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// Copyright 2013 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
// +build !windows
package utils
import (
"fmt"
"os"
"os/user"
"strconv"
"strings"
"github.com/juju/errors"
)
func homeDir(userName string) (string, error) {
u, err := user.Lookup(userName)
if err != nil {
return "", errors.NewUserNotFound(err, "no such user")
}
return u.HomeDir, nil
}
// MoveFile atomically moves the source file to the destination, returning
// whether the file was moved successfully. If the destination already exists,
// it returns an error rather than overwrite it.
//
// On unix systems, an error may occur with a successful move, if the source
// file location cannot be unlinked.
func MoveFile(source, destination string) (bool, error) {
err := os.Link(source, destination)
if err != nil {
return false, err
}
err = os.Remove(source)
if err != nil {
return true, err
}
return true, nil
}
// ReplaceFile atomically replaces the destination file or directory
// with the source. The errors that are returned are identical to
// those returned by os.Rename.
func ReplaceFile(source, destination string) error {
return os.Rename(source, destination)
}
// MakeFileURL returns a file URL if a directory is passed in else it does nothing
func MakeFileURL(in string) string {
if strings.HasPrefix(in, "/") {
return "file://" + in
}
return in
}
// ChownPath sets the uid and gid of path to match that of the user
// specified.
func ChownPath(path, username string) error {
u, err := user.Lookup(username)
if err != nil {
return fmt.Errorf("cannot lookup %q user id: %v", username, err)
}
uid, err := strconv.Atoi(u.Uid)
if err != nil {
return fmt.Errorf("invalid user id %q: %v", u.Uid, err)
}
gid, err := strconv.Atoi(u.Gid)
if err != nil {
return fmt.Errorf("invalid group id %q: %v", u.Gid, err)
}
return os.Chown(path, uid, gid)
}
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