| 1 | // Copyright 2015 The Go Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | // Toolstash provides a way to save, run, and restore a known good copy of the Go toolchain |
| 6 | // and to compare the object files generated by two toolchains. |
| 7 | // |
| 8 | // Usage: |
| 9 | // |
| 10 | // toolstash [-n] [-v] save [tool...] |
| 11 | // toolstash [-n] [-v] restore [tool...] |
| 12 | // toolstash [-n] [-v] [-t] go run x.go |
| 13 | // toolstash [-n] [-v] [-t] [-cmp] compile x.go |
| 14 | // |
| 15 | // The toolstash command manages a “stashed” copy of the Go toolchain |
| 16 | // kept in $GOROOT/pkg/toolstash. In this case, the toolchain means the |
| 17 | // tools available with the 'go tool' command as well as the go, godoc, and gofmt |
| 18 | // binaries. |
| 19 | // |
| 20 | // The command “toolstash save”, typically run when the toolchain is known to be working, |
| 21 | // copies the toolchain from its installed location to the toolstash directory. |
| 22 | // Its inverse, “toolchain restore”, typically run when the toolchain is known to be broken, |
| 23 | // copies the toolchain from the toolstash directory back to the installed locations. |
| 24 | // If additional arguments are given, the save or restore applies only to the named tools. |
| 25 | // Otherwise, it applies to all tools. |
| 26 | // |
| 27 | // Otherwise, toolstash's arguments should be a command line beginning with the |
| 28 | // name of a toolchain binary, which may be a short name like compile or a complete path |
| 29 | // to an installed binary. Toolstash runs the command line using the stashed |
| 30 | // copy of the binary instead of the installed one. |
| 31 | // |
| 32 | // The -n flag causes toolstash to print the commands that would be executed |
| 33 | // but not execute them. The combination -n -cmp shows the two commands |
| 34 | // that would be compared and then exits successfully. A real -cmp run might |
| 35 | // run additional commands for diagnosis of an output mismatch. |
| 36 | // |
| 37 | // The -v flag causes toolstash to print the commands being executed. |
| 38 | // |
| 39 | // The -t flag causes toolstash to print the time elapsed during while the |
| 40 | // command ran. |
| 41 | // |
| 42 | // # Comparing |
| 43 | // |
| 44 | // The -cmp flag causes toolstash to run both the installed and the stashed |
| 45 | // copy of an assembler or compiler and check that they produce identical |
| 46 | // object files. If not, toolstash reports the mismatch and exits with a failure status. |
| 47 | // As part of reporting the mismatch, toolstash reinvokes the command with |
| 48 | // the -S=2 flag and identifies the first divergence in the assembly output. |
| 49 | // If the command is a Go compiler, toolstash also determines whether the |
| 50 | // difference is triggered by optimization passes. |
| 51 | // On failure, toolstash leaves additional information in files named |
| 52 | // similarly to the default output file. If the compilation would normally |
| 53 | // produce a file x.6, the output from the stashed tool is left in x.6.stash |
