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alloc_dir_posix.go
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/
alloc_dir_posix.go
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// +build !windows
// Functions shared between linux/darwin.
package allocdir
import (
"fmt"
"os"
"os/user"
"strconv"
"syscall"
)
func (d *AllocDir) linkOrCopy(src, dst string, perm os.FileMode) error {
// Attempt to hardlink.
if err := os.Link(src, dst); err == nil {
return nil
}
return fileCopy(src, dst, perm)
}
func (d *AllocDir) dropDirPermissions(path string) error {
// Can't do anything if not root.
if syscall.Geteuid() != 0 {
return nil
}
u, err := user.Lookup("nobody")
if err != nil {
return err
}
uid, err := getUid(u)
if err != nil {
return err
}
gid, err := getGid(u)
if err != nil {
return err
}
if err := os.Chown(path, uid, gid); err != nil {
return fmt.Errorf("Couldn't change owner/group of %v to (uid: %v, gid: %v): %v", path, uid, gid, err)
}
if err := os.Chmod(path, 0777); err != nil {
return fmt.Errorf("Chmod(%v) failed: %v", path, err)
}
return nil
}
func getUid(u *user.User) (int, error) {
uid, err := strconv.Atoi(u.Uid)
if err != nil {
return 0, fmt.Errorf("Unable to convert Uid to an int: %v", err)
}
return uid, nil
}
func getGid(u *user.User) (int, error) {
gid, err := strconv.Atoi(u.Gid)
if err != nil {
return 0, fmt.Errorf("Unable to convert Gid to an int: %v", err)
}
return gid, nil
}