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go/packages: work around go list behavior for missing dependencies

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If go/packages.Load tries to load a package with a missing dependency, it
should not return an error, but a package with an error set on it.  This is a
workaround for go list -e -compiled (or even just go list -e) returning a
non-zero exit status for packages with missing dependencies.

Change-Id: I2d7d848ae5133235f595baf7b30296077e891ee3
Reviewed-on: https://go-review.googlesource.com/c/tools/+/170891
Run-TryBot: Michael Matloob <matloob@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Cottrell <iancottrell@google.com>
This commit is contained in:
Michael Matloob 2019-04-05 15:22:56 -04:00
parent 7be61e1b0e
commit 1a7b4747f5
2 changed files with 38 additions and 0 deletions
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16
go/packages/golist.go
View File

@ -777,6 +777,22 @@ func invokeGo(cfg *Config, args ...string) (*bytes.Buffer, error) {
return bytes.NewBufferString(output), nil
}
// Workaround for an instance of golang.org/issue/26755: go list -e will return a non-zero exit
// status if there's a dependency on a package that doesn't exist. But it should return
// a zero exit status and set an error on that package.
if len(stderr.String()) > 0 && strings.Contains(stderr.String(), "no Go files in") {
// try to extract package name from string
stderrStr := stderr.String()
var importPath string
colon := strings.Index(stderrStr, ":")
if colon > 0 && strings.HasPrefix(stderrStr, "go build ") {
importPath = stderrStr[len("go build "):colon]
}
output := fmt.Sprintf(`{"ImportPath": %q,"Incomplete": true,"Error": {"Pos": "","Err": %q}}`,
importPath, strings.Trim(stderrStr, "\n"))
return bytes.NewBufferString(output), nil
}
// Export mode entails a build.
// If that build fails, errors appear on stderr
// (despite the -e flag) and the Export field is blank.

22
go/packages/packages_test.go
View File

@ -1828,6 +1828,28 @@ func testReturnErrorWhenUsingNonGoFiles(t *testing.T, exporter packagestest.Expo
}
}
func TestMissingDependency(t *testing.T) { packagestest.TestAll(t, testMissingDependency) }
func testMissingDependency(t *testing.T, exporter packagestest.Exporter) {
exported := packagestest.Export(t, exporter, []packagestest.Module{{
Name: "golang.org/fake",
Files: map[string]interface{}{
"a/a.go": `package a; import _ "this/package/doesnt/exist"`,
}}})
defer exported.Cleanup()
exported.Config.Mode = packages.LoadAllSyntax
pkgs, err := packages.Load(exported.Config, "golang.org/fake/a")
if err != nil {
t.Fatal(err)
}
if len(pkgs) != 1 && pkgs[0].PkgPath != "golang.org/fake/a" {
t.Fatalf("packages.Load: want [golang.org/fake/a], got %v", pkgs)
}
if len(pkgs[0].Errors) == 0 {
t.Errorf("result of Load: want package with errors, got none: %+v", pkgs[0])
}
}
func errorMessages(errors []packages.Error) []string {
var msgs []string
for _, err := range errors {