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go/build: bypass importGo if srcDir is in GOROOT/src

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This fixes the builder flake observed in
https://build.golang.org/log/84fe80f8f091b9cef639b3ae2422a673f1462810,
which could be replicated by running

	GOPROXY=off GOPATH=$(mktemp -d) go test go/internal/srcimporter

Updates #30228
Fixes #30760

Change-Id: Ibf8b7a2e211611960b074b74af91acd4f0196edb
Reviewed-on: https://go-review.googlesource.com/c/go/+/166977
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
This commit is contained in:
Bryan C. Mills 2019-03-11 17:25:09 -04:00
parent 8b2a2d0394
commit 9fedec79ed
1 changed files with 13 additions and 0 deletions
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13
src/go/build/build.go
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@ -1002,6 +1002,7 @@ func (ctxt *Context) importGo(p *Package, path, srcDir string, mode ImportMode,
}
// If modules are not enabled, then the in-process code works fine and we should keep using it.
// TODO(bcmills): This assumes that the default is "auto" instead of "on".
switch os.Getenv("GO111MODULE") {
case "off":
return errNoModules
@ -1017,6 +1018,13 @@ func (ctxt *Context) importGo(p *Package, path, srcDir string, mode ImportMode,
}
}
// If the source directory is in GOROOT, then the in-process code works fine
// and we should keep using it. Moreover, the 'go list' approach below doesn't
// take standard-library vendoring into account and will fail.
if _, ok := ctxt.hasSubdir(filepath.Join(ctxt.GOROOT, "src"), srcDir); ok {
return errNoModules
}
// For efficiency, if path is a standard library package, let the usual lookup code handle it.
if ctxt.GOROOT != "" {
dir := ctxt.joinPath(ctxt.GOROOT, "src", path)
@ -1043,7 +1051,12 @@ func (ctxt *Context) importGo(p *Package, path, srcDir string, mode ImportMode,
}
cmd := exec.Command("go", "list", "-compiler="+ctxt.Compiler, "-tags="+strings.Join(ctxt.BuildTags, ","), "-installsuffix="+ctxt.InstallSuffix, "-f={{.Dir}}\n{{.ImportPath}}\n{{.Root}}\n{{.Goroot}}\n", path)
// TODO(bcmills): This is wrong if srcDir is in a vendor directory, or if
// srcDir is in some module dependency of the main module. The main module
// chooses what the import paths mean: individual packages don't.
cmd.Dir = srcDir
var stdout, stderr strings.Builder
cmd.Stdout = &stdout
cmd.Stderr = &stderr