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 ---651652// Stream with one extra environment variable injected alongside the inherited env.653// Used for cases like NIXPKGS_ALLOW_UNFREE=1 where we need a single override654// without replacing the full parent environment.655fn streamWithEnvVar(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, cmd: []const []const u8, base_env: *const std.process.Environ.Map, key: []const u8, val: []const u8) !u8 {656    output.flush();657    const argv = try buildArgv(gpa, machine, cmd);658    defer if (!machine.local) gpa.free(argv);659660    var env = try base_env.clone(gpa);661    defer env.deinit();662    try env.put(key, val);663664    var child = std.process.spawn(io, .{665        .argv = argv,666        .stdin = .inherit,667        .stdout = .inherit,668        .stderr = .inherit,669        .environ_map = &env,670    }) catch |e| {671        errors.error_info.setMessage("failed to spawn: {s}", .{cmd[0]});672        return e;673    };674675    const term = child.wait(io) catch |e| {676        errors.error_info.setMessage("process wait failed", .{});677        return e;678    };679680    return switch (term) {681        .exited => |c| c,682        else => 1,683    };684}685686pub fn profileInstall(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, environ: *const std.process.Environ.Map, attr: []const u8, allow_unfree: bool) !u8 {687    const pkg_ref = try std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{attr});688    defer gpa.free(pkg_ref);689    // `nix profile add` is the current verb; `install` is a deprecated alias that690    // prints a warning on modern nix.691    if (allow_unfree) {692        // The package is unfree and the user's system-wide allowUnfree setting693        // doesn't propagate to imperative nix commands. Pass NIXPKGS_ALLOW_UNFREE=1694        // and --impure so the profile add succeeds: --impure allows builtins.getEnv695        // to read the env var inside the nixpkgs flake's pure evaluation context.696        return streamWithEnvVar(io, machine, gpa, &.{ "nix", "profile", "add", "--impure", pkg_ref }, environ, "NIXPKGS_ALLOW_UNFREE", "1");697    }698    return stream(io, machine, gpa, &.{ "nix", "profile", "add", pkg_ref });699}700701pub fn profileRemove(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, attr: []const u8) !u8 {702    // `nix profile remove` matches by profile element name (e.g. "ripgrep"), not703    // by flake ref — passing nixpkgs#ripgrep matches nothing.704    return stream(io, machine, gpa, &.{ "nix", "profile", "remove", attr });705}706707pub fn profileList(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {708    const r = try capture(gpa, io, machine, &.{ "nix", "profile", "list" });709    defer gpa.free(r.stderr);710    if (r.exit_code != 0) return error.ProcessFailed;711    return r.stdout;712}713714// Machine-readable profile listing — caller parses elements -> name + version.715pub fn profileListJson(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {716    const r = try capture(gpa, io, machine, &.{ "nix", "profile", "list", "--json" });717    defer gpa.free(r.stderr);718    if (r.exit_code != 0) {719        gpa.free(r.stdout);720        return error.ProcessFailed;721    }722    return r.stdout;723}724725// Returns the profile element name to pass to `nix profile remove/upgrade`726// (e.g. "nina" or "default"), or null if nina is not found. Caller owns the727// returned slice. A NixOS system-package install also resolves into /nix/store728// so the store path alone can't distinguish it from a profile install — the729// profile list can. A missing/empty profile (or no nix) returns null.730pub fn profileNinaElement(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ?[]const u8 {731    const js = profileListJson(gpa, io, machine) catch return null;732    defer gpa.free(js);733    return profileJsonNinaElement(gpa, js);734}735736737pub fn profileHasNina(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) bool {738    const name = profileNinaElement(gpa, io, machine) orelse return false;739    gpa.free(name);740    return true;741}742743// True when a nix store path belongs to the nina package. Store paths have the744// form /nix/store/<32-char-hash>-<pname>-<version>[/<subpath>]. We check that745// the 33 chars after /nix/store/ are the hash+dash, and the pname that follows746// is exactly "nina" (followed by "-" or end-of-component).747fn storePathIsNina(path: []const u8) bool {748    const prefix = "/nix/store/";749    if (!std.mem.startsWith(u8, path, prefix)) return false;750    const rel = path[prefix.len..];751    // The store entry name ends at the first "/" (if any sub-path follows).752    const entry = rel[0 .. std.mem.indexOf(u8, rel, "/") orelse rel.len];753    if (entry.len < 34) return false; // 32-char hash + dash + at least one char754    const pname_ver = entry[33..]; // skip hash + dash755    return std.mem.startsWith(u8, pname_ver, "nina-") or std.mem.eql(u8, pname_ver, "nina");756}757758// Pure parse of `nix profile list --json` for a nina element, returning its759// element name (the key to pass to `nix profile remove/upgrade`) or null.760// Newer nix (2.18+) keys elements by pname ("nina"). Older nix uses an array761// with an "attrPath" field. Tarball installs via the `default` output may use762// the key "default" instead of "nina"; we detect those via storePaths.763fn profileJsonNinaElement(gpa: std.mem.Allocator, js: []const u8) ?[]const u8 {764    var parsed = std.json.parseFromSlice(std.json.Value, gpa, js, .{}) catch return null;765    defer parsed.deinit();766    const root = parsed.value;767    if (root != .object) return null;768    const elements = root.object.get("elements") orelse return null;769    switch (elements) {770        .object => |obj| {771            // Fast path: exact "nina" key (nix 2.18+ with nixpkgs#nina install).772            if (obj.contains("nina")) return gpa.dupe(u8, "nina") catch null;773            // Fallback: scan storePaths. Handles tarball installs where the default774            // output is selected and nix names the element "default" (older nix) or775            // some other key derived from the attrPath rather than the pname.776            var it = obj.iterator();777            while (it.next()) |kv| {778                const val = kv.value_ptr.*;779                if (val != .object) continue;780                const sps = val.object.get("storePaths") orelse continue;781                if (sps != .array) continue;782                for (sps.array.items) |sp| {783                    if (sp == .string and storePathIsNina(sp.string))784                        return gpa.dupe(u8, kv.key_ptr.