exec.zig

1// exec.zig — all process execution and SSH routing2// Commands call these functions; output is streamed or captured here.3const std = @import("std");4const builtin = @import("builtin");5const types = @import("types.zig");6const errors = @import("errors.zig");7const output = @import("output.zig");89// nixos-rebuild manages this profile; generation commands must target it10// explicitly. Bare nix-env defaults to the per-user profile, which is empty.11const SYSTEM_PROFILE = "/nix/var/nix/profiles/system";1213pub const RunResult = struct {14    stdout: []u8,15    stderr: []u8,16    exit_code: u8,17};1819pub const HookResult = enum {20    ok,21    failed,22    not_found,23};2425pub const HookRun = struct {26    result: HookResult,27    exit_code: u8 = 0,28    output: []u8,29};3031// Run a process and capture stdout+stderr (not streaming).32pub fn capture(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, cmd: []const []const u8) !RunResult {33    const argv = try buildArgv(gpa, machine, cmd);34    defer if (!machine.local) gpa.free(argv);3536    const result = std.process.run(gpa, io, .{ .argv = argv }) catch |e| {37        errors.error_info.setMessage("process failed: {s}", .{cmd[0]});38        return e;39    };4041    return .{42        .stdout = result.stdout,43        .stderr = result.stderr,44        .exit_code = switch (result.term) {45            .exited => |c| c,46            else => 1,47        },48    };49}5051// Run a process and stream its output to the terminal (inherit stdio).52pub fn stream(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, cmd: []const []const u8) !u8 {53    // The child inherits stdout and writes directly to the fd; flush any buffered54    // nina header first so it isn't reordered after the child's output.55    output.flush();56    const argv = try buildArgv(gpa, machine, cmd);57    defer if (!machine.local) gpa.free(argv);5859    var child = std.process.spawn(io, .{60        .argv = argv,61        .stdin = .inherit,62        .stdout = .inherit,63        .stderr = .inherit,64    }) catch |e| {65        errors.error_info.setMessage("failed to spawn: {s}", .{cmd[0]});66        return e;67    };6869    const term = child.wait(io) catch |e| {70        errors.error_info.setMessage("process wait failed", .{});71        return e;72    };7374    return switch (term) {75        .exited => |c| c,76        else => 1,77    };78}7980// Stream a process with an overridden PS1 in the child environment.81fn streamEnv(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, cmd: []const []const u8, base_env: *const std.process.Environ.Map, ps1: []const u8) !u8 {82    output.flush();83    const argv = try buildArgv(gpa, machine, cmd);84    defer if (!machine.local) gpa.free(argv);8586    var env = try base_env.clone(gpa);87    defer env.deinit();88    try env.put("PS1", ps1);89    try env.put("NINA_PS1", ps1);9091    var child = std.process.spawn(io, .{92        .argv = argv,93        .stdin = .inherit,94        .stdout = .inherit,95        .stderr = .inherit,96        .environ_map = &env,97    }) catch |e| {98        errors.error_info.setMessage("failed to spawn: {s}", .{cmd[0]});99        return e;100    };101102    const term = child.wait(io) catch |e| {103        errors.error_info.setMessage("process wait failed", .{});104        return e;105    };106107    return switch (term) {108        .exited => |c| c,109        else => 1,110    };111}112113fn createInteractiveShellRc(gpa: std.mem.Allocator, io: std.Io) ![]u8 {114    const out = try captureLocal(gpa, io, &.{ "mktemp", "/tmp/nina-shell-rc.XXXXXX" });115    defer gpa.free(out);116117    const path = std.mem.trim(u8, out, " \t\r\n");118    if (path.len == 0) return error.FileNotFound;119    const owned_path = try gpa.dupe(u8, path);120    errdefer gpa.free(owned_path);121122    const file = std.Io.Dir.createFile(.cwd(), io, owned_path, .{}) catch {123        errors.error_info.setMessage("could not write shell prompt setup", .{});124        return error.FileNotFound;125    };126    errdefer file.close(io);127128    const content =129        \\PS1="${NINA_PS1:-$PS1}"130        \\trap 'exit 130' INT131        \\132    ;133    file.writePositionalAll(io, content, 0) catch {134        errors.error_info.setMessage("could not write shell prompt setup", .{});135        return error.FileNotFound;136    };137    file.close(io);138139    return owned_path;140}141142// Stream a local process with inherited stdio (no SSH routing — for nix commands).143pub fn streamLocal(io: std.Io, cmd: []const []const u8) !u8 {144    output.flush();145    var child = std.process.spawn(io, .{146        .argv = cmd,147        .stdin = .inherit,148        .stdout = .inherit,149        .stderr = .inherit,150    }) catch |e| {151        errors.error_info.setMessage("failed to spawn: {s}", .{cmd[0]});152        return e;153    };154    const term = child.wait(io) catch {155        errors.error_info.setMessage("process wait failed", .{});156        return error.ProcessFailed;157    };158    return switch (term) {159        .exited => |c| c,160        else => 1,161    };162}163164// Run a process and capture output as a single string (no SSH routing — for local nix commands).165pub fn captureLocal(gpa: std.mem.Allocator, io: std.Io, cmd: []const []const u8) ![]u8 {166    const result = std.process.run(gpa, io, .{ .argv = cmd }) catch return error.ProcessFailed;167    defer gpa.free(result.stderr);168    switch (result.term) {169        .exited => |c| if (c != 0) {170            gpa.free(result.stdout);171            return error.ProcessFailed;172        },173        else => {174            gpa.free(result.stdout);175            return error.ProcessFailed;176        },177    }178    return result.stdout;179}180181// Create a directory and its parents, best-effort. Shelling out to `mkdir -p`182// matches how the rest of exec.zig provisions config locations (~/.config/nix).183pub fn ensureDir(gpa: std.mem.Allocator, io: std.Io, dir: []const u8) void {184    _ = captureLocal(gpa, io, &.{ "mkdir", "-p", dir }) catch {};185}186187// Optional user hooks live in ~/.config/nina/hooks and must be executable.188// They are always local: hooks protect the user's local workflow before nina189// starts state-changing work.190pub fn runHook(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map, hook_name: []const u8) !HookRun {191    const home = environ.get("HOME") orelse return .{192        .result = .not_found,193        .output = try gpa.dupe(u8, ""),194    };195196    const hook_dir = try std.fs.path.join(gpa, &.{ home, ".config", "nina", "hooks" });197    defer gpa.free(hook_dir);198    ensureDir(gpa, io, hook_dir);199200    const hook_path = try std.fs.path.join(gpa, &.{ hook_dir, hook_name });201    defer gpa.free(hook_path);202203    const executable = std.process.run(gpa, io, .{ .argv = &.{ "sh", "-c", "test -x \"$1\"", "nina-hook-check", hook_path } }) catch return .{204        .result = .not_found,205        .output = try gpa.dupe(u8, ""),206    };207    defer gpa.free(executable.stdout);208    defer gpa.free(executable.stderr);209    const is_executable = switch (executable.term) {210        .exited => |code| code == 0,211        else => false,212    };213    if (!is_executable) return .{214        .result = .not_found,215        .output = try gpa.dupe(u8, ""),216    };217218    const tmp_raw = try captureLocal(gpa, io, &.{ "mktemp", "/tmp/nina-hook.XXXXXX" });219    defer gpa.free(tmp_raw);220    const tmp_output = std.mem.trim(u8, tmp_raw, " \t\r\n");221    defer if (std.fs.path.isAbsolute(tmp_output)) std.Io.Dir.deleteFileAbsolute(io, tmp_output) catch {};222223    const result = try std.process.run(gpa, io, .{224        .argv = &.{225            "sh",226            "-c",227            "$1 > \"$2\" 2>&1; code=$?; tail -c 4096 \"$2\"; exit \"$code\"",228            "nina-hook-run",229            hook_path,230            tmp_output,231        },232        .stdout_limit = .limited(4096),233        .stderr_limit = .limited(512),234    });235    defer gpa.free(result.stdout);236    defer gpa.free(result.stderr);237238    const exit_code = switch (result.term) {239        .exited => |code| code,240        else => 1,241    };242    return .{243        .result = if (exit_code == 0) .ok else .failed,244        .exit_code = exit_code,245        .output = try std.fmt.allocPrint(gpa, "{s}{s}", .{ result.stdout, result.stderr }),246    };247}248249test "runHook ignores non-executable hooks and captures failures" {250    const a = std.testing.allocator;251    const io = std.testing.io;252253    var tmp = std.testing.tmpDir(.{});254    defer tmp.cleanup();255256    const home = try std.fmt.allocPrint(a, ".zig-cache/tmp/{s}", .{&tmp.sub_path});257    defer a.free(home);258259    var env: std.process.Environ.Map = .init(a);260    defer env.deinit();261    try env.put("HOME", home);262263    var hook_dir = try tmp.dir.createDirPathOpen(io, ".config/nina/hooks", .{});264    defer hook_dir.close(io);265266    const script =267        \\#!/bin/sh268        \\echo hook says no269        \\echo detail >&2270        \\exit 3271        \\272    ;273    {274        const file = try hook_dir.createFile(io, "pre-apply", .{});275        defer file.close(io);276        try file.writePositionalAll(io, script, 0);277        try file.setPermissions(io, .fromMode(0o644));278    }279280    const missing = try runHook(a, io, &env, "pre-apply");281    defer a.free(missing.output);282    try std.testing.expectEqual(HookResult.not_found, missing.result);283284    try hook_dir.setFilePermissions(io, "pre-apply", .fromMode(0o755), .{});285286    const failed = try runHook(a, io, &env, "pre-apply");287    defer a.free(failed.output);288    try std.testing.expectEqual(HookResult.failed, failed.result);289    try std.testing.expectEqual(@as(u8, 3), failed.exit_code);290    try std.testing.expect(std.mem.indexOf(u8, failed.output, "hook says no") != null);291    try std.testing.expect(std.mem.indexOf(u8, failed.output, "detail") != null);292}293294fn buildArgv(gpa: std.mem.Allocator, machine: *const types.Machine, cmd: []const []const u8) ![]const []const u8 {295    if (machine.local) return cmd;296297    const host = machine.host orelse {298        errors.error_info.setMessage("machine '{s}' has no host configured", .{machine.name});299        return error.SshFailed;300    };301302    var ssh: std.ArrayList([]const u8) = .empty;303    try ssh.append(gpa, "ssh");304    try ssh.append(gpa, "-o");305    try ssh.append(gpa, "BatchMode=yes");306    try ssh.append(gpa, "-o");307    try ssh.append(gpa, "StrictHostKeyChecking=accept-new");308    if (machine.ssh_key) |key| {309        try ssh.append(gpa, "-i");310        try ssh.append(gpa, key);311    }312    const addr = if (machine.user) |u|313        try std.fmt.allocPrint(gpa, "{s}@{s}", .{ u, host })314    else315        try gpa.dupe(u8, host);316    try ssh.append(gpa, addr);317    for (cmd) |arg| try ssh.append(gpa, arg);318    return ssh.toOwnedSlice(gpa);319}320321// --- NixOS rebuild ---322323// True if the machine's config dir holds a flake.nix. Only meaningful for a local324// machine — the file lives on the local filesystem. Remote flake detection would325// need an ssh round-trip; a remote flake at the default /etc/nixos needs no flag326// anyway, so we don't bother.327// True if `dir` contains a flake.nix (local filesystem check).328pub fn dirHasFlake(gpa: std.mem.Allocator, io: std.Io, dir: []const u8) bool {329    const flake_path = std.fs.path.join(gpa, &.