diff options
Diffstat (limited to 'libgo/go/cmd/go/internal/version/version.go')
-rw-r--r-- | libgo/go/cmd/go/internal/version/version.go | 101 |
1 files changed, 22 insertions, 79 deletions
diff --git a/libgo/go/cmd/go/internal/version/version.go b/libgo/go/cmd/go/internal/version/version.go index 58cbd32e78d..52502e95c6d 100644 --- a/libgo/go/cmd/go/internal/version/version.go +++ b/libgo/go/cmd/go/internal/version/version.go @@ -8,7 +8,8 @@ package version import ( "bytes" "context" - "encoding/binary" + "debug/buildinfo" + "errors" "fmt" "io/fs" "os" @@ -62,8 +63,14 @@ func runVersion(ctx context.Context, cmd *base.Command, args []string) { // a reasonable use case. For example, imagine GOFLAGS=-v to // turn "verbose mode" on for all Go commands, which should not // break "go version". - if (!base.InGOFLAGS("-m") && *versionM) || (!base.InGOFLAGS("-v") && *versionV) { - fmt.Fprintf(os.Stderr, "go version: flags can only be used with arguments\n") + var argOnlyFlag string + if !base.InGOFLAGS("-m") && *versionM { + argOnlyFlag = "-m" + } else if !base.InGOFLAGS("-v") && *versionV { + argOnlyFlag = "-v" + } + if argOnlyFlag != "" { + fmt.Fprintf(os.Stderr, "go: 'go version' only accepts %s flag with arguments\n", argOnlyFlag) base.SetExitStatus(2) return } @@ -135,90 +142,26 @@ func scanFile(file string, info fs.FileInfo, mustPrint bool) { return } - x, err := openExe(file) + bi, err := buildinfo.ReadFile(file) if err != nil { if mustPrint { - fmt.Fprintf(os.Stderr, "%s: %v\n", file, err) - } - return - } - defer x.Close() - - vers, mod := findVers(x) - if vers == "" { - if mustPrint { - fmt.Fprintf(os.Stderr, "%s: go version not found\n", file) + if pathErr := (*os.PathError)(nil); errors.As(err, &pathErr) && filepath.Clean(pathErr.Path) == filepath.Clean(file) { + fmt.Fprintf(os.Stderr, "%v\n", file) + } else { + fmt.Fprintf(os.Stderr, "%s: %v\n", file, err) + } } return } - fmt.Printf("%s: %s\n", file, vers) - if *versionM && mod != "" { - fmt.Printf("\t%s\n", strings.ReplaceAll(mod[:len(mod)-1], "\n", "\n\t")) - } -} - -// The build info blob left by the linker is identified by -// a 16-byte header, consisting of buildInfoMagic (14 bytes), -// the binary's pointer size (1 byte), -// and whether the binary is big endian (1 byte). -var buildInfoMagic = []byte("\xff Go buildinf:") - -// findVers finds and returns the Go version and module version information -// in the executable x. -func findVers(x exe) (vers, mod string) { - // Read the first 64kB of text to find the build info blob. - text := x.DataStart() - data, err := x.ReadData(text, 64*1024) + fmt.Printf("%s: %s\n", file, bi.GoVersion) + bi.GoVersion = "" // suppress printing go version again + mod, err := bi.MarshalText() if err != nil { + fmt.Fprintf(os.Stderr, "%s: formatting build info: %v\n", file, err) return } - for ; !bytes.HasPrefix(data, buildInfoMagic); data = data[32:] { - if len(data) < 32 { - return - } - } - - // Decode the blob. - ptrSize := int(data[14]) - bigEndian := data[15] != 0 - var bo binary.ByteOrder - if bigEndian { - bo = binary.BigEndian - } else { - bo = binary.LittleEndian - } - var readPtr func([]byte) uint64 - if ptrSize == 4 { - readPtr = func(b []byte) uint64 { return uint64(bo.Uint32(b)) } - } else { - readPtr = bo.Uint64 - } - vers = readString(x, ptrSize, readPtr, readPtr(data[16:])) - if vers == "" { - return - } - mod = readString(x, ptrSize, readPtr, readPtr(data[16+ptrSize:])) - if len(mod) >= 33 && mod[len(mod)-17] == '\n' { - // Strip module framing. - mod = mod[16 : len(mod)-16] - } else { - mod = "" - } - return -} - -// readString returns the string at address addr in the executable x. -func readString(x exe, ptrSize int, readPtr func([]byte) uint64, addr uint64) string { - hdr, err := x.ReadData(addr, uint64(2*ptrSize)) - if err != nil || len(hdr) < 2*ptrSize { - return "" - } - dataAddr := readPtr(hdr) - dataLen := readPtr(hdr[ptrSize:]) - data, err := x.ReadData(dataAddr, dataLen) - if err != nil || uint64(len(data)) < dataLen { - return "" + if *versionM && len(mod) > 0 { + fmt.Printf("\t%s\n", bytes.ReplaceAll(mod[:len(mod)-1], []byte("\n"), []byte("\n\t"))) } - return string(data) } |