*) catch null;785                }786            }787            return null;788        },789        .array => |arr| {790            // Older nix array format. Element name is the last component of attrPath.791            for (arr.items) |el| {792                if (el != .object) continue;793                const ap = el.object.get("attrPath") orelse continue;794                if (ap != .string) continue;795                if (std.mem.eql(u8, ap.string, "nina") or796                    std.mem.endsWith(u8, ap.string, ".nina"))797                    return gpa.dupe(u8, "nina") catch null;798                // Tarball default-output install: attrPath ends in ".default" but799                // storePaths point to nina. Return "default" as the element name.800                const sps = el.object.get("storePaths") orelse continue;801                if (sps != .array) continue;802                for (sps.array.items) |sp| {803                    if (sp != .string) continue;804                    if (!storePathIsNina(sp.string)) continue;805                    const dot = std.mem.lastIndexOf(u8, ap.string, ".") orelse 0;806                    const el_name = if (dot > 0) ap.string[dot + 1 ..] else ap.string;807                    return gpa.dupe(u8, el_name) catch null;808                }809            }810            return null;811        },812        else => return null,813    }814}815816test "profileJsonNinaElement finds element name from profile JSON" {817    const a = std.testing.allocator;818819    // Newer nix: elements keyed by pname. "nina" key present.820    const named =821        \\{"elements":{"bat":{"storePaths":["/nix/store/h0000000000000000000000000000000-bat-0.26.1"]},822        \\"nina":{"attrPath":"packages.x86_64-linux.nina","storePaths":["/nix/store/a0000000000000000000000000000000-nina-3.0.15"]}},"version":3}823    ;824    const r1 = profileJsonNinaElement(a, named);825    defer if (r1) |n| a.free(n);826    try std.testing.expectEqualStrings("nina", r1.?);827828    // Tarball install via default output: element keyed as "default", storePath is nina.829    const default_key =830        \\{"elements":{"default":{"attrPath":"packages.x86_64-linux.default","storePaths":["/nix/store/w0000000000000000000000000000000-nina-3.0.16"]}},"version":3}831    ;832    const r2 = profileJsonNinaElement(a, default_key);833    defer if (r2) |n| a.free(n);834    try std.testing.expectEqualStrings("default", r2.?);835836    // Decoy: storePath of another package contains "nina" as a substring but is not nina.837    const decoy =838        \\{"elements":{"luminance":{"storePaths":["/nix/store/x0000000000000000000000000000000-luminance-nina-1.0"]}},"version":3}839    ;840    const r3 = profileJsonNinaElement(a, decoy);841    try std.testing.expectEqual(@as(?[]const u8, null), r3);842843    // Older nix array schema, attrPath ending in ".nina".844    const arr =845        \\{"elements":[{"attrPath":"legacyPackages.x86_64-linux.nina","storePaths":["/nix/store/a0000000000000000000000000000000-nina-3.0.15"]}],"version":2}846    ;847    const r4 = profileJsonNinaElement(a, arr);848    defer if (r4) |n| a.free(n);849    try std.testing.expectEqualStrings("nina", r4.?);850851    // Older nix array schema, tarball default-output install.852    const arr_default =853        \\{"elements":[{"attrPath":"packages.x86_64-linux.default","storePaths":["/nix/store/w0000000000000000000000000000000-nina-3.0.16"]}],"version":2}854    ;855    const r5 = profileJsonNinaElement(a, arr_default);856    defer if (r5) |n| a.free(n);857    try std.testing.expectEqualStrings("default", r5.?);858859    // Empty / malformed → null.860    try std.testing.expectEqual(@as(?[]const u8, null), profileJsonNinaElement(a, "{\"elements\":{},\"version\":3}"));861    try std.testing.expectEqual(@as(?[]const u8, null), profileJsonNinaElement(a, "not json"));862}863864// The store paths that make up the running system environment. Each reference is865// a <hash>-<name>-<version> path, so the caller can list system packages with866// versions — there is no cleaner per-package list for environment.systemPackages.867pub fn systemPackagePaths(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {868    const r = try capture(gpa, io, machine, &.{ "nix-store", "-q", "--references", "/run/current-system/sw" });869    defer gpa.free(r.stderr);870    if (r.exit_code != 0) {871        gpa.free(r.stdout);872        return error.ProcessFailed;873    }874    return r.stdout;875}876877pub fn profileUpgrade(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {878    return stream(io, machine, gpa, &.{ "nix", "profile", "upgrade", ".*" });879}880881// --- Store ---882883pub fn storeGc(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {884    return stream(io, machine, gpa, &.{ "sudo", "nix-collect-garbage" });885}886887pub fn storeVerify(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {888    return stream(io, machine, gpa, &.{ "nix", "store", "verify", "--all" });889}890891// Deduplicate identical store files via hard links — frees space without892// garbage-collecting any paths.893pub fn storeOptimise(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {894    return stream(io, machine, gpa, &.{ "nix", "store", "optimise" });895}896897pub const SystemStatus = struct { size: []u8, age: []u8 };898899// One read-only pass for `nina status`: the current system's closure size (a900// single `path-info -S` of /run/current-system — fast, unlike -S over the whole901// store) and seconds since the system profile was last switched (its symlink902// mtime). Both are world-readable; no root needed.903const STATUS_SCRIPT =904    \\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} ))"905;906907pub fn systemStatus(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) SystemStatus {908    const unknown = SystemStatus{909        .size = gpa.dupe(u8, "") catch return .{ .size = "", .age = "" },910        .age = gpa.dupe(u8, "") catch return .{ .size = "", .age = "" },911    };912    const r = capture(gpa, io, machine, &.{ "sh", "-c", STATUS_SCRIPT }) catch return unknown;913    defer gpa.free(r.stdout);914    defer gpa.free(r.stderr);915    if (r.exit_code != 0) return unknown;916917    var it = std.mem.tokenizeAny(u8, r.stdout, " \t\n\r");918    const sz_str = it.next() orelse return unknown;919    const age_str = it.next() orelse return unknown;920    const bytes = std.fmt.parseInt(u64, sz_str, 10) catch 0;921    const age_secs = std.fmt.parseInt(u64, age_str, 10) catch 0;922923    gpa.free(unknown.size);924    gpa.free(unknown.age);925    return .{926        .size = humanSize(gpa, bytes) catch (gpa.dupe(u8, "") catch ""),927        .age = humanAgo(gpa, age_secs) catch (gpa.dupe(u8, "") catch ""),928    };929}930931// `systemctl is-system-running` -> "running" / "degraded" / "starting" ... A932// one-word health signal; exits non-zero when degraded, so we read stdout, not933// the code. Caller owns the returned slice.934pub fn systemRunningState(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {935    const r = capture(gpa, io, machine, &.{ "systemctl", "is-system-running" }) catch936        return gpa.dupe(u8, "unknown");937    defer gpa.free(r.stderr);938    const state = std.mem.trim(u8, r.stdout, " \t\n\r");939    const owned = try gpa.dupe(u8, if (state.len > 0) state else "unknown");940    gpa.free(r.stdout);941    return owned;942}943944fn humanAgo(gpa: std.mem.Allocator, secs: u64) ![]u8 {945    if (secs < 60) return std.fmt.allocPrint(gpa, "{d}s ago", .{secs});946    if (secs < 3600) return std.fmt.allocPrint(gpa, "{d}m ago", .{secs / 60});947    if (secs < 86400) return std.fmt.allocPrint(gpa, "{d}h ago", .{secs / 3600});948    return std.fmt.allocPrint(gpa, "{d}d ago", .{secs / 86400});949}950951pub fn storeRepair(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {952    return stream(io, machine, gpa, &.{ "sudo", "nix", "store", "repair", "--all" });953}954955pub fn storeInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) !types.StoreInfo {956    // `nix path-info -S --all` computes the CLOSURE size of every path — O(paths^2)957    // graph work that takes minutes on a real store (59k+ paths) and hangs the958    // command. We don't need closures: `--all --json` (no -S) carries each path's959    // own narSize, so one fast pass gives the path count and the summed store size.960    // `du -sh /nix/store` is just as slow on a big store, so it's gone too.961    // timeout-wrapped so a pathological store degrades to "?" instead of hanging.962    const pi = try capture(gpa, io, machine, &.{ "sh", "-c", "timeout 90 nix path-info --all --json 2>/dev/null" });963    defer gpa.free(pi.stdout);964    defer gpa.free(pi.stderr);965966    const scan = scanStoreJson(pi.stdout);967    const total_owned = try humanSize(gpa, scan.total_bytes);968969    return .