| 1 | package sandbox |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | "io" |
| 7 | "os" |
| 8 | pathpkg "path" |
| 9 | "path/filepath" |
| 10 | "runtime" |
| 11 | "strings" |
| 12 | "time" |
| 13 | |
| 14 | "reasonix/internal/proc" |
| 15 | "reasonix/internal/secrets" |
| 16 | ) |
| 17 | |
| 18 | // psUTF8Prologue makes captured output UTF-8 rather than the console code page |
| 19 | // (CP936 on a Chinese Windows). Each assignment is guarded on its own: without a |
| 20 | // console, or under ConstrainedLanguage, the Console one throws, and that must |
| 21 | // neither skip $OutputEncoding nor print an error ahead of every command. |
| 22 | const psUTF8Prologue = "if($ExecutionContext.SessionState.LanguageMode -eq 'FullLanguage'){try{[Console]::OutputEncoding=[Text.UTF8Encoding]::new($false)}catch{};try{$OutputEncoding=[Text.UTF8Encoding]::new($false)}catch{}};" |
| 23 | |
| 24 | // psToolFileDefaults is for the agent's shell tool only: Windows PowerShell 5.1 |
| 25 | // writes '>' and Out-File as UTF-16LE, so there they default to UTF-8 (with the |
| 26 | // BOM 5.1 always adds). Hooks run the user's own scripts and keep its defaults. |
| 27 | const psToolFileDefaults = "if($PSVersionTable.PSVersion.Major -lt 6){try{$PSDefaultParameterValues['Out-File:Encoding']='utf8'}catch{}};" |
| 28 | |
| 29 | // PowerShellUTF8Script prepares a PowerShell script for captured execution, so |
| 30 | // PowerShell's own output and what it pipes to native programs are UTF-8. |
| 31 | func PowerShellUTF8Script(command string) string { |
| 32 | return psUTF8Prologue + command |
| 33 | } |
| 34 | |
| 35 | func powerShellToolScript(command string) string { |
| 36 | return psUTF8Prologue + psToolFileDefaults + command |
| 37 | } |
| 38 | |
| 39 | // ShellKind is the interpreter a shell command runs under. |
| 40 | type ShellKind int |
| 41 | |
| 42 | const ( |
| 43 | ShellBash ShellKind = iota |
| 44 | ShellPowerShell |
| 45 | ShellZsh |
| 46 | ShellSh |
| 47 | ) |
| 48 | |
| 49 | func (k ShellKind) String() string { |
| 50 | names := [...]string{"bash", "powershell", "zsh", "sh"} |
| 51 | if int(k) >= 0 && int(k) < len(names) { |
| 52 | return names[k] |
| 53 | } |
| 54 | return "bash" |
| 55 | } |
| 56 | |
| 57 | // IsPOSIX reports whether this interpreter accepts the POSIX-family command |
| 58 | // path used by the bash tool. zsh and sh are macOS fallbacks, not PowerShell. |
| 59 | func (k ShellKind) IsPOSIX() bool { return k != ShellPowerShell } |
| 60 | |
| 61 | // Shell is the resolved interpreter the bash tool executes commands with: a kind |
| 62 | // (so callers can adapt prompts) and the executable to invoke. |
| 63 | type Shell struct { |
| 64 | Kind ShellKind |
| 65 | Path string |
| 66 | } |
| 67 | |
| 68 | // ResolveShell picks the interpreter the shell tool runs commands under. With |
| 69 | // prefer "auto"/"" it favours Bash on POSIX and native PowerShell on Windows. |
| 70 | // prefer "bash" or |
| 71 | // "powershell"/"pwsh" forces that interpreter (path overrides the PATH lookup), |
| 72 | // warning to warn and falling back to auto-detection if the forced one is |
| 73 | // missing — so a typo or an uninstalled shell can never leave the tool broken. |
| 74 | // Discovery (candidate ordering, probing) is served by the process-wide shell |
| 75 | // inventory snapshot, so repeated calls share one probe pass for 30 seconds. |
| 76 | func ResolveShell(prefer, path string, warn io.Writer) Shell { |
| 77 | snap := defaultShellInventory.snapshot(runtime.GOOS, prefer, path) |
| 78 | return resolveShell(prefer, path, warn, snap.goos, snap.lookPath, snap.exists, snap.bashCands, snap.psCands, snap.probe, snap.isWSL) |
