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}694695pub fn profileHasNina(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) bool {696    const name = profileNinaElement(gpa, io, machine) orelse return false;697    gpa.free(name);698    return true;699}700701// True when a nix store path belongs to the nina package. Store paths have the702// form /nix/store/<32-char-hash>-<pname>-<version>[/<subpath>]. We check that703// the 33 chars after /nix/store/ are the hash+dash, and the pname that follows704// is exactly "nina" (followed by "-" or end-of-component).705fn storePathIsNina(path: []const u8) bool {706    const prefix = "/nix/store/";707    if (!std.mem.startsWith(u8, path, prefix)) return false;708    const rel = path[prefix.len..];709    // The store entry name ends at the first "/" (if any sub-path follows).710    const entry = rel[0 .. std.mem.indexOf(u8, rel, "/") orelse rel.len];711    if (entry.len < 34) return false; // 32-char hash + dash + at least one char712    const pname_ver = entry[33..]; // skip hash + dash713    return std.mem.startsWith(u8, pname_ver, "nina-") or std.mem.eql(u8, pname_ver, "nina");714}715716// Pure parse of `nix profile list --json` for a nina element, returning its717// element name (the key to pass to `nix profile remove/upgrade`) or null.718// Newer nix (2.18+) keys elements by pname ("nina"). Older nix uses an array719// with an "attrPath" field. Tarball installs via the `default` output may use720// the key "default" instead of "nina"; we detect those via storePaths.721fn profileJsonNinaElement(gpa: std.mem.Allocator, js: []const u8) ?[]const u8 {722    var parsed = std.json.parseFromSlice(std.json.Value, gpa, js, .{}) catch return null;723    defer parsed.deinit();724    const root = parsed.value;725    if (root != .object) return null;726    const elements = root.object.get("elements") orelse return null;727    switch (elements) {728        .object => |obj| {729            // Fast path: exact "nina" key (nix 2.18+ with nixpkgs#nina install).730            if (obj.contains("nina")) return gpa.dupe(u8, "nina") catch null;731            // Fallback: scan storePaths. Handles tarball installs where the default732            // output is selected and nix names the element "default" (older nix) or733            // some other key derived from the attrPath rather than the pname.734            var it = obj.iterator();735            while (it.next()) |kv| {736                const val = kv.value_ptr.*;737                if (val != .object) continue;738                const sps = val.object.get("storePaths") orelse continue;739                if (sps != .array) continue;740                for (sps.array.items) |sp| {741                    if (sp == .string and storePathIsNina(sp.string))742                        return gpa.dupe(u8, kv.key_ptr.*) catch null;743                }744            }745            return null;746        },747        .array => |arr| {748            // Older nix array format. Element name is the last component of attrPath.749            for (arr.items) |el| {750                if (el != .object) continue;751                const ap = el.object.get("attrPath") orelse continue;752                if (ap != .string) continue;753                if (std.mem.eql(u8, ap.string, "nina") or754                    std.mem.endsWith(u8, ap.string, ".nina"))755                    return gpa.dupe(u8, "nina") catch null;756                // Tarball default-output install: attrPath ends in ".default" but757                // storePaths point to nina. Return "default" as the element name.758                const sps = el.object.get("storePaths") orelse continue;759                if (sps != .array) continue;760                for (sps.array.items) |sp| {761                    if (sp != .string) continue;762                    if (!storePathIsNina(sp.string)) continue;763                    const dot = std.mem.lastIndexOf(u8, ap.string, ".") orelse 0;764                    const el_name = if (dot > 0) ap.string[dot + 1 ..] else ap.string;765                    return gpa.dupe(u8, el_name) catch null;766                }767            }768            return null;769        },770        else => return null,771    }772}773774test "profileJsonNinaElement finds element name from profile JSON" {775    const a = std.testing.allocator;776777    // Newer nix: elements keyed by pname. "nina" key present.778    const named =779        \\{"elements":{"bat":{"storePaths":["/nix/store/h0000000000000000000000000000000-bat-0.26.1"]},780        \\"nina":{"attrPath":"packages.x86_64-linux.nina","storePaths":["/nix/store/a0000000000000000000000000000000-nina-3.0.15"]}},"version":3}781    ;782    const r1 = profileJsonNinaElement(a, named);783    defer if (r1) |n| a.free(n);784    try std.testing.expectEqualStrings("nina", r1.?);785786    // Tarball install via default output: element keyed as "default", storePath is nina.787    const default_key =788        \\{"elements":{"default":{"attrPath":"packages.x86_64-linux.default","storePaths":["/nix/store/w0000000000000000000000000000000-nina-3.0.16"]}},"version":3}789    ;790    const r2 = profileJsonNinaElement(a, default_key);791    defer if (r2) |n| a.free(n);792    try std.testing.expectEqualStrings("default", r2.?);793794    // Decoy: storePath of another package contains "nina" as a substring but is not nina.795    const decoy =796        \\{"elements":{"luminance":{"storePaths":["/nix/store/x0000000000000000000000000000000-luminance-nina-1.0"]}},"version":3}797    ;798    const r3 = profileJsonNinaElement(a, decoy);799    try std.testing.expectEqual(@as(?[]const u8, null), r3);800801    // Older nix array schema, attrPath ending in ".nina".802    const arr =803        \\{"elements":[{"attrPath":"legacyPackages.x86_64-linux.nina","storePaths":["/nix/store/a0000000000000000000000000000000-nina-3.0.15"]}],"version":2}804    ;805    const r4 = profileJsonNinaElement(a, arr);806    defer if (r4) |n| a.free(n);807    try std.testing.expectEqualStrings("nina", r4.?);808809    // Older nix array schema, tarball default-output install.810    const arr_default =811        \\{"elements":[{"attrPath":"packages.x86_64-linux.default","storePaths":["/nix/store/w0000000000000000000000000000000-nina-3.0.16"]}],"version":2}812    ;813    const r5 = profileJsonNinaElement(a, arr_default);814    defer if (r5) |n| a.free(n);815    try std.testing.expectEqualStrings("default", r5.?);816817    // Empty / malformed → null.818    try std.testing.expectEqual(@as(?[]const u8, null), profileJsonNinaElement(a, "{\"elements\":{},\"version\":3}"));819    try std.testing.expectEqual(@as(?