{970        .total_size = total_owned,971        .live_paths = scan.count,972        .reclaimable_paths = 0,973    };974}975976const StoreScan = struct { count: u64, total_bytes: u64 };977978// One linear pass over `nix path-info --json`: each path object has exactly one979// "narSize": field, so counting them gives the true path count and summing the980// values gives the total store size — no per-path closure walk.981fn scanStoreJson(json_str: []const u8) StoreScan {982    const needle = "\"narSize\":";983    var count: u64 = 0;984    var total: u64 = 0;985    var i: usize = 0;986    while (std.mem.indexOfPos(u8, json_str, i, needle)) |pos| {987        var j = pos + needle.len;988        while (j < json_str.len and json_str[j] == ' ') : (j += 1) {}989        var val: u64 = 0;990        var any = false;991        while (j < json_str.len and json_str[j] >= '0' and json_str[j] <= '9') : (j += 1) {992            val = val * 10 + (json_str[j] - '0');993            any = true;994        }995        if (any) {996            count += 1;997            total += val;998        }999        i = j;1000    }1001    return .{ .count = count, .total_bytes = total };1002}10031004fn humanSize(gpa: std.mem.Allocator, bytes: u64) ![]u8 {1005    const units = [_][]const u8{ "B", "KB", "MB", "GB", "TB" };1006    var val: f64 = @floatFromInt(bytes);1007    var unit: usize = 0;1008    while (val >= 1024.0 and unit + 1 < units.len) : (unit += 1) val /= 1024.0;1009    if (unit == 0) return std.fmt.allocPrint(gpa, "{d} {s}", .{ bytes, units[0] });1010    return std.fmt.allocPrint(gpa, "{d:.1} {s}", .{ val, units[unit] });1011}10121013pub fn storePath(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, attr: []const u8) ![]u8 {1014    // nixpkgs#<attr>, not .#<attr>: the package lives in nixpkgs (resolved via the1015    // flake registry), not a flake in the current directory.1016    const expr = try std.fmt.allocPrint(gpa, "nixpkgs#{s}.outPath", .{attr});1017    defer gpa.free(expr);1018    const r = try capture(gpa, io, machine, &.{ "nix", "eval", "--raw", expr });1019    defer gpa.free(r.stderr);1020    if (r.exit_code != 0) {1021        gpa.free(r.stdout);1022        return error.ProcessFailed;1023    }1024    return r.stdout;1025}10261027// --- Flake ---10281029pub fn flakeUpdate(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, input: ?[]const u8) !u8 {1030    if (input) |inp| {1031        return stream(io, machine, gpa, &.{ "nix", "flake", "update", inp });1032    }1033    return stream(io, machine, gpa, &.{ "nix", "flake", "update" });1034}10351036// Update flake inputs for the flake living in `dir` (the config dir). `nix flake1037// update` operates on the flake in the working directory, so we cd there first.1038// Used by `nina upgrade` on a flake system in place of nix-channel --update.1039pub fn flakeUpdateAt(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, dir: []const u8) !u8 {1040    return stream(io, machine, gpa, &.{ "sh", "-c", "cd \"$0\" && nix flake update", dir });1041}10421043pub fn flakeCheck(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1044    return stream(io, machine, gpa, &.{ "nix", "flake", "check" });1045}10461047pub fn flakeInit(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1048    return stream(io, machine, gpa, &.{ "nix", "flake", "init" });1049}10501051pub fn flakeLock(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1052    return stream(io, machine, gpa, &.{ "nix", "flake", "lock" });1053}10541055pub fn flakeClone(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, url: []const u8) !u8 {1056    return stream(io, machine, gpa, &.{ "nix", "flake", "clone", url });1057}10581059pub fn flakeShow(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1060    const r = try capture(gpa, io, machine, &.{ "nix", "flake", "show", "--json" });1061    defer gpa.free(r.stderr);1062    if (r.exit_code != 0) {1063        gpa.free(r.stdout);1064        return error.ProcessFailed;1065    }1066    return r.stdout;1067}10681069// --- Build / Run / Develop ---10701071pub fn nixBuild(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, attr: ?[]const u8) !u8 {1072    if (attr) |a| {1073        const ref = try std.fmt.allocPrint(gpa, ".#{s}", .{a});1074        defer gpa.free(ref);1075        return stream(io, machine, gpa, &.{ "nix", "build", ref });1076    }1077    return stream(io, machine, gpa, &.{ "nix", "build" });1078}10791080pub fn nixRun(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1081    // nix run always gets --no-write-lock-file for remote URLs1082    const is_url = std.mem.startsWith(u8, pkg, "http://") or std.mem.startsWith(u8, pkg, "https://") or std.mem.startsWith(u8, pkg, "github:");1083    if (is_url) {1084        return stream(io, machine, gpa, &.{ "nix", "run", pkg, "--no-write-lock-file" });1085    }1086    // Already a flake ref (contains '#') → use as-is; bare name → default to nixpkgs#.1087    if (std.mem.indexOfScalar(u8, pkg, '#') != null) {1088        return stream(io, machine, gpa, &.{ "nix", "run", pkg });1089    }1090    const ref = try std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{pkg});1091    defer gpa.free(ref);1092    return stream(io, machine, gpa, &.{ "nix", "run", ref });1093}10941095pub fn nixShell(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1096    const ref = try std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{pkg});1097    defer gpa.free(ref);1098    return stream(io, machine, gpa, &.{ "nix", "shell", ref });1099}11001101pub fn nixShellPs1(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8, base_env: *const std.process.Environ.Map) !u8 {1102    const ref = try std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{pkg});1103    defer gpa.free(ref);1104    const ps1 = try std.fmt.allocPrint(gpa, "(nina: {s}) -> ", .{pkg});1105    defer gpa.free(ps1);1106    if (machine.local) {1107        const rc_path = try createInteractiveShellRc(gpa, io);1108        defer {1109            std.Io.Dir.deleteFile(.cwd(), io, rc_path) catch {};1110            gpa.free(rc_path);1111        }1112        return streamEnv(io, machine, gpa, &.{ "nix", "shell", ref, "--command", "bash", "--rcfile", rc_path, "-i" }, base_env, ps1);1113    }1114    return streamEnv(io, machine, gpa, &.{ "nix", "shell", ref }, base_env, ps1);1115}11161117pub fn nixDevelop(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, run_cmd: ?[]const u8) !u8 {1118    if (run_cmd) |cmd| {1119        // sh -c so a multi-word command isn't treated as a single executable name.1120        return stream(io, machine, gpa, &.{ "nix", "develop", "--command", "sh", "-c", cmd });1121    }1122    return stream(io, machine, gpa, &.{ "nix", "develop" });1123}11241125pub 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 {1126    if (run_cmd) |cmd| {1127        // sh -c so a multi-word command isn't treated as a single executable name.1128        return stream(io, machine, gpa, &.{ "nix", "develop", "--command", "sh", "-c", cmd });1129    }1130    if (machine.local) {1131        const rc_path = try createInteractiveShellRc(gpa, io);1132        defer {1133            std.Io.Dir.deleteFile(.cwd(), io, rc_path) catch {};1134            gpa.free(rc_path);1135        }1136        return streamEnv(io, machine, gpa, &.{ "nix", "develop", "--command", "bash", "--rcfile", rc_path, "-i" }, base_env, "(nina: dev) -> ");1137    }1138    return streamEnv(io, machine, gpa, &.{ "nix", "develop" }, base_env, "(nina: dev) -> ");1139}11401141pub fn nixRepl(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1142    return stream(io, machine, gpa, &.{ "nix", "repl", "--expr", "import <nixpkgs> {}" });1143}11441145// --- Format ---11461147pub fn nixpkgsFmt(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, path: []const u8, check: bool) !u8 {1148    if (check) {1149        return stream(io, machine, gpa, &.{ "nixpkgs-fmt", "--check", path });1150    }1151    return stream(io, machine, gpa, &.