    defer ctx.gpa.free(config_path);1012    const line = api.findSystemPackagesLine(ctx.io, config_path) orelse 1;1013    output.installEditorPrompt(npkg.pname, config_path, line, ctx.cfg.editor);1014    _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, config_path, line);1015    if (ctx.cfg.confirm) {1016        if (output.confirm("apply now? ")) {1017            try apply(ctx);1018        }1019    }1020}10211022fn tryPkg(ctx: Ctx, npkg: types.NixPackage) !void {1023    output.tryStart(npkg.pname);1024    output.printSubstep("nix shell nixpkgs#{s}", .{npkg.attr});1025    output.tryExitHint();1026    _ = try exec.nixShellPs1(ctx.io, &ctx.machine, ctx.gpa, npkg.attr, ctx.environ);1027    output.tryDone();1028}10291030pub fn remove(ctx: Ctx) !void {1031    const pkg_name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1032    output.removeStart(pkg_name);1033    const code = try exec.profileRemove(ctx.io, &ctx.machine, ctx.gpa, pkg_name);1034    if (code != 0) return error.ProcessFailed;1035    output.done();1036}10371038pub fn list(ctx: Ctx) !void {1039    output.listHeader(ctx.machine.name);10401041    // Profile packages: parse `nix profile list --json` into clean name+version1042    // rows instead of dumping nix's verbose multi-line "Name:/Flake attribute:"1043    // blocks.1044    if (exec.profileListJson(ctx.gpa, ctx.io, &ctx.machine) catch null) |json| {1045        defer ctx.gpa.free(json);1046        output.listSection("profile");1047        renderProfileJson(ctx.gpa, json);1048    }10491050    // System packages: the references of /run/current-system/sw, each a1051    // <hash>-<name>-<version> store path.1052    if (exec.systemPackagePaths(ctx.gpa, ctx.io, &ctx.machine) catch null) |paths| {1053        defer ctx.gpa.free(paths);1054        output.blankLine();1055        output.listSection("system");1056        var lines = std.mem.splitScalar(u8, paths, '\n');1057        while (lines.next()) |line| {1058            const t = std.mem.trim(u8, line, " \t\r");1059            if (t.len == 0) continue;1060            const row = pkgFromStorePath(t);1061            // Skip support paths with no parseable version (man pages, wrappers).1062            if (row.version.len == 0) continue;1063            output.listPkg(row.name, row.version);1064        }1065    }1066}10671068const PkgRow = struct { name: []const u8, version: []const u8 };10691070// Split a nix store path basename (<hash>-<name>-<version>) into name + version.1071// Version begins at the first '-' followed by a digit, which reliably lands on1072// the name/version boundary since the 32-char hash and package names start with1073// non-digits.1074fn pkgFromStorePath(path: []const u8) PkgRow {1075    const base = std.fs.path.basename(path);1076    const after_hash = if (base.len > 33 and base[32] == '-') base[33..] else base;1077    var i: usize = 0;1078    while (i + 1 < after_hash.len) : (i += 1) {1079        if (after_hash[i] == '-' and std.ascii.isDigit(after_hash[i + 1])) {1080            return .{ .name = after_hash[0..i], .version = stripOutputSuffix(after_hash[i + 1 ..]) };1081        }1082    }1083    return .{ .name = after_hash, .version = "" };1084}10851086// Multi-output derivations append the output name to the store path (e.g.1087// curl-8.20.0-bin, less-692-man). Strip that suffix so the version column reads1088// as just the version.1089fn stripOutputSuffix(ver: []const u8) []const u8 {1090    const suffixes = [_][]const u8{ "-bin", "-man", "-dev", "-doc", "-lib", "-info", "-out", "-static", "-devdoc" };1091    for (suffixes) |s| {1092        if (std.mem.endsWith(u8, ver, s)) return ver[0 .. ver.len - s.len];1093    }1094    return ver;1095}10961097test "pkgFromStorePath splits name and version at first dash-digit" {1098    const a = pkgFromStorePath("/nix/store/abcdefghijklmnopqrstuvwxyz012345-ripgrep-15.1.0");1099    try std.testing.expectEqualStrings("ripgrep", a.name);1100    try std.testing.expectEqualStrings("15.1.0", a.version);11011102    const b = pkgFromStorePath("/nix/store/abcdefghijklmnopqrstuvwxyz012345-helix-25.01");1103    try std.testing.expectEqualStrings("helix", b.name);1104    try std.testing.expectEqualStrings("25.01", b.version);11051106    // multi-output store paths drop their output-name suffix1107    const c = pkgFromStorePath("/nix/store/abcdefghijklmnopqrstuvwxyz012345-curl-8.20.0-bin");1108    try std.testing.expectEqualStrings("curl", c.name);1109    try std.testing.expectEqualStrings("8.20.0", c.version);1110}11111112fn firstStorePath(el: std.json.Value) ?[]const u8 {1113    if (el != .object) return null;1114    const sp = el.object.get("storePaths") orelse return null;1115    if (sp != .array or sp.array.items.len == 0) return null;1116    const first = sp.array.items[0];1117    return if (first == .string) first.string else null;1118}11191120// `nix profile list --json` has two shapes across nix versions: newer keys each1121// element by name (object), older lists them positionally (array). Handle both.1122fn renderProfileJson(gpa: std.mem.Allocator, json: []const u8) void {1123    const parsed = std.json.parseFromSlice(std.json.Value, gpa, json, .