diff options
Diffstat (limited to 'vendor/golang.org/x/tools/internal/gocommand')
3 files changed, 0 insertions, 789 deletions
diff --git a/vendor/golang.org/x/tools/internal/gocommand/invoke.go b/vendor/golang.org/x/tools/internal/gocommand/invoke.go deleted file mode 100644 index 2e59ff8..0000000 --- a/vendor/golang.org/x/tools/internal/gocommand/invoke.go +++ /dev/null @@ -1,555 +0,0 @@ -// Copyright 2020 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// Package gocommand is a helper for calling the go command. -package gocommand - -import ( - "bytes" - "context" - "encoding/json" - "errors" - "fmt" - "io" - "log" - "os" - "os/exec" - "path/filepath" - "reflect" - "regexp" - "runtime" - "strconv" - "strings" - "sync" - "time" - - "golang.org/x/tools/internal/event" - "golang.org/x/tools/internal/event/keys" - "golang.org/x/tools/internal/event/label" -) - -// An Runner will run go command invocations and serialize -// them if it sees a concurrency error. -type Runner struct { - // once guards the runner initialization. - once sync.Once - - // inFlight tracks available workers. - inFlight chan struct{} - - // serialized guards the ability to run a go command serially, - // to avoid deadlocks when claiming workers. - serialized chan struct{} -} - -const maxInFlight = 10 - -func (runner *Runner) initialize() { - runner.once.Do(func() { - runner.inFlight = make(chan struct{}, maxInFlight) - runner.serialized = make(chan struct{}, 1) - }) -} - -// 1.13: go: updates to go.mod needed, but contents have changed -// 1.14: go: updating go.mod: existing contents have changed since last read -var modConcurrencyError = regexp.MustCompile(`go:.*go.mod.*contents have changed`) - -// event keys for go command invocations -var ( - verb = keys.NewString("verb", "go command verb") - directory = keys.NewString("directory", "") -) - -func invLabels(inv Invocation) []label.Label { - return []label.Label{verb.Of(inv.Verb), directory.Of(inv.WorkingDir)} -} - -// Run is a convenience wrapper around RunRaw. -// It returns only stdout and a "friendly" error. -func (runner *Runner) Run(ctx context.Context, inv Invocation) (*bytes.Buffer, error) { - ctx, done := event.Start(ctx, "gocommand.Runner.Run", invLabels(inv)...) - defer done() - - stdout, _, friendly, _ := runner.RunRaw(ctx, inv) - return stdout, friendly -} - -// RunPiped runs the invocation serially, always waiting for any concurrent -// invocations to complete first. -func (runner *Runner) RunPiped(ctx context.Context, inv Invocation, stdout, stderr io.Writer) error { - ctx, done := event.Start(ctx, "gocommand.Runner.RunPiped", invLabels(inv)...) - defer done() - - _, err := runner.runPiped(ctx, inv, stdout, stderr) - return err -} - -// RunRaw runs the invocation, serializing requests only if they fight over -// go.mod changes. -// Postcondition: both error results have same nilness. -func (runner *Runner) RunRaw(ctx context.Context, inv Invocation) (*bytes.Buffer, *bytes.Buffer, error, error) { - ctx, done := event.Start(ctx, "gocommand.Runner.RunRaw", invLabels(inv)...) - defer done() - // Make sure the runner is always initialized. - runner.initialize() - - // First, try to run the go command concurrently. - stdout, stderr, friendlyErr, err := runner.runConcurrent(ctx, inv) - - // If we encounter a load concurrency error, we need to retry serially. - if friendlyErr != nil && modConcurrencyError.MatchString(friendlyErr.Error()) { - event.Error(ctx, "Load concurrency error, will retry serially", err) - - // Run serially by calling runPiped. - stdout.Reset() - stderr.Reset() - friendlyErr, err = runner.runPiped(ctx, inv, stdout, stderr) - } - - return stdout, stderr, friendlyErr, err -} - -// Postcondition: both error results have same nilness. -func (runner *Runner) runConcurrent(ctx context.Context, inv Invocation) (*bytes.Buffer, *bytes.Buffer, error, error) { - // Wait for 1 worker to become available. - select { - case <-ctx.Done(): - return nil, nil, ctx.Err(), ctx.Err() - case runner.inFlight <- struct{}{}: - defer func() { <-runner.inFlight }() - } - - stdout, stderr := &bytes.Buffer{}, &bytes.Buffer{} - friendlyErr, err := inv.runWithFriendlyError(ctx, stdout, stderr) - return stdout, stderr, friendlyErr, err -} - -// Postcondition: both error results have same nilness. -func (runner *Runner) runPiped(ctx context.Context, inv Invocation, stdout, stderr io.Writer) (error, error) { - // Make sure the runner is always initialized. - runner.initialize() - - // Acquire the serialization lock. This avoids deadlocks between two - // runPiped commands. - select { - case <-ctx.Done(): - return ctx.Err(), ctx.Err() - case runner.serialized <- struct{}{}: - defer func() { <-runner.serialized }() - } - - // Wait for all in-progress go commands to return before proceeding, - // to avoid load concurrency errors. - for i := 0; i < maxInFlight; i++ { - select { - case <-ctx.Done(): - return ctx.Err(), ctx.Err() - case runner.inFlight <- struct{}{}: - // Make sure we always "return" any workers we took. - defer func() { <-runner.inFlight }() - } - } - - return inv.runWithFriendlyError(ctx, stdout, stderr) -} - -// An Invocation represents a call to the go command. -type Invocation struct { - Verb string - Args []string - BuildFlags []string - - // If ModFlag is set, the go command is invoked with -mod=ModFlag. - // TODO(rfindley): remove, in favor of Args. - ModFlag string - - // If ModFile is set, the go command is invoked with -modfile=ModFile. - // TODO(rfindley): remove, in favor of Args. - ModFile string - - // Overlay is the name of the JSON overlay file that describes - // unsaved editor buffers; see [WriteOverlays]. - // If set, the go command is invoked with -overlay=Overlay. - // TODO(rfindley): remove, in favor of Args. - Overlay string - - // If CleanEnv is set, the invocation will run only with the environment - // in Env, not starting with os.Environ. - CleanEnv bool - Env []string - WorkingDir string - Logf func(format string, args ...interface{}) -} - -// Postcondition: both error results have same nilness. -func (i *Invocation) runWithFriendlyError(ctx context.Context, stdout, stderr io.Writer) (friendlyError error, rawError error) { - rawError = i.run(ctx, stdout, stderr) - if rawError != nil { - friendlyError = rawError - // Check for 'go' executable not being found. - if ee, ok := rawError.(*exec.Error); ok && ee.Err == exec.ErrNotFound { - friendlyError = fmt.Errorf("go command required, not found: %v", ee) - } - if ctx.Err() != nil { - friendlyError = ctx.Err() - } - friendlyError = fmt.Errorf("err: %v: stderr: %s", friendlyError, stderr) - } - return -} - -// logf logs if i.Logf is non-nil. -func (i *Invocation) logf(format string, args ...any) { - if i.Logf != nil { - i.Logf(format, args...) - } -} - -func (i *Invocation) run(ctx context.Context, stdout, stderr io.Writer) error { - goArgs := []string{i.Verb} - - appendModFile := func() { - if i.ModFile != "" { - goArgs = append(goArgs, "-modfile="+i.ModFile) - } - } - appendModFlag := func() { - if i.ModFlag != "" { - goArgs = append(goArgs, "-mod="+i.ModFlag) - } - } - appendOverlayFlag := func() { - if i.Overlay != "" { - goArgs = append(goArgs, "-overlay="+i.Overlay) - } - } - - switch