{ "nixpkgs-fmt", path });1152}11531154// --- Info ---11551156pub fn systemInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1157    const r = try capture(gpa, io, machine, &.{"nixos-version"});1158    defer gpa.free(r.stderr);1159    if (r.exit_code != 0) {1160        gpa.free(r.stdout);1161        return error.ProcessFailed;1162    }1163    return r.stdout;1164}11651166pub fn kernelInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1167    const r = try capture(gpa, io, machine, &.{ "uname", "-r" });1168    defer gpa.free(r.stderr);1169    if (r.exit_code != 0) {1170        gpa.free(r.stdout);1171        return error.ProcessFailed;1172    }1173    return r.stdout;1174}11751176pub fn uptimeInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1177    const r = try capture(gpa, io, machine, &.{"uptime"});1178    defer gpa.free(r.stderr);1179    if (r.exit_code != 0) {1180        gpa.free(r.stdout);1181        return error.ProcessFailed;1182    }1183    return r.stdout;1184}11851186// --- Boot ---11871188pub fn bootEntries(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]types.BootEntry {1189    const r = try capture(gpa, io, machine, &.{ "bootctl", "list" });1190    defer gpa.free(r.stderr);1191    defer gpa.free(r.stdout);1192    if (r.exit_code != 0) return error.ProcessFailed;1193    return parseBootEntries(gpa, r.stdout);1194}11951196fn parseBootEntries(gpa: std.mem.Allocator, output_str: []const u8) ![]types.BootEntry {1197    var entries: std.ArrayList(types.BootEntry) = .empty;1198    var lines = std.mem.splitScalar(u8, output_str, '\n');1199    while (lines.next()) |line| {1200        const trimmed = std.mem.trim(u8, line, " \t\r");1201        if (std.mem.startsWith(u8, trimmed, "title:")) {1202            const title = std.mem.trim(u8, trimmed[6..], " \t");1203            const current = std.mem.indexOf(u8, title, "(current)") != null;1204            try entries.append(gpa, .{1205                .title = try gpa.dupe(u8, title),1206                .current = current,1207            });1208        }1209    }1210    return entries.toOwnedSlice(gpa);1211}12121213// --- Pkg info ---12141215fn pkgInstallable(gpa: std.mem.Allocator, pkg: []const u8) ![]u8 {1216    return std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{pkg});1217}12181219fn resolvePkgStorePath(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, installable: []const u8) ![]u8 {1220    const r = try capture(gpa, io, machine, &.{ "nix", "build", "--no-link", "--print-out-paths", installable });1221    defer gpa.free(r.stderr);1222    defer gpa.free(r.stdout);1223    if (r.exit_code != 0) return error.PackageNotFound;12241225    var lines = std.mem.tokenizeAny(u8, r.stdout, "\r\n");1226    const first_path = lines.next() orelse return error.PackageNotFound;1227    const store_path = std.mem.trim(u8, first_path, " \t");1228    if (store_path.len == 0) return error.PackageNotFound;1229    return gpa.dupe(u8, store_path);1230}12311232pub fn pkgWhy(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1233    const installable = try pkgInstallable(gpa, pkg);1234    defer gpa.free(installable);1235    const store_path = try resolvePkgStorePath(gpa, io, machine, installable);1236    defer gpa.free(store_path);1237    return stream(io, machine, gpa, &.{ "nix", "why-depends", "/run/current-system", store_path });1238}12391240pub fn pkgDeps(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1241    const installable = try pkgInstallable(gpa, pkg);1242    defer gpa.free(installable);1243    const store_path = try resolvePkgStorePath(gpa, io, machine, installable);1244    defer gpa.free(store_path);1245    return stream(io, machine, gpa, &.{ "nix-store", "--query", "--requisites", store_path });1246}12471248pub fn pkgSize(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, pkg: []const u8) ![]u8 {1249    const installable = try pkgInstallable(gpa, pkg);1250    defer gpa.free(installable);1251    const r = try capture(gpa, io, machine, &.{ "nix", "path-info", "-s", "--json", installable });1252    defer gpa.free(r.stderr);1253    defer gpa.free(r.stdout);1254    if (r.exit_code != 0) return error.ProcessFailed;12551256    const nar_size = try pathInfoNarSize(gpa, r.stdout);1257    return humanPkgSize(gpa, nar_size);1258}12591260pub fn pkgClosure(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1261    const installable = try pkgInstallable(gpa, pkg);1262    defer gpa.free(installable);1263    const store_path = try resolvePkgStorePath(gpa, io, machine, installable);1264    defer gpa.free(store_path);1265    return stream(io, machine, gpa, &.{ "nix", "path-info", "-rS", store_path });1266}12671268fn pathInfoNarSize(gpa: std.mem.Allocator, json_str: []const u8) !u64 {1269    var parsed = std.json.parseFromSlice(std.json.Value, gpa, json_str, .{}) catch return error.ProcessFailed;1270    defer parsed.deinit();1271    switch (parsed.value) {1272        .object => |obj| {1273            var it = obj.iterator();1274            while (it.next()) |entry| {1275                if (entry.value_ptr.* == .object) {1276                    if (entry.value_ptr.object.get("narSize")) |v| {1277                        if (v == .integer and v.integer >= 0) return @intCast(v.integer);1278                    }1279                }1280            }1281        },1282        .array => |arr| {1283            for (arr.items) |item| {1284                if (item == .object) {1285                    if (item.object.get("narSize")) |v| {1286                        if (v == .integer and v.integer >= 0) return @intCast(v.integer);1287                    }1288                }1289            }1290        },1291        else => {},1292    }1293    return error.ProcessFailed;1294}12951296fn humanPkgSize(gpa: std.mem.Allocator, bytes: u64) ![]u8 {1297    const units = [_][]const u8{ "B", "KiB", "MiB", "GiB", "TiB" };1298    var val: f64 = @floatFromInt(bytes);1299    var unit: usize = 0;1300    while (val >= 1024.0 and unit + 1 < units.len) : (unit += 1) val /= 1024.0;1301    if (unit == 0) return std.fmt.allocPrint(gpa, "{d} {s}", .{ bytes, units[0] });1302    return std.fmt.allocPrint(gpa, "{d:.1} {s}", .{ val, units[unit] });1303}13041305test "pathInfoNarSize parses object and array shapes" {1306    try std.testing.expectEqual(@as(u64, 1064629862), try pathInfoNarSize(std.testing.allocator,1307        \\{"/nix/store/abc-ffmpeg":{"narSize":1064629862}}1308    ));1309    try std.testing.expectEqual(@as(u64, 2048), try pathInfoNarSize(std.testing.allocator,1310        \\[{"path":"/nix/store/abc-pkg","narSize":2048}]1311    ));1312}13131314// --- Hash / Fetch ---13151316pub fn nixHash(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, path: []const u8) ![]u8 {1317    const r = try capture(gpa, io, machine, &.{ "nix", "hash", "path", path });1318    defer gpa.free(r.stderr);1319    if (r.exit_code != 0) {1320        gpa.free(r.stdout);1321        return error.ProcessFailed;1322    }1323    return r.stdout;1324}13251326pub fn nixFetch(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, url: []const u8) ![]u8 {1327    const r = try capture(gpa, io, machine, &.{ "nix-prefetch-url", url });1328    defer gpa.free(r.stderr);1329    if (r.exit_code != 0) {1330        gpa.free(r.stdout);1331        return error.ProcessFailed;1332    }1333    return r.stdout;1334}13351336// --- Pin ---13371338pub fn editFlakeLock(_: std.mem.Allocator, _: []const u8, _: []const u8) !void {1339    // Stub: full implementation would parse and edit flake.lock JSON1340    // The pin/unpin flow works via nix flake update which regenerates flake.lock1341}13421343pub fn openEditor(io: std.Io, gpa: std.mem.Allocator, editor: []const u8, path: []const u8, line: ?u32) !u8 {1344    if (line) |l| {1345        const line_arg = try std.fmt.allocPrint(gpa, "+{d}", .