{}) catch return;1124    defer parsed.deinit();1125    if (parsed.value != .object) return;1126    const elements = parsed.value.object.get("elements") orelse return;1127    switch (elements) {1128        .object => |obj| {1129            var it = obj.iterator();1130            while (it.next()) |entry| {1131                const ver = if (firstStorePath(entry.value_ptr.*)) |p| pkgFromStorePath(p).version else "";1132                output.listPkg(entry.key_ptr.*, ver);1133            }1134        },1135        .array => |arr| {1136            for (arr.items) |el| {1137                const path = firstStorePath(el) orelse continue;1138                const row = pkgFromStorePath(path);1139                output.listPkg(row.name, row.version);1140            }1141        },1142        else => {},1143    }1144}11451146pub fn tryCmd(ctx: Ctx) !void {1147    const pkg_name_arg = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1148    const shell_pkg = types.NixPackage{ .attr = pkg_name_arg, .pname = pkg_name_arg, .version = "", .description = "" };1149    try tryPkg(ctx, shell_pkg);1150}11511152// --- Home Manager commands ---11531154const home_help = [_][2][]const u8{1155    .{ "apply", "apply home-manager configuration" },1156    .{ "apply --dry", "preview changes without activating" },1157    .{ "back", "roll back one generation" },1158    .{ "history", "list all generations" },1159    .{ "edit", "open home.nix" },1160    .{ "check", "validate without applying" },1161    .{ "diff", "compare the latest two generations" },1162    .{ "packages", "list managed packages" },1163};11641165const HomeGen = struct {1166    number: u32,1167    date: []const u8,1168    time: []const u8,1169    path: []const u8,1170};11711172// `home-manager generations` lines read:1173//   2026-06-01 11:56 : id 765 -> /nix/store/<hash>-home-manager-generation1174// Newest first, so index 0 is the current generation.1175fn parseHomeGenerations(gpa: std.mem.Allocator, out_str: []const u8) ![]HomeGen {1176    var gens: std.ArrayList(HomeGen) = .empty;1177    var lines = std.mem.splitScalar(u8, out_str, '\n');1178    while (lines.next()) |line| {1179        const t = std.mem.trim(u8, line, " \t\r");1180        if (t.len == 0) continue;1181        var it = std.mem.tokenizeAny(u8, t, " \t");1182        const date = it.next() orelse continue;1183        const time = it.next() orelse continue;1184        var number: ?u32 = null;1185        var path: []const u8 = "";1186        while (it.next()) |tok| {1187            if (std.mem.eql(u8, tok, "id")) {1188                if (it.next()) |n| number = std.fmt.parseInt(u32, n, 10) catch null;1189            } else if (std.mem.startsWith(u8, tok, "/nix/store/")) {1190                path = tok;1191            }1192        }1193        const num = number orelse continue;1194        try gens.append(gpa, .{1195            .number = num,1196            .date = try gpa.dupe(u8, date),1197            .time = try gpa.dupe(u8, time),1198            .path = try gpa.dupe(u8, path),1199        });1200    }1201    return gens.toOwnedSlice(gpa);1202}12031204fn freeHomeGens(gpa: std.mem.Allocator, gens: []HomeGen) void {1205    for (gens) |g| {1206        gpa.free(g.date);1207        gpa.free(g.time);1208        gpa.free(g.path);1209    }1210    gpa.free(gens);1211}12121213test "parseHomeGenerations reads id, date and store path" {1214    const a = std.testing.allocator;1215    const sample =1216        \\2026-06-01 11:56 : id 765 -> /nix/store/aaaa-home-manager-generation1217        \\2026-05-31 10:29 : id 764 -> /nix/store/bbbb-home-manager-generation1218    ;1219    const gens = try parseHomeGenerations(a, sample);1220    defer freeHomeGens(a, gens);1221    try std.testing.expectEqual(@as(usize, 2), gens.len);1222    try std.testing.expectEqual(@as(u32, 765), gens[0].number);1223    try std.testing.expectEqualStrings("2026-06-01", gens[0].date);1224    try std.testing.expectEqualStrings("11:56", gens[0].time);1225    try std.testing.expectEqualStrings("/nix/store/aaaa-home-manager-generation", gens[0].path);1226    try std.testing.expectEqual(@as(u32, 764), gens[1].number);1227}12281229// Current (newest) home generation number, or 0 if unavailable.1230fn homeCurrentGen(ctx: Ctx) u32 {1231    const out = exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine) catch return 0;1232    defer ctx.gpa.free(out);1233    const gens = parseHomeGenerations(ctx.gpa, out) catch return 0;1234    defer freeHomeGens(ctx.gpa, gens);1235    return if (gens.len > 0) gens[0].number else 0;1236}12371238pub fn home(ctx: Ctx) !void {1239    