{ dir, "flake.nix" }) catch return false;330    defer gpa.free(flake_path);331    return pathExists(io, flake_path);332}333334pub fn configHasFlake(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) bool {335    if (!machine.local) return false;336    return dirHasFlake(gpa, io, machine.config_path);337}338339// nixos-rebuild auto-detects /etc/nixos/flake.nix, so the --flake flag is only340// needed when the flake lives elsewhere. A flake at a non-default path must be341// passed explicitly or nixos-rebuild falls back to channels. Compare with342// trailing slashes trimmed so "/etc/nixos/" is still treated as the default.343fn useFlakeFlag(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) bool {344    if (!configHasFlake(gpa, io, machine)) return false;345    var path = machine.config_path;346    while (path.len > 1 and path[path.len - 1] == '/') path = path[0 .. path.len - 1];347    return !std.mem.eql(u8, path, "/etc/nixos");348}349350// Capture nixos-rebuild stderr for the translation pipeline. Raw nix build351// output is suppressed; on failure, reportError() translates stderr via352// errors.translateError(). The substep line above the call tells the user what353// is running; silence during the build is intentional per the error-wrapping brief.354fn nixosRebuildRun(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, verb: []const u8, flake: bool) !u8 {355    const argv: []const []const u8 = if (flake)356        &.{ "sudo", "nixos-rebuild", verb, "--flake", machine.config_path }357    else358        &.{ "sudo", "nixos-rebuild", verb };359    output.flush();360    const r = try capture(gpa, io, machine, argv);361    defer gpa.free(r.stdout);362    defer gpa.free(r.stderr);363    errors.setBuildStderr(r.stderr);364    return r.exit_code;365}366367pub fn nixosRebuildSwitch(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {368    const flake = useFlakeFlag(gpa, io, machine);369    if (flake) {370        output.printSubstep("nixos-rebuild switch --flake {s}", .{machine.config_path});371    } else {372        output.printSubstep("nixos-rebuild switch", .{});373    }374    return nixosRebuildRun(io, machine, gpa, "switch", flake);375}376377// Live-streaming variant used by `apply` when stdout is a TTY. Each stderr line378// from nixos-rebuild is fed to the build panel for real-time progress display379// while the full stderr is also accumulated for the error translation pipeline.380// Falls back to the silent capture path when not a TTY.381pub fn nixosRebuildSwitchWithPanel(382    io: std.Io,383    machine: *const types.Machine,384    gpa: std.mem.Allocator,385    panel: *output.BuildPanel,386) !u8 {387    const flake = useFlakeFlag(gpa, io, machine);388    if (flake) {389        output.printSubstep("nixos-rebuild switch --flake {s}", .{machine.config_path});390    } else {391        output.printSubstep("nixos-rebuild switch", .{});392    }393    if (!output.colorEnabled()) return nixosRebuildRun(io, machine, gpa, "switch", flake);394    return nixosRebuildRunStreamed(io, machine, gpa, "switch", flake, panel);395}396397fn nixosRebuildRunStreamed(398    io: std.Io,399    machine: *const types.Machine,400    gpa: std.mem.Allocator,401    verb: []const u8,402    flake: bool,403    panel: *output.BuildPanel,404) !u8 {405    const argv: []const []const u8 = if (flake)406        &.{ "sudo", "nixos-rebuild", verb, "--flake", machine.config_path }407    else408        &.{ "sudo", "nixos-rebuild", verb };409410    output.flush();411    const built_argv = try buildArgv(gpa, machine, argv);412    defer if (!machine.local) gpa.free(built_argv);413414    var child = std.process.spawn(io, .{415        .argv = built_argv,416        .stdin = .ignore,417        .stdout = .ignore,418        .stderr = .pipe,419    }) catch |e| {420        errors.error_info.setMessage("failed to spawn nixos-rebuild", .{});421        return e;422    };423424    var accumulated: std.ArrayList(u8) = .empty;425    defer accumulated.deinit(gpa);426427    if (child.stderr) |stderr_file| {428        var reader_buf: [8192]u8 = undefined;429        var fr = std.Io.File.Reader.initStreaming(stderr_file, io, &reader_buf);430        while (true) {431            const maybe = fr.interface.takeDelimiter('\n') catch break;432            const raw = maybe orelse break;433            accumulated.appendSlice(gpa, raw) catch {};434            const line = std.mem.trimEnd(u8, raw, "\r\n");435            panel.update(line);436            panel.render();437        }438    }439440    errors.setBuildStderr(accumulated.items);441442    const term = child.wait(io) catch |e| {443        errors.error_info.setMessage("nixos-rebuild wait failed", .{});444        return e;445    };446    return switch (term) {447        .exited => |code| code,448        else => 1,449    };450}451452pub fn nixosRebuildDryActivate(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {453    return nixosRebuildRun(io, machine, gpa, "dry-activate", useFlakeFlag(gpa, io, machine));454}455456pub fn nixosRebuildBuild(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {457    return nixosRebuildRun(io, machine, gpa, "build", useFlakeFlag(gpa, io, machine));458}459460// --- Generations ---461462// Read system-profile generations WITHOUT root. `nix-env --list-generations -p463// /nix/var/nix/profiles/system` takes a profile lock and fails as a normal user464// ("system.lock: Permission denied"). The generation symlinks themselves are465// world-readable, so list them directly: parse `system-N-link` names, take each466// link's own mtime for the date/time, and mark the one the `system` symlink467// points at as current. Output matches the `nix-env --list-generations` columns468// (num date time [current]) so parseGenerations is unchanged.469const GEN_LIST_SCRIPT =470    \\cur=$(readlink /nix/var/nix/profiles/system 2>/dev/null | sed 's/.*system-\([0-9]*\)-link/\1/'); find /nix/var/nix/profiles -maxdepth 1 -name 'system-*-link' -printf '%f %TY-%Tm-%Td %TH:%TM\n' 2>/dev/null | sed 's/system-\([0-9]*\)-link/\1/' | sort -n | awk -v c="$cur" '{ if ($1==c) print $0" current"; else print $0 }'471;472473pub fn getGenerations(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]types.GenerationInfo {474    const r = try capture(gpa, io, machine, &.{ "sh", "-c", GEN_LIST_SCRIPT });475    defer gpa.free(r.stderr);476    defer gpa.free(r.stdout);477    if (r.exit_code != 0) return error.ProcessFailed;478    return parseGenerations(gpa, r.stdout);479}480481fn parseGenerations(gpa: std.mem.Allocator, output_str: []const u8) ![]types.GenerationInfo {482    var gens: std.ArrayList(types.GenerationInfo) = .empty;483    var lines = std.mem.splitScalar(u8, output_str, '\n');484    while (lines.next()) |line| {485        const trimmed = std.mem.trim(u8, line, " \t");486        if (trimmed.len == 0) continue;487        var parts = std.mem.tokenizeAny(u8, trimmed, " \t");488        const num_str = parts.next() orelse continue;489        const date_str = parts.next() orelse continue;490        const time_str = parts.next() orelse continue;491        const rest = parts.rest();492        const current = std.mem.indexOf(u8, rest, "current") != null;493        const num = std.fmt.parseInt(u32, num_str, 10) catch continue;494        try gens.append(gpa, .{495            .number = num,496            .date = try gpa.dupe(u8, date_str),497            .time = try gpa.dupe(u8, time_str),498            .current = current,499        });500    }501    return gens.toOwnedSlice(gpa);502}503504pub fn getCurrentGeneration(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) !u32 {505    const gens = try getGenerations(gpa, io, machine);506    defer gpa.free(gens);507    for (gens) |g| {508        if (g.current) return g.number;509    }510    return 0;511}512513pub fn switchGeneration(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, n: u32) !u8 {514    // Switch the system profile to generation n, then activate it (bootloader +515    // services). Without switch-to-configuration the change isn't applied.516    const cmd = try std.fmt.allocPrint(gpa, "nix-env -p {s} --switch-generation {d} && {s}/bin/switch-to-configuration switch", .{ SYSTEM_PROFILE, n, SYSTEM_PROFILE });517    defer gpa.free(cmd);518    return stream(io, machine, gpa, &.{ "sudo", "sh", "-c", cmd });519}520521pub fn rollback(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {522    return stream(io, machine, gpa, &.{ "sudo", "nixos-rebuild", "switch", "--rollback" });523}524525pub fn deleteGeneration(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, n: u32) !u8 {526    const n_str = try std.fmt.allocPrint(gpa, "{d}", .{n});527    defer gpa.free(n_str);528    return stream(io, machine, gpa, &.{ "sudo", "nix-env", "-p", SYSTEM_PROFILE, "--delete-generations", n_str });529}530531pub fn deleteOldGenerations(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {532    return stream(io, machine, gpa, &.{ "sudo", "nix-env", "-p", SYSTEM_PROFILE, "--delete-generations", "old" });533}534535// --- Garbage collection ---536537pub fn collectGarbage(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, delete_old: bool, keep: u32) !u8 {538    if (delete_old) {539        return stream(io, machine, gpa, &.{ "sudo", "nix-collect-garbage", "-d" });540    }541    // Keep the `keep` most recent system generations (+N deletes all but N),542    // then collect now-unreferenced store paths. `--delete-older-than` wants a543    // duration (e.g. 14d), not a generation count.544    const cmd = try std.fmt.allocPrint(gpa, "nix-env -p {s} --delete-generations +{d} && nix-collect-garbage", .{ SYSTEM_PROFILE, keep });545    defer gpa.free(cmd);546    return stream(io, machine, gpa, &.{ "sudo", "sh", "-c", cmd });547}548549// --- Channels ---550551pub fn channelList(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]types.ChannelInfo {552    const r = try capture(gpa, io, machine, &.{ "nix-channel", "--list" });553    defer gpa.free(r.stderr);554    defer gpa.free(r.stdout);555    if (r.exit_code != 0) return error.ProcessFailed;556    return parseChannels(gpa, r.stdout);557}558559fn parseChannels(gpa: std.mem.Allocator, output_str: []const u8) ![]types.ChannelInfo {560    var channels: std.ArrayList(types.ChannelInfo) = .empty;561    var lines = std.mem.splitScalar(u8, output_str, '\n');562    while (lines.next()) |line| {563        const trimmed = std.mem.trim(u8, line, " \t\r");564        if (trimmed.len == 0) continue;565        const space = std.mem.indexOfScalar(u8, trimmed, ' ') orelse continue;566        try channels.append(gpa, .{567            .name = try gpa.dupe(u8, trimmed[0..space]),568            .url = try gpa.dupe(u8, std.mem.trim(u8, trimmed[space + 1 ..], " \t")),569        });570    }571    return channels.toOwnedSlice(gpa);572}573574pub fn channelUpdate(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {575    return stream(io, machine, gpa, &.{ "sudo", "nix-channel", "--update" });576}577578pub fn channelAdd(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, url: []const u8, name: []const u8) !u8 {579    return stream(io, machine, gpa, &.{ "sudo", "nix-channel", "--add", url, name });580}581582pub fn channelRemove(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, name: []const u8) !u8 {583    return stream(io, machine, gpa, &.