| 54 | // and the debugging traces are left in x.6.log and x.6.stash.log. |
| 55 | // |
| 56 | // The -cmp flag is a no-op when the command line is not invoking an |
| 57 | // assembler or compiler. |
| 58 | // |
| 59 | // For example, when working on code cleanup that should not affect |
| 60 | // compiler output, toolstash can be used to compare the old and new |
| 61 | // compiler output: |
| 62 | // |
| 63 | // toolstash save |
| 64 | // <edit compiler sources> |
| 65 | // go tool dist install cmd/compile # install compiler only |
| 66 | // toolstash -cmp compile x.go |
| 67 | // |
| 68 | // # Go Command Integration |
| 69 | // |
| 70 | // The go command accepts a -toolexec flag that specifies a program |
| 71 | // to use to run the build tools. |
| 72 | // |
| 73 | // To build with the stashed tools: |
| 74 | // |
| 75 | // go build -toolexec toolstash x.go |
| 76 | // |
| 77 | // To build with the stashed go command and the stashed tools: |
| 78 | // |
| 79 | // toolstash go build -toolexec toolstash x.go |
| 80 | // |
| 81 | // To verify that code cleanup in the compilers does not make any |
| 82 | // changes to the objects being generated for the entire tree: |
| 83 | // |
| 84 | // # Build working tree and save tools. |
| 85 | // ./make.bash |
| 86 | // toolstash save |
| 87 | // |
| 88 | // <edit compiler sources> |
| 89 | // |
| 90 | // # Install new tools, but do not rebuild the rest of tree, |
| 91 | // # since the compilers might generate buggy code. |
| 92 | // go tool dist install cmd/compile |
| 93 | // |
| 94 | // # Check that new tools behave identically to saved tools. |
| 95 | // go build -toolexec 'toolstash -cmp' -a std |
| 96 | // |
| 97 | // # If not, restore, in order to keep working on Go code. |
| 98 | // toolstash restore |
| 99 | // |
| 100 | // # Version Skew |
| 101 | // |
| 102 | // The Go tools write the current Go version to object files, and (outside |
| 103 | // release branches) that version includes the hash and time stamp |
| 104 | // of the most recent Git commit. Functionally equivalent |
| 105 | // compilers built at different Git versions may produce object files that |
| 106 | // differ only in the recorded version. Toolstash ignores version mismatches |
| 107 | // when comparing object files, but the standard tools will refuse to compile |
| 108 | // or link together packages with different object versions. |
| 109 | // |
| 110 | // For the full build in the final example above to work, both the stashed |
| 111 | // and the installed tools must use the same version string. |
| 112 | // One way to ensure this is not to commit any of the changes being |
| 113 | // tested, so that the Git HEAD hash is the same for both builds. |
| 114 | // A more robust way to force the tools to have the same version string |
| 115 | // is to write a $GOROOT/VERSION file, which overrides the Git-based version |
| 116 | // computation: |
| 117 | // |
| 118 | // echo devel >$GOROOT/VERSION |
| 119 | // |
| 120 | // The version can be arbitrary text, but to pass all.bash's API check, it must |
| 121 | // contain the substring “devel”. The VERSION file must be created before |