[]const u8, null), profileJsonNinaElement(a, "not json"));820}821822// The store paths that make up the running system environment. Each reference is823// a <hash>-<name>-<version> path, so the caller can list system packages with824// versions — there is no cleaner per-package list for environment.systemPackages.825pub fn systemPackagePaths(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {826    const r = try capture(gpa, io, machine, &.{ "nix-store", "-q", "--references", "/run/current-system/sw" });827    defer gpa.free(r.stderr);828    if (r.exit_code != 0) {829        gpa.free(r.stdout);830        return error.ProcessFailed;831    }832    return r.stdout;833}834835pub fn profileUpgrade(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {836    return stream(io, machine, gpa, &.{ "nix", "profile", "upgrade", ".*" });837}838839// --- Store ---840841pub fn storeGc(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {842    return stream(io, machine, gpa, &.{ "sudo", "nix-collect-garbage" });843}844845pub fn storeVerify(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {846    return stream(io, machine, gpa, &.{ "nix", "store", "verify", "--all" });847}848849pub const SystemStatus = struct { size: []u8, age: []u8 };850851// One read-only pass for `nina status`: the current system's closure size (a852// single `path-info -S` of /run/current-system — fast, unlike -S over the whole853// store) and seconds since the system profile was last switched (its symlink854// mtime). Both are world-readable; no root needed.855const STATUS_SCRIPT =856    \\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} ))"857;858859pub fn systemStatus(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) SystemStatus {860    const unknown = SystemStatus{861        .size = gpa.dupe(u8, "") catch return .{ .size = "", .age = "" },862        .age = gpa.dupe(u8, "") catch return .{ .size = "", .age = "" },863    };864    const r = capture(gpa, io, machine, &.{ "sh", "-c", STATUS_SCRIPT }) catch return unknown;865    defer gpa.free(r.stdout);866    defer gpa.free(r.stderr);867    if (r.exit_code != 0) return unknown;868869    var it = std.mem.tokenizeAny(u8, r.stdout, " \t\n\r");870    const sz_str = it.next() orelse return unknown;871    const age_str = it.next() orelse return unknown;872    const bytes = std.fmt.parseInt(u64, sz_str, 10) catch 0;873    const age_secs = std.fmt.parseInt(u64, age_str, 10) catch 0;874875    gpa.free(unknown.size);876    gpa.free(unknown.age);877    return .{878        .size = humanSize(gpa, bytes) catch (gpa.dupe(u8, "") catch ""),879        .age = humanAgo(gpa, age_secs) catch (gpa.dupe(u8, "") catch ""),880    };881}882883// `systemctl is-system-running` -> "running" / "degraded" / "starting" ... A884// one-word health signal; exits non-zero when degraded, so we read stdout, not885// the code. Caller owns the returned slice.886pub fn systemRunningState(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {887    const r = capture(gpa, io, machine, &.{ "systemctl", "is-system-running" }) catch888        return gpa.dupe(u8, "unknown");889    defer gpa.free(r.stderr);890    const state = std.mem.trim(u8, r.stdout, " \t\n\r");891    const owned = try gpa.dupe(u8, if (state.len > 0) state else "unknown");892    gpa.free(r.stdout);893    return owned;894}895896fn humanAgo(gpa: std.mem.Allocator, secs: u64) ![]u8 {897    if (secs < 60) return std.fmt.allocPrint(gpa, "{d}s ago", .{secs});898    if (secs < 3600) return std.fmt.allocPrint(gpa, "{d}m ago", .{secs / 60});899    if (secs < 86400) return std.fmt.allocPrint(gpa, "{d}h ago", .{secs / 3600});900    return std.fmt.allocPrint(gpa, "{d}d ago", .{secs / 86400});901}902903pub fn storeRepair(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {904    return stream(io, machine, gpa, &.{ "sudo", "nix", "store", "repair", "--all" });905}906907pub fn storeInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) !types.StoreInfo {908    // `nix path-info -S --all` computes the CLOSURE size of every path — O(paths^2)909    // graph work that takes minutes on a real store (59k+ paths) and hangs the910    // command. We don't need closures: `--all --json` (no -S) carries each path's911    // own narSize, so one fast pass gives the path count and the summed store size.912    // `du -sh /nix/store` is just as slow on a big store, so it's gone too.913    // timeout-wrapped so a pathological store degrades to "?" instead of hanging.914    const pi = try capture(gpa, io, machine, &.{ "sh", "-c", "timeout 90 nix path-info --all --json 2>/dev/null" });915    defer gpa.free(pi.stdout);916    defer gpa.free(pi.stderr);917918    const scan = scanStoreJson(pi.stdout);919    const total_owned = try humanSize(gpa, scan.total_bytes);920921    return .{922        .total_size = total_owned,923        .live_paths = scan.count,924        .reclaimable_paths = 0,925    };926}927928const StoreScan = struct { count: u64, total_bytes: u64 };929930// One linear pass over `nix path-info --json`: each path object has exactly one931// "narSize": field, so counting them gives the true path count and summing the932// values gives the total store size — no per-path closure walk.933fn scanStoreJson(json_str: []const u8) StoreScan {934    const needle = "\"narSize\":";935    var count: u64 = 0;936    var total: u64 = 0;937    var i: usize = 0;938    while (std.mem.indexOfPos(u8, json_str, i, needle)) |pos| {939        var j = pos + needle.len;940        while (j < json_str.len and json_str[j] == ' ') : (j += 1) {}941        var val: u64 = 0;942        var any = false;943        while (j < json_str.len and json_str[j] >= '0' and json_str[j] <= '9') : (j += 1) {944            val = val * 10 + (json_str[j] - '0');945            any = true;946        }947        if (any) {948            count += 1;949            total += val;950        }951        i = j;952    }953    return .{ .count = count, .total_bytes = total };954}955956fn humanSize(gpa: std.mem.Allocator, bytes: u64) ![]u8 {957    const units = [_][]const u8{ "B", "KB", "MB", "GB", "TB" };958    var val: f64 = @floatFromInt(bytes);959    var unit: usize = 0;960    while (val >= 1024.0 and unit + 1 < units.len) : (unit += 1) val /= 1024.0;961    if (unit == 0) return std.fmt.allocPrint(gpa, "{d} {s}", .{ bytes, units[0] });962    return std.fmt.allocPrint(gpa, "{d:.1} {s}", .{ val, units[unit] });963}964965pub fn storePath(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, attr: []const u8) ![]u8 {966    // nixpkgs#<attr>, not .