| 79 | } |
| 80 | |
| 81 | // ResolveExplicitBash preserves the dialect of user-authored POSIX hooks. |
| 82 | // Agent interpreter policy must not reinterpret an explicit hook command. |
| 83 | func ResolveExplicitBash(path string) (Shell, bool) { |
| 84 | snap := defaultShellInventory.snapshot(runtime.GOOS, "bash", path) |
| 85 | return resolveExplicitBash(snap, path) |
| 86 | } |
| 87 | |
| 88 | func resolveExplicitBash(snap *shellSnapshot, path string) (Shell, bool) { |
| 89 | path = configuredShellPath(snap.goos, ShellBash, path, snap.exists, snap.isWSL) |
| 90 | candidates := []string{path} |
| 91 | if found, err := snap.lookPath("bash"); err == nil { |
| 92 | candidates = append(candidates, found) |
| 93 | } |
| 94 | candidates = append(candidates, snap.bashCands...) |
| 95 | for _, candidate := range candidates { |
| 96 | if candidate != "" && !snap.isWSL(candidate) && snap.exists(candidate) && snap.probe(candidate) { |
| 97 | return Shell{Kind: ShellBash, Path: candidate}, true |
| 98 | } |
| 99 | } |
| 100 | return Shell{}, false |
| 101 | } |
| 102 | |
| 103 | // resolveShell is ResolveShell with its environment lookups injected — including |
| 104 | // the Git-for-Windows bash candidates, which derive from %ProgramFiles% and so |
| 105 | // are empty off Windows — so the decision table is deterministically testable on |
| 106 | // any host. |
| 107 | func resolveShell(prefer, path string, warn io.Writer, goos string, lookPath func(string) (string, error), exists func(string) bool, winBashCandidates []string, winPowerShellCandidates []string, probe func(string) bool, isWSL func(string) bool) Shell { |
| 108 | findPOSIX := func(name string, kind ShellKind) (Shell, bool) { |
| 109 | if p, err := lookPath(name); err == nil && !isWSL(p) && probe(p) { |
| 110 | return Shell{Kind: kind, Path: p}, true |
| 111 | } |
| 112 | if goos != "windows" { |
| 113 | for _, p := range []string{"/bin/" + name, "/usr/bin/" + name} { |
| 114 | if exists(p) && probe(p) { |
| 115 | return Shell{Kind: kind, Path: p}, true |
| 116 | } |
| 117 | } |
| 118 | } |
| 119 | return Shell{}, false |
| 120 | } |
| 121 | findBash := func() (Shell, bool) { |
| 122 | if sh, ok := findPOSIX("bash", ShellBash); ok { |
| 123 | return sh, true |
| 124 | } |
| 125 | for _, p := range winBashCandidates { |
| 126 | if exists(p) && probe(p) { |
| 127 | return Shell{Kind: ShellBash, Path: p}, true |
| 128 | } |
| 129 | } |
| 130 | return Shell{}, false |
| 131 | } |
| 132 | findPowerShell := func(order []string) (Shell, bool) { |
| 133 | for _, name := range order { |
| 134 | for _, p := range winPowerShellCandidates { |
| 135 | base := strings.ToLower(pathBase(p)) |
| 136 | if base != strings.ToLower(name) && strings.TrimSuffix(base, ".exe") != strings.ToLower(name) { |
| 137 | continue |
| 138 | } |
| 139 | if exists(p) { |
| 140 | return Shell{Kind: ShellPowerShell, Path: p}, true |
| 141 | } |
| 142 | } |
| 143 | if p, err := lookPath(name); err == nil { |
| 144 | return Shell{Kind: ShellPowerShell, Path: p}, true |
| 145 | } |
| 146 | } |
| 147 | return Shell{}, false |
| 148 | } |
| 149 | auto := func() Shell { return autoDetectedShell(goos, findBash, findPOSIX, findPowerShell) } |
| 150 | switch strings.ToLower(strings.TrimSpace(prefer)) { |
| 151 | case "", "auto": |
| 152 | return autoShellWithConfiguredPath(goos, path, exists, probe, isWSL, auto) |
| 153 | case "bash": |
| 154 | path = configuredShellPath(goos, ShellBash, path, exists, isWSL) |
| 155 | if path != "" && exists(path) && probe(path) { |
| 156 | return Shell{Kind: ShellBash, Path: path} |
| 157 | } |
| 158 | if sh, ok := findBash(); ok { |
