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Closes #114 #114 GitOrigin-RevId: d1f74f7 Change-Id: Idba2820dc60bdfa3acc7c96008228eea1ceabcf9 Reviewed-on: https://cue-review.googlesource.com/c/cue/+/3320 Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| // Copyright 2019 CUE Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| // Package copy provides utilities to copy files and directories. | ||
| package copy | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "io/ioutil" | ||
| "os" | ||
| "path/filepath" | ||
| ) | ||
|
|
||
| // File creates dst and copies the contents src to it. | ||
| func File(src, dst string) error { | ||
| src = filepath.Clean(src) | ||
| dst = filepath.Clean(dst) | ||
|
|
||
| stat, err := os.Stat(src) | ||
| if err != nil { | ||
| return fmt.Errorf("copy file: %v", err) | ||
| } | ||
| err = copyFile(stat, src, dst) | ||
| if err != nil { | ||
| return fmt.Errorf("copy file: %v", err) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Dir copies a src directory to its destination. | ||
| func Dir(src, dst string) error { | ||
| src = filepath.Clean(src) | ||
| dst = filepath.Clean(dst) | ||
|
|
||
| stat, err := os.Stat(src) | ||
| if err != nil { | ||
| return fmt.Errorf("copy failed: %v", err) | ||
| } else if !stat.IsDir() { | ||
| return fmt.Errorf("copy failed: source is not a directory") | ||
| } | ||
|
|
||
| err = copyDir(stat, src, dst) | ||
| if err != nil { | ||
| return fmt.Errorf("copy failed: %v", err) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func copyDir(info os.FileInfo, src, dst string) error { | ||
| if _, err := os.Stat(dst); err != nil { | ||
| if !os.IsNotExist(err) { | ||
| return fmt.Errorf("dest err %s: %v", dst, err) | ||
| } | ||
| if err := os.MkdirAll(dst, info.Mode()); err != nil { | ||
| return fmt.Errorf("making dest %s: %v", dst, err) | ||
| } | ||
| } | ||
|
|
||
| entries, err := ioutil.ReadDir(src) | ||
| if err != nil { | ||
| return fmt.Errorf("reading dir %s: %v", src, err) | ||
| } | ||
|
|
||
| for _, e := range entries { | ||
| srcPath := filepath.Join(src, e.Name()) | ||
| dstPath := filepath.Join(dst, e.Name()) | ||
|
|
||
| switch mode := e.Mode(); mode & os.ModeType { | ||
| case os.ModeSymlink: | ||
| err = copySymLink(e, srcPath, dstPath) | ||
| case os.ModeDir: | ||
| err = copyDir(e, srcPath, dstPath) | ||
| default: | ||
| err = copyFile(e, srcPath, dstPath) | ||
| } | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func copySymLink(info os.FileInfo, src, dst string) error { | ||
| mode := info.Mode() | ||
| link, err := os.Readlink(src) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| err = os.Symlink(link, dst) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return os.Chmod(dst, mode) | ||
| } | ||
|
|
||
| func copyFile(info os.FileInfo, src, dst string) (err error) { | ||
| in, err := os.Open(src) | ||
| if err != nil { | ||
| return fmt.Errorf("error reading %s: %v", src, err) | ||
| } | ||
| defer in.Close() | ||
|
|
||
| out, err := os.OpenFile(dst, os.O_RDWR|os.O_CREATE|os.O_TRUNC, info.Mode()) | ||
| if err != nil { | ||
| return fmt.Errorf("error creating %s: %v", dst, err) | ||
| } | ||
| defer func() { | ||
| cErr := out.Close() | ||
| if err == nil { | ||
| err = cErr | ||
| } | ||
| }() | ||
|
|
||
| _, err = io.Copy(out, in) | ||
| if err != nil { | ||
| return fmt.Errorf("error copying %s: %v", dst, err) | ||
| } | ||
| return err | ||
| } |