#<attr>: the package lives in nixpkgs (resolved via the967    // flake registry), not a flake in the current directory.968    const expr = try std.fmt.allocPrint(gpa, "nixpkgs#{s}.outPath", .{attr});969    defer gpa.free(expr);970    const r = try capture(gpa, io, machine, &.{ "nix", "eval", "--raw", expr });971    defer gpa.free(r.stderr);972    if (r.exit_code != 0) {973        gpa.free(r.stdout);974        return error.ProcessFailed;975    }976    return r.stdout;977}978979// --- Flake ---980981pub fn flakeUpdate(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, input: ?[]const u8) !u8 {982    if (input) |inp| {983        return stream(io, machine, gpa, &.{ "nix", "flake", "update", inp });984    }985    return stream(io, machine, gpa, &.{ "nix", "flake", "update" });986}987988// Update flake inputs for the flake living in `dir` (the config dir). `nix flake989// update` operates on the flake in the working directory, so we cd there first.990// Used by `nina upgrade` on a flake system in place of nix-channel --update.991pub fn flakeUpdateAt(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, dir: []const u8) !u8 {992    return stream(io, machine, gpa, &.{ "sh", "-c", "cd \"$0\" && nix flake update", dir });993}994995pub fn flakeCheck(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {996    return stream(io, machine, gpa, &.{ "nix", "flake", "check" });997}998999pub fn flakeInit(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1000    return stream(io, machine, gpa, &.{ "nix", "flake", "init" });1001}10021003pub fn flakeLock(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1004    return stream(io, machine, gpa, &.{ "nix", "flake", "lock" });1005}10061007pub fn flakeClone(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, url: []const u8) !u8 {1008    return stream(io, machine, gpa, &.{ "nix", "flake", "clone", url });1009}10101011pub fn flakeShow(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1012    const r = try capture(gpa, io, machine, &.{ "nix", "flake", "show", "--json" });1013    defer gpa.free(r.stderr);1014    if (r.exit_code != 0) {1015        gpa.free(r.stdout);1016        return error.ProcessFailed;1017    }1018    return r.stdout;1019}10201021// --- Build / Run / Develop ---10221023pub fn nixBuild(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, attr: ?[]const u8) !u8 {1024    if (attr) |a| {1025        const ref = try std.fmt.allocPrint(gpa, ".#{s}", .{a});1026        defer gpa.free(ref);1027        return stream(io, machine, gpa, &.{ "nix", "build", ref });1028    }1029    return stream(io, machine, gpa, &.{ "nix", "build" });1030}10311032pub fn nixRun(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1033    // nix run always gets --no-write-lock-file for remote URLs1034    const is_url = std.mem.startsWith(u8, pkg, "http://") or std.mem.startsWith(u8, pkg, "https://") or std.mem.startsWith(u8, pkg, "github:");1035    if (is_url) {1036        return stream(io, machine, gpa, &.{ "nix", "run", pkg, "--no-write-lock-file" });1037    }1038    // Already a flake ref (contains '#') → use as-is; bare name → default to nixpkgs#.1039    if (std.mem.indexOfScalar(u8, pkg, '#') != null) {1040        return stream(io, machine, gpa, &.{ "nix", "run", pkg });1041    }1042    const ref = try std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{pkg});1043    defer gpa.free(ref);1044    return stream(io, machine, gpa, &.{ "nix", "run", ref });1045}10461047pub fn nixShell(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1048    const ref = try std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{pkg});1049    defer gpa.free(ref);1050    return stream(io, machine, gpa, &.{ "nix", "shell", ref });1051}10521053pub fn nixShellPs1(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8, base_env: *const std.process.Environ.Map) !u8 {1054    const ref = try std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{pkg});1055    defer gpa.free(ref);1056    const ps1 = try std.fmt.allocPrint(gpa, "(nina: {s}) -> ", .{pkg});1057    defer gpa.free(ps1);1058    if (machine.local) {1059        const rc_path = try createInteractiveShellRc(gpa, io);1060        defer {1061            std.Io.Dir.deleteFile(.cwd(), io, rc_path) catch {};1062            gpa.free(rc_path);1063        }1064        return streamEnv(io, machine, gpa, &.{ "nix", "shell", ref, "--command", "bash", "--rcfile", rc_path, "-i" }, base_env, ps1);1065    }1066    return streamEnv(io, machine, gpa, &.{ "nix", "shell", ref }, base_env, ps1);1067}10681069pub fn nixDevelop(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, run_cmd: ?[]const u8) !u8 {1070    if (run_cmd) |cmd| {1071        // sh -c so a multi-word command isn't treated as a single executable name.1072        return stream(io, machine, gpa, &.{ "nix", "develop", "--command", "sh", "-c", cmd });1073    }1074    return stream(io, machine, gpa, &.{ "nix", "develop" });1075}10761077pub 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 {1078    if (run_cmd) |cmd| {1079        // sh -c so a multi-word command isn't treated as a single executable name.1080        return stream(io, machine, gpa, &.{ "nix", "develop", "--command", "sh", "-c", cmd });1081    }1082    if (machine.local) {1083        const rc_path = try createInteractiveShellRc(gpa, io);1084        defer {1085            std.Io.Dir.deleteFile(.cwd(), io, rc_path) catch {};1086            gpa.free(rc_path);1087        }1088        return streamEnv(io, machine, gpa, &.{ "nix", "develop", "--command", "bash", "--rcfile", rc_path, "-i" }, base_env, "(nina: dev) -> ");1089    }1090    return streamEnv(io, machine, gpa, &.{ "nix", "develop" }, base_env, "(nina: dev) -> ");1091}10921093pub fn nixRepl(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1094    return stream(io, machine, gpa, &.{ "nix", "repl", "--expr", "import <nixpkgs> {}" });1095}10961097// --- Format ---10981099pub fn nixpkgsFmt(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, path: []const u8, check: bool) !u8 {1100    if (check) {1101        return stream(io, machine, gpa, &.{ "nixpkgs-fmt", "--check", path });1102    }1103    return stream(io, machine, gpa, &.{ "nixpkgs-fmt", path });1104}11051106// --- Info ---11071108pub fn systemInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1109    const r = try capture(gpa, io, machine, &.{"nixos-version"});1110    defer gpa.free(r.stderr);1111    if (r.exit_code != 0) {1112        gpa.free(r.stdout);1113        return error.ProcessFailed;1114    }1115    return r.stdout;1116}11171118pub fn kernelInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1119    const r = try capture(gpa, io, machine, &.