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util.go
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/
util.go
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package overmount
import (
"os"
"sync"
"golang.org/x/sys/unix"
"github.com/pkg/errors"
)
func edit(lockfile string, mutex *sync.Mutex, editFunc func() error) (retErr error) {
mutex.Lock()
defer mutex.Unlock()
f, err := os.Create(lockfile)
if err != nil {
return err
}
if err := unix.Flock(int(f.Fd()), unix.LOCK_EX|unix.LOCK_NB); err != nil {
return err
}
defer func() {
if err := unix.Flock(int(f.Fd()), unix.LOCK_UN); err != nil {
retErr = errors.Wrap(retErr, err.Error())
}
f.Close()
}()
return editFunc()
}
// checkDir validates the directory is not a symlink and exists.
func checkDir(path string, wrapErr error) error {
fi, err := os.Lstat(path)
if err != nil {
if os.IsNotExist(err) {
if err := os.MkdirAll(path, 0700); err != nil {
return errors.Wrapf(wrapErr, "unable to mkdir: %v", err.Error())
}
return nil
}
return err
}
if !fi.IsDir() {
return errors.Wrap(wrapErr, "not a directory")
}
if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
// here we attempt to remove a whole class of potential bugs.
return errors.Wrap(wrapErr, "cannot operate on a symlink")
}
return nil
}