| 122 | // building either version of the toolchain. |
| 123 | package main // import "golang.org/x/tools/cmd/toolstash" |
| 124 | |
| 125 | import ( |
| 126 | "bufio" |
| 127 | "flag" |
| 128 | "fmt" |
| 129 | exec "golang.org/x/sys/execabs" |
| 130 | "io" |
| 131 | "io/ioutil" |
| 132 | "log" |
| 133 | "os" |
| 134 | "path/filepath" |
| 135 | "runtime" |
| 136 | "strings" |
| 137 | "time" |
| 138 | ) |
| 139 | |
| 140 | var usageMessage = `usage: toolstash [-n] [-v] [-cmp] command line |
| 141 | |
| 142 | Examples: |
| 143 | toolstash save |
| 144 | toolstash restore |
| 145 | toolstash go run x.go |
| 146 | toolstash compile x.go |
| 147 | toolstash -cmp compile x.go |
| 148 | |
| 149 | For details, godoc golang.org/x/tools/cmd/toolstash |
| 150 | ` |
| 151 | |
| 152 | func usage() { |
| 153 | fmt.Fprint(os.Stderr, usageMessage) |
| 154 | os.Exit(2) |
| 155 | } |
| 156 | |
| 157 | var ( |
| 158 | goCmd = flag.String("go", "go", "path to \"go\" command") |
| 159 | norun = flag.Bool("n", false, "print but do not run commands") |
| 160 | verbose = flag.Bool("v", false, "print commands being run") |
| 161 | cmp = flag.Bool("cmp", false, "compare tool object files") |
| 162 | timing = flag.Bool("t", false, "print time commands take") |
| 163 | ) |
| 164 | |
| 165 | var ( |
| 166 | cmd []string |
| 167 | tool string // name of tool: "go", "compile", etc |
| 168 | toolStash string // path to stashed tool |
| 169 | |
| 170 | goroot string |
| 171 | toolDir string |
| 172 | stashDir string |
| 173 | binDir string |
| 174 | ) |
| 175 | |
| 176 | func canCmp(name string, args []string) bool { |
| 177 | switch name { |
| 178 | case "asm", "compile", "link": |
| 179 | if len(args) == 1 && (args[0] == "-V" || strings.HasPrefix(args[0], "-V=")) { |
| 180 | // cmd/go uses "compile -V=full" to query the tool's build ID. |
| 181 | return false |
| 182 | } |
| 183 | return true |
| 184 | } |
| 185 | return len(name) == 2 && '0' <= name[0] && name[0] <= '9' && (name[1] == 'a' || name[1] == 'g' || name[1] == 'l') |
| 186 | } |
| 187 | |
| 188 | var binTools = []string{"go", "godoc", "gofmt"} |
| 189 | |
| 190 | func isBinTool(name string) bool { |
| 191 | return strings.HasPrefix(name, "go") |
| 192 | } |
| 193 | |
| 194 | func main() { |
| 195 | log.SetFlags(0) |
| 196 | log.SetPrefix("toolstash: ") |
| 197 | |
| 198 | flag.Usage = usage |
| 199 | flag.Parse() |
| 200 | cmd = flag.Args() |
| 201 | |
| 202 | if len(cmd) < 1 { |
| 203 | usage() |
| 204 | } |
| 205 | |
| 206 | s, err := exec.Command(*goCmd, "env", "GOROOT").CombinedOutput() |
| 207 | if err != nil { |
| 208 | log.Fatalf("%s env GOROOT: %v", *goCmd, err) |
| 209 | } |
| 210 | goroot = strings.TrimSpace(string(s)) |
| 211 | toolDir = filepath.Join(goroot, fmt.Sprintf("pkg/tool/%s_%s", runtime.GOOS, runtime.GOARCH)) |
| 212 | stashDir = filepath.Join(goroot, "pkg/toolstash") |
| 213 | |
| 214 | binDir = os.Getenv("GOBIN") |
| 215 | if binDir == "" { |
| 216 | binDir = filepath.Join(goroot, "bin") |
| 217 | } |
| 218 | |
| 219 | switch cmd[0] { |
| 220 | case "save": |
| 221 | save() |
| 222 | return |
| 223 | |