{ "sudo", "nix-channel", "--remove", name });584}585586// --- Services ---587588pub fn serviceList(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, user: bool) ![]types.ServiceInfo {589    const cmd: []const []const u8 = if (user)590        &.{ "systemctl", "--user", "list-units", "--type=service", "--no-legend", "--no-pager" }591    else592        &.{ "systemctl", "list-units", "--type=service", "--no-legend", "--no-pager" };593    const r = try capture(gpa, io, machine, cmd);594    defer gpa.free(r.stderr);595    defer gpa.free(r.stdout);596    if (r.exit_code != 0) return error.ProcessFailed;597    return parseServices(gpa, r.stdout);598}599600fn parseServices(gpa: std.mem.Allocator, output_str: []const u8) ![]types.ServiceInfo {601    var svcs: std.ArrayList(types.ServiceInfo) = .empty;602    var lines = std.mem.splitScalar(u8, output_str, '\n');603    while (lines.next()) |line| {604        const trimmed = std.mem.trim(u8, line, " \t\r");605        if (trimmed.len == 0 or trimmed[0] == 0xE2) continue; // skip UTF-8 bullet lines606        var parts = std.mem.tokenizeAny(u8, trimmed, " \t");607        const name = parts.next() orelse continue;608        _ = parts.next(); // load609        const active_str = parts.next() orelse continue;610        const sub_str = parts.next() orelse "unknown";611612        const state: types.ServiceState = if (std.mem.eql(u8, active_str, "active"))613            (if (std.mem.eql(u8, sub_str, "running") or std.mem.eql(u8, sub_str, "exited")) .active else .active)614        else if (std.mem.eql(u8, active_str, "failed"))615            .failed616        else617            .inactive;618619        try svcs.append(gpa, .{620            .name = try gpa.dupe(u8, name),621            .state = state,622            .uptime = null,623        });624    }625    return svcs.toOwnedSlice(gpa);626}627628pub fn serviceCtl(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, verb: []const u8, name: []const u8, user: bool) !u8 {629    // --no-pager: `systemctl status` pipes to a pager on a tty and would block.630    // User services run under the caller's own systemd manager, so no sudo.631    if (user) {632        return stream(io, machine, gpa, &.{ "systemctl", "--user", "--no-pager", verb, name });633    }634    return stream(io, machine, gpa, &.{ "sudo", "systemctl", "--no-pager", verb, name });635}636637pub fn serviceLogs(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, name: []const u8, last: u32, follow: bool, user: bool) !u8 {638    const n_str = try std.fmt.allocPrint(gpa, "{d}", .{last});639    defer gpa.free(n_str);640    if (user) {641        if (follow) return stream(io, machine, gpa, &.{ "journalctl", "--user", "-u", name, "-f" });642        return stream(io, machine, gpa, &.{ "journalctl", "--user", "-u", name, "-n", n_str, "--no-pager" });643    }644    if (follow) {645        return stream(io, machine, gpa, &.{ "journalctl", "-u", name, "-f" });646    }647    return stream(io, machine, gpa, &.{ "journalctl", "-u", name, "-n", n_str, "--no-pager" });648}649650// --- Profile ---651652pub fn profileInstall(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, attr: []const u8) !u8 {653    const pkg_ref = try std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{attr});654    defer gpa.free(pkg_ref);655    // `nix profile add` is the current verb; `install` is a deprecated alias that656    // prints a warning on modern nix.657    return stream(io, machine, gpa, &.{ "nix", "profile", "add", pkg_ref });658}659660pub fn profileRemove(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, attr: []const u8) !u8 {661    // `nix profile remove` matches by profile element name (e.g. "ripgrep"), not662    // by flake ref — passing nixpkgs#ripgrep matches nothing.663    return stream(io, machine, gpa, &.{ "nix", "profile", "remove", attr });664}665666pub fn profileList(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {667    const r = try capture(gpa, io, machine, &.{ "nix", "profile", "list" });668    defer gpa.free(r.stderr);669    if (r.exit_code != 0) return error.ProcessFailed;670    return r.stdout;671}672673// Machine-readable profile listing — caller parses elements -> name + version.674pub fn profileListJson(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {675    const r = try capture(gpa, io, machine, &.{ "nix", "profile", "list", "--json" });676    defer gpa.free(r.stderr);677    if (r.exit_code != 0) {678        gpa.free(r.stdout);679        return error.ProcessFailed;680    }681    return r.stdout;682}683684// Returns the profile element name to pass to `nix profile remove/upgrade`685// (e.g. "nina" or "default"), or null if nina is not found. Caller owns the686// returned slice. A NixOS system-package install also resolves into /nix/store687// so the store path alone can't distinguish it from a profile install — the688// profile list can. A missing/empty profile (or no nix) returns null.689pub fn profileNinaElement(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ?[]const u8 {690    const js = profileListJson(gpa, io, machine) catch return null;691    defer gpa.free(js);692    return profileJsonNinaElement(gpa, js);693}694695// Element name + install URL for the nina profile entry. Used by `nina update`696// to upgrade via `nix profile upgrade <originalUrl>` rather than passing the697// element name — newer nix (2.18+) interprets bare names as registry installables,698// which silently no-ops for tarball installs. Caller owns both slices.699pub const NinaProfileInfo = struct {700    name: []const u8,701    original_url: ?[]const u8,702};703704pub fn profileNinaInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ?NinaProfileInfo {705    const js = profileListJson(gpa, io, machine) catch return null;706    defer gpa.free(js);707    return profileJsonNinaInfo(gpa, js);708}709710fn profileJsonNinaInfo(gpa: std.mem.Allocator, js: []const u8) ?NinaProfileInfo {711    var parsed = std.json.parseFromSlice(std.json.Value, gpa, js, .{}) catch return null;712    defer parsed.deinit();713    const root = parsed.value;714    if (root != .object) return null;715    const elements = root.object.get("elements") orelse return null;716    switch (elements) {717        .object => |obj| {718            // Fast path: "nina" key present (nix 2.18+ with nixpkgs#nina or tarball install).719            if (obj.contains("nina")) {720                const name = gpa.dupe(u8, "nina") catch return null;721                const url = urlFromObjEntry(gpa, obj.get("nina"));722                return .{ .name = name, .original_url = url };723            }724            // Fallback: scan storePaths for any element whose store path is nina.725            var it = obj.iterator();726            while (it.next()) |kv| {727                const val = kv.value_ptr.*;728                if (val != .object) continue;729                const sps = val.object.get("storePaths") orelse continue;730                if (sps != .array) continue;731                for (sps.array.items) |sp| {732                    if (sp == .string and storePathIsNina(sp.string)) {733                        const name = gpa.dupe(u8, kv.key_ptr.*) catch return null;734                        const url = urlFromObjEntry(gpa, val);735                        return .{ .name = name, .original_url = url };736                    }737                }738            }739            return null;740        },741        .array => |arr| {742            for (arr.items) |el| {743                if (el != .object) continue;744                const ap = el.object.get("attrPath") orelse continue;745                if (ap != .string) continue;746                const is_nina_attr = std.mem.eql(u8, ap.string, "nina") or747                    std.mem.endsWith(u8, ap.string, ".nina");748                if (!is_nina_attr) {749                    const sps = el.object.get("storePaths") orelse continue;750                    if (sps != .array) continue;751                    var found = false;752                    for (sps.array.items) |sp| {753                        if (sp == .string and storePathIsNina(sp.string)) {754                            found = true;755                            break;756                        }757                    }758                    if (!found) continue;759                }760                const dot = std.mem.lastIndexOf(u8, ap.string, ".") orelse 0;761                const el_name = if (!is_nina_attr and dot > 0) ap.string[dot + 1 ..] else "nina";762                const name = gpa.dupe(u8, el_name) catch return null;763                const url = urlFromObjEntry(gpa, el);764                return .{ .name = name, .original_url = url };765            }766            return null;767        },768        else => return null,769    }770}771772fn urlFromObjEntry(gpa: std.mem.Allocator, val: ?std.json.Value) ?[]const u8 {773    const v = val orelse return null;774    if (v != .object) return null;775    const u = v.object.get("originalUrl") orelse return null;776    if (u != .string) return null;777    return gpa.dupe(u8, u.string) catch null;778}779780pub fn profileHasNina(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) bool {781    const name = profileNinaElement(gpa, io, machine) orelse return false;782    gpa.free(name);783    return true;784}785786// True when a nix store path belongs to the nina package. Store paths have the787// form /nix/store/<32-char-hash>-<pname>-<version>[/<subpath>]. We check that788// the 33 chars after /nix/store/ are the hash+dash, and the pname that follows789// is exactly "nina" (followed by "-" or end-of-component).790fn storePathIsNina(path: []const u8) bool {791    const prefix = "/nix/store/";792    if (!std.mem.startsWith(u8, path, prefix)) return false;793    const rel = path[prefix.len..];794    // The store entry name ends at the first "/" (if any sub-path follows).795    const entry = rel[0 .. std.mem.indexOf(u8, rel, "/") orelse rel.len];796    if (entry.len < 34) return false; // 32-char hash + dash + at least one char797    const pname_ver = entry[33..]; // skip hash + dash798    return std.mem.startsWith(u8, pname_ver, "nina-") or std.mem.eql(u8, pname_ver, "nina");799}800801// Pure parse of `nix profile list --json` for a nina element, returning its802// element name (the key to pass to `nix profile remove/upgrade`) or null.803// Newer nix (2.18+) keys elements by pname ("nina"). Older nix uses an array804// with an "attrPath" field. Tarball installs via the `default` output may use805// the key "default" instead of "nina"; we detect those via storePaths.806fn profileJsonNinaElement(gpa: std.mem.Allocator, js: []const u8) ?[]const u8 {807    var parsed = std.json.parseFromSlice(std.json.Value, gpa, js, .{}) catch return null;808    defer parsed.deinit();809    const root = parsed.value;810    if (root != .object) return null;811    const elements = root.object.get("elements") orelse return null;812    switch (elements) {813        .object => |obj| {814            // Fast path: exact "nina" key (nix 2.18+ with nixpkgs#nina install).815            if (obj.contains("nina")) return gpa.dupe(u8, "nina") catch null;816            // Fallback: scan storePaths. Handles tarball installs where the default817            // output is selected and nix names the element "default" (older nix) or818            // some other key derived from the attrPath rather than the pname.819            var it = obj.iterator();820            while (it.next()) |kv| {821                const val = kv.value_ptr.