| 159 | return sh |
| 160 | } |
| 161 | warnMissingShell(warn, prefer) |
| 162 | return auto() |
| 163 | case "powershell", "pwsh": |
| 164 | path = configuredShellPathForPreference(goos, prefer, path, exists, isWSL) |
| 165 | if path != "" && exists(path) { |
| 166 | return Shell{Kind: ShellPowerShell, Path: path} |
| 167 | } |
| 168 | order := []string{"pwsh", "powershell"} |
| 169 | if strings.EqualFold(strings.TrimSpace(prefer), "powershell") { |
| 170 | order = []string{"powershell", "pwsh"} |
| 171 | } |
| 172 | if sh, ok := findPowerShell(order); ok { |
| 173 | return sh |
| 174 | } |
| 175 | warnMissingShell(warn, prefer) |
| 176 | return auto() |
| 177 | default: |
| 178 | if warn != nil { |
| 179 | fmt.Fprintf(warn, "warning: [tools.shell] prefer=%q is not recognised (use auto/bash/powershell); using auto-detection\n", prefer) |
| 180 | } |
| 181 | return auto() |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | // Auto accepts native PowerShell paths on Windows. A persisted Git Bash path |
| 186 | // cannot silently opt an auto-configured host back into the MSYS runtime. |
| 187 | func autoShellWithConfiguredPath(goos, path string, exists, probe, isWSL func(string) bool, fallback func() Shell) Shell { |
| 188 | if goos == "windows" { |
| 189 | base := strings.TrimSuffix(strings.ToLower(pathBase(strings.TrimSpace(path))), ".exe") |
| 190 | if base == "pwsh" || base == "powershell" { |
| 191 | configured := configuredShellPath(goos, ShellPowerShell, path, exists, isWSL) |
| 192 | if configured != "" && exists(configured) { |
| 193 | return Shell{Kind: ShellPowerShell, Path: configured} |
| 194 | } |
| 195 | } |
| 196 | } |
| 197 | return fallback() |
| 198 | } |
| 199 | |
| 200 | func autoDetectedShell(goos string, findBash func() (Shell, bool), findPOSIX func(string, ShellKind) (Shell, bool), findPowerShell func([]string) (Shell, bool)) Shell { |
| 201 | if goos == "windows" { |
| 202 | if sh, ok := findPowerShell([]string{"pwsh", "powershell"}); ok { |
| 203 | return sh |
| 204 | } |
| 205 | // Keep the dialect native even when it is missing: launch preflight |
| 206 | // reports the missing dependency instead of silently selecting Bash. |
| 207 | return Shell{Kind: ShellPowerShell, Path: "pwsh"} |
| 208 | } |
| 209 | if sh, ok := findBash(); ok { |
| 210 | return sh |
| 211 | } |
| 212 | if goos == "darwin" { |
| 213 | for _, fallback := range []struct { |
| 214 | name string |
| 215 | kind ShellKind |
| 216 | }{{"zsh", ShellZsh}, {"sh", ShellSh}} { |
| 217 | if sh, ok := findPOSIX(fallback.name, fallback.kind); ok { |
| 218 | return sh |
| 219 | } |
| 220 | } |
| 221 | } |
| 222 | return Shell{Kind: ShellBash, Path: "bash"} |
| 223 | } |
| 224 | |
| 225 | func warnMissingShell(warn io.Writer, prefer string) { |
| 226 | if warn != nil { |
| 227 | fmt.Fprintf(warn, "warning: [tools.shell] prefer=%q but that shell was not found; using auto-detection\n", prefer) |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | // isWindowsWSLBash excludes the system WSL launcher and WindowsApps execution |
| 232 | // aliases. They can pass the health probe but run in a Linux distro, whose path |
| 233 | // and environment contracts do not match a native Windows workspace. |
| 234 | func isWindowsWSLBash(path string) bool { |
| 235 | if runtime.GOOS != "windows" || path == "" { |
| 236 | return false |
| 237 | } |
| 238 | win := os.Getenv("SystemRoot") |
| 239 | if win == "" { |
| 240 | win = os.Getenv("windir") |
| 241 | } |
| 242 | return isWindowsWSLBashPath(path, win) |
| 243 | } |
| 244 | |
| 245 | // Compare Windows paths independently of the host so alias exclusion is also |