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help"))1240        return output.subcommandHelp("home", &home_help, null);12411242    // Home Manager manages the local user's environment. Detection (which binary,1243    // ~/.config/home-manager, $HOME/$USER for the flake ref) all read the LOCAL1244    // host, while exec routes over SSH for a remote machine — so `home --on1245    // <remote>` would decide mode/flake-ref from the wrong box. Refuse it cleanly1246    // rather than acting on a mismatch.1247    if (!ctx.machine.local) {1248        output.homeLocalOnly(ctx.machine.name);1249        return;1250    }12511252    const mode = exec.detectHomeManager(ctx.gpa, ctx.io, ctx.environ);1253    if (mode == .none) {1254        output.homeNotInstalled();1255        return;1256    }12571258    // apply is the only command meaningful in module mode (it redirects to1259    // `nina apply`); everything else needs the standalone home-manager CLI.1260    if (std.mem.eql(u8, ctx.sub, "apply")) return homeApply(ctx, mode);1261    // edit just opens the local home.nix — fine in module mode too.1262    if (std.mem.eql(u8, ctx.sub, "edit")) return homeEdit(ctx);12631264    if (mode == .module) {1265        output.homeModuleManaged();1266        return;1267    }12681269    if (std.mem.eql(u8, ctx.sub, "back")) return homeBack(ctx);1270    if (std.mem.eql(u8, ctx.sub, "history")) return homeHistory(ctx);1271    if (std.mem.eql(u8, ctx.sub, "check")) return homeCheck(ctx);1272    if (std.mem.eql(u8, ctx.sub, "diff")) return homeDiff(ctx);1273    if (std.mem.eql(u8, ctx.sub, "packages")) return homePackages(ctx);12741275    return output.subcommandHelp("home", &home_help, null);1276}12771278fn homePackages(ctx: Ctx) !void {1279    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1280    defer ctx.gpa.free(out);1281    const gens = try parseHomeGenerations(ctx.gpa, out);1282    defer freeHomeGens(ctx.gpa, gens);12831284    output.homePackagesHeader(ctx.machine.name);1285    if (gens.len == 0 or gens[0].path.len == 0) return;12861287    // The generation's OWN references are home-manager's activation deps1288    // (bash, coreutils, ...), not what the user installed. The user's packages1289    // live one level down, in the `…-home-manager-path` env the generation1290    // references — descend into it and list ITS references. Fall back to the1291    // generation refs if that env isn't present (older home-manager layouts).1292    const gen_refs = exec.homeGenerationReferences(ctx.gpa, ctx.io, &ctx.machine, gens[0].path) catch return;1293    defer ctx.gpa.free(gen_refs);12941295    var refs = gen_refs;1296    var env_refs: ?[]u8 = null;1297    defer if (env_refs) |e| ctx.gpa.free(e);1298    if (findHomeManagerPath(gen_refs)) |pkg_path| {1299        if (exec.homeGenerationReferences(ctx.gpa, ctx.io, &ctx.machine, pkg_path)) |e| {1300            env_refs = e;1301            refs = e;1302        } else |_| {}1303    }13041305    // Dedup by name: multi-output derivations (jq, jq-lib, jq-doc) collapse to1306    // the same name after the output suffix is stripped. Keys are slices into1307    // `refs`, valid for this function's lifetime.1308    var seen = std.StringHashMap(void).init(ctx.gpa);1309    defer seen.deinit();1310    var lines = std.mem.splitScalar(u8, refs, '\n');1311    while (lines.next()) |line| {1312        const t = std.mem.trim(u8, line, " \t\r");1313        if (t.len == 0) continue;1314        const row = pkgFromStorePath(t);1315        if (row.version.len == 0) continue;1316        if (std.mem.indexOf(u8, row.name, "home-manager") != null) continue;1317        if (seen.contains(row.name)) continue;1318        seen.put(row.name, {}) catch {};1319        output.listPkg(row.name, row.version);1320    }1321}13221323// The `…-home-manager-path` env among a generation's references — the buildEnv1324// of the user's home.packages. Returns the full store-path line, or null.1325fn findHomeManagerPath(refs: []const u8) ?[]const u8 {1326    var lines = std.mem.splitScalar(u8, refs, '\n');1327    while (lines.next()) |line| {1328        const t = std.mem.trim(u8, line, " \t\r");1329        if (std.mem.indexOf(u8, t, "home-manager-path") != null) return t;1330    }1331    return null;1332}13331334test "findHomeManagerPath picks the env, not the generation or infra" {1335    const refs =1336        \\/nix/store/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-bash-5.31337        \\/nix/store/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb-home-manager-path1338        \\/nix/store/cccccccccccccccccccccccccccccccc-coreutils-9.111339    ;1340    try std.testing.expectEqualStrings(1341        "/nix/store/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb-home-manager-path",1342        findHomeManagerPath(refs).?,1343    );1344    try std.testing.expectEqual(@as(?