{l});1346        defer gpa.free(line_arg);1347        return stream(io, &types.Machine{}, gpa, &.{ editor, path, line_arg });1348    }1349    return stream(io, &types.Machine{}, gpa, &.{ editor, path });1350}13511352// Open a config directory as root with `sudo -E <editor> <path>` — `-E`1353// preserves the user's environment (PATH, TERM, EDITOR config) so the editor1354// behaves the same as it does unprivileged. Used by `nina edit --dir`.1355pub fn openEditorSudo(io: std.Io, gpa: std.mem.Allocator, editor: []const u8, path: []const u8) !u8 {1356    return stream(io, &types.Machine{}, gpa, &.{ "sudo", "-E", editor, path });1357}13581359pub fn diffClosures(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, a: u32, b: u32) !u8 {1360    const a_str = try std.fmt.allocPrint(gpa, "/nix/var/nix/profiles/system-{d}-link", .{a});1361    defer gpa.free(a_str);1362    const b_str = try std.fmt.allocPrint(gpa, "/nix/var/nix/profiles/system-{d}-link", .{b});1363    defer gpa.free(b_str);1364    // On a tty, the child's own color is fine — stream it directly.1365    if (output.colorEnabled()) {1366        return stream(io, machine, gpa, &.{ "nix", "store", "diff-closures", a_str, b_str });1367    }1368    // Piped/redirected: nix store diff-closures colorizes regardless of NO_COLOR,1369    // so we can't ask it to stop — capture its output and strip the ANSI ourselves.1370    const r = try capture(gpa, io, machine, &.{ "nix", "store", "diff-closures", a_str, b_str });1371    defer gpa.free(r.stdout);1372    defer gpa.free(r.stderr);1373    const cleaned = try stripAnsi(gpa, r.stdout);1374    defer gpa.free(cleaned);1375    output.raw(cleaned);1376    return r.exit_code;1377}13781379// Strip CSI escape sequences (ESC '[' ... final-byte) from text. Used to clean a1380// child process's color when it writes ANSI unconditionally.1381fn stripAnsi(gpa: std.mem.Allocator, input: []const u8) ![]u8 {1382    var out: std.ArrayList(u8) = .empty;1383    errdefer out.deinit(gpa);1384    var i: usize = 0;1385    while (i < input.len) {1386        if (input[i] == 0x1b and i + 1 < input.len and input[i + 1] == '[') {1387            i += 2;1388            while (i < input.len and !(input[i] >= 0x40 and input[i] <= 0x7e)) : (i += 1) {}1389            if (i < input.len) i += 1; // consume the final byte1390            continue;1391        }1392        try out.append(gpa, input[i]);1393        i += 1;1394    }1395    return out.toOwnedSlice(gpa);1396}13971398test "stripAnsi removes CSI color sequences" {1399    const cleaned = try stripAnsi(std.testing.allocator, "kepr: \x1b[31;1m13.1 KiB\x1b[0m");1400    defer std.testing.allocator.free(cleaned);1401    try std.testing.expectEqualStrings("kepr: 13.1 KiB", cleaned);1402}14031404// --- Doctor checks ---14051406pub fn runDoctorChecks(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]types.DoctorCheck {1407    var checks: std.ArrayList(types.DoctorCheck) = .empty;14081409    // Check nix daemon1410    {1411        const r = try capture(gpa, io, machine, &.{ "systemctl", "is-active", "nix-daemon" });1412        defer gpa.free(r.stdout);1413        defer gpa.free(r.stderr);1414        const active = std.mem.indexOf(u8, r.stdout, "active") != null;1415        try checks.append(gpa, .{ .name = "nix daemon", .status = if (active) .ok else .fail });1416    }14171418    // Check config syntax. Flake-aware like apply/upgrade: on a flake system a1419    // plain `nixos-rebuild dry-build` evaluates <nixpkgs/nixos> + <nixos-config>1420    // (channel style) and fails, so pass --flake when the config dir has one.1421    {1422        const argv: []const []const u8 = if (useFlakeFlag(gpa, io, machine))1423            &.{ "sudo", "nixos-rebuild", "dry-build", "--flake", machine.config_path }1424        else1425            &.{ "sudo", "nixos-rebuild", "dry-build" };1426        const r = try capture(gpa, io, machine, argv);1427        defer gpa.free(r.stdout);1428        defer gpa.free(r.stderr);1429        try checks.append(gpa, .{ .name = "config syntax", .status = if (r.exit_code == 0) .ok else .fail });1430    }14311432    // Check channel1433    {1434        const r = try capture(gpa, io, machine, &.{ "nix-channel", "--list" });1435        defer gpa.free(r.stdout);1436        defer gpa.free(r.stderr);1437        const has_channel = r.exit_code == 0 and r.stdout.len > 0;1438        try checks.append(gpa, .{ .name = "channel", .status = if (has_channel) .ok else .warn });1439    }14401441    return checks.toOwnedSlice(gpa);1442}14431444// --- Home Manager ---1445//1446// Home Manager has three usage modes. nina detects which one is in play before1447// any `home` command so it can either drive the standalone CLI or redirect the1448// user to `nina apply` (when HM is a NixOS/flake module activated by rebuild).14491450pub const HomeManagerMode = enum {1451    // home-manager binary on PATH — manages the user env on its own.1452    standalone,1453    // No binary, but a home.nix exists — HM is a NixOS/flake module rebuilt by1454    // nixos-rebuild. `nina home apply` redirects to `nina apply`.1455    module,1456    none,1457};14581459fn homeConfigDir(gpa: std.mem.Allocator, environ: *const std.process.Environ.Map) ?[]const u8 {1460    const home = environ.get("HOME") orelse return null;1461    return std.fmt.allocPrint(gpa, "{s}/.config/home-manager", .{home}) catch null;1462}14631464// Path to the standalone home.nix. Caller frees.1465pub fn homeNixPath(gpa: std.mem.Allocator, environ: *const std.process.Environ.Map) ?[]const u8 {1466    const dir = homeConfigDir(gpa, environ) orelse return null;1467    defer gpa.free(dir);1468    return std.fmt.allocPrint(gpa, "{s}/home.nix", .{dir}) catch null;1469}14701471pub fn pathExists(io: std.Io, path: []const u8) bool {1472    const f = std.Io.Dir.openFile(.cwd(), io, path, .{}) catch return false;1473    f.close(io);1474    return true;1475}14761477// `command -v <name>` — true if the binary resolves on PATH. Silent (captured),1478// unlike streamLocal which would inherit stdio.1479fn commandExists(gpa: std.mem.Allocator, io: std.Io, name: []const u8) bool {1480    var buf: [256]u8 = undefined;1481    const cmd = std.fmt.bufPrint(&buf, "command -v {s} >/dev/null 2>&1", .{name}) catch return false;1482    const r = std.process.run(gpa, io, .{ .argv = &.{ "sh", "-c", cmd } }) catch return false;1483    defer gpa.free(r.stdout);1484    defer gpa.free(r.stderr);1485    return switch (r.term) {1486        .exited => |code| code == 0,1487        else => false,1488    };1489}14901491pub fn detectHomeManager(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) HomeManagerMode {1492    if (commandExists(gpa, io, "home-manager")) return .standalone;1493    if (homeNixPath(gpa, environ)) |p| {1494        defer gpa.free(p);1495        if (pathExists(io, p)) return .module;1496    }1497    return .none;1498}14991500// The home-manager config dir when it holds a flake.nix (a flake-based home1501// config that `home-manager switch --flake` drives). null for a channel-based1502// config, which uses a plain `home-manager switch`. Caller frees.1503pub fn homeFlakeDir(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) ?[]const u8 {1504    const dir = homeConfigDir(gpa, environ) orelse return null;1505    const flake = std.fmt.allocPrint(gpa, "{s}/flake.nix", .{dir}) catch {1506        gpa.free(dir);1507        return null;1508    };1509    defer gpa.free(flake);1510    if (!pathExists(io, flake)) {1511        gpa.free(dir);1512        return null;1513    }1514    return dir;1515}15161517// Platform-specific home-manager attribute "<user>-<arch>-<os>" (e.g.1518// murazaki-x86_64-linux) — the homeConfigurations key many flakes derive from1519// ${USER}-${system}. arch/os come from uname on the local host (home commands1520// are local-only). Caller frees.1521pub fn homeManagerAttr(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, environ: *const std.process.Environ.Map) ![]const u8 {1522    const user = environ.get("USER") orelse "user";15231524    const arch_r = try capture(gpa, io, machine, &.