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cmd/godoc: don't execute go list -m all when GOMOD is /dev/null

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When the GOMOD value is the operating system's null device, there
isn't a main module. Return an empty build list right away, since
running 'go list -m all' in Go 1.14 will cause a "cannot match "all":
working directory is not part of a module" error.

Fixes golang/go#35690
Updates golang/go#35728

Change-Id: I024ca3b7d774835140ce4a1625133aff6554a533
Reviewed-on: https://go-review.googlesource.com/c/tools/+/208258
Reviewed-by: Bryan C. Mills <bcmills@google.com>
This commit is contained in:
Dmitri Shuralyov 2019-11-20 23:33:35 -05:00
parent eaeb383209
commit 91381dc0ae
2 changed files with 8 additions and 3 deletions
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2
cmd/godoc/godoc_test.go
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@ -473,7 +473,7 @@ func TestNoMainModule(t *testing.T) {
cmd.Stderr = &stderr
err = cmd.Run()
if err != nil {
t.Fatal(err)
t.Fatalf("godoc command failed: %v\nstderr=%q", err, stderr.String())
}
if strings.Contains(stderr.String(), "go mod download") {
t.Errorf("stderr contains 'go mod download', is that intentional?\nstderr=%q", stderr.String())

9
cmd/godoc/main.go
View File

@ -222,7 +222,7 @@ func main() {
fillModuleCache(os.Stderr, goModFile)
// Determine modules in the build list.
mods, err := buildList()
mods, err := buildList(goModFile)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to determine the build list of the main module: %v", err)
os.Exit(1)
@ -456,7 +456,12 @@ func fillModuleCache(w io.Writer, goMod string) {
// in module mode.
//
// See https://golang.org/cmd/go/#hdr-The_main_module_and_the_build_list.
func buildList() ([]mod, error) {
func buildList(goMod string) ([]mod, error) {
if goMod == os.DevNull {
// Empty build list.
return nil, nil
}
out, err := exec.Command("go", "list", "-m", "-json", "all").Output()
if ee := (*exec.ExitError)(nil); xerrors.As(err, &ee) {
return nil, fmt.Errorf("go command exited unsuccessfully: %v\n%s", ee.ProcessState.String(), ee.Stderr)