| 224 | case "restore": |
| 225 | restore() |
| 226 | return |
| 227 | } |
| 228 | |
| 229 | tool = cmd[0] |
| 230 | if i := strings.LastIndexAny(tool, `/\`); i >= 0 { |
| 231 | tool = tool[i+1:] |
| 232 | } |
| 233 | |
| 234 | if !strings.HasPrefix(tool, "a.out") { |
| 235 | toolStash = filepath.Join(stashDir, tool) |
| 236 | if _, err := os.Stat(toolStash); err != nil { |
| 237 | log.Print(err) |
| 238 | os.Exit(2) |
| 239 | } |
| 240 | |
| 241 | if *cmp && canCmp(tool, cmd[1:]) { |
| 242 | compareTool() |
| 243 | return |
| 244 | } |
| 245 | cmd[0] = toolStash |
| 246 | } |
| 247 | |
| 248 | if *norun { |
| 249 | fmt.Printf("%s\n", strings.Join(cmd, " ")) |
| 250 | return |
| 251 | } |
| 252 | if *verbose { |
| 253 | log.Print(strings.Join(cmd, " ")) |
| 254 | } |
| 255 | xcmd := exec.Command(cmd[0], cmd[1:]...) |
| 256 | xcmd.Stdin = os.Stdin |
| 257 | xcmd.Stdout = os.Stdout |
| 258 | xcmd.Stderr = os.Stderr |
| 259 | err = xcmd.Run() |
| 260 | if err != nil { |
| 261 | log.Fatal(err) |
| 262 | } |
| 263 | os.Exit(0) |
| 264 | } |
| 265 | |
| 266 | func compareTool() { |
| 267 | if !strings.Contains(cmd[0], "/") && !strings.Contains(cmd[0], `\`) { |
| 268 | cmd[0] = filepath.Join(toolDir, tool) |
| 269 | } |
| 270 | |
| 271 | outfile, ok := cmpRun(false, cmd) |
| 272 | if ok { |
| 273 | os.Remove(outfile + ".stash") |
| 274 | return |
| 275 | } |
| 276 | |
| 277 | extra := "-S=2" |
| 278 | switch { |
| 279 | default: |
| 280 | log.Fatalf("unknown tool %s", tool) |
| 281 | |
| 282 | case tool == "compile" || strings.HasSuffix(tool, "g"): // compiler |
| 283 | useDashN := true |
| 284 | dashcIndex := -1 |
| 285 | for i, s := range cmd { |
| 286 | if s == "-+" { |
| 287 | // Compiling runtime. Don't use -N. |
| 288 | useDashN = false |
| 289 | } |
| 290 | if strings.HasPrefix(s, "-c=") { |
| 291 | dashcIndex = i |
| 292 | } |
| 293 | } |
| 294 | cmdN := injectflags(cmd, nil, useDashN) |
| 295 | _, ok := cmpRun(false, cmdN) |
| 296 | if !ok { |
| 297 | if useDashN { |
| 298 | log.Printf("compiler output differs, with optimizers disabled (-N)") |
| 299 | } else { |
| 300 | log.Printf("compiler output differs") |
| 301 | } |
| 302 | if dashcIndex >= 0 { |
| 303 | cmd[dashcIndex] = "-c=1" |
| 304 | } |
| 305 | cmd = injectflags(cmd, []string{"-v", "-m=2"}, useDashN) |
| 306 | break |
| 307 | } |
| 308 | if dashcIndex >= 0 { |
| 309 | cmd[dashcIndex] = "-c=1" |
| 310 | } |
| 311 | cmd = injectflags(cmd, []string{"-v", "-m=2"}, false) |
| 312 | log.Printf("compiler output differs, only with optimizers enabled") |
| 313 | |
| 314 | case tool == "asm" || strings.HasSuffix(tool, "a"): // assembler |
| 315 | log.Printf("assembler output differs") |
| 316 | |
| 317 | case tool == "link" || strings.HasSuffix(tool, "l"): // linker |
| 318 | log.Printf("linker output differs") |
| 319 | extra = "-v=2" |
| 320 | } |
| 321 | |
| 322 | cmdS := injectflags(cmd, []string{extra}, false) |
| 323 | outfile, _ = cmpRun(true, cmdS) |
| 324 | |
| 325 | fmt.Fprintf(os.Stderr, "\n%s\n", compareLogs(outfile)) |
| 326 | os.Exit(2) |
| 327 | } |
| 328 | |
| 329 | func injectflags(cmd []string, extra []string, addDashN bool) []string { |