{ "uname", "-r" });1120    defer gpa.free(r.stderr);1121    if (r.exit_code != 0) {1122        gpa.free(r.stdout);1123        return error.ProcessFailed;1124    }1125    return r.stdout;1126}11271128pub fn uptimeInfo(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1129    const r = try capture(gpa, io, machine, &.{"uptime"});1130    defer gpa.free(r.stderr);1131    if (r.exit_code != 0) {1132        gpa.free(r.stdout);1133        return error.ProcessFailed;1134    }1135    return r.stdout;1136}11371138// --- Boot ---11391140pub fn bootEntries(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]types.BootEntry {1141    const r = try capture(gpa, io, machine, &.{ "bootctl", "list" });1142    defer gpa.free(r.stderr);1143    defer gpa.free(r.stdout);1144    if (r.exit_code != 0) return error.ProcessFailed;1145    return parseBootEntries(gpa, r.stdout);1146}11471148fn parseBootEntries(gpa: std.mem.Allocator, output_str: []const u8) ![]types.BootEntry {1149    var entries: std.ArrayList(types.BootEntry) = .empty;1150    var lines = std.mem.splitScalar(u8, output_str, '\n');1151    while (lines.next()) |line| {1152        const trimmed = std.mem.trim(u8, line, " \t\r");1153        if (std.mem.startsWith(u8, trimmed, "title:")) {1154            const title = std.mem.trim(u8, trimmed[6..], " \t");1155            const current = std.mem.indexOf(u8, title, "(current)") != null;1156            try entries.append(gpa, .{1157                .title = try gpa.dupe(u8, title),1158                .current = current,1159            });1160        }1161    }1162    return entries.toOwnedSlice(gpa);1163}11641165// --- Pkg info ---11661167fn pkgInstallable(gpa: std.mem.Allocator, pkg: []const u8) ![]u8 {1168    return std.fmt.allocPrint(gpa, "nixpkgs#{s}", .{pkg});1169}11701171fn resolvePkgStorePath(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, installable: []const u8) ![]u8 {1172    const r = try capture(gpa, io, machine, &.{ "nix", "build", "--no-link", "--print-out-paths", installable });1173    defer gpa.free(r.stderr);1174    defer gpa.free(r.stdout);1175    if (r.exit_code != 0) return error.PackageNotFound;11761177    var lines = std.mem.tokenizeAny(u8, r.stdout, "\r\n");1178    const first_path = lines.next() orelse return error.PackageNotFound;1179    const store_path = std.mem.trim(u8, first_path, " \t");1180    if (store_path.len == 0) return error.PackageNotFound;1181    return gpa.dupe(u8, store_path);1182}11831184pub fn pkgWhy(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1185    const installable = try pkgInstallable(gpa, pkg);1186    defer gpa.free(installable);1187    const store_path = try resolvePkgStorePath(gpa, io, machine, installable);1188    defer gpa.free(store_path);1189    return stream(io, machine, gpa, &.{ "nix", "why-depends", "/run/current-system", store_path });1190}11911192pub fn pkgDeps(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1193    const installable = try pkgInstallable(gpa, pkg);1194    defer gpa.free(installable);1195    const store_path = try resolvePkgStorePath(gpa, io, machine, installable);1196    defer gpa.free(store_path);1197    return stream(io, machine, gpa, &.{ "nix-store", "--query", "--requisites", store_path });1198}11991200pub fn pkgSize(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, pkg: []const u8) ![]u8 {1201    const installable = try pkgInstallable(gpa, pkg);1202    defer gpa.free(installable);1203    const r = try capture(gpa, io, machine, &.{ "nix", "path-info", "-s", "--json", installable });1204    defer gpa.free(r.stderr);1205    defer gpa.free(r.stdout);1206    if (r.exit_code != 0) return error.ProcessFailed;12071208    const nar_size = try pathInfoNarSize(gpa, r.stdout);1209    return humanPkgSize(gpa, nar_size);1210}12111212pub fn pkgClosure(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, pkg: []const u8) !u8 {1213    const installable = try pkgInstallable(gpa, pkg);1214    defer gpa.free(installable);1215    const store_path = try resolvePkgStorePath(gpa, io, machine, installable);1216    defer gpa.free(store_path);1217    return stream(io, machine, gpa, &.{ "nix", "path-info", "-rS", store_path });1218}12191220fn pathInfoNarSize(gpa: std.mem.Allocator, json_str: []const u8) !u64 {1221    var parsed = std.json.parseFromSlice(std.json.Value, gpa, json_str, .{}) catch return error.ProcessFailed;1222    defer parsed.deinit();1223    switch (parsed.value) {1224        .object => |obj| {1225            var it = obj.iterator();1226            while (it.next()) |entry| {1227                if (entry.value_ptr.* == .object) {1228                    if (entry.value_ptr.object.get("narSize")) |v| {1229                        if (v == .integer and v.integer >= 0) return @intCast(v.integer);1230                    }1231                }1232            }1233        },1234        .array => |arr| {1235            for (arr.items) |item| {1236                if (item == .object) {1237                    if (item.object.get("narSize")) |v| {1238                        if (v == .integer and v.integer >= 0) return @intCast(v.integer);1239                    }1240                }1241            }1242        },1243        else => {},1244    }1245    return error.ProcessFailed;1246}12471248fn humanPkgSize(gpa: std.mem.Allocator, bytes: u64) ![]u8 {1249    const units = [_][]const u8{ "B", "KiB", "MiB", "GiB", "TiB" };1250    var val: f64 = @floatFromInt(bytes);1251    var unit: usize = 0;1252    while (val >= 1024.0 and unit + 1 < units.len) : (unit += 1) val /= 1024.0;1253    if (unit == 0) return std.fmt.allocPrint(gpa, "{d} {s}", .{ bytes, units[0] });1254    return std.fmt.allocPrint(gpa, "{d:.1} {s}", .{ val, units[unit] });1255}12561257test "pathInfoNarSize parses object and array shapes" {1258    try std.testing.expectEqual(@as(u64, 1064629862), try pathInfoNarSize(std.testing.allocator,1259        \\{"/nix/store/abc-ffmpeg":{"narSize":1064629862}}1260    ));1261    try std.testing.expectEqual(@as(u64, 2048), try pathInfoNarSize(std.testing.allocator,1262        \\[{"path":"/nix/store/abc-pkg","narSize":2048}]1263    ));1264}12651266// --- Hash / Fetch ---12671268pub fn nixHash(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, path: []const u8) ![]u8 {1269    const r = try capture(gpa, io, machine, &.{ "nix", "hash", "path", path });1270    defer gpa.free(r.stderr);1271    if (r.exit_code != 0) {1272        gpa.free(r.stdout);1273        return error.ProcessFailed;1274    }1275    return r.stdout;1276}12771278pub fn nixFetch(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, url: []const u8) ![]u8 {1279    const r = try capture(gpa, io, machine, &.