[]const u8, null), findHomeManagerPath("/nix/store/x-bash-5.3\n"));1345}13461347fn homeDiff(ctx: Ctx) !void {1348    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1349    defer ctx.gpa.free(out);1350    const gens = try parseHomeGenerations(ctx.gpa, out);1351    defer freeHomeGens(ctx.gpa, gens);13521353    // Need two generations and both their store paths to diff their closures.1354    if (gens.len < 2 or gens[0].path.len == 0 or gens[1].path.len == 0) {1355        output.homeNothingToDiff();1356        return;1357    }1358    const newer = gens[0];1359    const older = gens[1];1360    output.homeDiffHeader(older.number, newer.number, ctx.machine.name);1361    if (try exec.diffClosuresPaths(ctx.io, &ctx.machine, ctx.gpa, older.path, newer.path) != 0)1362        return error.ProcessFailed;1363}13641365fn homeCheck(ctx: Ctx) !void {1366    output.homeCheckStart(ctx.machine.name);1367    const code = try exec.homeManagerBuild(ctx.io, &ctx.machine, ctx.gpa);1368    if (code != 0) return error.BuildFailed;1369    output.homeCheckOk();1370}13711372fn homeEdit(ctx: Ctx) !void {1373    // Standalone home config lives at ~/.config/home-manager/home.nix; the same1374    // path is what detection keys on for module mode, so it resolves for both.1375    const path = exec.homeNixPath(ctx.gpa, ctx.environ) orelse {1376        errors.error_info.setMessage("could not resolve ~/.config/home-manager/home.nix", .{});1377        return error.ConfigNotFound;1378    };1379    defer ctx.gpa.free(path);1380    output.homeEditOpen(path, ctx.cfg.editor);1381    _ = try exec.openEditor(ctx.io, ctx.gpa, ctx.cfg.editor, path, null);1382}13831384fn homeHistory(ctx: Ctx) !void {1385    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1386    defer ctx.gpa.free(out);1387    const gens = try parseHomeGenerations(ctx.gpa, out);1388    defer freeHomeGens(ctx.gpa, gens);1389    output.homeHistoryHeader(ctx.machine.name);1390    // Newest-first from home-manager; the first row is the current generation.1391    for (gens, 0..) |g, i| output.homeHistoryRow(g.number, g.date, g.time, i == 0);1392}13931394fn homeBack(ctx: Ctx) !void {1395    const out = try exec.homeGenerations(ctx.gpa, ctx.io, &ctx.machine);1396    defer ctx.gpa.free(out);1397    const gens = try parseHomeGenerations(ctx.gpa, out);1398    defer freeHomeGens(ctx.gpa, gens);13991400    // Newest-first: [0] is current, [1] is the generation to roll back to.1401    if (gens.len < 2) {1402        output.alreadyOldest();1403        return;1404    }1405    const current = gens[0].number;1406    const prev = gens[1].number;14071408    output.homeBackStart(ctx.machine.name, current, prev);1409    if (ctx.cfg.confirm and !output.confirm("")) return;1410    const code = try exec.homeManagerRollback(ctx.io, &ctx.machine, ctx.gpa);1411    if (code != 0) return error.BuildFailed;1412    output.homeBackDone(prev);1413}14141415fn homeApply(ctx: Ctx, mode: exec.HomeManagerMode) !void {1416    // NixOS/flake module: home config is rebuilt by nixos-rebuild — redirect.1417    if (mode == .module) {1418        output.homeModuleManaged();1419        return;1420    }1421    if (ctx.dry) {1422        output.homeApplyDry(ctx.machine.name);1423        const code = try exec.homeManagerBuild(ctx.io, &ctx.machine, ctx.gpa);1424        if (code != 0) return error.BuildFailed;1425        output.homeApplyDryDone();1426        return;1427    }14281429    if (!try runPreHook(ctx, "pre-home")) {1430        output.aborted();1431        return error.HookAborted;1432    }14331434    output.homeApplyStart(ctx.machine.name);1435    const flake_ref = exec.homeFlakeRef(ctx.gpa, ctx.io, ctx.environ);1436    defer if (flake_ref) |r| ctx.gpa.free(r);1437    if (flake_ref) |ref| {1438        output.printSubstep("home-manager switch --flake {s}", .{ref});1439    } else {1440        output.printSubstep("home-manager switch", .{});1441    }14421443    const start = std.Io.Clock.awake.now(ctx.io);1444    const code = if (flake_ref) |ref|1445        try exec.homeManagerSwitchFlake(ctx.io, &ctx.machine, ctx.gpa, ref)1446    else1447        try exec.homeManagerSwitch(ctx.io, &ctx.machine, ctx.gpa);1448    if (code != 0) return error.BuildFailed;14491450    const elapsed_ns = @max(0, start.untilNow(ctx.io, .awake).toNanoseconds());1451    const elapsed: u64 = @intCast(@divFloor(elapsed_ns, 1_000_000));1452    output.homeApplyDone(homeCurrentGen(ctx), elapsed);1453    runPostHook(ctx, "post-home");1454}14551456// --- Service commands ---14571458const service_help = [_][2][]const u8{1459    .{ "list", "list running services" },1460    .{ "logs <svc>", "show service logs" },1461    .{ "status <svc>", "service status" },1462    .{ "start <svc>", "start a service" },1463    .{ "stop <svc>", "stop a service" },1464    .{ "restart <svc>", "restart a service" },1465    .{ "enable <svc>", "enable at boot" },1466    .