| 330 | x := []string{cmd[0]} |
| 331 | if addDashN { |
| 332 | x = append(x, "-N") |
| 333 | } |
| 334 | x = append(x, extra...) |
| 335 | x = append(x, cmd[1:]...) |
| 336 | return x |
| 337 | } |
| 338 | |
| 339 | func cmpRun(keepLog bool, cmd []string) (outfile string, match bool) { |
| 340 | cmdStash := make([]string, len(cmd)) |
| 341 | copy(cmdStash, cmd) |
| 342 | cmdStash[0] = toolStash |
| 343 | for i, arg := range cmdStash { |
| 344 | if arg == "-o" { |
| 345 | outfile = cmdStash[i+1] |
| 346 | cmdStash[i+1] += ".stash" |
| 347 | break |
| 348 | } |
| 349 | if strings.HasSuffix(arg, ".s") || strings.HasSuffix(arg, ".go") && '0' <= tool[0] && tool[0] <= '9' { |
| 350 | outfile = filepath.Base(arg[:strings.LastIndex(arg, ".")] + "." + tool[:1]) |
| 351 | cmdStash = append([]string{cmdStash[0], "-o", outfile + ".stash"}, cmdStash[1:]...) |
| 352 | break |
| 353 | } |
| 354 | } |
| 355 | |
| 356 | if outfile == "" { |
| 357 | log.Fatalf("cannot determine output file for command: %s", strings.Join(cmd, " ")) |
| 358 | } |
| 359 | |
| 360 | if *norun { |
| 361 | fmt.Printf("%s\n", strings.Join(cmd, " ")) |
| 362 | fmt.Printf("%s\n", strings.Join(cmdStash, " ")) |
| 363 | os.Exit(0) |
| 364 | } |
| 365 | |
| 366 | out, err := runCmd(cmd, keepLog, outfile+".log") |
| 367 | if err != nil { |
| 368 | log.Printf("running: %s", strings.Join(cmd, " ")) |
| 369 | os.Stderr.Write(out) |
| 370 | log.Fatal(err) |
| 371 | } |
| 372 | |
| 373 | outStash, err := runCmd(cmdStash, keepLog, outfile+".stash.log") |
| 374 | if err != nil { |
| 375 | log.Printf("running: %s", strings.Join(cmdStash, " ")) |
| 376 | log.Printf("installed tool succeeded but stashed tool failed.\n") |
| 377 | if len(out) > 0 { |
| 378 | log.Printf("installed tool output:") |
| 379 | os.Stderr.Write(out) |
| 380 | } |
| 381 | if len(outStash) > 0 { |
| 382 | log.Printf("stashed tool output:") |
| 383 | os.Stderr.Write(outStash) |
| 384 | } |
| 385 | log.Fatal(err) |
| 386 | } |
| 387 | |
| 388 | return outfile, sameObject(outfile, outfile+".stash") |
| 389 | } |
| 390 | |
| 391 | func sameObject(file1, file2 string) bool { |
| 392 | f1, err := os.Open(file1) |
| 393 | if err != nil { |
| 394 | log.Fatal(err) |
| 395 | } |
| 396 | defer f1.Close() |
| 397 | |
| 398 | f2, err := os.Open(file2) |
| 399 | if err != nil { |
| 400 | log.Fatal(err) |
| 401 | } |
| 402 | defer f2.Close() |
| 403 | |
| 404 | b1 := bufio.NewReader(f1) |
| 405 | b2 := bufio.NewReader(f2) |
| 406 | |
| 407 | // Go object files and archives contain lines of the form |
| 408 | // go object <goos> <goarch> <version> |
| 409 | // By default, the version on development branches includes |
| 410 | // the Git hash and time stamp for the most recent commit. |
| 411 | // We allow the versions to differ. |
| 412 | if !skipVersion(b1, b2, file1, file2) { |
| 413 | return false |
| 414 | } |
| 415 | |
| 416 | lastByte := byte(0) |
| 417 | for { |
| 418 | c1, err1 := b1.ReadByte() |
| 419 | c2, err2 := b2.ReadByte() |
| 420 | if err1 == io.EOF && err2 == io.EOF { |
| 421 | return true |
| 422 | } |