{ "nix-prefetch-url", url });1280    defer gpa.free(r.stderr);1281    if (r.exit_code != 0) {1282        gpa.free(r.stdout);1283        return error.ProcessFailed;1284    }1285    return r.stdout;1286}12871288// --- Pin ---12891290pub fn editFlakeLock(_: std.mem.Allocator, _: []const u8, _: []const u8) !void {1291    // Stub: full implementation would parse and edit flake.lock JSON1292    // The pin/unpin flow works via nix flake update which regenerates flake.lock1293}12941295pub fn openEditor(io: std.Io, gpa: std.mem.Allocator, editor: []const u8, path: []const u8, line: ?u32) !u8 {1296    if (line) |l| {1297        const line_arg = try std.fmt.allocPrint(gpa, "+{d}", .{l});1298        defer gpa.free(line_arg);1299        return stream(io, &types.Machine{}, gpa, &.{ editor, path, line_arg });1300    }1301    return stream(io, &types.Machine{}, gpa, &.{ editor, path });1302}13031304pub fn diffClosures(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, a: u32, b: u32) !u8 {1305    const a_str = try std.fmt.allocPrint(gpa, "/nix/var/nix/profiles/system-{d}-link", .{a});1306    defer gpa.free(a_str);1307    const b_str = try std.fmt.allocPrint(gpa, "/nix/var/nix/profiles/system-{d}-link", .{b});1308    defer gpa.free(b_str);1309    // On a tty, the child's own color is fine — stream it directly.1310    if (output.colorEnabled()) {1311        return stream(io, machine, gpa, &.{ "nix", "store", "diff-closures", a_str, b_str });1312    }1313    // Piped/redirected: nix store diff-closures colorizes regardless of NO_COLOR,1314    // so we can't ask it to stop — capture its output and strip the ANSI ourselves.1315    const r = try capture(gpa, io, machine, &.{ "nix", "store", "diff-closures", a_str, b_str });1316    defer gpa.free(r.stdout);1317    defer gpa.free(r.stderr);1318    const cleaned = try stripAnsi(gpa, r.stdout);1319    defer gpa.free(cleaned);1320    output.raw(cleaned);1321    return r.exit_code;1322}13231324// Strip CSI escape sequences (ESC '[' ... final-byte) from text. Used to clean a1325// child process's color when it writes ANSI unconditionally.1326fn stripAnsi(gpa: std.mem.Allocator, input: []const u8) ![]u8 {1327    var out: std.ArrayList(u8) = .empty;1328    errdefer out.deinit(gpa);1329    var i: usize = 0;1330    while (i < input.len) {1331        if (input[i] == 0x1b and i + 1 < input.len and input[i + 1] == '[') {1332            i += 2;1333            while (i < input.len and !(input[i] >= 0x40 and input[i] <= 0x7e)) : (i += 1) {}1334            if (i < input.len) i += 1; // consume the final byte1335            continue;1336        }1337        try out.append(gpa, input[i]);1338        i += 1;1339    }1340    return out.toOwnedSlice(gpa);1341}13421343test "stripAnsi removes CSI color sequences" {1344    const cleaned = try stripAnsi(std.testing.allocator, "kepr: \x1b[31;1m13.1 KiB\x1b[0m");1345    defer std.testing.allocator.free(cleaned);1346    try std.testing.expectEqualStrings("kepr: 13.1 KiB", cleaned);1347}13481349// --- Doctor checks ---13501351pub fn runDoctorChecks(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]types.DoctorCheck {1352    var checks: std.ArrayList(types.DoctorCheck) = .empty;13531354    // Check nix daemon1355    {1356        const r = try capture(gpa, io, machine, &.{ "systemctl", "is-active", "nix-daemon" });1357        defer gpa.free(r.stdout);1358        defer gpa.free(r.stderr);1359        const active = std.mem.indexOf(u8, r.stdout, "active") != null;1360        try checks.append(gpa, .{ .name = "nix daemon", .status = if (active) .ok else .fail });1361    }13621363    // Check config syntax. Flake-aware like apply/upgrade: on a flake system a1364    // plain `nixos-rebuild dry-build` evaluates <nixpkgs/nixos> + <nixos-config>1365    // (channel style) and fails, so pass --flake when the config dir has one.1366    {1367        const argv: []const []const u8 = if (useFlakeFlag(gpa, io, machine))1368            &.{ "sudo", "nixos-rebuild", "dry-build", "--flake", machine.config_path }1369        else1370            &.{ "sudo", "nixos-rebuild", "dry-build" };1371        const r = try capture(gpa, io, machine, argv);1372        defer gpa.free(r.stdout);1373        defer gpa.free(r.stderr);1374        try checks.append(gpa, .{ .name = "config syntax", .status = if (r.exit_code == 0) .ok else .fail });1375    }13761377    // Check channel1378    {1379        const r = try capture(gpa, io, machine, &.{ "nix-channel", "--list" });1380        defer gpa.free(r.stdout);1381        defer gpa.free(r.stderr);1382        const has_channel = r.exit_code == 0 and r.stdout.len > 0;1383        try checks.append(gpa, .{ .name = "channel", .status = if (has_channel) .ok else .warn });1384    }13851386    return checks.toOwnedSlice(gpa);1387}13881389// --- Home Manager ---1390//1391// Home Manager has three usage modes. nina detects which one is in play before1392// any `home` command so it can either drive the standalone CLI or redirect the1393// user to `nina apply` (when HM is a NixOS/flake module activated by rebuild).13941395pub const HomeManagerMode = enum {1396    // home-manager binary on PATH — manages the user env on its own.1397    standalone,1398    // No binary, but a home.nix exists — HM is a NixOS/flake module rebuilt by1399    // nixos-rebuild. `nina home apply` redirects to `nina apply`.1400    module,1401    none,1402};14031404fn homeConfigDir(gpa: std.mem.Allocator, environ: *const std.process.Environ.Map) ?[]const u8 {1405    const home = environ.get("HOME") orelse return null;1406    return std.fmt.allocPrint(gpa, "{s}/.config/home-manager", .{home}) catch null;1407}14081409// Path to the standalone home.nix. Caller frees.1410pub fn homeNixPath(gpa: std.mem.Allocator, environ: *const std.process.Environ.Map) ?[]const u8 {1411    const dir = homeConfigDir(gpa, environ) orelse return null;1412    defer gpa.free(dir);1413    return std.fmt.allocPrint(gpa, "{s}/home.nix", .{dir}) catch null;1414}14151416pub fn pathExists(io: std.Io, path: []const u8) bool {1417    const f = std.Io.Dir.openFile(.cwd(), io, path, .{}) catch return false;1418    f.close(io);1419    return true;1420}14211422// `command -v <name>` — true if the binary resolves on PATH. Silent (captured),1423// unlike streamLocal which would inherit stdio.1424fn commandExists(gpa: std.mem.Allocator, io: std.Io, name: []const u8) bool {1425    var buf: [256]u8 = undefined;1426    const cmd = std.fmt.bufPrint(&buf, "command -v {s} >/dev/null 2>&1", .{name}) catch return false;1427    const r = std.process.run(gpa, io, .{ .argv = &.