{ "disable <svc>", "disable at boot" },1467};14681469pub fn service(ctx: Ctx) !void {1470    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");1471    if (std.mem.eql(u8, ctx.sub, "list")) {1472        output.serviceListHeader(ctx.machine.name);1473        const svcs = exec.serviceList(ctx.gpa, ctx.io, &ctx.machine, ctx.user) catch &.{};1474        defer ctx.gpa.free(svcs);1475        for (svcs) |s| output.serviceRow(s);1476        return;1477    }1478    if (std.mem.eql(u8, ctx.sub, "logs")) {1479        const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1480        const follow = ctx.args.len > 1 and std.mem.eql(u8, ctx.args[1], "-f");1481        output.serviceLogsHeader(name, ctx.last, ctx.machine.name);1482        _ = try exec.serviceLogs(ctx.io, &ctx.machine, ctx.gpa, name, ctx.last, follow, ctx.user);1483        return;1484    }1485    if (std.mem.eql(u8, ctx.sub, "status")) {1486        const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1487        output.serviceVerb("status", name, ctx.machine.name);1488        _ = try exec.serviceCtl(ctx.io, &ctx.machine, ctx.gpa, "status", name, ctx.user);1489        return;1490    }1491    // start/stop/restart/enable/disable1492    const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1493    if (ctx.cfg.confirm and (std.mem.eql(u8, ctx.sub, "stop") or std.mem.eql(u8, ctx.sub, "disable"))) {1494        if (!output.confirm("")) return;1495    }1496    output.serviceVerb(ctx.sub, name, ctx.machine.name);1497    _ = try exec.serviceCtl(ctx.io, &ctx.machine, ctx.gpa, ctx.sub, name, ctx.user);1498    output.serviceDone();1499}15001501// --- Flake commands ---15021503const flake_help = [_][2][]const u8{1504    .{ "init", "create a new flake.nix" },1505    .{ "update", "update flake inputs" },1506    .{ "update <in>", "update a specific input" },1507    .{ "check", "validate the flake" },1508    .{ "show", "inspect flake outputs" },1509    .{ "lock", "regenerate flake.lock" },1510    .{ "clone <url>", "clone a flake repository" },1511};15121513pub fn flake(ctx: Ctx) !void {1514    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("flake", &flake_help, null);1515    if (std.mem.eql(u8, ctx.sub, "update")) {1516        output.flakeUpdateStart();1517        const input: ?[]const u8 = if (ctx.args.len > 0) ctx.args[0] else null;1518        _ = try exec.flakeUpdate(ctx.io, &ctx.machine, ctx.gpa, input);1519        output.flakeLockWritten();1520        return;1521    }1522    if (std.mem.eql(u8, ctx.sub, "check")) {1523        output.flakeCheckStart();1524        const code = try exec.flakeCheck(ctx.io, &ctx.machine, ctx.gpa);1525        if (code == 0) output.flakeValid() else output.checkFailed("");1526        return;1527    }1528    if (std.mem.eql(u8, ctx.sub, "show")) {1529        const json_out = exec.flakeShow(ctx.gpa, ctx.io, &ctx.machine) catch null;1530        if (json_out) |j| {1531            defer ctx.gpa.free(j);1532            output.flakeShowHeader("flake outputs");1533            // Parse and display the flake outputs1534            const parsed = std.json.parseFromSlice(std.json.Value, ctx.gpa, j, .{}) catch return;1535            defer parsed.deinit();1536            if (parsed.value == .object) {1537                var it = parsed.value.object.iterator();1538                while (it.next()) |entry| {1539                    if (entry.value_ptr.* == .object) {1540                        var inner = entry.value_ptr.object.iterator();1541                        while (inner.next()) |e2| {1542                            const desc = if (e2.value_ptr.* == .object)1543                                if (e2.value_ptr.object.get("description")) |d|1544                                    if (d == .string) d.string else ""1545                                else1546                                    ""1547                            else1548                                "";1549                            output.flakeShowEntry(entry.key_ptr.*, e2.key_ptr.*, desc);1550                        }1551                    }1552                }1553            }1554        }1555        return;1556    }1557    if (std.mem.eql(u8, ctx.sub, "init")) {1558        _ = try exec.flakeInit(ctx.io, &ctx.machine, ctx.gpa);1559        return;1560    }1561    if (std.mem.eql(u8, ctx.sub, "lock")) {1562        _ = try exec.flakeLock(ctx.io, &ctx.machine, ctx.gpa);1563        return;1564    }1565    if (std.mem.eql(u8, ctx.sub, "clone")) {1566        const url = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1567        _ = try exec.flakeClone(ctx.io, &ctx.machine, ctx.gpa, url);1568        return;1569    }1570}15711572// --- Store commands ---15731574const store_help = [_][2][]const u8{1575    .{ "info", "store size and counts" },1576    .{ "path <attr>", "store path of a package" },1577    .{ "gc", "collect garbage" },1578    .{ "verify", "verify store integrity" },1579    .