*;822                if (val != .object) continue;823                const sps = val.object.get("storePaths") orelse continue;824                if (sps != .array) continue;825                for (sps.array.items) |sp| {826                    if (sp == .string and storePathIsNina(sp.string))827                        return gpa.dupe(u8, kv.key_ptr.*) catch null;828                }829            }830            return null;831        },832        .array => |arr| {833            // Older nix array format. Element name is the last component of attrPath.834            for (arr.items) |el| {835                if (el != .object) continue;836                const ap = el.object.get("attrPath") orelse continue;837                if (ap != .string) continue;838                if (std.mem.eql(u8, ap.string, "nina") or839                    std.mem.endsWith(u8, ap.string, ".nina"))840                    return gpa.dupe(u8, "nina") catch null;841                // Tarball default-output install: attrPath ends in ".default" but842                // storePaths point to nina. Return "default" as the element name.843                const sps = el.object.get("storePaths") orelse continue;844                if (sps != .array) continue;845                for (sps.array.items) |sp| {846                    if (sp != .string) continue;847                    if (!storePathIsNina(sp.string)) continue;848                    const dot = std.mem.lastIndexOf(u8, ap.string, ".") orelse 0;849                    const el_name = if (dot > 0) ap.string[dot + 1 ..] else ap.string;850                    return gpa.dupe(u8, el_name) catch null;851                }852            }853            return null;854        },855        else => return null,856    }857}858859test "profileJsonNinaElement finds element name from profile JSON" {860    const a = std.testing.allocator;861862    // Newer nix: elements keyed by pname. "nina" key present.863    const named =864        \\{"elements":{"bat":{"storePaths":["/nix/store/h0000000000000000000000000000000-bat-0.26.1"]},865        \\"nina":{"attrPath":"packages.x86_64-linux.nina","storePaths":["/nix/store/a0000000000000000000000000000000-nina-3.0.15"]}},"version":3}866    ;867    const r1 = profileJsonNinaElement(a, named);868    defer if (r1) |n| a.free(n);869    try std.testing.expectEqualStrings("nina", r1.?);870871    // Tarball install via default output: element keyed as "default", storePath is nina.872    const default_key =873        \\{"elements":{"default":{"attrPath":"packages.x86_64-linux.default","storePaths":["/nix/store/w0000000000000000000000000000000-nina-3.0.16"]}},"version":3}874    ;875    const r2 = profileJsonNinaElement(a, default_key);876    defer if (r2) |n| a.free(n);877    try std.testing.expectEqualStrings("default", r2.?);878879    // Decoy: storePath of another package contains "nina" as a substring but is not nina.880    const decoy =881        \\{"elements":{"luminance":{"storePaths":["/nix/store/x0000000000000000000000000000000-luminance-nina-1.0"]}},"version":3}882    ;883    const r3 = profileJsonNinaElement(a, decoy);884    try std.testing.expectEqual(@as(?[]const u8, null), r3);885886    // Older nix array schema, attrPath ending in ".nina".887    const arr =888        \\{"elements":[{"attrPath":"legacyPackages.x86_64-linux.nina","storePaths":["/nix/store/a0000000000000000000000000000000-nina-3.0.15"]}],"version":2}889    ;890    const r4 = profileJsonNinaElement(a, arr);891    defer if (r4) |n| a.free(n);892    try std.testing.expectEqualStrings("nina", r4.?);893894    // Older nix array schema, tarball default-output install.895    const arr_default =896        \\{"elements":[{"attrPath":"packages.x86_64-linux.default","storePaths":["/nix/store/w0000000000000000000000000000000-nina-3.0.16"]}],"version":2}897    ;898    const r5 = profileJsonNinaElement(a, arr_default);899    defer if (r5) |n| a.free(n);900    try std.testing.expectEqualStrings("default", r5.?);901902    // Empty / malformed → null.903    try std.testing.expectEqual(@as(?[]const u8, null), profileJsonNinaElement(a, "{\"elements\":{},\"version\":3}"));904    try std.testing.expectEqual(@as(?[]const u8, null), profileJsonNinaElement(a, "not json"));905}906907// The store paths that make up the running system environment. Each reference is908// a <hash>-<name>-<version> path, so the caller can list system packages with909// versions — there is no cleaner per-package list for environment.systemPackages.910pub fn systemPackagePaths(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {911    const r = try capture(gpa, io, machine, &.{ "nix-store", "-q", "--references", "/run/current-system/sw" });912    defer gpa.free(r.stderr);913    if (r.exit_code != 0) {914        gpa.free(r.stdout);915        return error.ProcessFailed;916    }917    return r.stdout;918}919920pub fn profileUpgrade(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {921    return stream(io, machine, gpa, &.{ "nix", "profile", "upgrade", ".*" });922}923924// --- Store ---925926pub fn storeGc(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {927    return stream(io, machine, gpa, &.{ "sudo", "nix-collect-garbage" });928}929930pub fn storeVerify(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {931    return stream(io, machine, gpa, &.{ "nix", "store", "verify", "--all" });932}933934// Deduplicate identical store files via hard links — frees space without935// garbage-collecting any paths.936pub fn storeOptimise(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {937    return stream(io, machine, gpa, &.{ "nix", "store", "optimise" });938}939940pub const SystemStatus = struct { size: []u8, age: []u8 };941942// One read-only pass for `nina status`: the current system's closure size (a943// single `path-info -S` of /run/current-system — fast, unlike -S over the whole944// store) and seconds since the system profile was last switched (its symlink945// mtime). Both are world-readable; no root needed.946const STATUS_SCRIPT =947    \\sz=$(nix path-info -S /run/current-system 2>/dev/null | awk '{print $NF}'); mt=$(stat -c %Y /nix/var/nix/profiles/system 2>/dev/null); now=$(date +%s); echo "${sz:-0} $(( ${now:-0} - ${mt:-0} ))"948;949950pub fn systemStatus(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) SystemStatus {951    const unknown = SystemStatus{952        .size = gpa.dupe(u8, "") catch return .{ .size = "", .age = "" },953        .age = gpa.dupe(u8, "") catch return .{ .size = "", .age = "" },954    };955    const r = capture(gpa, io, machine, &.{ "sh", "-c", STATUS_SCRIPT }) catch return unknown;956    defer gpa.free(r.stdout);957    defer gpa.free(r.stderr);958    if (r.exit_code != 0) return unknown;959960    var it = std.mem.tokenizeAny(u8, r.stdout, " \t\n\r");961    const sz_str = it.next() orelse return unknown;962    const age_str = it.next() orelse return unknown;963    const bytes = std.fmt.parseInt(u64, sz_str, 10) catch 0;964    const age_secs = std.fmt.parseInt(u64, age_str, 10) catch 0;965966    gpa.free(unknown.size);967    gpa.free(unknown.age);968    return .{969        .size = humanSize(gpa, bytes) catch (gpa.dupe(u8, "") catch ""),970        .age = humanAgo(gpa, age_secs) catch (gpa.dupe(u8, "") catch ""),971    };972}973974// `systemctl is-system-running` -> "running" / "degraded" / "starting" ... A975// one-word health signal; exits non-zero when degraded, so we read stdout, not976// the code. Caller owns the returned slice.977pub fn systemRunningState(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {978    const r = capture(gpa, io, machine, &.{ "systemctl", "is-system-running" }) catch979        return gpa.dupe(u8, "unknown");980    defer gpa.free(r.stderr);981    const state = std.mem.trim(u8, r.stdout, " \t\n\r");982    const owned = try gpa.dupe(u8, if (state.len > 0) state else "unknown");983    gpa.free(r.stdout);984    return owned;985}986987fn humanAgo(gpa: std.mem.Allocator, secs: u64) ![]u8 {988    if (secs < 60) return std.fmt.allocPrint(gpa, "{d}s ago", .{secs});989    if (secs < 3600) return std.fmt.allocPrint(gpa, "{d}m ago", .{secs / 60});990    if (secs < 86400) return std.fmt.allocPrint(gpa, "{d}h ago", .{secs / 3600});991    return std.fmt.allocPrint(gpa, "{d}d ago", .{secs / 86400});992}993994pub fn storeRepair(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {995    return stream(io, machine, gpa, &.{ "sudo", "nix", "store", "repair", "--all" });996}997998pub fn storeInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) !types.StoreInfo {999    // `nix path-info -S --all` computes the CLOSURE size of every path — O(paths^2)1000    // graph work that takes minutes on a real store (59k+ paths) and hangs the1001    // command. We don't need closures: `--all --json` (no -S) carries each path's1002    // own narSize, so one fast pass gives the path count and the summed store size.1003    // `du -sh /nix/store` is just as slow on a big store, so it's gone too.1004    // timeout-wrapped so a pathological store degrades to "?" instead of hanging.1005    const pi = try capture(gpa, io, machine, &.{ "sh", "-c", "timeout 90 nix path-info --all --json 2>/dev/null" });1006    defer gpa.free(pi.stdout);1007    defer gpa.free(pi.stderr);10081009    const scan = scanStoreJson(pi.stdout);1010    const total_owned = try humanSize(gpa, scan.total_bytes);10111012    return .{1013        .total_size = total_owned,1014        .live_paths = scan.count,1015        .reclaimable_paths = 0,1016    };1017}10181019const StoreScan = struct { count: u64, total_bytes: u64 };10201021// One linear pass over `nix path-info --json`: each path object has exactly one1022// "narSize": field, so counting them gives the true path count and summing the1023// values gives the total store size — no per-path closure walk.1024fn scanStoreJson(json_str: []const u8) StoreScan {1025    const needle = "\"narSize\":";1026    var count: u64 = 0;1027    var total: u64 = 0;1028    var i: usize = 0;1029    while (std.mem.indexOfPos(u8, json_str, i, needle)) |pos| {1030        var j = pos + needle.len;1031        while (j < json_str.len and json_str[j] == ' ') : (j += 1) {}1032        var val: u64 = 0;1033        var any = false;1034        while (j < json_str.len and json_str[j] >= '0' and json_str[j] <= '9') : (j += 1) {1035            val = val * 10 + (json_str[j] - '0');1036            any = true;1037        }1038        if (any) {1039            count += 1;1040            total += val;1041        }1042        i = j;1043    }1044    return .{ .count = count, .total_bytes = total };1045}10461047fn humanSize(gpa: std.mem.Allocator, bytes: u64) ![]u8 {1048    const units = [_][]const u8{ "B", "KB", "MB", "GB", "TB" };1049    var val: f64 = @floatFromInt(bytes);1050    var unit: usize = 0;1051    while (val >= 1024.0 and unit + 1 < units.len) : (unit += 1) val /= 1024.0;1052    if (unit == 0) return std.fmt.allocPrint(gpa, "{d} {s}", .{ bytes, units[0] });1053    return std.fmt.allocPrint(gpa, "{d:.1} {s}", .{ val, units[unit] });1054}10551056pub fn storePath(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, attr: []const u8) ![]u8 {1057    // nixpkgs#<attr>, not .