| 423 | if err1 != nil { |
| 424 | log.Fatalf("reading %s: %v", file1, err1) |
| 425 | } |
| 426 | if err2 != nil { |
| 427 | log.Fatalf("reading %s: %v", file2, err1) |
| 428 | } |
| 429 | if c1 != c2 { |
| 430 | return false |
| 431 | } |
| 432 | if lastByte == '`' && c1 == '\n' { |
| 433 | if !skipVersion(b1, b2, file1, file2) { |
| 434 | return false |
| 435 | } |
| 436 | } |
| 437 | lastByte = c1 |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | func skipVersion(b1, b2 *bufio.Reader, file1, file2 string) bool { |
| 442 | // Consume "go object " prefix, if there. |
| 443 | prefix := "go object " |
| 444 | for i := 0; i < len(prefix); i++ { |
| 445 | c1, err1 := b1.ReadByte() |
| 446 | c2, err2 := b2.ReadByte() |
| 447 | if err1 == io.EOF && err2 == io.EOF { |
| 448 | return true |
| 449 | } |
| 450 | if err1 != nil { |
| 451 | log.Fatalf("reading %s: %v", file1, err1) |
| 452 | } |
| 453 | if err2 != nil { |
| 454 | log.Fatalf("reading %s: %v", file2, err1) |
| 455 | } |
| 456 | if c1 != c2 { |
| 457 | return false |
| 458 | } |
| 459 | if c1 != prefix[i] { |
| 460 | return true // matching bytes, just not a version |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | // Keep comparing until second space. |
| 465 | // Must continue to match. |
| 466 | // If we see a \n, it's not a version string after all. |
| 467 | for numSpace := 0; numSpace < 2; { |
| 468 | c1, err1 := b1.ReadByte() |
| 469 | c2, err2 := b2.ReadByte() |
| 470 | if err1 == io.EOF && err2 == io.EOF { |
| 471 | return true |
| 472 | } |
| 473 | if err1 != nil { |
| 474 | log.Fatalf("reading %s: %v", file1, err1) |
| 475 | } |
| 476 | if err2 != nil { |
| 477 | log.Fatalf("reading %s: %v", file2, err1) |
| 478 | } |
| 479 | if c1 != c2 { |
| 480 | return false |
| 481 | } |
| 482 | if c1 == '\n' { |
| 483 | return true |
| 484 | } |
| 485 | if c1 == ' ' { |
| 486 | numSpace++ |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | // Have now seen 'go object goos goarch ' in both files. |
| 491 | // Now they're allowed to diverge, until the \n, which |
| 492 | // must be present. |
| 493 | for { |
| 494 | c1, err1 := b1.ReadByte() |
| 495 | if err1 == io.EOF { |
| 496 | log.Fatalf("reading %s: unexpected EOF", file1) |
| 497 | } |
| 498 | if err1 != nil { |
| 499 | log.Fatalf("reading %s: %v", file1, err1) |
| 500 | } |
| 501 | if c1 == '\n' { |
| 502 | break |
| 503 | } |
| 504 | } |
| 505 | for { |
| 506 | c2, err2 := b2.ReadByte() |
| 507 | if err2 == io.EOF { |
| 508 | log.Fatalf("reading %s: unexpected EOF", file2) |
| 509 | } |
| 510 | if err2 != nil { |
| 511 | log.Fatalf("reading %s: %v", file2, err2) |
| 512 | } |
| 513 | if c2 == '\n' { |
| 514 | break |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | // Consumed "matching" versions from both. |
| 519 | return true |
| 520 | } |
| 521 | |
| 522 | func runCmd(cmd []string, keepLog bool, logName string) (output []byte, err error) { |
| 523 | if *verbose { |
| 524 | log.Print(strings.Join(cmd, " ")) |
| 525 | } |
| 526 | |
| 527 | if *timing { |
| 528 | t0 := time.Now() |
| 529 | defer func() { |
