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cmd/go/internal/modfetch: make directories read-only after renaming, not before

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The call to os.Rename was failing on the darwin builders, despite having passed in the TryBots.
(I tested this change by running 'go test cmd/go' manually on a darwin gomote.)

This fixes the builder failures after CL 146382.

Updates #26794
Fixes #29030

Change-Id: I3644773421789f65e56f183d077b4e4fd17b8325
Reviewed-on: https://go-review.googlesource.com/c/151798
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Bryan C. Mills 2018-11-29 17:46:14 -05:00
parent 96a6bd4bf6
commit 42e8b9c3a4
2 changed files with 31 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

@ -120,7 +120,14 @@ func download(mod module.Version, dir string) (err error) {
return err
}
return os.Rename(tmpDir, dir)
if err := os.Rename(tmpDir, dir); err != nil {
return err
}
// Make dir read-only only *after* renaming it.
// os.Rename was observed to fail for read-only directories on macOS.
makeDirsReadOnly(dir)
return nil
}
var downloadZipCache par.Cache

42
src/cmd/go/internal/modfetch/unzip.go
View File

@ -12,7 +12,6 @@ import (
"os"
"path"
"path/filepath"
"sort"
"strings"
"cmd/go/internal/modfetch/codehost"
@ -98,18 +97,12 @@ func Unzip(dir, zipfile, prefix string, maxSize int64) error {
}
// Unzip, enforcing sizes checked earlier.
dirs := map[string]bool{dir: true}
for _, zf := range z.File {
if zf.Name == prefix || strings.HasSuffix(zf.Name, "/") {
continue
}
name := zf.Name[len(prefix):]
dst := filepath.Join(dir, name)
parent := filepath.Dir(dst)
for parent != dir {
dirs[parent] = true
parent = filepath.Dir(parent)
}
if err := os.MkdirAll(filepath.Dir(dst), 0777); err != nil {
return err
}
@ -137,21 +130,32 @@ func Unzip(dir, zipfile, prefix string, maxSize int64) error {
}
}
// Mark directories unwritable, best effort.
var dirlist []string
for dir := range dirs {
dirlist = append(dirlist, dir)
}
sort.Strings(dirlist)
// Run over list backward to chmod children before parents.
for i := len(dirlist) - 1; i >= 0; i-- {
// TODO(bcmills): Does this end up stomping on the umask of the cache directory?
os.Chmod(dirlist[i], 0555)
}
return nil
}
// makeDirsReadOnly makes a best-effort attempt to remove write permissions for dir
// and its transitive contents.
func makeDirsReadOnly(dir string) {
type pathMode struct {
path string
mode os.FileMode
}
var dirs []pathMode // in lexical order
filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if err == nil && info.Mode()&0222 != 0 {
if info.IsDir() {
dirs = append(dirs, pathMode{path, info.Mode()})
}
}
return nil
})
// Run over list backward to chmod children before parents.
for i := len(dirs) - 1; i >= 0; i-- {
os.Chmod(dirs[i].path, dirs[i].mode&^0222)
}
}
// RemoveAll removes a directory written by Download or Unzip, first applying
// any permission changes needed to do so.
func RemoveAll(dir string) error {