#<attr>: the package lives in nixpkgs (resolved via the1058    // flake registry), not a flake in the current directory.1059    const expr = try std.fmt.allocPrint(gpa, "nixpkgs#{s}.outPath", .{attr});1060    defer gpa.free(expr);1061    const r = try capture(gpa, io, machine, &.{ "nix", "eval", "--raw", expr });1062    defer gpa.free(r.stderr);1063    if (r.exit_code != 0) {1064        gpa.free(r.stdout);1065        return error.ProcessFailed;1066    }1067    return r.stdout;1068}10691070// --- Flake ---10711072pub fn flakeUpdate(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, input: ?[]const u8) !u8 {1073    if (input) |inp| {1074        return stream(io, machine, gpa, &.{ "nix", "flake", "update", inp });1075    }1076    return stream(io, machine, gpa, &.{ "nix", "flake", "update" });1077}10781079// Update flake inputs for the flake living in `dir` (the config dir). `nix flake1080// update` operates on the flake in the working directory, so we cd there first.1081// Used by `nina upgrade` on a flake system in place of nix-channel --update.1082pub fn flakeUpdateAt(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, dir: []const u8) !u8 {1083    return stream(io, machine, gpa, &.{ "sh", "-c", "cd \"$0\" && nix flake update", dir });1084}10851086pub fn flakeCheck(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1087    return stream(io, machine, gpa, &.{ "nix", "flake", "check" });1088}10891090pub fn flakeInit(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1091    return stream(io, machine, gpa, &.{ "nix", "flake", "init" });1092}10931094pub fn flakeLock(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1095    return stream(io, machine, gpa, &.{ "nix", "flake", "lock" });1096}10971098pub fn flakeClone(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, url: []const u8) !u8 {1099    return stream(io, machine, gpa, &.{ "nix", "flake", "clone", url });1100}11011102pub fn flakeShow(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1103    const r = try capture(gpa, io, machine, &.{ "nix", "flake", "show", "--json" });1104    defer gpa.free(r.stderr);1105    if (r.exit_code != 0) {1106        gpa.free(r.stdout);1107        return error.ProcessFailed;1108    }1109    return r.stdout;1110}11111112// --- Build / Run / Develop ---11131114pub fn nixBuild(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, attr: ?[]const u8) !u8 {1115    if (attr) |a| {1116        const ref = try std.fmt.allocPrint(gpa, ".#{s}", .{a});1117        defer gpa.free(ref);1118        return stream(io, machine, gpa, &.{ "nix", "build", ref });1119    }1120    return stream(io, machine, gpa, &.{ "nix", "build" });1121}11221123pub fn nixRun(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1124    // nix run always gets --no-write-lock-file for remote URLs1125    const is_url = std.mem.startsWith(u8, pkg, "http://") or std.mem.startsWith(u8, pkg, "https://") or std.mem.startsWith(u8, pkg, "github:");1126    if (is_url) {1127        return stream(io, machine, gpa, &.{ "nix", "run", pkg, "--no-write-lock-file" });1128    }1129    // Already a flake ref (contains '#') → use as-is; bare name → default to nixpkgs#.1130    if (std.mem.indexOfScalar(u8, pkg, '#') != null) {1131        return stream(io, machine, gpa, &.{ "nix", "run", pkg });1132    }1133    const ref = try std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{pkg});1134    defer gpa.free(ref);1135    return stream(io, machine, gpa, &.{ "nix", "run", ref });1136}11371138pub fn nixShell(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1139    const ref = try std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{pkg});1140    defer gpa.free(ref);1141    return stream(io, machine, gpa, &.{ "nix", "shell", ref });1142}11431144pub fn nixShellPs1(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8, base_env: *const std.process.Environ.Map) !u8 {1145    const ref = try std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{pkg});1146    defer gpa.free(ref);1147    const ps1 = try std.fmt.allocPrint(gpa, "(nina: {s}) -> ", .{pkg});1148    defer gpa.free(ps1);1149    if (machine.local) {1150        const rc_path = try createInteractiveShellRc(gpa, io);1151        defer {1152            std.Io.Dir.deleteFile(.cwd(), io, rc_path) catch {};1153            gpa.free(rc_path);1154        }1155        return streamEnv(io, machine, gpa, &.{ "nix", "shell", ref, "--command", "bash", "--rcfile", rc_path, "-i" }, base_env, ps1);1156    }1157    return streamEnv(io, machine, gpa, &.{ "nix", "shell", ref }, base_env, ps1);1158}11591160pub fn nixDevelop(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, run_cmd: ?[]const u8) !u8 {1161    if (run_cmd) |cmd| {1162        // sh -c so a multi-word command isn't treated as a single executable name.1163        return stream(io, machine, gpa, &.{ "nix", "develop", "--command", "sh", "-c", cmd });1164    }1165    return stream(io, machine, gpa, &.{ "nix", "develop" });1166}11671168pub fn nixDevelopPs1(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, run_cmd: ?[]const u8, base_env: *const std.process.Environ.Map) !u8 {1169    if (run_cmd) |cmd| {1170        // sh -c so a multi-word command isn't treated as a single executable name.1171        return stream(io, machine, gpa, &.{ "nix", "develop", "--command", "sh", "-c", cmd });1172    }1173    if (machine.local) {1174        const rc_path = try createInteractiveShellRc(gpa, io);1175        defer {1176            std.Io.Dir.deleteFile(.cwd(), io, rc_path) catch {};1177            gpa.free(rc_path);1178        }1179        return streamEnv(io, machine, gpa, &.{ "nix", "develop", "--command", "bash", "--rcfile", rc_path, "-i" }, base_env, "(nina: dev) -> ");1180    }1181    return streamEnv(io, machine, gpa, &.{ "nix", "develop" }, base_env, "(nina: dev) -> ");1182}11831184pub fn nixRepl(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1185    return stream(io, machine, gpa, &.{ "nix", "repl", "--expr", "import <nixpkgs> {}" });1186}11871188// --- Format ---11891190pub fn nixpkgsFmt(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, path: []const u8, check: bool) !u8 {1191    if (check) {1192        return stream(io, machine, gpa, &.{ "nixpkgs-fmt", "--check", path });1193    }1194    return stream(io, machine, gpa, &.{ "nixpkgs-fmt", path });1195}11961197// --- Info ---11981199pub fn systemInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1200    const r = try capture(gpa, io, machine, &.{"nixos-version"});1201    defer gpa.free(r.stderr);1202    if (r.exit_code != 0) {1203        gpa.free(r.stdout);1204        return error.ProcessFailed;1205    }1206    return r.stdout;1207}12081209pub fn kernelInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1210    const r = try capture(gpa, io, machine, &.{ "uname", "-r" });1211    defer gpa.free(r.stderr);1212    if (r.exit_code != 0) {1213        gpa.free(r.stdout);1214        return error.ProcessFailed;1215    }1216    return r.stdout;1217}12181219pub fn uptimeInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1220    const r = try capture(gpa, io, machine, &.{"uptime"});1221    defer gpa.free(r.stderr);1222    if (r.exit_code != 0) {1223        gpa.free(r.stdout);1224        return error.ProcessFailed;1225    }1226    return r.stdout;1227}12281229// --- Boot ---12301231pub fn bootEntries(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]types.BootEntry {1232    const r = try capture(gpa, io, machine, &.{ "bootctl", "list" });1233    defer gpa.free(r.stderr);1234    defer gpa.free(r.stdout);1235    if (r.exit_code != 0) return error.ProcessFailed;1236    return parseBootEntries(gpa, r.stdout);1237}12381239fn parseBootEntries(gpa: std.mem.Allocator, output_str: []const u8) ![]types.BootEntry {1240    var entries: std.ArrayList(types.BootEntry) = .empty;1241    var lines = std.mem.splitScalar(u8, output_str, '\n');1242    while (lines.next()) |line| {1243        const trimmed = std.mem.trim(u8, line, " \t\r");1244        if (std.mem.startsWith(u8, trimmed, "title:")) {1245            const title = std.mem.trim(u8, trimmed[6..], " \t");1246            const current = std.mem.indexOf(u8, title, "(current)") != null;1247            try entries.append(gpa, .{1248                .title = try gpa.dupe(u8, title),1249                .current = current,1250            });1251        }1252    }1253    return entries.toOwnedSlice(gpa);1254}12551256// --- Pkg info ---12571258fn pkgInstallable(gpa: std.mem.Allocator, pkg: []const u8) ![]u8 {1259    return std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{pkg});1260}12611262fn resolvePkgStorePath(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, installable: []const u8) ![]u8 {1263    const r = try capture(gpa, io, machine, &.{ "nix", "build", "--no-link", "--print-out-paths", installable });1264    defer gpa.free(r.stderr);1265    defer gpa.free(r.stdout);1266    if (r.exit_code != 0) return error.PackageNotFound;12671268    var lines = std.mem.tokenizeAny(u8, r.stdout, "\r\n");1269    const first_path = lines.next() orelse return error.PackageNotFound;1270    const store_path = std.mem.trim(u8, first_path, " \t");1271    if (store_path.len == 0) return error.PackageNotFound;1272    return gpa.dupe(u8, store_path);1273}12741275pub fn pkgWhy(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1276    const installable = try pkgInstallable(gpa, pkg);1277    defer gpa.free(installable);1278    const store_path = try resolvePkgStorePath(gpa, io, machine, installable);1279    defer gpa.free(store_path);1280    return stream(io, machine, gpa, &.{ "nix", "why-depends", "/run/current-system", store_path });1281}12821283pub fn pkgDeps(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1284    const installable = try pkgInstallable(gpa, pkg);1285    defer gpa.free(installable);1286    const store_path = try resolvePkgStorePath(gpa, io, machine, installable);1287    defer gpa.free(store_path);1288    return stream(io, machine, gpa, &.{ "nix-store", "--query", "--requisites", store_path });1289}12901291pub fn pkgSize(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, pkg: []const u8) ![]u8 {1292    const installable = try pkgInstallable(gpa, pkg);1293    defer gpa.free(installable);1294    const r = try capture(gpa, io, machine, &.{ "nix", "path-info", "-s", "--json", installable });1295    defer gpa.free(r.stderr);1296    defer gpa.free(r.stdout);1297    if (r.exit_code != 0) return error.ProcessFailed;12981299    const nar_size = try pathInfoNarSize(gpa, r.stdout);1300    return humanPkgSize(gpa, nar_size);1301}13021303pub fn pkgClosure(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1304    const installable = try pkgInstallable(gpa, pkg);1305    defer gpa.free(installable);1306    const store_path = try resolvePkgStorePath(gpa, io, machine, installable);1307    defer gpa.free(store_path);1308    return stream(io, machine, gpa, &.{ "nix", "path-info", "-rS", store_path });1309}13101311fn pathInfoNarSize(gpa: std.mem.Allocator, json_str: []const u8) !u64 {1312    var parsed = std.json.parseFromSlice(std.json.Value, gpa, json_str, .{}) catch return error.ProcessFailed;1313    defer parsed.deinit();1314    switch (parsed.value) {1315        .object => |obj| {1316            var it = obj.iterator();1317            while (it.next()) |entry| {1318                if (entry.value_ptr.