{ "uname", "-m" });1525    defer gpa.free(arch_r.stdout);1526    defer gpa.free(arch_r.stderr);1527    if (arch_r.exit_code != 0) return error.ProcessFailed;1528    const arch = std.mem.trim(u8, arch_r.stdout, " \t\r\n");15291530    const os_r = try capture(gpa, io, machine, &.{ "uname", "-s" });1531    defer gpa.free(os_r.stdout);1532    defer gpa.free(os_r.stderr);1533    if (os_r.exit_code != 0) return error.ProcessFailed;1534    const os = try gpa.dupe(u8, std.mem.trim(u8, os_r.stdout, " \t\r\n"));1535    defer gpa.free(os);1536    for (os) |*ch| ch.* = std.ascii.toLower(ch.*);15371538    if (arch.len == 0 or os.len == 0) return error.ProcessFailed;1539    return std.fmt.allocPrint(gpa, "{s}-{s}-{s}", .{ user, arch, os });1540}15411542// Map a nixos-version string to the matching home-manager branch: an unstable1543// channel ("…pre…"/"unstable") → master; a stable release like1544// "25.05.20250115.abcdef (Warbler)" → release-25.05. Anything unparseable1545// falls back to master. Caller frees.1546fn homeBranchFromVersion(gpa: std.mem.Allocator, version_raw: []const u8) ![]const u8 {1547    const v = std.mem.trim(u8, version_raw, " \t\r\n");1548    if (std.mem.indexOf(u8, v, "pre") != null or1549        std.mem.indexOf(u8, v, "unstable") != null)1550        return gpa.dupe(u8, "master");15511552    const head = v[0 .. std.mem.indexOfScalar(u8, v, ' ') orelse v.len];1553    var it = std.mem.splitScalar(u8, head, '.');1554    const major = it.next() orelse "";1555    const minor = it.next() orelse "";1556    if (allDigits(major) and allDigits(minor))1557        return std.fmt.allocPrint(gpa, "release-{s}.{s}", .{ major, minor });15581559    return gpa.dupe(u8, "master");1560}15611562fn allDigits(s: []const u8) bool {1563    if (s.len == 0) return false;1564    for (s) |ch| if (!std.ascii.isDigit(ch)) return false;1565    return true;1566}15671568test "homeBranchFromVersion maps channels to HM branches" {1569    const a = std.testing.allocator;1570    const cases = [_]struct { in: []const u8, want: []const u8 }{1571        .{ .in = "25.05.20250115.abcdef (Warbler)", .want = "release-25.05" },1572        .{ .in = "24.11.20241201.deadbee (Vicuna)", .want = "release-24.11" },1573        .{ .in = "25.11pre-git", .want = "master" },1574        .{ .in = "25.05pre789012.abcdef (Warbler)", .want = "master" },1575        .{ .in = "nixos-unstable", .want = "master" },1576        .{ .in = "garbage", .want = "master" },1577    };1578    for (cases) |c| {1579        const got = try homeBranchFromVersion(a, c.in);1580        defer a.free(got);1581        try std.testing.expectEqualStrings(c.want, got);1582    }1583}15841585// The home-manager branch matching the running nixpkgs. Falls back to master1586// when nixos-version is unavailable (non-NixOS host). Caller frees.1587fn detectHomeManagerBranch(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]const u8 {1588    const r = capture(gpa, io, machine, &.{"nixos-version"}) catch1589        return gpa.dupe(u8, "master");1590    defer gpa.free(r.stdout);1591    defer gpa.free(r.stderr);1592    if (r.exit_code != 0) return gpa.dupe(u8, "master");1593    return homeBranchFromVersion(gpa, r.stdout);1594}15951596// `nix run home-manager/<branch> -- init [--switch] [dir]` — generates1597// flake.nix + home.nix (in dir, or ~/.config/home-manager by default),1598// activating immediately when switch_on_init is set.1599pub fn homeManagerInit(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, switch_on_init: bool, dir: ?[]const u8) !u8 {1600    const branch = try detectHomeManagerBranch(gpa, io, machine);1601    defer gpa.free(branch);1602    const flake_ref = try std.fmt.allocPrint(gpa, "home-manager/{s}", .{branch});1603    defer gpa.free(flake_ref);16041605    var argv: std.ArrayList([]const u8) = .empty;1606    defer argv.deinit(gpa);1607    try argv.appendSlice(gpa, &.{ "nix", "run", flake_ref, "--", "init" });1608    if (switch_on_init) try argv.append(gpa, "--switch");1609    if (dir) |d| try argv.append(gpa, d);16101611    return stream(io, machine, gpa, argv.items);1612}16131614pub fn homeManagerSwitch(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1615    output.flush();1616    const r = try capture(gpa, io, machine, &.{ "home-manager", "switch" });1617    defer gpa.free(r.stdout);1618    defer gpa.free(r.stderr);1619    errors.setBuildStderr(r.stderr);1620    return r.exit_code;1621}16221623// Outcome of a flake-based switch, so the caller can fall back to a less1624// specific attribute on a missing-attribute evaluation error — but never on a1625// genuine build failure.1626pub const SwitchOutcome = enum { ok, attr_missing, failed };16271628pub fn homeManagerSwitchFlake(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, flake_ref: []const u8) !SwitchOutcome {1629    output.flush();1630    const r = try capture(gpa, io, machine, &.{ "home-manager", "switch", "--flake", flake_ref });1631    defer gpa.free(r.stdout);1632    defer gpa.free(r.stderr);1633    if (r.exit_code == 0) return .ok;1634    // A flake that doesn't define this homeConfiguration fails during evaluation1635    // with "does not provide attribute" — surface that so the caller can retry a1636    // different attr rather than treating it as a build failure.1637    if (std.mem.indexOf(u8, r.stderr, "does not provide attribute") != null)1638        return .attr_missing;1639    errors.setBuildStderr(r.stderr);1640    return .failed;1641}16421643// home-manager has no system-profile rollback; it re-activates the previous1644// generation via `switch --rollback`.1645pub fn homeManagerRollback(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1646    output.flush();1647    const r = try capture(gpa, io, machine, &.{ "home-manager", "switch", "--rollback" });1648    defer gpa.free(r.stdout);1649    defer gpa.free(r.stderr);1650    errors.setBuildStderr(r.stderr);1651    return r.exit_code;1652}16531654// Build (and validate) the home config without activating it — used by `home1655// check` and `home apply --dry`. `home-manager build` drops a ./result symlink1656// in the cwd, so run it in a throwaway temp dir to avoid littering the directory1657// nina was invoked from.1658pub fn homeManagerBuild(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1659    output.flush();1660    const r = try capture(gpa, io, machine, &.{ "sh", "-c", "d=$(mktemp -d) && cd \"$d\" && home-manager build" });1661    defer gpa.free(r.stdout);1662    defer gpa.free(r.stderr);1663    errors.setBuildStderr(r.stderr);1664    return r.exit_code;1665}16661667pub fn homeGenerations(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1668    const r = try capture(gpa, io, machine, &.{ "home-manager", "generations" });1669    defer gpa.free(r.stderr);1670    if (r.exit_code != 0) {1671        gpa.free(r.stdout);1672        return error.ProcessFailed;1673    }1674    return r.stdout;1675}16761677// Store paths referenced by a home generation — used to list managed packages.1678pub fn homeGenerationReferences(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, gen_path: []const u8) ![]u8 {1679    const r = try capture(gpa, io, machine, &.{ "nix-store", "-q", "--references", gen_path });1680    defer gpa.free(r.stderr);1681    if (r.exit_code != 0) {1682        gpa.free(r.stdout);1683        return error.ProcessFailed;1684    }1685    return r.stdout;1686}16871688// diff-closures between two arbitrary store paths (home generations), mirroring1689// diffClosures' tty/piped color handling.1690pub fn diffClosuresPaths(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, a_path: []const u8, b_path: []const u8) !u8 {1691    if (output.colorEnabled()) {1692        return stream(io, machine, gpa, &.