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package executor
import (
"context"
"errors"
"os"
"path/filepath"
"strings"
"syscall"
"github.com/containerd/continuity/fs"
"github.com/moby/buildkit/util/bklog"
"github.com/moby/buildkit/util/system"
)
func MountStubsCleaner(ctx context.Context, dir string, mounts []Mount, recursive bool) func() {
names := []string{"/etc/resolv.conf", "/etc/hosts"}
for _, m := range mounts {
names = append(names, m.Dest)
}
paths := make([]string, 0, len(names))
for _, p := range names {
p = filepath.Join("/", p)
if p == "/" {
continue
}
realPath, err := fs.RootPath(dir, p)
if err != nil {
continue
}
for {
_, err = os.Lstat(realPath)
if !(errors.Is(err, os.ErrNotExist) || errors.Is(err, syscall.ENOTDIR)) {
break
}
paths = append(paths, realPath)
if !recursive {
break
}
realPathNext := filepath.Dir(realPath)
if realPath == realPathNext || realPathNext == dir {
break
}
realPath = realPathNext
}
}
return func() {
for _, p := range paths {
p, err := fs.RootPath(dir, strings.TrimPrefix(p, dir))
if err != nil {
continue
}
st, err := os.Lstat(p)
if err != nil {
continue
}
if st.IsDir() {
entries, err := os.ReadDir(p)
if err != nil {
continue
}
if len(entries) != 0 {
continue
}
} else if st.Size() != 0 {
continue
}
// Back up the timestamps of the dir for reproducible builds
// https://github.com/moby/buildkit/issues/3148
parent := filepath.Dir(p)
if realPath, err := fs.RootPath(dir, strings.TrimPrefix(parent, dir)); err != nil || realPath != parent {
continue
}
dirSt, err := os.Stat(parent)
if err != nil {
bklog.G(ctx).WithError(err).Warnf("Failed to stat %q (parent of mount stub %q)", dir, p)
continue
}
mtime := dirSt.ModTime()
atime, err := system.Atime(dirSt)
if err != nil {
bklog.G(ctx).WithError(err).Warnf("Failed to stat atime of %q (parent of mount stub %q)", dir, p)
atime = mtime
}
if err := os.Remove(p); err != nil {
bklog.G(ctx).WithError(err).Warnf("Failed to remove mount stub %q", p)
}
// Restore the timestamps of the dir
if err := os.Chtimes(parent, atime, mtime); err != nil {
bklog.G(ctx).WithError(err).Warnf("Failed to restore time time mount stub timestamp (os.Chtimes(%q, %v, %v))", dir, atime, mtime)
}
}
}
}
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