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1 file changed, 124 insertions
copy.go(file creato)
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| 1 | + | /* MIT License | |
| 2 | + | * | |
| 3 | + | * Copyright (c) 2017 Roland Singer [[email protected]] | |
| 4 | + | * | |
| 5 | + | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
| 6 | + | * of this software and associated documentation files (the "Software"), to deal | |
| 7 | + | * in the Software without restriction, including without limitation the rights | |
| 8 | + | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| 9 | + | * copies of the Software, and to permit persons to whom the Software is | |
| 10 | + | * furnished to do so, subject to the following conditions: | |
| 11 | + | * | |
| 12 | + | * The above copyright notice and this permission notice shall be included in all | |
| 13 | + | * copies or substantial portions of the Software. | |
| 14 | + | * | |
| 15 | + | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| 16 | + | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| 17 | + | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| 18 | + | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| 19 | + | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| 20 | + | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
| 21 | + | * SOFTWARE. | |
| 22 | + | */ | |
| 23 | + | ||
| 24 | + | // CopyFile copies the contents of the file named src to the file named | |
| 25 | + | // by dst. The file will be created if it does not already exist. If the | |
| 26 | + | // destination file exists, all it's contents will be replaced by the contents | |
| 27 | + | // of the source file. The file mode will be copied from the source and | |
| 28 | + | // the copied data is synced/flushed to stable storage. | |
| 29 | + | func CopyFile(src, dst string) (err error) { | |
| 30 | + | in, err := os.Open(src) | |
| 31 | + | if err != nil { | |
| 32 | + | return | |
| 33 | + | } | |
| 34 | + | defer in.Close() | |
| 35 | + | ||
| 36 | + | out, err := os.Create(dst) | |
| 37 | + | if err != nil { | |
| 38 | + | return | |
| 39 | + | } | |
| 40 | + | defer func() { | |
| 41 | + | if e := out.Close(); e != nil { | |
| 42 | + | err = e | |
| 43 | + | } | |
| 44 | + | }() | |
| 45 | + | ||
| 46 | + | _, err = io.Copy(out, in) | |
| 47 | + | if err != nil { | |
| 48 | + | return | |
| 49 | + | } | |
| 50 | + | ||
| 51 | + | err = out.Sync() | |
| 52 | + | if err != nil { | |
| 53 | + | return | |
| 54 | + | } | |
| 55 | + | ||
| 56 | + | si, err := os.Stat(src) | |
| 57 | + | if err != nil { | |
| 58 | + | return | |
| 59 | + | } | |
| 60 | + | err = os.Chmod(dst, si.Mode()) | |
| 61 | + | if err != nil { | |
| 62 | + | return | |
| 63 | + | } | |
| 64 | + | ||
| 65 | + | return | |
| 66 | + | } | |
| 67 | + | ||
| 68 | + | // CopyDir recursively copies a directory tree, attempting to preserve permissions. | |
| 69 | + | // Source directory must exist, destination directory must *not* exist. | |
| 70 | + | // Symlinks are ignored and skipped. | |
| 71 | + | func CopyDir(src string, dst string) (err error) { | |
| 72 | + | src = filepath.Clean(src) | |
| 73 | + | dst = filepath.Clean(dst) | |
| 74 | + | ||
| 75 | + | si, err := os.Stat(src) | |
| 76 | + | if err != nil { | |
| 77 | + | return err | |
| 78 | + | } | |
| 79 | + | if !si.IsDir() { | |
| 80 | + | return fmt.Errorf("source is not a directory") | |
| 81 | + | } | |
| 82 | + | ||
| 83 | + | _, err = os.Stat(dst) | |
| 84 | + | if err != nil && !os.IsNotExist(err) { | |
| 85 | + | return | |
| 86 | + | } | |
| 87 | + | if err == nil { | |
| 88 | + | return fmt.Errorf("destination already exists") | |
| 89 | + | } | |
| 90 | + | ||
| 91 | + | err = os.MkdirAll(dst, si.Mode()) | |
| 92 | + | if err != nil { | |
| 93 | + | return | |
| 94 | + | } | |
| 95 | + | ||
| 96 | + | entries, err := ioutil.ReadDir(src) | |
| 97 | + | if err != nil { | |
| 98 | + | return | |
| 99 | + | } | |
| 100 | + | ||
| 101 | + | for _, entry := range entries { | |
| 102 | + | srcPath := filepath.Join(src, entry.Name()) | |
| 103 | + | dstPath := filepath.Join(dst, entry.Name()) | |
| 104 | + | ||
| 105 | + | if entry.IsDir() { | |
| 106 | + | err = CopyDir(srcPath, dstPath) | |
| 107 | + | if err != nil { | |
| 108 | + | return | |
| 109 | + | } | |
| 110 | + | } else { | |
| 111 | + | // Skip symlinks. | |
| 112 | + | if entry.Mode()&os.ModeSymlink != 0 { | |
| 113 | + | continue | |
| 114 | + | } | |
| 115 | + | ||
| 116 | + | err = CopyFile(srcPath, dstPath) | |
| 117 | + | if err != nil { | |
| 118 | + | return | |
| 119 | + | } | |
| 120 | + | } | |
| 121 | + | } | |
| 122 | + | ||
| 123 | + | return | |
| 124 | + | } | |
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