{ "sh", "-c", cmd } }) catch return false;1428    defer gpa.free(r.stdout);1429    defer gpa.free(r.stderr);1430    return switch (r.term) {1431        .exited => |code| code == 0,1432        else => false,1433    };1434}14351436pub fn detectHomeManager(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) HomeManagerMode {1437    if (commandExists(gpa, io, "home-manager")) return .standalone;1438    if (homeNixPath(gpa, environ)) |p| {1439        defer gpa.free(p);1440        if (pathExists(io, p)) return .module;1441    }1442    return .none;1443}14441445// If the home-manager config dir holds a flake.nix, returns the flake ref1446// "<dir>#<user>" for `home-manager switch --flake`. Username comes from $USER.1447// Caller frees. null when there's no flake.nix (channel-based home config).1448pub fn homeFlakeRef(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) ?[]const u8 {1449    const dir = homeConfigDir(gpa, environ) orelse return null;1450    defer gpa.free(dir);1451    const flake = std.fmt.allocPrint(gpa, "{s}/flake.nix", .{dir}) catch return null;1452    defer gpa.free(flake);1453    if (!pathExists(io, flake)) return null;1454    const user = environ.get("USER") orelse "default";1455    return std.fmt.allocPrint(gpa, "{s}#{s}", .{ dir, user }) catch null;1456}14571458pub fn homeManagerSwitch(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1459    output.flush();1460    const r = try capture(gpa, io, machine, &.{ "home-manager", "switch" });1461    defer gpa.free(r.stdout);1462    defer gpa.free(r.stderr);1463    errors.setBuildStderr(r.stderr);1464    return r.exit_code;1465}14661467pub fn homeManagerSwitchFlake(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, flake_ref: []const u8) !u8 {1468    output.flush();1469    const r = try capture(gpa, io, machine, &.{ "home-manager", "switch", "--flake", flake_ref });1470    defer gpa.free(r.stdout);1471    defer gpa.free(r.stderr);1472    errors.setBuildStderr(r.stderr);1473    return r.exit_code;1474}14751476// home-manager has no system-profile rollback; it re-activates the previous1477// generation via `switch --rollback`.1478pub fn homeManagerRollback(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1479    output.flush();1480    const r = try capture(gpa, io, machine, &.{ "home-manager", "switch", "--rollback" });1481    defer gpa.free(r.stdout);1482    defer gpa.free(r.stderr);1483    errors.setBuildStderr(r.stderr);1484    return r.exit_code;1485}14861487// Build (and validate) the home config without activating it — used by `home1488// check` and `home apply --dry`. `home-manager build` drops a ./result symlink1489// in the cwd, so run it in a throwaway temp dir to avoid littering the directory1490// nina was invoked from.1491pub fn homeManagerBuild(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator) !u8 {1492    output.flush();1493    const r = try capture(gpa, io, machine, &.{ "sh", "-c", "d=$(mktemp -d) && cd \"$d\" && home-manager build" });1494    defer gpa.free(r.stdout);1495    defer gpa.free(r.stderr);1496    errors.setBuildStderr(r.stderr);1497    return r.exit_code;1498}14991500pub fn homeGenerations(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine) ![]u8 {1501    const r = try capture(gpa, io, machine, &.{ "home-manager", "generations" });1502    defer gpa.free(r.stderr);1503    if (r.exit_code != 0) {1504        gpa.free(r.stdout);1505        return error.ProcessFailed;1506    }1507    return r.stdout;1508}15091510// Store paths referenced by a home generation — used to list managed packages.1511pub fn homeGenerationReferences(gpa: std.mem.Allocator, io: std.Io, machine: *const types.Machine, gen_path: []const u8) ![]u8 {1512    const r = try capture(gpa, io, machine, &.{ "nix-store", "-q", "--references", gen_path });1513    defer gpa.free(r.stderr);1514    if (r.exit_code != 0) {1515        gpa.free(r.stdout);1516        return error.ProcessFailed;1517    }1518    return r.stdout;1519}15201521// diff-closures between two arbitrary store paths (home generations), mirroring1522// diffClosures' tty/piped color handling.1523pub fn diffClosuresPaths(io: std.Io, machine: *const types.Machine, gpa: std.mem.Allocator, a_path: []const u8, b_path: []const u8) !u8 {1524    if (output.colorEnabled()) {1525        return stream(io, machine, gpa, &.{ "nix", "store", "diff-closures", a_path, b_path });1526    }1527    const r = try capture(gpa, io, machine, &.{ "nix", "store", "diff-closures", a_path, b_path });1528    defer gpa.free(r.stdout);1529    defer gpa.free(r.stderr);1530    const cleaned = try stripAnsi(gpa, r.stdout);1531    defer gpa.free(cleaned);1532    output.raw(cleaned);1533    return r.exit_code;1534}15351536// --- Log ---15371538pub fn readNinaLog(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map, last: u32) ![]u8 {1539    const home = environ.get("HOME") orelse return error.FileNotFound;1540    const path = try std.fmt.allocPrint(gpa, "{s}/.nina.log", .{home});1541    defer gpa.free(path);1542    const content = std.Io.Dir.readFileAlloc(.cwd(), io, path, gpa, .unlimited) catch return error.FileNotFound;1543    if (last == 0) return content;15441545    // Collect non-empty lines, then keep only the final `last`. Slices point into1546    // `content`, so copy them out before freeing it.1547    var lines: std.ArrayList([]const u8) = .empty;1548    defer lines.deinit(gpa);1549    var it = std.mem.splitScalar(u8, content, '\n');1550    while (it.next()) |line| {1551        if (std.mem.trim(u8, line, " \t\r").len == 0) continue;1552        try lines.append(gpa, line);1553    }1554    if (lines.items.len <= last) return content;15551556    var out: std.ArrayList(u8) = .empty;1557    errdefer out.deinit(gpa);1558    for (lines.items[lines.items.len - last ..]) |line| {1559        try out.appendSlice(gpa, line);1560        try out.append(gpa, '\n');1561    }1562    gpa.free(content);1563    return out.toOwnedSlice(gpa);1564}15651566// nina is a one-shot process, so "did the last apply fail this session?" can't1567// live in memory — it's persisted as a ~/.nina-apply-failed flag, mirroring the1568// other ~/.nina-* state files. This lets a later successful apply earn the1569// excited kaomoji. mark sets it; take reads-and-clears so it fires exactly once.1570pub fn markApplyFailed(io: std.Io, environ: *const std.process.Environ.Map) void {1571    const home = environ.get("HOME") orelse return;1572    var buf: [512]u8 = undefined;1573    const path = std.fmt.bufPrint(&buf, "{s}/.nina-apply-failed", .{home}) catch return;1574    const file = std.Io.Dir.createFile(.cwd(), io, path, .