i.Verb { - case "env", "version": - goArgs = append(goArgs, i.Args...) - case "mod": - // mod needs the sub-verb before flags. - goArgs = append(goArgs, i.Args[0]) - appendModFile() - goArgs = append(goArgs, i.Args[1:]...) - case "get": - goArgs = append(goArgs, i.BuildFlags...) - appendModFile() - goArgs = append(goArgs, i.Args...) - - default: // notably list and build. - goArgs = append(goArgs, i.BuildFlags...) - appendModFile() - appendModFlag() - appendOverlayFlag() - goArgs = append(goArgs, i.Args...) - } - cmd := exec.Command("go", goArgs...) - cmd.Stdout = stdout - cmd.Stderr = stderr - - // cmd.WaitDelay was added only in go1.20 (see #50436). - if waitDelay := reflect.ValueOf(cmd).Elem().FieldByName("WaitDelay"); waitDelay.IsValid() { - // https://go.dev/issue/59541: don't wait forever copying stderr - // after the command has exited. - // After CL 484741 we copy stdout manually, so we we'll stop reading that as - // soon as ctx is done. However, we also don't want to wait around forever - // for stderr. Give a much-longer-than-reasonable delay and then assume that - // something has wedged in the kernel or runtime. - waitDelay.Set(reflect.ValueOf(30 * time.Second)) - } - - // The cwd gets resolved to the real path. On Darwin, where - // /tmp is a symlink, this breaks anything that expects the - // working directory to keep the original path, including the - // go command when dealing with modules. - // - // os.Getwd has a special feature where if the cwd and the PWD - // are the same node then it trusts the PWD, so by setting it - // in the env for the child process we fix up all the paths - // returned by the go command. - if !i.CleanEnv { - cmd.Env = os.Environ() - } - cmd.Env = append(cmd.Env, i.Env...) - if i.WorkingDir != "" { - cmd.Env = append(cmd.Env, "PWD="+i.WorkingDir) - cmd.Dir = i.WorkingDir - } - - debugStr := cmdDebugStr(cmd) - i.logf("starting %v", debugStr) - start := time.Now() - defer func() { - i.logf("%s for %v", time.Since(start), debugStr) - }() - - return runCmdContext(ctx, cmd) -} - -// DebugHangingGoCommands may be set by tests to enable additional -// instrumentation (including panics) for debugging hanging Go commands. -// -// See golang/go#54461 for details. -var DebugHangingGoCommands = false - -// runCmdContext is like exec.CommandContext except it sends os.Interrupt -// before os.Kill. -func runCmdContext(ctx context.Context, cmd *exec.Cmd) (err error) { - // If cmd.Stdout is not an *os.File, the exec package will create a pipe and - // copy it to the Writer in a goroutine until the process has finished and - // either the pipe reaches EOF or command's WaitDelay expires. - // - // However, the output from 'go list' can be quite large, and we don't want to - // keep reading (and allocating buffers) if we've already decided we don't - // care about the output. We don't want to wait for the process to finish, and - // we don't wait to wait for the WaitDelay to expire either. - // - // Instead, if cmd.Stdout requires a copying goroutine we explicitly replace - // it with a pipe (which is an *os.File), which we can close in order to stop - // copying output as soon as we realize we don't care about it. - var stdoutW *os.File - if cmd.Stdout != nil { - if _, ok := cmd.Stdout.