{ "nix", "store", "diff-closures", a_path, b_path });1693    }1694    const r = try capture(gpa, io, machine, &.{ "nix", "store", "diff-closures", a_path, b_path });1695    defer gpa.free(r.stdout);1696    defer gpa.free(r.stderr);1697    const cleaned = try stripAnsi(gpa, r.stdout);1698    defer gpa.free(cleaned);1699    output.raw(cleaned);1700    return r.exit_code;1701}17021703// --- Log ---17041705pub fn readNinaLog(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map, last: u32) ![]u8 {1706    const home = environ.get("HOME") orelse return error.FileNotFound;1707    const path = try std.fmt.allocPrint(gpa, "{s}/.nina.log", .{home});1708    defer gpa.free(path);1709    const content = std.Io.Dir.readFileAlloc(.cwd(), io, path, gpa, .unlimited) catch return error.FileNotFound;1710    if (last == 0) return content;17111712    // Collect non-empty lines, then keep only the final `last`. Slices point into1713    // `content`, so copy them out before freeing it.1714    var lines: std.ArrayList([]const u8) = .empty;1715    defer lines.deinit(gpa);1716    var it = std.mem.splitScalar(u8, content, '\n');1717    while (it.next()) |line| {1718        if (std.mem.trim(u8, line, " \t\r").len == 0) continue;1719        try lines.append(gpa, line);1720    }1721    if (lines.items.len <= last) return content;17221723    var out: std.ArrayList(u8) = .empty;1724    errdefer out.deinit(gpa);1725    for (lines.items[lines.items.len - last ..]) |line| {1726        try out.appendSlice(gpa, line);1727        try out.append(gpa, '\n');1728    }1729    gpa.free(content);1730    return out.toOwnedSlice(gpa);1731}17321733// nina is a one-shot process, so "did the last apply fail this session?" can't1734// live in memory — it's persisted as a ~/.nina-apply-failed flag, mirroring the1735// other ~/.nina-* state files. This lets a later successful apply earn the1736// excited kaomoji. mark sets it; take reads-and-clears so it fires exactly once.1737pub fn markApplyFailed(io: std.Io, environ: *const std.process.Environ.Map) void {1738    const home = environ.get("HOME") orelse return;1739    var buf: [512]u8 = undefined;1740    const path = std.fmt.bufPrint(&buf, "{s}/.nina-apply-failed", .{home}) catch return;1741    const file = std.Io.Dir.createFile(.cwd(), io, path, .{}) catch return;1742    file.close(io);1743}17441745pub fn takeApplyFailed(io: std.Io, environ: *const std.process.Environ.Map) bool {1746    const home = environ.get("HOME") orelse return false;1747    var buf: [512]u8 = undefined;1748    const path = std.fmt.bufPrint(&buf, "{s}/.nina-apply-failed", .{home}) catch return false;1749    if (std.Io.Dir.openFile(.cwd(), io, path, .{})) |f| {1750        f.close(io);1751        std.Io.Dir.deleteFile(.cwd(), io, path) catch {};1752        return true;1753    } else |_| {1754        return false;1755    }1756}17571758pub fn appendNinaLog(io: std.Io, environ: *const std.process.Environ.Map, entry: []const u8) void {1759    const home = environ.get("HOME") orelse return;1760    var path_buf: [512]u8 = undefined;1761    const path = std.fmt.bufPrint(&path_buf, "{s}/.nina.log", .{home}) catch return;1762    const file = std.Io.Dir.openFile(.cwd(), io, path, .{ .mode = .read_write }) catch1763        (std.Io.Dir.createFile(.cwd(), io, path, .{}) catch return);1764    defer file.close(io);1765    const size = file.length(io) catch 0;1766    file.writePositionalAll(io, entry, size) catch {};1767}17681769// --- Update helpers ---17701771// Fetch a URL with curl and return the response body. Caller must free.1772// error.NetworkError = DNS/connect failure; error.HttpError = non-2xx response.1773pub fn fetchUrl(gpa: std.mem.Allocator, io: std.Io, url: []const u8) ![]u8 {1774    const argv = [_][]const u8{1775        "curl", "-s", "-L", "-w", "\nHTTP_STATUS:%{http_code}", "-m", "30", "--", url,1776    };1777    const result = std.process.run(gpa, io, .{ .argv = &argv }) catch return error.NetworkError;1778    defer gpa.free(result.stderr);17791780    const marker = "\nHTTP_STATUS:";1781    const mark_idx = std.mem.lastIndexOf(u8, result.stdout, marker) orelse {1782        gpa.free(result.stdout);1783        return error.NetworkError;1784    };1785    const status_str = std.mem.trim(u8, result.stdout[mark_idx + marker.len ..], " \r\n");1786    const status = std.fmt.parseInt(u16, status_str, 10) catch {1787        gpa.free(result.stdout);1788        return error.NetworkError;1789    };1790    if (status == 0) { gpa.free(result.stdout); return error.NetworkError; }1791    if (status < 200 or status >= 300) { gpa.free(result.stdout); return error.HttpError; }1792    const body = gpa.dupe(u8, result.stdout[0..mark_idx]) catch |e| {1793        gpa.free(result.stdout);1794        return e;1795    };1796    gpa.free(result.stdout);1797    return body;1798}17991800// Download a URL to a temp file. Returns the temp path (caller must gpa.free).1801// The file is written to /tmp/nina-update-<pid> and left for the caller to use.1802pub fn downloadToTemp(gpa: std.mem.Allocator, io: std.Io, url: []const u8) ![]u8 {1803    const tmp_path = try gpa.dupe(u8, "/tmp/nina-update.bin");1804    errdefer gpa.free(tmp_path);18051806    var child = std.process.spawn(io, .{1807        .argv = &.{ "curl", "-fsSL", "-m", "300", "-o", tmp_path, "--", url },1808        .stdin = .close,1809        .stdout = .close,1810        .stderr = .inherit,1811    }) catch return error.NetworkError;1812    const term = child.wait(io) catch return error.NetworkError;1813    switch (term) {1814        .exited => |c| if (c != 0) return error.NetworkError,1815        else => return error.NetworkError,1816    }1817    return tmp_path;1818}18191820// Get the current executable path into buf. Returns slice of buf.1821pub fn selfExePath(io: std.Io, buf: *[std.Io.Dir.max_path_bytes]u8) ![]const u8 {1822    const len = try std.process.executablePath(io, buf);1823    return buf[0..len];1824}18251826// Verify blake3 of tmp_path against expected_hex (raw hex, no prefix), then1827// atomically install the binary to install_path. Errors: ChecksumMismatch,1828// AccessDenied (with error_info set), or underlying I/O errors.1829pub fn verifyAndInstall(gpa: std.mem.Allocator, io: std.Io, tmp_path: []const u8, expected_hex: []const u8, install_path: []const u8) !void {1830    const bytes = std.Io.Dir.readFileAlloc(.cwd(), io, tmp_path, gpa, .unlimited) catch {1831        errors.error_info.setMessage("downloaded file not found: {s}", .{tmp_path});1832        return error.FileNotFound;1833    };1834    defer gpa.free(bytes);18351836    var hasher = std.crypto.hash.Blake3.init(.{});1837    hasher.update(bytes);1838    var raw: [32]u8 = undefined;1839    hasher.final(&raw);1840    const hex = std.fmt.bytesToHex(raw, .lower);1841    if (!std.mem.eql(u8, &hex, expected_hex)) return error.ChecksumMismatch;18421843    var inst_tmp_buf: [std.Io.Dir.max_path_bytes + 8]u8 = undefined;1844    const inst_tmp = std.fmt.bufPrint(&inst_tmp_buf, "{s}.new", .{install_path}) catch1845        return error.NameTooLong;18461847    {1848        const f = std.Io.Dir.createFileAbsolute(io, inst_tmp, .{}) catch {1849            errors.error_info.setMessage("cannot write to {s}", .{install_path});1850            errors.error_info.setSuggestion("try: sudo nina update", .{});1851            return error.AccessDenied;1852        };1853        defer f.close(io);1854        f.writePositionalAll(io, bytes, 0) catch {1855            errors.error_info.setMessage("cannot write to {s}", .{install_path});1856            return error.AccessDenied;1857        };1858        try f.setPermissions(io, .fromMode(0o755));1859    }1860    errdefer std.Io.Dir.deleteFileAbsolute(io, inst_tmp) catch {};18611862    if (comptime builtin.os.tag == .macos) {1863        _ = captureLocal(gpa, io, &.