139 lines
3.4 KiB
Go
139 lines
3.4 KiB
Go
/*
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* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package main
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import (
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"fmt"
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"log"
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"os"
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"path"
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"strconv"
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)
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func cleanPath(loc string, flags int) error {
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if info, _ := os.Lstat(loc); info != nil {
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if info.Mode()&os.ModeSymlink != 0 {
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if flags&flagVerbose != 0 {
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log.Printf("removing symlink: %s", loc)
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}
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if err := os.Remove(loc); err != nil {
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return err
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}
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} else {
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if flags&flagClobber != 0 {
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if flags&flagVerbose != 0 {
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log.Printf("clobbering path: %s", loc)
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}
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if err := os.RemoveAll(loc); err != nil {
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return err
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}
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}
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}
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}
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return nil
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}
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func createPath(loc string, flags int, mode os.FileMode) error {
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if flags&flagForce != 0 {
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parentDir, _ := path.Split(loc)
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if _, err := os.Stat(parentDir); os.IsNotExist(err) {
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if flags&flagVerbose != 0 {
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log.Printf("force creating path: %s", parentDir)
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}
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if err := os.MkdirAll(parentDir, mode); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func parseLink(params []string) (srcPath, dstPath string, mode os.FileMode, err error) {
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length := len(params)
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if length < 1 || length > 3 {
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err = fmt.Errorf("invalid link statement")
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return
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}
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if length > 2 {
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var parsed uint64
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parsed, err = strconv.ParseUint(params[2], 0, 64)
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if err != nil {
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return
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}
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mode = os.FileMode(parsed)
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} else {
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mode = 0755
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}
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dstPath = os.ExpandEnv(params[0])
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srcPath = dstPath
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if length > 1 {
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srcPath = os.ExpandEnv(params[1])
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}
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return
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}
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func processLink(params []string, srcDir, dstDir string, flags int) error {
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srcPath, dstPath, mode, err := parseLink(params)
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if err != nil {
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return err
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}
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srcPathAbs := srcPath
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if !path.IsAbs(srcPathAbs) {
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srcPathAbs = path.Join(srcDir, srcPath)
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}
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dstPathAbs := dstPath
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if !path.IsAbs(dstPathAbs) {
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dstPathAbs = path.Join(dstDir, dstPath)
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}
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if _, err := os.Stat(srcPathAbs); os.IsNotExist(err) {
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return fmt.Errorf("source path %s does not exist in filesystem", srcPathAbs)
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}
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if err := createPath(dstPathAbs, flags, mode); err != nil {
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return err
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}
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if err := cleanPath(dstPathAbs, flags); err != nil {
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return err
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}
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if flags&flagVerbose != 0 {
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log.Printf("linking %s to %s", srcPathAbs, dstPathAbs)
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}
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if err := os.Symlink(srcPathAbs, dstPathAbs); err != nil {
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return err
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}
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return nil
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}
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