{ "repair", "repair corrupted paths" },1580};15811582pub fn store(ctx: Ctx) !void {1583    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("store", &store_help, null);1584    if (std.mem.eql(u8, ctx.sub, "gc")) {1585        _ = try exec.storeGc(ctx.io, &ctx.machine, ctx.gpa);1586        return;1587    }1588    if (std.mem.eql(u8, ctx.sub, "verify")) {1589        output.storeVerifyStart();1590        _ = try exec.storeVerify(ctx.io, &ctx.machine, ctx.gpa);1591        return;1592    }1593    if (std.mem.eql(u8, ctx.sub, "repair")) {1594        if (ctx.cfg.confirm and !output.confirm("")) return;1595        output.storeRepairStart();1596        _ = try exec.storeRepair(ctx.io, &ctx.machine, ctx.gpa);1597        return;1598    }1599    if (std.mem.eql(u8, ctx.sub, "info")) {1600        const si = try exec.storeInfo(ctx.gpa, ctx.io, &ctx.machine);1601        output.storeInfo(si);1602        return;1603    }1604    if (std.mem.eql(u8, ctx.sub, "path")) {1605        const attr = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1606        const path = try exec.storePath(ctx.gpa, ctx.io, &ctx.machine, attr);1607        defer ctx.gpa.free(path);1608        output.storePath(path);1609        return;1610    }1611    // default: info1612    const si = try exec.storeInfo(ctx.gpa, ctx.io, &ctx.machine);1613    output.storeInfo(si);1614}16151616// --- Channel commands ---16171618const channel_help = [_][2][]const u8{1619    .{ "list", "list channels" },1620    .{ "add <url> [name]", "add a channel" },1621    .{ "remove <name>", "remove a channel" },1622    .{ "update", "update all channels" },1623};16241625pub fn channel(ctx: Ctx) !void {1626    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("channel", &channel_help, null);1627    // On a flake-managed system, nix-channel operations generally don't apply.1628    if (flakeSystem(ctx)) output.flakeChannelNote();1629    if (std.mem.eql(u8, ctx.sub, "list")) {1630        output.channelListHeader(ctx.machine.name);1631        const chans = try exec.channelList(ctx.gpa, ctx.io, &ctx.machine);1632        defer ctx.gpa.free(chans);1633        for (chans) |ch| output.channelRow(ch);1634        return;1635    }1636    if (std.mem.eql(u8, ctx.sub, "add")) {1637        const url = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1638        const name = if (ctx.args.len > 1) ctx.args[1] else "";1639        _ = try exec.channelAdd(ctx.io, &ctx.machine, ctx.gpa, url, name);1640        output.channelDone();1641        return;1642    }1643    if (std.mem.eql(u8, ctx.sub, "remove")) {1644        const name = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1645        _ = try exec.channelRemove(ctx.io, &ctx.machine, ctx.gpa, name);1646        output.channelDone();1647        return;1648    }1649    if (std.mem.eql(u8, ctx.sub, "update")) {1650        return channelUpdateCmd(ctx);1651    }1652}16531654// --- Profile commands ---16551656pub fn profile(ctx: Ctx) !void {1657    if (std.mem.eql(u8, ctx.sub, "list") or ctx.sub.len == 0) {1658        output.profileListHeader();1659        const out = exec.profileList(ctx.gpa, ctx.io, &ctx.machine) catch null;1660        if (out) |o| {1661            defer ctx.gpa.free(o);1662            var lines = std.mem.splitScalar(u8, o, '\n');1663            while (lines.next()) |line| {1664                const t = std.mem.trim(u8, line, " \t\r");1665                if (t.len == 0) continue;1666                output.profileRow(t, "", "");1667            }1668        }1669        return;1670    }1671    if (std.mem.eql(u8, ctx.sub, "install")) {1672        const attr = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1673        _ = try exec.profileInstall(ctx.io, &ctx.machine, ctx.gpa, attr);1674        output.done();1675        return;1676    }1677    if (std.mem.eql(u8, ctx.sub, "remove")) {1678        const attr = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1679        _ = try exec.profileRemove(ctx.io, &ctx.machine, ctx.gpa, attr);1680        output.done();1681        return;1682    }1683    if (std.mem.eql(u8, ctx.sub, "upgrade")) {1684        _ = try exec.profileUpgrade(ctx.io, &ctx.machine, ctx.gpa);1685        output.done();1686        return;1687    }1688}16891690// --- Pkg commands ---16911692const pkg_help = [_][2][]const u8{1693    .{ "why <pkg>", "what pulled it in" },1694    .{ "deps <pkg>", "direct dependencies" },1695    .{ "size <pkg>", "closure size" },1696    .{ "path <pkg>", "store path" },1697    .