| 246 | // covered on non-Windows builders. WindowsApps aliases can launch a working WSL |
| 247 | // distro and pass the health probe; successful execution does not make them Git Bash. |
| 248 | func isWindowsWSLBashPath(path, windowsRoot string) bool { |
| 249 | normalize := func(p string) string { |
| 250 | if p == "" { |
| 251 | return "" |
| 252 | } |
| 253 | p = strings.TrimPrefix(strings.ReplaceAll(p, `\`, "/"), "//?/") |
| 254 | return strings.TrimSuffix(strings.ToLower(pathpkg.Clean(p)), "/") |
| 255 | } |
| 256 | p := normalize(path) |
| 257 | if p == "" { |
| 258 | return false |
| 259 | } |
| 260 | if root := normalize(windowsRoot); root != "" && strings.HasPrefix(p, root+"/") { |
| 261 | return true |
| 262 | } |
| 263 | return strings.Contains(p, "/microsoft/windowsapps/") && strings.HasSuffix(p, "/bash.exe") |
| 264 | } |
| 265 | |
| 266 | // Windows ships a bash.exe launcher stub in %SystemRoot% that opens the WSL |
| 267 | // install prompt instead of running anything, so confirm bash actually works |
| 268 | // before trusting it. Timeout-bounded in case the stub blocks on that prompt. |
| 269 | func probeBash(path string) bool { |
| 270 | if runtime.GOOS != "windows" { |
| 271 | return true |
| 272 | } |
| 273 | ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second) |
| 274 | defer cancel() |
| 275 | cmd := proc.CommandContext(ctx, path, "-c", "true") |
| 276 | cmd.Env = secrets.ProcessEnv() |
| 277 | proc.HideWindow(cmd) |
| 278 | return cmd.Run() == nil |
| 279 | } |
| 280 | |
| 281 | func fileExists(p string) bool { |
| 282 | fi, err := os.Stat(p) |
| 283 | return err == nil && !fi.IsDir() |
| 284 | } |
| 285 | |
| 286 | func pathBase(p string) string { |
| 287 | if i := strings.LastIndexAny(p, `/\\`); i >= 0 { |
| 288 | return p[i+1:] |
| 289 | } |
| 290 | return p |
| 291 | } |
| 292 | |
| 293 | func pathDir(p string) string { |
| 294 | if i := strings.LastIndexAny(p, `/\`); i >= 0 { |
| 295 | return p[:i] |
| 296 | } |
| 297 | return "." |
| 298 | } |
| 299 | |
| 300 | // ConfiguredShellPathForPreference returns a configured executable only when |
| 301 | // it is compatible with the forced interpreter. The path remains persisted |
| 302 | // even when rejected here, so changing preferences never destroys the user's |
| 303 | // custom setting while runtime consumers avoid launching it with the wrong |
| 304 | // argv contract. |
| 305 | func ConfiguredShellPathForPreference(prefer, path string) string { |
| 306 | return configuredShellPathForPreference(runtime.GOOS, prefer, path, fileExists, isWindowsWSLBash) |
| 307 | } |
| 308 | |
| 309 | func configuredShellPathForPreference(goos, prefer, path string, exists func(string) bool, isWSL func(string) bool) string { |
| 310 | var kind ShellKind |
| 311 | switch strings.ToLower(strings.TrimSpace(prefer)) { |
| 312 | case "bash": |
| 313 | kind = ShellBash |
| 314 | case "powershell", "pwsh": |
| 315 | kind = ShellPowerShell |
| 316 | // Both versions share an argv dialect, but are distinct user choices. |
| 317 | // Preserve the stored path while ignoring a known opposite version. |
| 318 | base := strings.TrimSuffix(strings.ToLower(pathBase(strings.TrimSpace(path))), ".exe") |
| 319 | if goos == "windows" && (base == "powershell" || base == "pwsh") && !strings.EqualFold(base, strings.TrimSpace(prefer)) { |
| 320 | return "" |
| 321 | } |
| 322 | default: |
| 323 | return "" |
| 324 | } |
| 325 | return configuredShellPath(goos, kind, path, exists, isWSL) |
| 326 | } |
| 327 | |
| 328 | // configuredShellPath is the shared safety boundary for every consumer of |
| 329 | // [tools.shell].path. Known cross-kind executables are ignored instead of being |