* == .object) {1319                    if (entry.value_ptr.object.get("narSize")) |v| {1320                        if (v == .integer and v.integer >= 0) return @intCast(v.integer);1321                    }1322                }1323            }1324        },1325        .array => |arr| {1326            for (arr.items) |item| {1327                if (item == .object) {1328                    if (item.object.get("narSize")) |v| {1329                        if (v == .integer and v.integer >= 0) return @intCast(v.integer);1330                    }1331                }1332            }1333        },1334        else => {},1335    }1336    return error.ProcessFailed;1337}13381339fn humanPkgSize(gpa: std.mem.Allocator, bytes: u64) ![]u8 {1340    const units = [_][]const u8{ "B", "KiB", "MiB", "GiB", "TiB" };1341    var val: f64 = @floatFromInt(bytes);1342    var unit: usize = 0;1343    while (val >= 1024.0 and unit + 1 < units.len) : (unit += 1) val /= 1024.0;1344    if (unit == 0) return std.fmt.allocPrint(gpa, "{d} {s}", .{ bytes, units[0] });1345    return std.fmt.allocPrint(gpa, "{d:.1} {s}", .{ val, units[unit] });1346}13471348test "pathInfoNarSize parses object and array shapes" {1349    try std.testing.expectEqual(@as(u64, 1064629862), try pathInfoNarSize(std.testing.allocator,1350        \\{"/nix/store/abc-ffmpeg":{"narSize":1064629862}}1351    ));1352    try std.testing.expectEqual(@as(u64, 2048), try pathInfoNarSize(std.testing.allocator,1353        \\[{"path":"/nix/store/abc-pkg","narSize":2048}]1354    ));1355}13561357// --- Hash / Fetch ---13581359pub fn nixHash(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, path: []const u8) ![]u8 {1360    const r = try capture(gpa, io, machine, &.{ "nix", "hash", "path", path });1361    defer gpa.free(r.stderr);1362    if (r.exit_code != 0) {1363        gpa.free(r.stdout);1364        return error.ProcessFailed;1365    }1366    return r.stdout;1367}13681369pub fn nixFetch(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, url: []const u8) ![]u8 {1370    const r = try capture(gpa, io, machine, &.{ "nix-prefetch-url", url });1371    defer gpa.free(r.stderr);1372    if (r.exit_code != 0) {1373        gpa.free(r.stdout);1374        return error.ProcessFailed;1375    }1376    return r.stdout;1377}13781379// --- Pin ---13801381pub fn editFlakeLock(_: std.mem.Allocator, _: []const u8, _: []const u8) !void {1382    // Stub: full implementation would parse and edit flake.lock JSON1383    // The pin/unpin flow works via nix flake update which regenerates flake.lock1384}13851386pub fn openEditor(io: std.Io, gpa: std.mem.Allocator, editor: []const u8, path: []const u8, line: ?u32) !u8 {1387    if (line) |l| {1388        const line_arg = try std.fmt.allocPrint(gpa, "+{d}", .{l});1389        defer gpa.free(line_arg);1390        return stream(io, &types.Machine{}, gpa, &.{ editor, path, line_arg });1391    }1392    return stream(io, &types.Machine{}, gpa, &.{ editor, path });1393}13941395// Open a config directory as root with `sudo -E <editor> <path>` — `-E`1396// preserves the user's environment (PATH, TERM, EDITOR config) so the editor1397// behaves the same as it does unprivileged. Used by `nina edit --dir`.1398pub fn openEditorSudo(io: std.Io, gpa: std.mem.Allocator, editor: []const u8, path: []const u8) !u8 {1399    return stream(io, &types.Machine{}, gpa, &.{ "sudo", "-E", editor, path });1400}14011402pub fn diffClosures(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, a: u32, b: u32) !u8 {1403    const a_str = try std.fmt.allocPrint(gpa, "/nix/var/nix/profiles/system-{d}-link", .{a});1404    defer gpa.free(a_str);1405    const b_str = try std.fmt.allocPrint(gpa, "/nix/var/nix/profiles/system-{d}-link", .{b});1406    defer gpa.free(b_str);1407    // On a tty, the child's own color is fine — stream it directly.1408    if (output.colorEnabled()) {1409        return stream(io, machine, gpa, &.{ "nix", "store", "diff-closures", a_str, b_str });1410    }1411    // Piped/redirected: nix store diff-closures colorizes regardless of NO_COLOR,1412    // so we can't ask it to stop — capture its output and strip the ANSI ourselves.1413    const r = try capture(gpa, io, machine, &.{ "nix", "store", "diff-closures", a_str, b_str });1414    defer gpa.free(r.stdout);1415    defer gpa.free(r.stderr);1416    const cleaned = try stripAnsi(gpa, r.stdout);1417    defer gpa.free(cleaned);1418    output.raw(cleaned);1419    return r.exit_code;1420}14211422// Strip CSI escape sequences (ESC '[' ... final-byte) from text. Used to clean a1423// child process's color when it writes ANSI unconditionally.1424fn stripAnsi(gpa: std.mem.Allocator, input: []const u8) ![]u8 {1425    var out: std.ArrayList(u8) = .empty;1426    errdefer out.deinit(gpa);1427    var i: usize = 0;1428    while (i < input.len) {1429        if (input[i] == 0x1b and i + 1 < input.len and input[i + 1] == '[') {1430            i += 2;1431            while (i < input.len and !(input[i] >= 0x40 and input[i] <= 0x7e)) : (i += 1) {}1432            if (i < input.len) i += 1; // consume the final byte1433            continue;1434        }1435        try out.append(gpa, input[i]);1436        i += 1;1437    }1438    return out.toOwnedSlice(gpa);1439}14401441test "stripAnsi removes CSI color sequences" {1442    const cleaned = try stripAnsi(std.testing.allocator, "kepr: \x1b[31;1m13.1 KiB\x1b[0m");1443    defer std.testing.allocator.free(cleaned);1444    try std.testing.expectEqualStrings("kepr: 13.1 KiB", cleaned);1445}14461447// --- Doctor checks ---14481449pub fn runDoctorChecks(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]types.DoctorCheck {1450    var checks: std.ArrayList(types.DoctorCheck) = .empty;14511452    // Check nix daemon1453    {1454        const r = try capture(gpa, io, machine, &.{ "systemctl", "is-active", "nix-daemon" });1455        defer gpa.free(r.stdout);1456        defer gpa.free(r.stderr);1457        const active = std.mem.indexOf(u8, r.stdout, "active") != null;1458        try checks.append(gpa, .{ .name = "nix daemon", .status = if (active) .ok else .fail });1459    }14601461    // Check config syntax. Flake-aware like apply/upgrade: on a flake system a1462    // plain `nixos-rebuild dry-build` evaluates <nixpkgs/nixos> + <nixos-config>1463    // (channel style) and fails, so pass --flake when the config dir has one.1464    {1465        const argv: []const []const u8 = if (useFlakeFlag(gpa, io, machine))1466            &.{ "sudo", "nixos-rebuild", "dry-build", "--flake", machine.config_path }1467        else1468            &.{ "sudo", "nixos-rebuild", "dry-build" };1469        const r = try capture(gpa, io, machine, argv);1470        defer gpa.free(r.stdout);1471        defer gpa.free(r.stderr);1472        try checks.append(gpa, .{ .name = "config syntax", .status = if (r.exit_code == 0) .ok else .fail });1473    }14741475    // Check channel1476    {1477        const r = try capture(gpa, io, machine, &.{ "nix-channel", "--list" });1478        defer gpa.free(r.stdout);1479        defer gpa.free(r.stderr);1480        const has_channel = r.exit_code == 0 and r.stdout.len > 0;1481        try checks.append(gpa, .{ .name = "channel", .status = if (has_channel) .ok else .warn });1482    }14831484    return checks.toOwnedSlice(gpa);1485}14861487// --- Home Manager ---1488//1489// Home Manager has three usage modes. nina detects which one is in play before1490// any `home` command so it can either drive the standalone CLI or redirect the1491// user to `nina apply` (when HM is a NixOS/flake module activated by rebuild).14921493pub const HomeManagerMode = enum {1494    // home-manager binary on PATH — manages the user env on its own.1495    standalone,1496    // No binary, but a home.nix exists — HM is a NixOS/flake module rebuilt by1497    // nixos-rebuild. `nina home apply` redirects to `nina apply`.1498    module,1499    none,1500};15011502fn homeConfigDir(gpa: std.mem.Allocator, environ: *const std.process.Environ.Map) ?[]const u8 {1503    const home = environ.get("HOME") orelse return null;1504    return std.fmt.allocPrint(gpa, "{s}/.config/home-manager", .{home}) catch null;1505}15061507// Path to the standalone home.nix. Caller frees.1508pub fn homeNixPath(gpa: std.mem.Allocator, environ: *const std.process.Environ.Map) ?[]const u8 {1509    const dir = homeConfigDir(gpa, environ) orelse return null;1510    defer gpa.free(dir);1511    return std.fmt.allocPrint(gpa, "{s}/home.nix", .{dir}) catch null;1512}15131514pub fn pathExists(io: std.Io, path: []const u8) bool {1515    const f = std.Io.Dir.openFile(.cwd(), io, path, .{}) catch return false;1516    f.close(io);1517    return true;1518}15191520// `command -v <name>` — true if the binary resolves on PATH. Silent (captured),1521// unlike streamLocal which would inherit stdio.1522fn commandExists(gpa: std.mem.Allocator, io: std.Io, name: []const u8) bool {1523    var buf: [256]u8 = undefined;1524    const cmd = std.fmt.bufPrint(&buf, "command -v {s} >/dev/null 2>&1", .{name}) catch return false;1525    const r = std.process.run(gpa, io, .{ .argv = &.{ "sh", "-c", cmd } }) catch return false;1526    defer gpa.free(r.stdout);1527    defer gpa.free(r.stderr);1528    return switch (r.term) {1529        .exited => |code| code == 0,1530        else => false,1531    };1532}15331534pub fn detectHomeManager(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) HomeManagerMode {1535    if (commandExists(gpa, io, "home-manager")) return .standalone;1536    if (homeNixPath(gpa, environ)) |p| {1537        defer gpa.free(p);1538        if (pathExists(io, p)) return .module;1539    }1540    return .none;1541}15421543// The home-manager config dir when it holds a flake.nix (a flake-based home1544// config that `home-manager switch --flake` drives). null for a channel-based1545// config, which uses a plain `home-manager switch`. Caller frees.1546pub fn homeFlakeDir(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) ?[]const u8 {1547    const dir = homeConfigDir(gpa, environ) orelse return null;1548    const flake = std.fmt.allocPrint(gpa, "{s}/flake.nix", .{dir}) catch {1549        gpa.free(dir);1550        return null;1551    };1552    defer gpa.free(flake);1553    if (!pathExists(io, flake)) {1554        gpa.free(dir);1555        return null;1556    }1557    return dir;1558}15591560// Platform-specific home-manager attribute "<user>-<arch>-<os>" (e.g.1561// murazaki-x86_64-linux) — the homeConfigurations key many flakes derive from1562// ${USER}-${system}. arch/os come from uname on the local host (home commands1563// are local-only). Caller frees.1564pub fn homeManagerAttr(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, environ: *const std.process.Environ.Map) ![]const u8 {1565    const user = environ.get("USER") orelse "user";15661567    const arch_r = try capture(gpa, io, machine, &.{ "uname", "-m" });1568    defer gpa.free(arch_r.stdout);1569    defer gpa.free(arch_r.stderr);1570    if (arch_r.exit_code != 0) return error.ProcessFailed;1571    const arch = std.mem.trim(u8, arch_r.stdout, " \t\r\n");15721573    const os_r = try capture(gpa, io, machine, &.{ "uname", "-s" });1574    defer gpa.free(os_r.stdout);1575    defer gpa.free(os_r.stderr);1576    if (os_r.exit_code != 0) return error.ProcessFailed;1577    const os = try gpa.dupe(u8, std.mem.trim(u8, os_r.stdout, " \t\r\n"));1578    defer gpa.free(os);1579    for (os) |*ch| ch.* = std.ascii.toLower(ch.