{ "codesign", "-f", "-s", "-", inst_tmp }) catch {};1864    }18651866    std.Io.Dir.renameAbsolute(inst_tmp, install_path, io) catch |e| switch (e) {1867        error.AccessDenied => {1868            errors.error_info.setMessage("cannot replace {s}", .{install_path});1869            errors.error_info.setSuggestion("try: sudo nina update", .{});1870            return error.AccessDenied;1871        },1872        else => return e,1873    };1874}18751876// --- Nix feature setup ---18771878pub const NixFeatureStatus = struct {1879    nix_command: bool = false,1880    flakes: bool = false,18811882    pub fn allEnabled(self: NixFeatureStatus) bool {1883        return self.nix_command and self.flakes;1884    }1885};18861887fn scanConfFeatures(conf: []const u8, status: *NixFeatureStatus) void {1888    var lines = std.mem.splitScalar(u8, conf, '\n');1889    while (lines.next()) |line| {1890        const trimmed = std.mem.trim(u8, line, " \t");1891        if (!std.mem.startsWith(u8, trimmed, "experimental-features")) continue;1892        if (std.mem.indexOf(u8, trimmed, "nix-command") != null) status.nix_command = true;1893        if (std.mem.indexOf(u8, trimmed, "flakes") != null) status.flakes = true;1894    }1895}18961897pub fn checkNixFeatures(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) NixFeatureStatus {1898    var status = NixFeatureStatus{};18991900    if (std.Io.Dir.readFileAlloc(.cwd(), io, "/etc/nix/nix.conf", gpa, .unlimited) catch null) |conf| {1901        defer gpa.free(conf);1902        scanConfFeatures(conf, &status);1903    }19041905    if (environ.get("HOME")) |home| {1906        var buf: [512]u8 = undefined;1907        const path = std.fmt.bufPrint(&buf, "{s}/.config/nix/nix.conf", .{home}) catch return status;1908        if (std.Io.Dir.readFileAlloc(.cwd(), io, path, gpa, .unlimited) catch null) |conf| {1909            defer gpa.free(conf);1910            scanConfFeatures(conf, &status);1911        }1912    }19131914    return status;1915}19161917pub fn isNixOS(io: std.Io) bool {1918    const file = std.Io.Dir.openFile(.cwd(), io, "/etc/NIXOS", .{}) catch return false;1919    file.close(io);1920    return true;1921}19221923// Appends `experimental-features = nix-command flakes` to ~/.config/nix/nix.conf.1924// Returns the path written (caller must free).1925pub fn enableNixFeatures(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) ![]const u8 {1926    const home = environ.get("HOME") orelse {1927        errors.error_info.setMessage("HOME not set", .{});1928        return error.ConfigNotFound;1929    };19301931    const dir_path = try std.fmt.allocPrint(gpa, "{s}/.config/nix", .{home});1932    defer gpa.free(dir_path);1933    const file_path = try std.fmt.allocPrint(gpa, "{s}/.config/nix/nix.conf", .{home});1934    errdefer gpa.free(file_path);19351936    _ = captureLocal(gpa, io, &.{ "mkdir", "-p", dir_path }) catch {};19371938    const line = "experimental-features = nix-command flakes\n";1939    const file = std.Io.Dir.openFile(.cwd(), io, file_path, .{ .mode = .read_write }) catch1940        (std.Io.Dir.createFile(.cwd(), io, file_path, .{}) catch {1941        errors.error_info.setMessage("could not write {s}", .{file_path});1942        return error.FileNotFound;1943    });1944    defer file.close(io);19451946    const size = file.length(io) catch 0;1947    file.writePositionalAll(io, line, size) catch {1948        errors.error_info.setMessage("could not write {s}", .{file_path});1949        return error.FileNotFound;1950    };19511952    return file_path;1953}19541955// --- NixOS: declarative experimental-features ---1956//1957// On NixOS the permanent, declarative home for these flags is configuration.nix,1958// not ~/.config/nix/nix.conf. nina offers to add this one line and then leaves1959// the `nixos-rebuild switch` to the user.19601961pub const NIXOS_FEATURES_LINE =1962    "nix.settings.experimental-features = [ \"nix-command\" \"flakes\" ];";19631964// Best-effort, non-sudo check (configuration.nix is 0644 by default). Returns1965// false on any read error so the caller still offers to add the line.1966pub fn nixosConfigEnablesFeatures(gpa: std.mem.Allocator, io: std.Io, path: []const u8) bool {1967    const conf = std.Io.Dir.readFileAlloc(.cwd(), io, path, gpa, .unlimited) catch return false;1968    defer gpa.free(conf);1969    return std.mem.indexOf(u8, conf, "experimental-features") != null and1970        std.mem.indexOf(u8, conf, "nix-command") != null and1971        std.mem.indexOf(u8, conf, "flakes") != null;1972}19731974fn readMaybeSudo(gpa: std.mem.Allocator, io: std.Io, path: []const u8) ![]u8 {1975    if (std.Io.Dir.readFileAlloc(.cwd(), io, path, gpa, .unlimited) catch null) |data| return data;1976    return captureLocal(gpa, io, &.{ "sudo", "cat", path });1977}19781979// Insert NIXOS_FEATURES_LINE just before the final `}` of configuration.nix1980// (i.e. inside the top-level attribute set) and write it back via a single1981// `sudo cp`, which prompts for the password on the terminal. Returns an error1982// for the caller to fall back to printed manual instructions.1983pub fn appendFeaturesToNixosConfig(1984    gpa: std.mem.Allocator,1985    io: std.Io,1986    environ: *const std.process.Environ.Map,1987    path: []const u8,1988) !void {1989    const conf = readMaybeSudo(gpa, io, path) catch {1990        errors.error_info.setMessage("could not read {s}", .{path});1991        return error.ConfigNotFound;1992    };1993    defer gpa.free(conf);19941995    if (std.mem.indexOf(u8, conf, "experimental-features") != null) return; // already declared19961997    const brace = std.mem.lastIndexOfScalar(u8, conf, '}') orelse {1998        errors.error_info.setMessage("no closing brace in {s} — add the line by hand", .{path});1999        return error.MalformedConfig;2000    };20012002    const home = environ.get("HOME") orelse {2003        errors.error_info.setMessage("HOME not set", .{});2004        return error.ConfigNotFound;2005    };2006    const tmp_path = try std.fmt.allocPrint(gpa, "{s}/.nina-configuration.nix", .{home});2007    defer gpa.free(tmp_path);20082009    var buf: std.ArrayList(u8) = .empty;2010    defer buf.deinit(gpa);2011    try buf.appendSlice(gpa, conf[0..brace]);2012    if (brace == 0 or conf[brace - 1] != '\n') try buf.append(gpa, '\n');2013    try buf.appendSlice(gpa, "  # added by nina setup — flakes + the new nix CLI\n");2014    try buf.appendSlice(gpa, "  ");2015    try buf.appendSlice(gpa, NIXOS_FEATURES_LINE);2016    try buf.append(gpa, '\n');2017    try buf.appendSlice(gpa, conf[brace..]);20182019    const tmp = std.Io.Dir.createFile(.cwd(), io, tmp_path, .{}) catch {2020        errors.error_info.setMessage("could not write {s}", .{tmp_path});2021        return error.FileNotFound;2022    };2023    tmp.writePositionalAll(io, buf.items, 0) catch {2024        tmp.close(io);2025        std.Io.Dir.deleteFile(.cwd(), io, tmp_path) catch {};2026        errors.error_info.setMessage("could not write {s}", .{tmp_path});2027        return error.FileNotFound;2028    };2029    tmp.close(io);20302031    // Back up the existing config, then replace it — in one sudo call so the2032    // password is asked for at most once. Paths travel as positional args ($0,2033    // $1) to sidestep shell quoting.2034    const code = streamLocal(io, &.{2035        "sudo", "sh", "-c", "cp -- \"$0\" \"$0.nina-bak\" && cp -- \"$1\" \"$0\"", path, tmp_path,2036    }) catch {2037        std.Io.Dir.deleteFile(.cwd(), io, tmp_path) catch {};2038        errors.error_info.setMessage("could not write {s}", .{path});2039        return error.ProcessFailed;2040    };2041    std.Io.Dir.deleteFile(.cwd(), io, tmp_path) catch {};2042    if (code != 0) {2043        errors.error_info.setMessage("sudo cp into {s} failed", .{path});2044        return error.ProcessFailed;2045    }2046}