| 330 | // relabeled, while unknown names remain available for intentional wrappers. |
| 331 | func configuredShellPath(goos string, kind ShellKind, path string, exists func(string) bool, isWSL func(string) bool) string { |
| 332 | path = strings.TrimSpace(path) |
| 333 | if path == "" { |
| 334 | return "" |
| 335 | } |
| 336 | if kind == ShellBash && goos == "windows" { |
| 337 | path = sanitizeWindowsBashPath(path, exists) |
| 338 | if isWSL != nil && isWSL(path) { |
| 339 | return "" |
| 340 | } |
| 341 | } |
| 342 | base := strings.TrimSuffix(strings.ToLower(pathBase(path)), ".exe") |
| 343 | switch kind { |
| 344 | case ShellBash: |
| 345 | if base == "git-bash" || base == "powershell" || base == "pwsh" || base == "zsh" || base == "sh" { |
| 346 | return "" |
| 347 | } |
| 348 | case ShellPowerShell: |
| 349 | if base == "bash" || base == "git-bash" || base == "zsh" || base == "sh" { |
| 350 | return "" |
| 351 | } |
| 352 | } |
| 353 | return path |
| 354 | } |
| 355 | |
| 356 | func sanitizeWindowsBashPath(path string, exists func(string) bool) string { |
| 357 | if path == "" { |
| 358 | return path |
| 359 | } |
| 360 | base := strings.ToLower(pathBase(path)) |
| 361 | if base == "git-bash.exe" || base == "git-bash" { |
| 362 | dir := pathDir(path) |
| 363 | sep := "/" |
| 364 | if strings.Contains(path, `\`) { |
| 365 | sep = `\` |
| 366 | } |
| 367 | parent := pathDir(dir) |
| 368 | for _, sub := range []string{ |
| 369 | dir + sep + "bin" + sep + "bash.exe", |
| 370 | dir + sep + "usr" + sep + "bin" + sep + "bash.exe", |
| 371 | parent + sep + "bin" + sep + "bash.exe", |
| 372 | parent + sep + "usr" + sep + "bin" + sep + "bash.exe", |
| 373 | } { |
| 374 | if exists(sub) { |
| 375 | return sub |
| 376 | } |
| 377 | } |
| 378 | } |
| 379 | return path |
| 380 | } |
| 381 | |
| 382 | // windowsPowerShellCandidates lists common PowerShell executables that are not |
| 383 | // always present on PATH: PowerShell 7's MSI path, then the Store's execution alias. |
| 384 | func windowsPowerShellCandidates() []string { |
| 385 | var roots []string |
| 386 | for _, env := range []string{"ProgramFiles", "ProgramW6432", "ProgramFiles(x86)"} { |
| 387 | if v := os.Getenv(env); v != "" { |
| 388 | roots = append(roots, v) |
| 389 | } |
| 390 | } |
| 391 | var out []string |
| 392 | for _, r := range roots { |
| 393 | out = append(out, filepath.Join(r, "PowerShell", "7", "pwsh.exe")) |
| 394 | } |
| 395 | if v := os.Getenv("LOCALAPPDATA"); v != "" { |
| 396 | out = append(out, filepath.Join(v, "Microsoft", "WindowsApps", "pwsh.exe")) |
| 397 | } |
| 398 | if v := os.Getenv("SystemRoot"); v != "" { |
| 399 | out = append(out, filepath.Join(v, "System32", "WindowsPowerShell", "v1.0", "powershell.exe")) |
| 400 | } else if v := os.Getenv("windir"); v != "" { |
| 401 | out = append(out, filepath.Join(v, "System32", "WindowsPowerShell", "v1.0", "powershell.exe")) |
| 402 | } |
| 403 | return out |
| 404 | } |
| 405 | |
| 406 | // normalizeNullRedirects rewrites null-device redirect aliases to sink |
| 407 | // ("/dev/null" for bash, "$null" for PowerShell), so permission-approved |
| 408 | // null-sink commands discard output under the resolved shell. It handles |
| 409 | // cmd.exe-style `nul`, PowerShell `$null`, and POSIX `/dev/null` while avoiding |
| 410 | // quoted/escaped text. |
| 411 | func normalizeNullRedirects(command, sink string) string { |
| 412 | var ( |
| 413 | out strings.Builder |
| 414 | quote byte |
| 415 | ) |
| 416 | write := func(c byte) { |
| 417 | out.WriteByte(c) |
| 418 | } |
| 419 | for i := 0; i < len(command); { |
| 420 | c := command[i] |
| 421 | if quote != 0 { |
| 422 | write(c) |