*);15801581    if (arch.len == 0 or os.len == 0) return error.ProcessFailed;1582    return std.fmt.allocPrint(gpa, "{s}-{s}-{s}", .{ user, arch, os });1583}15841585// Map a nixos-version string to the matching home-manager branch: an unstable1586// channel ("…pre…"/"unstable") → master; a stable release like1587// "25.05.20250115.abcdef (Warbler)" → release-25.05. Anything unparseable1588// falls back to master. Caller frees.1589fn homeBranchFromVersion(gpa: std.mem.Allocator, version_raw: []const u8) ![]const u8 {1590    const v = std.mem.trim(u8, version_raw, " \t\r\n");1591    if (std.mem.indexOf(u8, v, "pre") != null or1592        std.mem.indexOf(u8, v, "unstable") != null)1593        return gpa.dupe(u8, "master");15941595    const head = v[0 .. std.mem.indexOfScalar(u8, v, ' ') orelse v.len];1596    var it = std.mem.splitScalar(u8, head, '.');1597    const major = it.next() orelse "";1598    const minor = it.next() orelse "";1599    if (allDigits(major) and allDigits(minor))1600        return std.fmt.allocPrint(gpa, "release-{s}.{s}", .{ major, minor });16011602    return gpa.dupe(u8, "master");1603}16041605fn allDigits(s: []const u8) bool {1606    if (s.len == 0) return false;1607    for (s) |ch| if (!std.ascii.isDigit(ch)) return false;1608    return true;1609}16101611test "homeBranchFromVersion maps channels to HM branches" {1612    const a = std.testing.allocator;1613    const cases = [_]struct { in: []const u8, want: []const u8 }{1614        .{ .in = "25.05.20250115.abcdef (Warbler)", .want = "release-25.05" },1615        .{ .in = "24.11.20241201.deadbee (Vicuna)", .want = "release-24.11" },1616        .{ .in = "25.11pre-git", .want = "master" },1617        .{ .in = "25.05pre789012.abcdef (Warbler)", .want = "master" },1618        .{ .in = "nixos-unstable", .want = "master" },1619        .{ .in = "garbage", .want = "master" },1620    };1621    for (cases) |c| {1622        const got = try homeBranchFromVersion(a, c.in);1623        defer a.free(got);1624        try std.testing.expectEqualStrings(c.want, got);1625    }1626}16271628// The home-manager branch matching the running nixpkgs. Falls back to master1629// when nixos-version is unavailable (non-NixOS host). Caller frees.1630fn detectHomeManagerBranch(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]const u8 {1631    const r = capture(gpa, io, machine, &.{"nixos-version"}) catch1632        return gpa.dupe(u8, "master");1633    defer gpa.free(r.stdout);1634    defer gpa.free(r.stderr);1635    if (r.exit_code != 0) return gpa.dupe(u8, "master");1636    return homeBranchFromVersion(gpa, r.stdout);1637}16381639// `nix run home-manager/<branch> -- init [--switch] [dir]` — generates1640// flake.nix + home.nix (in dir, or ~/.config/home-manager by default),1641// activating immediately when switch_on_init is set.1642pub fn homeManagerInit(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, switch_on_init: bool, dir: ?[]const u8) !u8 {1643    const branch = try detectHomeManagerBranch(gpa, io, machine);1644    defer gpa.free(branch);1645    const flake_ref = try std.fmt.allocPrint(gpa, "home-manager/{s}", .{branch});1646    defer gpa.free(flake_ref);16471648    var argv: std.ArrayList([]const u8) = .empty;1649    defer argv.deinit(gpa);1650    try argv.appendSlice(gpa, &.{ "nix", "run", flake_ref, "--", "init" });1651    if (switch_on_init) try argv.append(gpa, "--switch");1652    if (dir) |d| try argv.append(gpa, d);16531654    return stream(io, machine, gpa, argv.items);1655}16561657pub fn homeManagerSwitch(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1658    output.flush();1659    const r = try capture(gpa, io, machine, &.{ "home-manager", "switch" });1660    defer gpa.free(r.stdout);1661    defer gpa.free(r.stderr);1662    errors.setBuildStderr(r.stderr);1663    return r.exit_code;1664}16651666// Outcome of a flake-based switch, so the caller can fall back to a less1667// specific attribute on a missing-attribute evaluation error — but never on a1668// genuine build failure.1669pub const SwitchOutcome = enum { ok, attr_missing, failed };16701671pub fn homeManagerSwitchFlake(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, flake_ref: []const u8) !SwitchOutcome {1672    output.flush();1673    const r = try capture(gpa, io, machine, &.{ "home-manager", "switch", "--flake", flake_ref });1674    defer gpa.free(r.stdout);1675    defer gpa.free(r.stderr);1676    if (r.exit_code == 0) return .ok;1677    // A flake that doesn't define this homeConfiguration fails during evaluation1678    // with "does not provide attribute" — surface that so the caller can retry a1679    // different attr rather than treating it as a build failure.1680    if (std.mem.indexOf(u8, r.stderr, "does not provide attribute") != null)1681        return .attr_missing;1682    errors.setBuildStderr(r.stderr);1683    return .failed;1684}16851686// home-manager has no system-profile rollback; it re-activates the previous1687// generation via `switch --rollback`.1688pub fn homeManagerRollback(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1689    output.flush();1690    const r = try capture(gpa, io, machine, &.{ "home-manager", "switch", "--rollback" });1691    defer gpa.free(r.stdout);1692    defer gpa.free(r.stderr);1693    errors.setBuildStderr(r.stderr);1694    return r.exit_code;1695}16961697// Build (and validate) the home config without activating it — used by `home1698// check` and `home apply --dry`. `home-manager build` drops a ./result symlink1699// in the cwd, so run it in a throwaway temp dir to avoid littering the directory1700// nina was invoked from.1701pub fn homeManagerBuild(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1702    output.flush();1703    const r = try capture(gpa, io, machine, &.{ "sh", "-c", "d=$(mktemp -d) && cd \"$d\" && home-manager build" });1704    defer gpa.free(r.stdout);1705    defer gpa.free(r.stderr);1706    errors.setBuildStderr(r.stderr);1707    return r.exit_code;1708}17091710pub fn homeGenerations(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1711    const r = try capture(gpa, io, machine, &.{ "home-manager", "generations" });1712    defer gpa.free(r.stderr);1713    if (r.exit_code != 0) {1714        gpa.free(r.stdout);1715        return error.ProcessFailed;1716    }1717    return r.stdout;1718}17191720// Store paths referenced by a home generation — used to list managed packages.1721pub fn homeGenerationReferences(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, gen_path: []const u8) ![]u8 {1722    const r = try capture(gpa, io, machine, &.{ "nix-store", "-q", "--references", gen_path });1723    defer gpa.free(r.stderr);1724    if (r.exit_code != 0) {1725        gpa.free(r.stdout);1726        return error.ProcessFailed;1727    }1728    return r.stdout;1729}17301731// diff-closures between two arbitrary store paths (home generations), mirroring1732// diffClosures' tty/piped color handling.1733pub fn diffClosuresPaths(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, a_path: []const u8, b_path: []const u8) !u8 {1734    if (output.colorEnabled()) {1735        return stream(io, machine, gpa, &.{ "nix", "store", "diff-closures", a_path, b_path });1736    }1737    const r = try capture(gpa, io, machine, &.{ "nix", "store", "diff-closures", a_path, b_path });1738    defer gpa.free(r.stdout);1739    defer gpa.free(r.stderr);1740    const cleaned = try stripAnsi(gpa, r.stdout);1741    defer gpa.free(cleaned);1742    output.raw(cleaned);1743    return r.exit_code;1744}17451746// --- Log ---17471748pub fn readNinaLog(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map, last: u32) ![]u8 {1749    const home = environ.get("HOME") orelse return error.FileNotFound;1750    const path = try std.fmt.allocPrint(gpa, "{s}/.nina.log", .{home});1751    defer gpa.free(path);1752    const content = std.Io.Dir.readFileAlloc(.cwd(), io, path, gpa, .unlimited) catch return error.FileNotFound;1753    if (last == 0) return content;17541755    // Collect non-empty lines, then keep only the final `last`. Slices point into1756    // `content`, so copy them out before freeing it.1757    var lines: std.ArrayList([]const u8) = .empty;1758    defer lines.deinit(gpa);1759    var it = std.mem.splitScalar(u8, content, '\n');1760    while (it.next()) |line| {1761        if (std.mem.trim(u8, line, " \t\r").len == 0) continue;1762        try lines.append(gpa, line);1763    }1764    if (lines.items.len <= last) return content;17651766    var out: std.ArrayList(u8) = .empty;1767    errdefer out.deinit(gpa);1768    for (lines.items[lines.items.len - last ..]) |line| {1769        try out.appendSlice(gpa, line);1770        try out.append(gpa, '\n');1771    }1772    gpa.free(content);1773    return out.toOwnedSlice(gpa);1774}17751776// nina is a one-shot process, so "did the last apply fail this session?" can't1777// live in memory — it's persisted as a ~/.nina-apply-failed flag, mirroring the1778// other ~/.nina-* state files. This lets a later successful apply earn the1779// excited kaomoji. mark sets it; take reads-and-clears so it fires exactly once.1780pub fn markApplyFailed(io: std.Io, environ: *const std.process.Environ.Map) void {1781    const home = environ.get("HOME") orelse return;1782    var buf: [512]u8 = undefined;1783    const path = std.fmt.bufPrint(&buf, "{s}/.nina-apply-failed", .{home}) catch return;1784    const file = std.Io.Dir.createFile(.cwd(), io, path, .{}) catch return;1785    file.close(io);1786}17871788pub fn takeApplyFailed(io: std.Io, environ: *const std.process.Environ.Map) bool {1789    const home = environ.get("HOME") orelse return false;1790    var buf: [512]u8 = undefined;1791    const path = std.fmt.bufPrint(&buf, "{s}/.nina-apply-failed", .{home}) catch return false;1792    if (std.Io.Dir.openFile(.cwd(), io, path, .{})) |f| {1793        f.close(io);1794        std.Io.Dir.deleteFile(.cwd(), io, path) catch {};1795        return true;1796    } else |_| {1797        return false;1798    }1799}18001801pub fn appendNinaLog(io: std.Io, environ: *const std.process.Environ.Map, entry: []const u8) void {1802    const home = environ.get("HOME") orelse return;1803    var path_buf: [512]u8 = undefined;1804    const path = std.fmt.bufPrint(&path_buf, "{s}/.nina.log", .{home}) catch return;1805    const file = std.Io.Dir.openFile(.cwd(), io, path, .{ .mode = .read_write }) catch1806        (std.Io.Dir.createFile(.cwd(), io, path, .{}) catch return);1807    defer file.close(io);1808    const size = file.length(io) catch 0;1809    file.writePositionalAll(io, entry, size) catch {};1810}18111812// --- Update helpers ---18131814// Fetch a URL with curl and return the response body. Caller must free.1815// error.NetworkError = DNS/connect failure; error.HttpError = non-2xx response.1816pub fn fetchUrl(gpa: std.mem.Allocator, io: std.Io, url: []const u8) ![]u8 {1817    const argv = [_][]const u8{1818        "curl", "-s", "-L", "-w", "\nHTTP_STATUS:%{http_code}", "-m", "30", "--", url,1819    };1820    const result = std.process.run(gpa, io, .