{ "closure <pkg>", "full closure" },1698};16991700pub fn pkg(ctx: Ctx) !void {1701    if (ctx.sub.len == 0 or std.mem.eql(u8, ctx.sub, "help")) return output.subcommandHelp("pkg", &pkg_help, null);1702    const name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1703    if (std.mem.eql(u8, ctx.sub, "why")) {1704        if (try exec.pkgWhy(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;1705        return;1706    }1707    if (std.mem.eql(u8, ctx.sub, "deps")) {1708        if (try exec.pkgDeps(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;1709        return;1710    }1711    if (std.mem.eql(u8, ctx.sub, "size")) {1712        const s = try exec.pkgSize(ctx.gpa, ctx.io, &ctx.machine, name);1713        defer ctx.gpa.free(s);1714        output.pkgResult("size", s);1715        return;1716    }1717    if (std.mem.eql(u8, ctx.sub, "path")) {1718        const p = try exec.storePath(ctx.gpa, ctx.io, &ctx.machine, name);1719        defer ctx.gpa.free(p);1720        output.pkgResult("path", p);1721        return;1722    }1723    if (std.mem.eql(u8, ctx.sub, "closure")) {1724        if (try exec.pkgClosure(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;1725        return;1726    }1727}17281729// Top-level alias for `nina pkg why <pkg>` — surfaces what pulled a package in1730// without the user needing to know about the `pkg` subgroup.1731pub fn why(ctx: Ctx) !void {1732    const name = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1733    if (try exec.pkgWhy(ctx.io, &ctx.machine, ctx.gpa, name) != 0) return error.PackageNotFound;1734}17351736// --- Pin / Unpin ---17371738pub fn pin(ctx: Ctx) !void {1739    const input = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1740    const commit = if (ctx.args.len > 1) ctx.args[1] else return error.Internal;1741    exec.editFlakeLock(ctx.gpa, input, commit) catch return error.ProcessFailed;1742    output.pinDone(input, commit);1743}17441745pub fn unpin(ctx: Ctx) !void {1746    const input = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1747    _ = try exec.flakeUpdate(ctx.io, &ctx.machine, ctx.gpa, input);1748    output.unpinDone(input);1749}17501751// --- Hash / Fetch ---17521753pub fn hash(ctx: Ctx) !void {1754    const path = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1755    const h = try exec.nixHash(ctx.gpa, ctx.io, &ctx.machine, path);1756    defer ctx.gpa.free(h);1757    output.hashResult(std.mem.trim(u8, h, " \t\n\r"));1758}17591760pub fn fetch(ctx: Ctx) !void {1761    const url = if (ctx.args.len > 0) ctx.args[0] else return error.Internal;1762    const h = try exec.nixFetch(ctx.gpa, ctx.io, &ctx.machine, url);1763    defer ctx.gpa.free(h);1764    output.fetchResult(std.mem.trim(u8, h, " \t\n\r"), url);1765}17661767// --- Build / Run ---17681769pub fn build(ctx: Ctx) !void {1770    const attr: ?[]const u8 = if (ctx.args.len > 0) ctx.args[0] else null;1771    output.buildStart(attr orelse "default");1772    const code = try exec.nixBuild(ctx.io, &ctx.machine, ctx.gpa, attr);1773    if (code != 0) return error.BuildFailed;1774    output.buildDone();1775}17761777pub fn runCmd(ctx: Ctx) !void {1778    const pkg_arg = if (ctx.args.len > 0) ctx.args[0] else return error.PackageNotFound;1779    output.runStart(pkg_arg);1780    _ = try exec.nixRun(ctx.io, &ctx.machine, ctx.gpa, pkg_arg);1781}17821783// --- Hello ---17841785pub fn hello(ctx: Ctx) !void {1786    output.hello(ctx.cfg.machines);1787}17881789const ConfigKind = enum { flake, channel, none };17901791// Scan the conventional /etc/nixos for a flake.nix (flake-based) or a1792// configuration.nix (channel-based) to pre-fill the wizard's defaults.1793fn scanConfig(io: std.Io) ConfigKind {1794    if (exec.pathExists(io, "/etc/nixos/flake.nix")) return .flake;1795    if (exec.pathExists(io, "/etc/nixos/configuration.nix")) return .channel;1796    return .none;1797}17981799// Runs when the config is absent on first invocation (interactive TTY only).1800// Scans for an existing nixos config, detects flake vs channel, and offers a1801// smart default path — flake-ness is detected, never asked.1802pub fn firstRunWizard(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) !void {1803    output.firstRunBanner();1804    output.firstRunNoConfig();18051806    var name_buf: [256]u8 = undefined;1807    var path_buf: [256]u8 = undefined;18081809    const machine_name = output.firstRunPrompt("machine name", "my-machine", &name_buf);18101811    output.firstRunScanning();1812    const kind = scanConfig(io);1813    switch (kind) {1814        .flake => output.firstRunDetected("/etc/nixos/flake.nix", true),1815        .channel => output.firstRunDetected("/etc/nixos/configuration.nix", false),1816        .none => output.firstRunNoneFound(),1817    }18181819    // Detected systems default to /etc/nixos (press enter to confirm); when1820    // nothing was found, leave the default empty so the user must type a path.1821    const default_path: []const u8 = if (kind == .none) "" else "/etc/nixos";1822    const config_path = output.firstRunPromptDefault("config path", default_path, kind != .none, &path_buf);18231824    // Re-detect at the chosen path in case the user pointed elsewhere — flake.nix1825    // there means a flake system, recorded so channel commands warn appropriately.1826    const use_flakes = exec.dirHasFlake(gpa, io, config_path);18271828    const conf_path = try config.configPath(gpa, environ);1829    defer gpa.free(conf_path);1830    if (std.fs.path.dirname(conf_path)) |dir| exec.ensureDir(gpa, io, dir);18311832    // `flake` is a top-level config field, so it must precede the [machine] block.1833    const flake_line = if (use_flakes) "flake = true\n" else "";1834    var content_buf: [1024]u8 = undefined;1835    const content = try std.fmt.bufPrint(1836        &content_buf,1837        "{s}[machine]\nname = {s}\nconfig = {s}\nlocal = true\n",1838        .