| 423 | i++ |
| 424 | if c == '\\' && quote == '"' && i < len(command) { |
| 425 | write(command[i]) |
| 426 | i++ |
| 427 | continue |
| 428 | } |
| 429 | if c == '`' && i < len(command) { |
| 430 | write(command[i]) |
| 431 | i++ |
| 432 | continue |
| 433 | } |
| 434 | if c == quote { |
| 435 | quote = 0 |
| 436 | } |
| 437 | continue |
| 438 | } |
| 439 | switch c { |
| 440 | case '\'', '"': |
| 441 | quote = c |
| 442 | write(c) |
| 443 | i++ |
| 444 | case '\\', '`': |
| 445 | write(c) |
| 446 | i++ |
| 447 | if i < len(command) { |
| 448 | write(command[i]) |
| 449 | i++ |
| 450 | } |
| 451 | default: |
| 452 | if replacement, next, ok := consumeNullRedirect(command, i, sink); ok { |
| 453 | out.WriteString(replacement) |
| 454 | i = next |
| 455 | continue |
| 456 | } |
| 457 | write(c) |
| 458 | i++ |
| 459 | } |
| 460 | } |
| 461 | return out.String() |
| 462 | } |
| 463 | |
| 464 | func consumeNullRedirect(s string, start int, sink string) (string, int, bool) { |
| 465 | i := start |
| 466 | if i >= len(s) { |
| 467 | return "", start, false |
| 468 | } |
| 469 | if s[i] == '&' { |
| 470 | i++ |
| 471 | if i < len(s) && s[i] == '>' { |
| 472 | i++ |
| 473 | if i < len(s) && s[i] == '>' { |
| 474 | i++ |
| 475 | } |
| 476 | } else { |
| 477 | return "", start, false |
| 478 | } |
| 479 | } else { |
| 480 | for i < len(s) && s[i] >= '0' && s[i] <= '9' { |
| 481 | i++ |
| 482 | } |
| 483 | if i >= len(s) || s[i] != '>' { |
| 484 | return "", start, false |
| 485 | } |
| 486 | i++ |
| 487 | if i < len(s) && s[i] == '>' { |
| 488 | i++ |
| 489 | } |
| 490 | } |
| 491 | opEnd := i |
| 492 | for i < len(s) && (s[i] == ' ' || s[i] == '\t') { |
| 493 | i++ |
| 494 | } |
| 495 | next, ok := consumeNullSink(s, i) |
| 496 | if !ok { |
| 497 | return "", start, false |
| 498 | } |
| 499 | return s[start:opEnd] + sink, next, true |
| 500 | } |
| 501 | |
| 502 | func consumeNullSink(s string, i int) (int, bool) { |
| 503 | for _, sink := range []string{"/dev/null", "$null", "nul"} { |
| 504 | if i+len(sink) > len(s) { |
| 505 | continue |
| 506 | } |
| 507 | got := s[i : i+len(sink)] |
| 508 | if sink == "/dev/null" { |
| 509 | if got != sink { |
| 510 | continue |
| 511 | } |
| 512 | } else if !strings.EqualFold(got, sink) { |
| 513 | continue |
| 514 | } |
| 515 | next := i + len(sink) |
| 516 | if next < len(s) && !isNullRedirectWordEnd(s[next]) { |
| 517 | return next, false |
| 518 | } |
| 519 | return next, true |
| 520 | } |
| 521 | return i, false |
| 522 | } |
| 523 | |
| 524 | func isNullRedirectWordEnd(c byte) bool { |
| 525 | return c == ' ' || c == '\t' || c == '\n' || c == '\r' || strings.ContainsRune(";&|<>)]", rune(c)) |
| 526 | } |
| 527 | |
| 528 | // argv builds the exec argv that runs command under this shell. |
| 529 | func (s Shell) argv(command string) []string { |
| 530 | path := s.Path |
| 531 | if path == "" { |
| 532 | path = s.Kind.String() |
| 533 | } |
| 534 | if s.Kind == ShellPowerShell { |
| 535 | return []string{path, "-NoProfile", "-NonInteractive", "-Command", powerShellToolScript(normalizeNullRedirects(command, "$null"))} |
| 536 | } |
| 537 | return []string{path, "-c", normalizeNullRedirects(command, "/dev/null")} |
| 538 | } |
| 539 | |
| 540 | // SupportsChaining reports whether the shell parses '&&' / '||'. bash does; |
| 541 | // Windows PowerShell 5.1 (powershell.exe) does not — only PowerShell 7+ (pwsh). |
| 542 | func (s Shell) SupportsChaining() bool { |
| 543 | if s.Kind != ShellPowerShell { |
| 544 | return true |
| 545 | } |
| 546 | base := strings.ToLower(pathBase(s.Path)) |
| 547 | return base == "pwsh" || base == "pwsh.exe" |
| 548 | } |
| 549 |