{ .argv = &argv }) catch return error.NetworkError;1821    defer gpa.free(result.stderr);18221823    const marker = "\nHTTP_STATUS:";1824    const mark_idx = std.mem.lastIndexOf(u8, result.stdout, marker) orelse {1825        gpa.free(result.stdout);1826        return error.NetworkError;1827    };1828    const status_str = std.mem.trim(u8, result.stdout[mark_idx + marker.len ..], " \r\n");1829    const status = std.fmt.parseInt(u16, status_str, 10) catch {1830        gpa.free(result.stdout);1831        return error.NetworkError;1832    };1833    if (status == 0) { gpa.free(result.stdout); return error.NetworkError; }1834    if (status < 200 or status >= 300) { gpa.free(result.stdout); return error.HttpError; }1835    const body = gpa.dupe(u8, result.stdout[0..mark_idx]) catch |e| {1836        gpa.free(result.stdout);1837        return e;1838    };1839    gpa.free(result.stdout);1840    return body;1841}18421843// Download a URL to a temp file. Returns the temp path (caller must gpa.free).1844// The file is written to /tmp/nina-update-<pid> and left for the caller to use.1845pub fn downloadToTemp(gpa: std.mem.Allocator, io: std.Io, url: []const u8) ![]u8 {1846    const tmp_path = try gpa.dupe(u8, "/tmp/nina-update.bin");1847    errdefer gpa.free(tmp_path);18481849    var child = std.process.spawn(io, .{1850        .argv = &.{ "curl", "-fsSL", "-m", "300", "-o", tmp_path, "--", url },1851        .stdin = .close,1852        .stdout = .close,1853        .stderr = .inherit,1854    }) catch return error.NetworkError;1855    const term = child.wait(io) catch return error.NetworkError;1856    switch (term) {1857        .exited => |c| if (c != 0) return error.NetworkError,1858        else => return error.NetworkError,1859    }1860    return tmp_path;1861}18621863// Get the current executable path into buf. Returns slice of buf.1864pub fn selfExePath(io: std.Io, buf: *[std.Io.Dir.max_path_bytes]u8) ![]const u8 {1865    const len = try std.process.executablePath(io, buf);1866    return buf[0..len];1867}18681869// Verify blake3 of tmp_path against expected_hex (raw hex, no prefix), then1870// atomically install the binary to install_path. Errors: ChecksumMismatch,1871// AccessDenied (with error_info set), or underlying I/O errors.1872pub fn verifyAndInstall(gpa: std.mem.Allocator, io: std.Io, tmp_path: []const u8, expected_hex: []const u8, install_path: []const u8) !void {1873    const bytes = std.Io.Dir.readFileAlloc(.cwd(), io, tmp_path, gpa, .unlimited) catch {1874        errors.error_info.setMessage("downloaded file not found: {s}", .{tmp_path});1875        return error.FileNotFound;1876    };1877    defer gpa.free(bytes);18781879    var hasher = std.crypto.hash.Blake3.init(.{});1880    hasher.update(bytes);1881    var raw: [32]u8 = undefined;1882    hasher.final(&raw);1883    const hex = std.fmt.bytesToHex(raw, .lower);1884    if (!std.mem.eql(u8, &hex, expected_hex)) return error.ChecksumMismatch;18851886    var inst_tmp_buf: [std.Io.Dir.max_path_bytes + 8]u8 = undefined;1887    const inst_tmp = std.fmt.bufPrint(&inst_tmp_buf, "{s}.new", .{install_path}) catch1888        return error.NameTooLong;18891890    {1891        const f = std.Io.Dir.createFileAbsolute(io, inst_tmp, .{}) catch {1892            errors.error_info.setMessage("cannot write to {s}", .{install_path});1893            errors.error_info.setSuggestion("try: sudo nina update", .{});1894            return error.AccessDenied;1895        };1896        defer f.close(io);1897        f.writePositionalAll(io, bytes, 0) catch {1898            errors.error_info.setMessage("cannot write to {s}", .{install_path});1899            return error.AccessDenied;1900        };1901        try f.setPermissions(io, .fromMode(0o755));1902    }1903    errdefer std.Io.Dir.deleteFileAbsolute(io, inst_tmp) catch {};19041905    if (comptime builtin.os.tag == .macos) {1906        _ = captureLocal(gpa, io, &.{ "codesign", "-f", "-s", "-", inst_tmp }) catch {};1907    }19081909    std.Io.Dir.renameAbsolute(inst_tmp, install_path, io) catch |e| switch (e) {1910        error.AccessDenied => {1911            errors.error_info.setMessage("cannot replace {s}", .{install_path});1912            errors.error_info.setSuggestion("try: sudo nina update", .{});1913            return error.AccessDenied;1914        },1915        else => return e,1916    };1917}19181919// --- Nix feature setup ---19201921pub const NixFeatureStatus = struct {1922    nix_command: bool = false,1923    flakes: bool = false,19241925    pub fn allEnabled(self: NixFeatureStatus) bool {1926        return self.nix_command and self.flakes;1927    }1928};19291930fn scanConfFeatures(conf: []const u8, status: *NixFeatureStatus) void {1931    var lines = std.mem.splitScalar(u8, conf, '\n');1932    while (lines.next()) |line| {1933        const trimmed = std.mem.trim(u8, line, " \t");1934        if (!std.mem.startsWith(u8, trimmed, "experimental-features")) continue;1935        if (std.mem.indexOf(u8, trimmed, "nix-command") != null) status.nix_command = true;1936        if (std.mem.indexOf(u8, trimmed, "flakes") != null) status.flakes = true;1937    }1938}19391940pub fn checkNixFeatures(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) NixFeatureStatus {1941    var status = NixFeatureStatus{};19421943    if (std.Io.Dir.readFileAlloc(.cwd(), io, "/etc/nix/nix.conf", gpa, .unlimited) catch null) |conf| {1944        defer gpa.free(conf);1945        scanConfFeatures(conf, &status);1946    }19471948    if (environ.get("HOME")) |home| {1949        var buf: [512]u8 = undefined;1950        const path = std.fmt.bufPrint(&buf, "{s}/.config/nix/nix.conf", .{home}) catch return status;1951        if (std.Io.Dir.readFileAlloc(.cwd(), io, path, gpa, .unlimited) catch null) |conf| {1952            defer gpa.free(conf);1953            scanConfFeatures(conf, &status);1954        }1955    }19561957    return status;1958}19591960pub fn isNixOS(io: std.Io) bool {1961    const file = std.Io.Dir.openFile(.cwd(), io, "/etc/NIXOS", .{}) catch return false;1962    file.close(io);1963    return true;1964}19651966// Appends `experimental-features = nix-command flakes` to ~/.config/nix/nix.conf.1967// Returns the path written (caller must free).1968pub fn enableNixFeatures(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) ![]const u8 {1969    const home = environ.get("HOME") orelse {1970        errors.error_info.setMessage("HOME not set", .{});1971        return error.ConfigNotFound;1972    };19731974    const dir_path = try std.fmt.allocPrint(gpa, "{s}/.config/nix", .{home});1975    defer gpa.free(dir_path);1976    const file_path = try std.fmt.allocPrint(gpa, "{s}/.config/nix/nix.conf", .{home});1977    errdefer gpa.free(file_path);19781979    _ = captureLocal(gpa, io, &.{ "mkdir", "-p", dir_path }) catch {};19801981    const line = "experimental-features = nix-command flakes\n";1982    const file = std.Io.Dir.openFile(.cwd(), io, file_path, .{ .mode = .read_write }) catch1983        (std.Io.Dir.createFile(.cwd(), io, file_path, .{}) catch {1984        errors.error_info.setMessage("could not write {s}", .{file_path});1985        return error.FileNotFound;1986    });1987    defer file.close(io);19881989    const size = file.length(io) catch 0;1990    file.writePositionalAll(io, line, size) catch {1991        errors.error_info.setMessage("could not write {s}", .{file_path});1992        return error.FileNotFound;1993    };19941995    return file_path;1996}19971998// --- NixOS: declarative experimental-features ---1999//2000// On NixOS the permanent, declarative home for these flags is configuration.nix,2001// not ~/.config/nix/nix.conf. nina offers to add this one line and then leaves2002// the `nixos-rebuild switch` to the user.20032004pub const NIXOS_FEATURES_LINE =2005    "nix.settings.experimental-features = [ \"nix-command\" \"flakes\" ];";20062007// Best-effort, non-sudo check (configuration.nix is 0644 by default). Returns2008// false on any read error so the caller still offers to add the line.2009pub fn nixosConfigEnablesFeatures(gpa: std.mem.Allocator, io: std.Io, path: []const u8) bool {2010    const conf = std.Io.Dir.readFileAlloc(.cwd(), io, path, gpa, .unlimited) catch return false;2011    defer gpa.free(conf);2012    return std.mem.indexOf(u8, conf, "experimental-features") != null and2013        std.mem.indexOf(u8, conf, "nix-command") != null and2014        std.mem.indexOf(u8, conf, "flakes") != null;2015}20162017fn readMaybeSudo(gpa: std.mem.Allocator, io: std.Io, path: []const u8) ![]u8 {2018    if (std.Io.Dir.readFileAlloc(.cwd(), io, path, gpa, .unlimited) catch null) |data| return data;2019    return captureLocal(gpa, io, &.{ "sudo", "cat", path });2020}20212022// Insert NIXOS_FEATURES_LINE just before the final `}` of configuration.nix2023// (i.e. inside the top-level attribute set) and write it back via a single2024// `sudo cp`, which prompts for the password on the terminal. Returns an error2025// for the caller to fall back to printed manual instructions.2026pub fn appendFeaturesToNixosConfig(2027    gpa: std.mem.Allocator,2028    io: std.Io,2029    environ: *const std.process.Environ.Map,2030    path: []const u8,2031) !void {2032    const conf = readMaybeSudo(gpa, io, path) catch {2033        errors.error_info.setMessage("could not read {s}", .{path});2034        return error.ConfigNotFound;2035    };2036    defer gpa.free(conf);20372038    if (std.mem.indexOf(u8, conf, "experimental-features") != null) return; // already declared20392040    const brace = std.mem.lastIndexOfScalar(u8, conf, '}') orelse {2041        errors.error_info.setMessage("no closing brace in {s} — add the line by hand", .{path});2042        return error.MalformedConfig;2043    };20442045    const home = environ.get("HOME") orelse {2046        errors.error_info.setMessage("HOME not set", .{});2047        return error.ConfigNotFound;2048    };2049    const tmp_path = try std.fmt.allocPrint(gpa, "{s}/.nina-configuration.nix", .{home});2050    defer gpa.free(tmp_path);20512052    var buf: std.ArrayList(u8) = .empty;2053    defer buf.deinit(gpa);2054    try buf.appendSlice(gpa, conf[0..brace]);2055    if (brace == 0 or conf[brace - 1] != '\n') try buf.append(gpa, '\n');2056    try buf.appendSlice(gpa, "  # added by nina setup — flakes + the new nix CLI\n");2057    try buf.appendSlice(gpa, "  ");2058    try buf.appendSlice(gpa, NIXOS_FEATURES_LINE);2059    try buf.append(gpa, '\n');2060    try buf.appendSlice(gpa, conf[brace..]);20612062    const tmp = std.Io.Dir.createFile(.cwd(), io, tmp_path, .{}) catch {2063        errors.error_info.setMessage("could not write {s}", .{tmp_path});2064        return error.FileNotFound;2065    };2066    tmp.writePositionalAll(io, buf.items, 0) catch {2067        tmp.close(io);2068        std.Io.Dir.deleteFile(.cwd(), io, tmp_path) catch {};2069        errors.error_info.setMessage("could not write {s}", .{tmp_path});2070        return error.FileNotFound;2071    };2072    tmp.close(io);20732074    // Back up the existing config, then replace it — in one sudo call so the2075    // password is asked for at most once. Paths travel as positional args ($0,2076    // $1) to sidestep shell quoting.2077    const code = streamLocal(io, &.{2078        "sudo", "sh", "-c", "cp -- \"$0\" \"$0.nina-bak\" && cp -- \"$1\" \"$0\"", path, tmp_path,2079    }) catch {2080        std.Io.Dir.deleteFile(.cwd(), io, tmp_path) catch {};2081        errors.error_info.setMessage("could not write {s}", .{path});2082        return error.ProcessFailed;2083    };2084    std.Io.Dir.deleteFile(.cwd(), io, tmp_path) catch {};2085    if (code != 0) {2086        errors.error_info.setMessage("sudo cp into {s} failed", .{path});2087        return error.ProcessFailed;2088    }2089}