homemaker/link.go

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