| 530 | log.Printf("%.3fs elapsed # %s\n", time.Since(t0).Seconds(), strings.Join(cmd, " ")) |
| 531 | }() |
| 532 | } |
| 533 | |
| 534 | xcmd := exec.Command(cmd[0], cmd[1:]...) |
| 535 | if !keepLog { |
| 536 | return xcmd.CombinedOutput() |
| 537 | } |
| 538 | |
| 539 | f, err := os.Create(logName) |
| 540 | if err != nil { |
| 541 | log.Fatal(err) |
| 542 | } |
| 543 | fmt.Fprintf(f, "GOOS=%s GOARCH=%s %s\n", os.Getenv("GOOS"), os.Getenv("GOARCH"), strings.Join(cmd, " ")) |
| 544 | xcmd.Stdout = f |
| 545 | xcmd.Stderr = f |
| 546 | defer f.Close() |
| 547 | return nil, xcmd.Run() |
| 548 | } |
| 549 | |
| 550 | func save() { |
| 551 | if err := os.MkdirAll(stashDir, 0777); err != nil { |
| 552 | log.Fatal(err) |
| 553 | } |
| 554 | |
| 555 | toolDir := filepath.Join(goroot, fmt.Sprintf("pkg/tool/%s_%s", runtime.GOOS, runtime.GOARCH)) |
| 556 | files, err := ioutil.ReadDir(toolDir) |
| 557 | if err != nil { |
| 558 | log.Fatal(err) |
| 559 | } |
| 560 | |
| 561 | for _, file := range files { |
| 562 | if shouldSave(file.Name()) && file.Mode().IsRegular() { |
| 563 | cp(filepath.Join(toolDir, file.Name()), filepath.Join(stashDir, file.Name())) |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | for _, name := range binTools { |
| 568 | if !shouldSave(name) { |
| 569 | continue |
| 570 | } |
| 571 | src := filepath.Join(binDir, name) |
| 572 | if _, err := os.Stat(src); err == nil { |
| 573 | cp(src, filepath.Join(stashDir, name)) |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | checkShouldSave() |
| 578 | } |
| 579 | |
| 580 | func restore() { |
| 581 | files, err := ioutil.ReadDir(stashDir) |
| 582 | if err != nil { |
| 583 | log.Fatal(err) |
| 584 | } |
| 585 | |
| 586 | for _, file := range files { |
| 587 | if shouldSave(file.Name()) && file.Mode().IsRegular() { |
| 588 | targ := toolDir |
| 589 | if isBinTool(file.Name()) { |
| 590 | targ = binDir |
| 591 | } |
| 592 | cp(filepath.Join(stashDir, file.Name()), filepath.Join(targ, file.Name())) |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | checkShouldSave() |
| 597 | } |
| 598 | |
| 599 | func shouldSave(name string) bool { |
| 600 | if len(cmd) == 1 { |
| 601 | return true |
| 602 | } |
| 603 | ok := false |
| 604 | for i, arg := range cmd { |
| 605 | if i > 0 && name == arg { |
| 606 | ok = true |
| 607 | cmd[i] = "DONE" |
| 608 | } |
| 609 | } |
| 610 | return ok |
| 611 | } |
| 612 | |
| 613 | func checkShouldSave() { |
| 614 | var missing []string |
| 615 | for _, arg := range cmd[1:] { |
| 616 | if arg != "DONE" { |
| 617 | missing = append(missing, arg) |
| 618 | } |
| 619 | } |
| 620 | if len(missing) > 0 { |
| 621 | log.Fatalf("%s did not find tools: %s", cmd[0], strings.Join(missing, " ")) |
| 622 | } |
| 623 | } |
| 624 | |
| 625 | func cp(src, dst string) { |
| 626 | if *verbose { |
| 627 | fmt.Printf("cp %s %s\n", src, dst) |
| 628 | } |
| 629 | data, err := ioutil.ReadFile(src) |
| 630 | if err != nil { |
| 631 | log.Fatal(err) |
| 632 | } |
| 633 | if err := ioutil.WriteFile(dst, data, 0777); err != nil { |
| 634 | log.Fatal(err) |
| 635 | } |
| 636 | } |
| 637 |
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