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cmd/go/internal/modfetch/codehost: remove invariantly-empty return value from Repo.ReadZip

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Previously, codehost.Repo.ReadZip returned an 'actualSubdir' value
that was the empty string in all current implementations.

Updates #26092

Change-Id: I6708dd0f13ba88bcf1a1fb405e9d818fd6f9197e
Reviewed-on: https://go-review.googlesource.com/c/go/+/203277
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 2019-10-24 15:17:16 -04:00
parent c357b363cf
commit 680ed10c91
6 changed files with 26 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
src/cmd/go/internal/modfetch/codehost/codehost.go
View File

@ -73,11 +73,10 @@ type Repo interface {
// ReadZip downloads a zip file for the subdir subdirectory
// of the given revision to a new file in a given temporary directory.
// It should refuse to read more than maxSize bytes.
// It returns a ReadCloser for a streamed copy of the zip file,
// along with the actual subdirectory (possibly shorter than subdir)
// contained in the zip file. All files in the zip file are expected to be
// It returns a ReadCloser for a streamed copy of the zip file.
// All files in the zip file are expected to be
// nested in a single top-level directory, whose name is not specified.
ReadZip(rev, subdir string, maxSize int64) (zip io.ReadCloser, actualSubdir string, err error)
ReadZip(rev, subdir string, maxSize int64) (zip io.ReadCloser, err error)
// RecentTag returns the most recent tag on rev or one of its predecessors
// with the given prefix and major version.

14
src/cmd/go/internal/modfetch/codehost/git.go
View File

@ -795,7 +795,7 @@ func (r *gitRepo) DescendsFrom(rev, tag string) (bool, error) {
return false, err
}
func (r *gitRepo) ReadZip(rev, subdir string, maxSize int64) (zip io.ReadCloser, actualSubdir string, err error) {
func (r *gitRepo) ReadZip(rev, subdir string, maxSize int64) (zip io.ReadCloser, err error) {
// TODO: Use maxSize or drop it.
args := []string{}
if subdir != "" {
@ -803,17 +803,17 @@ func (r *gitRepo) ReadZip(rev, subdir string, maxSize int64) (zip io.ReadCloser,
}
info, err := r.Stat(rev) // download rev into local git repo
if err != nil {
return nil, "", err
return nil, err
}
unlock, err := r.mu.Lock()
if err != nil {
return nil, "", err
return nil, err
}
defer unlock()
if err := ensureGitAttributes(r.dir); err != nil {
return nil, "", err
return nil, err
}
// Incredibly, git produces different archives depending on whether
@ -824,12 +824,12 @@ func (r *gitRepo) ReadZip(rev, subdir string, maxSize int64) (zip io.ReadCloser,
archive, err := Run(r.dir, "git", "-c", "core.autocrlf=input", "-c", "core.eol=lf", "archive", "--format=zip", "--prefix=prefix/", info.Name, args)
if err != nil {
if bytes.Contains(err.(*RunError).Stderr, []byte("did not match any files")) {
return nil, "", os.ErrNotExist
return nil, os.ErrNotExist
}
return nil, "", err
return nil, err
}
return ioutil.NopCloser(bytes.NewReader(archive)), "", nil
return ioutil.NopCloser(bytes.NewReader(archive)), nil
}
// ensureGitAttributes makes sure export-subst and export-ignore features are

6
src/cmd/go/internal/modfetch/codehost/git_test.go
View File

@ -249,7 +249,6 @@ var readZipTests = []struct {
repo string
rev string
subdir string
actualSubdir string
err string
files map[string]uint64
}{
@ -408,7 +407,7 @@ func TestReadZip(t *testing.T) {
if err != nil {
t.Fatal(err)
}
rc, actualSubdir, err := r.ReadZip(tt.rev, tt.subdir, 100000)
rc, err := r.ReadZip(tt.rev, tt.subdir, 100000)
if err != nil {
if tt.err == "" {
t.Fatalf("ReadZip: unexpected error %v", err)
@ -425,9 +424,6 @@ func TestReadZip(t *testing.T) {
if tt.err != "" {
t.Fatalf("ReadZip: no error, wanted %v", tt.err)
}
if actualSubdir != tt.actualSubdir {
t.Fatalf("ReadZip: actualSubdir = %q, want %q", actualSubdir, tt.actualSubdir)
}
zipdata, err := ioutil.ReadAll(rc)
if err != nil {
t.Fatal(err)

2
src/cmd/go/internal/modfetch/codehost/shell.go
View File

@ -109,7 +109,7 @@ func main() {
if subdir == "-" {
subdir = ""
}
rc, _, err := repo.ReadZip(f[1], subdir, 10<<20)
rc, err := repo.ReadZip(f[1], subdir, 10<<20)
if err != nil {
fmt.Fprintf(os.Stderr, "?%s\n", err)
continue

12
src/cmd/go/internal/modfetch/codehost/vcs.go
View File

@ -417,14 +417,14 @@ func (r *vcsRepo) DescendsFrom(rev, tag string) (bool, error) {
return false, vcsErrorf("DescendsFrom not implemented")
}
func (r *vcsRepo) ReadZip(rev, subdir string, maxSize int64) (zip io.ReadCloser, actualSubdir string, err error) {
func (r *vcsRepo) ReadZip(rev, subdir string, maxSize int64) (zip io.ReadCloser, err error) {
if r.cmd.readZip == nil {
return nil, "", vcsErrorf("ReadZip not implemented for %s", r.cmd.vcs)
return nil, vcsErrorf("ReadZip not implemented for %s", r.cmd.vcs)
}
unlock, err := r.mu.Lock()
if err != nil {
return nil, "", err
return nil, err
}
defer unlock()
@ -433,7 +433,7 @@ func (r *vcsRepo) ReadZip(rev, subdir string, maxSize int64) (zip io.ReadCloser,
}
f, err := ioutil.TempFile("", "go-readzip-*.zip")
if err != nil {
return nil, "", err
return nil, err
}
if r.cmd.vcs == "fossil" {
// If you run
@ -454,9 +454,9 @@ func (r *vcsRepo) ReadZip(rev, subdir string, maxSize int64) (zip io.ReadCloser,
if err != nil {
f.Close()
os.Remove(f.Name())
return nil, "", err
return nil, err
}
return &deleteCloser{f}, "", nil
return &deleteCloser{f}, nil
}
// deleteCloser is a file that gets deleted on Close.

9
src/cmd/go/internal/modfetch/coderepo.go
View File

@ -780,19 +780,16 @@ func (r *codeRepo) Zip(dst io.Writer, version string) error {
}
}
rev, dir, _, err := r.findDir(version)
rev, subdir, _, err := r.findDir(version)
if err != nil {
return err
}
dl, actualDir, err := r.code.ReadZip(rev, dir, codehost.MaxZipFile)
dl, err := r.code.ReadZip(rev, subdir, codehost.MaxZipFile)
if err != nil {
return err
}
defer dl.Close()
if actualDir != "" && !hasPathPrefix(dir, actualDir) {
return fmt.Errorf("internal error: downloading %v %v: dir=%q but actualDir=%q", r.modPath, rev, dir, actualDir)
}
subdir := strings.Trim(strings.TrimPrefix(dir, actualDir), "/")
subdir = strings.Trim(subdir, "/")
// Spool to local file.
f, err := ioutil.TempFile("", "go-codehost-")