{}) catch return;1575    file.close(io);1576}15771578pub fn takeApplyFailed(io: std.Io, environ: *const std.process.Environ.Map) bool {1579    const home = environ.get("HOME") orelse return false;1580    var buf: [512]u8 = undefined;1581    const path = std.fmt.bufPrint(&buf, "{s}/.nina-apply-failed", .{home}) catch return false;1582    if (std.Io.Dir.openFile(.cwd(), io, path, .{})) |f| {1583        f.close(io);1584        std.Io.Dir.deleteFile(.cwd(), io, path) catch {};1585        return true;1586    } else |_| {1587        return false;1588    }1589}15901591pub fn appendNinaLog(io: std.Io, environ: *const std.process.Environ.Map, entry: []const u8) void {1592    const home = environ.get("HOME") orelse return;1593    var path_buf: [512]u8 = undefined;1594    const path = std.fmt.bufPrint(&path_buf, "{s}/.nina.log", .{home}) catch return;1595    const file = std.Io.Dir.openFile(.cwd(), io, path, .{ .mode = .read_write }) catch1596        (std.Io.Dir.createFile(.cwd(), io, path, .{}) catch return);1597    defer file.close(io);1598    const size = file.length(io) catch 0;1599    file.writePositionalAll(io, entry, size) catch {};1600}16011602// --- Update helpers ---16031604// Fetch a URL with curl and return the response body. Caller must free.1605// error.NetworkError = DNS/connect failure; error.HttpError = non-2xx response.1606pub fn fetchUrl(gpa: std.mem.Allocator, io: std.Io, url: []const u8) ![]u8 {1607    const argv = [_][]const u8{1608        "curl", "-s", "-L", "-w", "\nHTTP_STATUS:%{http_code}", "-m", "30", "--", url,1609    };1610    const result = std.process.run(gpa, io, .{ .argv = &argv }) catch return error.NetworkError;1611    defer gpa.free(result.stderr);16121613    const marker = "\nHTTP_STATUS:";1614    const mark_idx = std.mem.lastIndexOf(u8, result.stdout, marker) orelse {1615        gpa.free(result.stdout);1616        return error.NetworkError;1617    };1618    const status_str = std.mem.trim(u8, result.stdout[mark_idx + marker.len ..], " \r\n");1619    const status = std.fmt.parseInt(u16, status_str, 10) catch {1620        gpa.free(result.stdout);1621        return error.NetworkError;1622    };1623    if (status == 0) { gpa.free(result.stdout); return error.NetworkError; }1624    if (status < 200 or status >= 300) { gpa.free(result.stdout); return error.HttpError; }1625    const body = gpa.dupe(u8, result.stdout[0..mark_idx]) catch |e| {1626        gpa.free(result.stdout);1627        return e;1628    };1629    gpa.free(result.stdout);1630    return body;1631}16321633// Download a URL to a temp file. Returns the temp path (caller must gpa.free).1634// The file is written to /tmp/nina-update-<pid> and left for the caller to use.1635pub fn downloadToTemp(gpa: std.mem.Allocator, io: std.Io, url: []const u8) ![]u8 {1636    const tmp_path = try gpa.dupe(u8, "/tmp/nina-update.bin");1637    errdefer gpa.free(tmp_path);16381639    var child = std.process.spawn(io, .{1640        .argv = &.{ "curl", "-fsSL", "-m", "300", "-o", tmp_path, "--", url },1641        .stdin = .close,1642        .stdout = .close,1643        .stderr = .inherit,1644    }) catch return error.NetworkError;1645    const term = child.wait(io) catch return error.NetworkError;1646    switch (term) {1647        .exited => |c| if (c != 0) return error.NetworkError,1648        else => return error.NetworkError,1649    }1650    return tmp_path;1651}16521653// Get the current executable path into buf. Returns slice of buf.1654pub fn selfExePath(io: std.Io, buf: *[std.Io.Dir.max_path_bytes]u8) ![]const u8 {1655    const len = try std.process.executablePath(io, buf);1656    return buf[0..len];1657}16581659// Verify blake3 of tmp_path against expected_hex (raw hex, no prefix), then1660// atomically install the binary to install_path. Errors: ChecksumMismatch,1661// AccessDenied (with error_info set), or underlying I/O errors.1662pub fn verifyAndInstall(gpa: std.mem.Allocator, io: std.Io, tmp_path: []const u8, expected_hex: []const u8, install_path: []const u8) !void {1663    const bytes = std.Io.Dir.readFileAlloc(.cwd(), io, tmp_path, gpa, .unlimited) catch {1664        errors.error_info.setMessage("downloaded file not found: {s}", .{tmp_path});1665        return error.FileNotFound;1666    };1667    defer gpa.free(bytes);16681669    var hasher = std.crypto.hash.Blake3.init(.{});1670    hasher.update(bytes);1671    var raw: [32]u8 = undefined;1672    hasher.final(&raw);1673    const hex = std.fmt.bytesToHex(raw, .lower);1674    if (!std.mem.eql(u8, &hex, expected_hex)) return error.ChecksumMismatch;16751676    var inst_tmp_buf: [std.Io.Dir.max_path_bytes + 8]u8 = undefined;1677    const inst_tmp = std.fmt.bufPrint(&inst_tmp_buf, "{s}.new", .{install_path}) catch1678        return error.NameTooLong;16791680    {1681        const f = std.Io.Dir.createFileAbsolute(io, inst_tmp, .{}) catch {1682            errors.error_info.setMessage("cannot write to {s}", .{install_path});1683            errors.error_info.setSuggestion("try: sudo nina update", .{});1684            return error.AccessDenied;1685        };1686        defer f.close(io);1687        f.writePositionalAll(io, bytes, 0) catch {1688            errors.error_info.setMessage("cannot write to {s}", .{install_path});1689            return error.AccessDenied;1690        };1691        try f.setPermissions(io, .fromMode(0o755));1692    }1693    errdefer std.Io.Dir.deleteFileAbsolute(io, inst_tmp) catch {};16941695    if (comptime builtin.os.tag == .macos) {1696        _ = captureLocal(gpa, io, &.{ "codesign", "-f", "-s", "-", inst_tmp }) catch {};1697    }16981699    std.Io.Dir.renameAbsolute(inst_tmp, install_path, io) catch |e| switch (e) {1700        error.AccessDenied => {1701            errors.error_info.setMessage("cannot replace {s}", .{install_path});1702            errors.error_info.setSuggestion("try: sudo nina update", .{});1703            return error.AccessDenied;1704        },1705        else => return e,1706    };1707}17081709// --- Nix feature setup ---17101711pub const NixFeatureStatus = struct {1712    nix_command: bool = false,1713    flakes: bool = false,17141715    pub fn allEnabled(self: NixFeatureStatus) bool {1716        return self.nix_command and self.flakes;1717    }1718};17191720fn scanConfFeatures(conf: []const u8, status: *NixFeatureStatus) void {1721    var lines = std.mem.splitScalar(u8, conf, '\n');1722    while (lines.next()) |line| {1723        const trimmed = std.mem.trim(u8, line, " \t");1724        if (!std.mem.startsWith(u8, trimmed, "experimental-features")) continue;1725        if (std.mem.indexOf(u8, trimmed, "nix-command") != null) status.nix_command = true;1726        if (std.mem.indexOf(u8, trimmed, "flakes") != null) status.flakes = true;1727    }1728}17291730pub fn checkNixFeatures(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) NixFeatureStatus {1731    var status = NixFeatureStatus{};17321733    if (std.Io.Dir.readFileAlloc(.cwd(), io, "/etc/nix/nix.conf", gpa, .unlimited) catch null) |conf| {1734        defer gpa.free(conf);1735        scanConfFeatures(conf, &status);1736    }17371738    if (environ.get("HOME")) |home| {1739        var buf: [512]u8 = undefined;1740        const path = std.fmt.bufPrint(&buf, "{s}/.config/nix/nix.conf", .