(*os.File); !ok { - var stdoutR *os.File - stdoutR, stdoutW, err = os.Pipe() - if err != nil { - return err - } - prevStdout := cmd.Stdout - cmd.Stdout = stdoutW - - stdoutErr := make(chan error, 1) - go func() { - _, err := io.Copy(prevStdout, stdoutR) - if err != nil { - err = fmt.Errorf("copying stdout: %w", err) - } - stdoutErr <- err - }() - defer func() { - // We started a goroutine to copy a stdout pipe. - // Wait for it to finish, or terminate it if need be. - var err2 error - select { - case err2 = <-stdoutErr: - stdoutR.Close() - case <-ctx.Done(): - stdoutR.Close() - // Per https://pkg.go.dev/os#File.Close, the call to stdoutR.Close - // should cause the Read call in io.Copy to unblock and return - // immediately, but we still need to receive from stdoutErr to confirm - // that it has happened. - <-stdoutErr - err2 = ctx.Err() - } - if err == nil { - err = err2 - } - }() - - // Per https://pkg.go.dev/os/exec#Cmd, “If Stdout and Stderr are the - // same writer, and have a type that can be compared with ==, at most - // one goroutine at a time will call Write.” - // - // Since we're starting a goroutine that writes to cmd.Stdout, we must - // also update cmd.Stderr so that it still holds. - func() { - defer func() { recover() }() - if cmd.Stderr == prevStdout { - cmd.Stderr = cmd.Stdout - } - }() - } - } - - startTime := time.Now() - err = cmd.Start() - if stdoutW != nil { - // The child process has inherited the pipe file, - // so close the copy held in this process. - stdoutW.Close() - stdoutW = nil - } - if err != nil { - return err - } - - resChan := make(chan error, 1) - go func() { - resChan <- cmd.Wait() - }() - - // If we're interested in debugging hanging Go commands, stop waiting after a - // minute and panic with interesting information. - debug := DebugHangingGoCommands - if debug { - timer := time.NewTimer(1 * time.Minute) - defer timer.Stop() - select { - case err := <-resChan: - return err - case <-timer.C: - HandleHangingGoCommand(startTime, cmd) - case <-ctx.Done(): - } - } else { - select { - case err := <-resChan: - return err - case <-ctx.Done(): - } - } - - // Cancelled. Interrupt and see if it ends voluntarily. - if err := cmd.Process.Signal(os.Interrupt); err == nil { - // (We used to wait only 1s but this proved - // fragile on loaded builder machines.) - timer := time.NewTimer(5 * time.Second) - defer timer.Stop() - select { - case err := <-resChan: - return err - case <-timer.C: - } - } - - // Didn't shut down in response to interrupt. Kill it hard. - // TODO(rfindley): per advice from bcmills@, it may be better to send SIGQUIT - // on certain platforms, such as unix. - if err := cmd.Process.Kill(); err != nil && !errors.Is(err, os.ErrProcessDone) && debug { - log.Printf("error killing the Go command: %v", err) - } - - return <-resChan -} - -func HandleHangingGoCommand(start time.Time, cmd *exec.Cmd) { - switch runtime.GOOS { - case "linux", "darwin", "freebsd", "netbsd": - fmt.Fprintln(os.Stderr, `DETECTED A HANGING GO COMMAND - -The gopls test runner has detected a hanging go command. In order to debug -this, the output of ps and lsof/fstat is printed below. - -See golang/go#54461 for more details.`) - - fmt.Fprintln(os.Stderr, "\nps axo ppid,pid,command:") - fmt.Fprintln(os.Stderr, "-------------------------") - psCmd := exec.Command("ps", "axo", "ppid,pid,command") - psCmd.Stdout = os.Stderr - psCmd.Stderr = os.Stderr - if err := psCmd.Run(); err != nil { - panic(fmt.Sprintf("running ps: %v", err)) - } - - listFiles := "lsof" - if runtime.GOOS == "freebsd" || runtime.GOOS == "netbsd" { - listFiles = "fstat" - } - - fmt.Fprintln(os.Stderr, "\n"+listFiles+":") - fmt.Fprintln(os.Stderr, "-----") - listFilesCmd := exec.Command(listFiles) - listFilesCmd.Stdout = os.Stderr - listFilesCmd.Stderr = os.Stderr - if err := listFilesCmd.Run(); err != nil { - panic(fmt.Sprintf("running %s: %v", listFiles, err)) - } - } - panic(fmt.Sprintf("detected hanging go