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go/packages: fix flaky failure creating non-test package from overlay

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The core of processGolistOverlay was a map iteration, which is
nondeterministic. When creating both a non-test and test package, we
would sometimes encounter the test file before the non-test file. In
that case, for reasons I didn't bother tracking down, we would never
create the non-test package.

Rather than doing complicated bookkeeping to fix the problem, simply
process non-test before test, and make the loop deterministic to save
all of our sanity.

Updates golang/go#36661.

Change-Id: I1f76869fa52794ac8ae96e22ad06a2b1e1861995
Reviewed-on: https://go-review.googlesource.com/c/tools/+/216717
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Heschi Kreinick 2020-01-28 15:57:23 -05:00 committed by Rebecca Stambler
parent ae42f3cd5c
commit 520188d60f
2 changed files with 46 additions and 1 deletions
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20
go/packages/golist_overlay.go
View File

@ -7,6 +7,7 @@ import (
"go/token"
"os"
"path/filepath"
"sort"
"strconv"
"strings"
)
@ -34,7 +35,24 @@ func (state *golistState) processGolistOverlay(response *responseDeduper) (modif
// potentially modifying the transitive set of dependencies).
var overlayAddsImports bool
for opath, contents := range state.cfg.Overlay {
// If both a package and its test package are created by the overlay, we
// need the real package first. Process all non-test files before test
// files, and make the whole process deterministic while we're at it.
var overlayFiles []string
for opath := range state.cfg.Overlay {
overlayFiles = append(overlayFiles, opath)
}
sort.Slice(overlayFiles, func(i, j int) bool {
iTest := strings.HasSuffix(overlayFiles[i], "_test.go")
jTest := strings.HasSuffix(overlayFiles[j], "_test.go")
if iTest != jTest {
return !iTest // non-tests are before tests.
}
return overlayFiles[i] < overlayFiles[j]
})
for _, opath := range overlayFiles {
contents := state.cfg.Overlay[opath]
base := filepath.Base(opath)
dir := filepath.Dir(opath)
var pkg *Package // if opath belongs to both a package and its test variant, this will be the test variant

27
go/packages/packages_test.go
View File

@ -1104,6 +1104,33 @@ func testNewPackagesInOverlay(t *testing.T, exporter packagestest.Exporter) {
}
}
// Test that we can create a package and its test package in an overlay.
func TestOverlayNewPackageAndTest(t *testing.T) { packagestest.TestAll(t, testOverlayNewPackageAndTest) }
func testOverlayNewPackageAndTest(t *testing.T, exporter packagestest.Exporter) {
exported := packagestest.Export(t, exporter, []packagestest.Module{
{
Name: "golang.org/fake",
Files: map[string]interface{}{
"foo.txt": "placeholder",
},
},
})
defer exported.Cleanup()
dir := filepath.Dir(exported.File("golang.org/fake", "foo.txt"))
exported.Config.Overlay = map[string][]byte{
filepath.Join(dir, "a.go"): []byte(`package a;`),
filepath.Join(dir, "a_test.go"): []byte(`package a; import "testing";`),
}
initial, err := packages.Load(exported.Config, "file="+filepath.Join(dir, "a.go"), "file="+filepath.Join(dir, "a_test.go"))
if err != nil {
t.Fatal(err)
}
if len(initial) != 2 {
t.Errorf("got %v packages, wanted %v", len(initial), 2)
}
}
func TestAdHocPackagesBadImport(t *testing.T) {
// This test doesn't use packagestest because we are testing ad-hoc packages,
// which are outside of $GOPATH and outside of a module.