{home}) catch return status;1741        if (std.Io.Dir.readFileAlloc(.cwd(), io, path, gpa, .unlimited) catch null) |conf| {1742            defer gpa.free(conf);1743            scanConfFeatures(conf, &status);1744        }1745    }17461747    return status;1748}17491750pub fn isNixOS(io: std.Io) bool {1751    const file = std.Io.Dir.openFile(.cwd(), io, "/etc/NIXOS", .{}) catch return false;1752    file.close(io);1753    return true;1754}17551756// Appends `experimental-features = nix-command flakes` to ~/.config/nix/nix.conf.1757// Returns the path written (caller must free).1758pub fn enableNixFeatures(gpa: std.mem.Allocator, io: std.Io, environ: *const std.process.Environ.Map) ![]const u8 {1759    const home = environ.get("HOME") orelse {1760        errors.error_info.setMessage("HOME not set", .{});1761        return error.ConfigNotFound;1762    };17631764    const dir_path = try std.fmt.allocPrint(gpa, "{s}/.config/nix", .{home});1765    defer gpa.free(dir_path);1766    const file_path = try std.fmt.allocPrint(gpa, "{s}/.config/nix/nix.conf", .{home});1767    errdefer gpa.free(file_path);17681769    _ = captureLocal(gpa, io, &.{ "mkdir", "-p", dir_path }) catch {};17701771    const line = "experimental-features = nix-command flakes\n";1772    const file = std.Io.Dir.openFile(.cwd(), io, file_path, .{ .mode = .read_write }) catch1773        (std.Io.Dir.createFile(.cwd(), io, file_path, .{}) catch {1774        errors.error_info.setMessage("could not write {s}", .{file_path});1775        return error.FileNotFound;1776    });1777    defer file.close(io);17781779    const size = file.length(io) catch 0;1780    file.writePositionalAll(io, line, size) catch {1781        errors.error_info.setMessage("could not write {s}", .{file_path});1782        return error.FileNotFound;1783    };17841785    return file_path;1786}17871788// --- NixOS: declarative experimental-features ---1789//1790// On NixOS the permanent, declarative home for these flags is configuration.nix,1791// not ~/.config/nix/nix.conf. nina offers to add this one line and then leaves1792// the `nixos-rebuild switch` to the user.17931794pub const NIXOS_FEATURES_LINE =1795    "nix.settings.experimental-features = [ \"nix-command\" \"flakes\" ];";17961797// Best-effort, non-sudo check (configuration.nix is 0644 by default). Returns1798// false on any read error so the caller still offers to add the line.1799pub fn nixosConfigEnablesFeatures(gpa: std.mem.Allocator, io: std.Io, path: []const u8) bool {1800    const conf = std.Io.Dir.readFileAlloc(.cwd(), io, path, gpa, .unlimited) catch return false;1801    defer gpa.free(conf);1802    return std.mem.indexOf(u8, conf, "experimental-features") != null and1803        std.mem.indexOf(u8, conf, "nix-command") != null and1804        std.mem.indexOf(u8, conf, "flakes") != null;1805}18061807fn readMaybeSudo(gpa: std.mem.Allocator, io: std.Io, path: []const u8) ![]u8 {1808    if (std.Io.Dir.readFileAlloc(.cwd(), io, path, gpa, .unlimited) catch null) |data| return data;1809    return captureLocal(gpa, io, &.{ "sudo", "cat", path });1810}18111812// Insert NIXOS_FEATURES_LINE just before the final `}` of configuration.nix1813// (i.e. inside the top-level attribute set) and write it back via a single1814// `sudo cp`, which prompts for the password on the terminal. Returns an error1815// for the caller to fall back to printed manual instructions.1816pub fn appendFeaturesToNixosConfig(1817    gpa: std.mem.Allocator,1818    io: std.Io,1819    environ: *const std.process.Environ.Map,1820    path: []const u8,1821) !void {1822    const conf = readMaybeSudo(gpa, io, path) catch {1823        errors.error_info.setMessage("could not read {s}", .{path});1824        return error.ConfigNotFound;1825    };1826    defer gpa.free(conf);18271828    if (std.mem.indexOf(u8, conf, "experimental-features") != null) return; // already declared18291830    const brace = std.mem.lastIndexOfScalar(u8, conf, '}') orelse {1831        errors.error_info.setMessage("no closing brace in {s} — add the line by hand", .{path});1832        return error.MalformedConfig;1833    };18341835    const home = environ.get("HOME") orelse {1836        errors.error_info.setMessage("HOME not set", .{});1837        return error.ConfigNotFound;1838    };1839    const tmp_path = try std.fmt.allocPrint(gpa, "{s}/.nina-configuration.nix", .{home});1840    defer gpa.free(tmp_path);18411842    var buf: std.ArrayList(u8) = .empty;1843    defer buf.deinit(gpa);1844    try buf.appendSlice(gpa, conf[0..brace]);1845    if (brace == 0 or conf[brace - 1] != '\n') try buf.append(gpa, '\n');1846    try buf.appendSlice(gpa, "  # added by nina setup — flakes + the new nix CLI\n");1847    try buf.appendSlice(gpa, "  ");1848    try buf.appendSlice(gpa, NIXOS_FEATURES_LINE);1849    try buf.append(gpa, '\n');1850    try buf.appendSlice(gpa, conf[brace..]);18511852    const tmp = std.Io.Dir.createFile(.cwd(), io, tmp_path, .{}) catch {1853        errors.error_info.setMessage("could not write {s}", .{tmp_path});1854        return error.FileNotFound;1855    };1856    tmp.writePositionalAll(io, buf.items, 0) catch {1857        tmp.close(io);1858        std.Io.Dir.deleteFile(.cwd(), io, tmp_path) catch {};1859        errors.error_info.setMessage("could not write {s}", .{tmp_path});1860        return error.FileNotFound;1861    };1862    tmp.close(io);18631864    // Back up the existing config, then replace it — in one sudo call so the1865    // password is asked for at most once. Paths travel as positional args ($0,1866    // $1) to sidestep shell quoting.1867    const code = streamLocal(io, &.{1868        "sudo", "sh", "-c", "cp -- \"$0\" \"$0.nina-bak\" && cp -- \"$1\" \"$0\"", path, tmp_path,1869    }) catch {1870        std.Io.Dir.deleteFile(.cwd(), io, tmp_path) catch {};1871        errors.error_info.setMessage("could not write {s}", .{path});1872        return error.ProcessFailed;1873    };1874    std.Io.Dir.deleteFile(.cwd(), io, tmp_path) catch {};1875    if (code != 0) {1876        errors.error_info.setMessage("sudo cp into {s} failed", .{path});1877        return error.ProcessFailed;1878    }1879}