command (golang/go#54461); waited %s\n\tcommand:%s\n\tpid:%d", time.Since(start), cmd, cmd.Process.Pid)) -} - -func cmdDebugStr(cmd *exec.Cmd) string { - env := make(map[string]string) - for _, kv := range cmd.Env { - split := strings.SplitN(kv, "=", 2) - if len(split) == 2 { - k, v := split[0], split[1] - env[k] = v - } - } - - var args []string - for _, arg := range cmd.Args { - quoted := strconv.Quote(arg) - if quoted[1:len(quoted)-1] != arg || strings.Contains(arg, " ") { - args = append(args, quoted) - } else { - args = append(args, arg) - } - } - return fmt.Sprintf("GOROOT=%v GOPATH=%v GO111MODULE=%v GOPROXY=%v PWD=%v %v", env["GOROOT"], env["GOPATH"], env["GO111MODULE"], env["GOPROXY"], env["PWD"], strings.Join(args, " ")) -} - -// WriteOverlays writes each value in the overlay (see the Overlay -// field of go/packages.Config) to a temporary file and returns the name -// of a JSON file describing the mapping that is suitable for the "go -// list -overlay" flag. -// -// On success, the caller must call the cleanup function exactly once -// when the files are no longer needed. -func WriteOverlays(overlay map[string][]byte) (filename string, cleanup func(), err error) { - // Do nothing if there are no overlays in the config. - if len(overlay) == 0 { - return "", func() {}, nil - } - - dir, err := os.MkdirTemp("", "gocommand-*") - if err != nil { - return "", nil, err - } - - // The caller must clean up this directory, - // unless this function returns an error. - // (The cleanup operand of each return - // statement below is ignored.) - defer func() { - cleanup = func() { - os.RemoveAll(dir) - } - if err != nil { - cleanup() - cleanup = nil - } - }() - - // Write each map entry to a temporary file. - overlays := make(map[string]string) - for k, v := range overlay { - // Use a unique basename for each file (001-foo.go), - // to avoid creating nested directories. - base := fmt.Sprintf("%d-%s", 1+len(overlays), filepath.Base(k)) - filename := filepath.Join(dir, base) - err := os.WriteFile(filename, v, 0666) - if err != nil { - return "", nil, err - } - overlays[k] = filename - } - - // Write the JSON overlay file that maps logical file names to temp files. - // - // OverlayJSON is the format overlay files are expected to be in. - // The Replace map maps from overlaid paths to replacement paths: - // the Go command will forward all reads trying to open - // each overlaid path to its replacement path, or consider the overlaid - // path not to exist if the replacement path is empty. - // - // From golang/go#39958. - type OverlayJSON struct { - Replace map[string]string `json:"replace,omitempty"` - } - b, err := json.Marshal(OverlayJSON{Replace: overlays}) - if err != nil { - return "", nil, err - } - filename = filepath.Join(dir, "overlay.json") - if err := os.WriteFile(filename, b, 0666); err != nil { - return "", nil, err - } - - return filename, nil, nil -} diff --git a/vendor/golang.org/x/tools/internal/gocommand/vendor.go b/vendor/golang.org/x/tools/internal/gocommand/vendor.go deleted file mode 100644 index e38d1fb..0000000 --- a/vendor/golang.org/x/tools/internal/gocommand/vendor.go +++ /dev/null @@ -1,163 +0,0 @@ -// Copyright 2020 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package gocommand - -import ( - "bytes" - "context" - "fmt" - "os" - "path/filepath" - "regexp" - "strings" - "time" - - "golang.org/x/mod/semver" -) - -// ModuleJSON holds information about a module. -type ModuleJSON struct { - Path string // module path - Version string // module version - Versions []string // available module versions (with -versions) - Replace *ModuleJSON // replaced by this module - Time *time.Time // time version was created - Update *ModuleJSON // available update, if any (with -u) - Main bool // is this the main module? - Indirect bool // is this module only an indirect dependency of main module? - Dir string // directory holding files for this module, if any - GoMod string // path to go.mod file used when loading this module, if any - GoVersion string // go version used in module -} - -var modFlagRegexp = regexp.MustCompile(`-mod[ =](\w+)`) - -// VendorEnabled reports whether vendoring is enabled. It takes a *Runner to execute Go commands -// with the supplied context.Context and Invocation. The Invocation can contain pre-defined fields, -// of which only Verb and Args are modified to run the appropriate Go command. -// Inspired by setDefaultBuildMod in modload/init.go -func VendorEnabled(ctx context.Context, inv Invocation, r *Runner) (bool, *ModuleJSON, error) { - mainMod, go114, err := getMainModuleAnd114(ctx, inv, r) - if err != nil { - return false, nil, err - } - - // We check the GOFLAGS to see if there is anything overridden or not. - inv.Verb = "env" - inv.Args = []string{"GOFLAGS"} - stdout, err := r.Run(ctx, inv) - if err != nil { - return false, nil, err - } - goflags := string(bytes.TrimSpace(stdout.Bytes())) - matches := modFlagRegexp.FindStringSubmatch(goflags) - var modFlag string - if len(matches) != 0 { - modFlag = matches[1] - } - // Don't override an explicit '-mod=' argument. - if modFlag == "vendor" { - return true, mainMod, nil - } else if modFlag != "" { - return false, nil, nil - } - if mainMod == nil || !go114 { - return false, nil, nil - } - // Check 1.14's automatic vendor mode. - if fi, err := os.Stat(filepath.Join(mainMod.Dir, "vendor")); err == nil && fi.IsDir() { - if mainMod.GoVersion != "" && semver.Compare("v"+mainMod.GoVersion, "v1.14") >= 0 { - // The Go version is at least 1.14, and a vendor directory exists. - // Set -mod=vendor by default. - return true, mainMod, nil - } - } - return false, nil, nil -} - -// getMainModuleAnd114 gets one of the main modules' information and whether the -// go command in use is 1.14+. This is the information needed to figure out -// if vendoring should be enabled. -func getMainModuleAnd114(ctx context.Context, inv Invocation, r *Runner) (*ModuleJSON, bool, error) { - const format = `{{.Path}} -{{.Dir}} -{{.GoMod}} -{{.GoVersion}} -{{range context.ReleaseTags}}{{if eq . "go1.14"}}{{.}}{{end}}{{end}} -` - inv.Verb = "list" - inv.Args = []string{"-m", "-f", format} - stdout, err := r.Run(ctx, inv) - if err != nil { - return nil, false, err - } - - lines := strings.Split(stdout.String(), "\n") - if len(lines) < 5 { - return nil, false, fmt.Errorf("unexpected stdout: %q", stdout.String()) - } - mod := &ModuleJSON{ - Path: lines[0], - Dir: lines[1], - GoMod: lines[2], - GoVersion: lines[3], - Main: true, - } - return mod, lines[4] == "go1.14", nil -} - -// WorkspaceVendorEnabled reports whether workspace vendoring is enabled. It takes a *Runner to execute Go commands -// with the supplied context.Context and Invocation. The Invocation can contain pre-defined fields, -// of which only Verb and Args are modified to run the appropriate Go command. -// Inspired by setDefaultBuildMod in modload/init.go -func WorkspaceVendorEnabled(ctx context.Context, inv Invocation, r *Runner) (bool, []*ModuleJSON, error) { - inv.Verb = "env" - inv.Args = []string{"GOWORK"} - stdout, err := r.Run(ctx, inv) - if err != nil { - return false, nil, err - } - goWork := string(bytes.TrimSpace(stdout.Bytes())) - if fi, err := os.Stat(filepath.Join(filepath.Dir(goWork), "vendor")); err == nil && fi.IsDir() { - mainMods, err := getWorkspaceMainModules(ctx, inv, r) - if err != nil { - return false, nil, err - } - return true, mainMods, nil - } - return false, nil, nil -} - -// getWorkspaceMainModules gets the main modules' information. -// This is the information needed to figure out if vendoring should be enabled. -func getWorkspaceMainModules(ctx context.Context, inv Invocation, r *Runner) ([]*ModuleJSON, error) { - const format = `{{.Path}} -{{.Dir}} -{{.GoMod}} -{{.GoVersion}} -` - inv.Verb = "list" - inv.Args = []string{"-m", "-f", format} - stdout, err := r.Run(ctx, inv) - if err != nil { - return nil, err - } - - lines := strings.Split(strings.TrimSuffix(stdout.String(), "\n"), "\n") - if len(lines) < 4 { - return nil, fmt.Errorf("unexpected stdout: %q", stdout.String()) - } - mods := make([]*ModuleJSON, 0, len(lines)/4) - for i := 0; i < len(lines); i += 4 { - mods = append(mods, &ModuleJSON{ - Path: lines[i], - Dir: lines[i+1], - GoMod: lines[i+2], - GoVersion: lines[i+3], - Main: true, - }) - } - return mods, nil -} diff --git a/vendor/golang.org/x/tools/internal/gocommand/version.go b/vendor/golang.org/x/tools/internal/gocommand/version.go deleted file mode 100644 index 446c584..0000000 --- a/vendor/golang.org/x/tools/internal/gocommand/version.go +++ /dev/null @@ -1,71 +0,0 @@ -// Copyright 2020 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package gocommand - -import ( - "context" - "fmt" - "regexp" - "strings" -) - -// GoVersion reports the minor version number of the highest release -// tag built into the go command on the PATH. -// -// Note that this may be higher than the version of the go tool used -// to build this application, and thus the versions of the standard -// go/{scanner,parser,ast,types} packages that are linked into it. -// In that case, callers should either downgrade to the version of -// go used to build the application, or report an error that the -// application is too old to use the go command on the PATH. -func GoVersion(ctx context.Context, inv Invocation, r *Runner) (int, error) { - inv.Verb = "list" - inv.Args = []string{"-e", "-f", `{{context.ReleaseTags}}`, `--`, `unsafe`} - inv.BuildFlags = nil // This is not a build command. - inv.ModFlag = "" - inv.ModFile = "" - inv.Env = append(inv.Env[:len(inv.Env):len(inv.Env)], "GO111MODULE=off") - - stdoutBytes, err := r.Run(ctx, inv) - if err != nil { - return 0, err - } - stdout := stdoutBytes.String() - if len(stdout) < 3 { - return 0, fmt.Errorf("bad ReleaseTags output: %q", stdout) - } - // Split up "[go1.1 go1.15]" and return highest go1.X value. - tags := strings.Fields(stdout[1 : len(stdout)-2]) - for i := len(tags) - 1; i >= 0; i-- { - var version int - if _, err := fmt.Sscanf(tags[i], "go1.%d", &version); err != nil { - continue - } - return version, nil - } - return 0, fmt.Errorf("no parseable ReleaseTags in %v", tags) -} - -// GoVersionOutput returns the complete output of the go version command. -func GoVersionOutput(ctx context.Context, inv Invocation, r *Runner) (string, error) { - inv.Verb = "version" - goVersion, err := r.Run(ctx, inv) - if err != nil { - return "", err - } - return goVersion.String(), nil -} - -// ParseGoVersionOutput extracts the Go version string -// from the output of the "go version" command. -// Given an unrecognized form, it returns an empty string. -func ParseGoVersionOutput(data string) string { - re := regexp.MustCompile(`^go version (go\S+|devel \S+)`) - m := re.FindStringSubmatch(data) - if len(m) != 2 { - return "" // unrecognized version - } - return m[1] -} |