{ flake_line, machine_name, config_path },1839    );18401841    const file = std.Io.Dir.createFile(.cwd(), io, conf_path, .{}) catch {1842        errors.error_info.setMessage("could not write {s}", .{conf_path});1843        return error.Internal;1844    };1845    defer file.close(io);1846    file.writePositionalAll(io, content, 0) catch {1847        errors.error_info.setMessage("could not write {s}", .{conf_path});1848        return error.Internal;1849    };18501851    output.firstRunWritten(conf_path);1852}18531854pub fn setup(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) !void {1855    // Create the config first if it doesn't exist. This makes `nina setup`1856    // a complete onboarding command — not just a nix-features check. Any legacy1857    // ~/.nina.conf is migrated to the XDG path before we decide to run the wizard.1858    config.migrateLegacyConfig(gpa, io, environ);1859    if (config.configPath(gpa, environ)) |conf_path| {1860        defer gpa.free(conf_path);1861        if (std.Io.Dir.openFile(.cwd(), io, conf_path, .{})) |f| {1862            f.close(io);1863        } else |_| {1864            try firstRunWizard(gpa, io, environ);1865            errors.error_info.reset();1866        }1867    } else |_| {}18681869    output.setupCheck();1870    const status = exec.checkNixFeatures(gpa, io, environ);1871    output.setupFeatures(status.nix_command, status.flakes);18721873    if (status.allEnabled()) {1874        output.setupAllSet();1875        api.ensureRegistryPinned(gpa, io, environ);1876        return;1877    }18781879    // On NixOS the features belong in configuration.nix (the declarative,1880    // permanent home), not ~/.config/nix/nix.conf. Offer to add the one line;1881    // the user runs the rebuild. We don't pin the registry here because the1882    // features aren't live until that rebuild lands.1883    if (exec.isNixOS(io)) {1884        const conf_path = "/etc/nixos/configuration.nix";1885        if (exec.nixosConfigEnablesFeatures(gpa, io, conf_path)) {1886            output.setupNixosNeedsRebuild(conf_path);1887            return;1888        }1889        output.setupNixosOffer(exec.NIXOS_FEATURES_LINE, conf_path);1890        if (output.confirmDefaultNo("add it now?")) {1891            if (exec.appendFeaturesToNixosConfig(gpa, io, environ, conf_path)) |_| {1892                output.setupNixosWrote(conf_path);1893            } else |_| {1894                output.setupNixosManual(exec.NIXOS_FEATURES_LINE, conf_path);1895            }1896        } else {1897            output.setupNixosManual(exec.NIXOS_FEATURES_LINE, conf_path);1898        }1899        return;1900    }19011902    // Non-NixOS: a user-level nix.conf takes effect immediately, no sudo needed.1903    output.setupEnabling();1904    const path = try exec.enableNixFeatures(gpa, io, environ);1905    defer gpa.free(path);19061907    output.setupDone(path);1908    api.ensureRegistryPinned(gpa, io, environ);1909}19101911// --- Log helper ---19121913fn logAction(ctx: Ctx, action: []const u8, gen: u32) void {1914    var ts_buf: [32]u8 = undefined;1915    const ts = nowIso(ctx.io, &ts_buf);1916    var buf: [256]u8 = undefined;1917    const entry = std.fmt.bufPrint(&buf, "{{\"ts\":\"{s}\",\"machine\":\"{s}\",\"command\":\"{s}\",\"outcome\":\"success\",\"gen_before\":null,\"gen_after\":{d},\"duration_ms\":0}}\n", .{1918        ts, ctx.machine.name, action, gen,1919    }) catch return;1920    exec.appendNinaLog(ctx.io, ctx.environ, entry);1921}19221923// Wall-clock UTC as ISO-8601. Uses Io.Clock.real (the settable Unix-epoch clock);1924// Io.Clock.awake is monotonic and unsuitable for timestamps. Falls back to epoch 0.1925fn nowIso(io: std.Io, buf: []u8) []const u8 {1926    const fallback = "1970-01-01T00:00:00Z";1927    const ns = std.Io.Clock.real.now(io).toNanoseconds();1928    if (ns <= 0) return fallback;1929    const secs: u64 = @intCast(@divFloor(ns, 1_000_000_000));1930    const es = std.time.epoch.EpochSeconds{ .secs = secs };1931    const ed = es.getEpochDay();1932    const yd = ed.calculateYearDay();1933    const md = yd.calculateMonthDay();1934    const ds = es.getDaySeconds();1935    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", .{1936        yd.year,              md.month.numeric(),      @as(u32, md.day_index) + 1,1937        ds.getHoursIntoDay(), ds.getMinutesIntoHour(), ds.getSecondsIntoMinute(),1938    }) catch return fallback;1939}