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Commit | Line | Data |
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1 | package module | |
2 | ||
3 | import ( | |
4 | "io" | |
5 | "os" | |
6 | "path/filepath" | |
7 | "strings" | |
8 | ) | |
9 | ||
10 | // copyDir copies the src directory contents into dst. Both directories | |
11 | // should already exist. | |
12 | func copyDir(dst, src string) error { | |
13 | src, err := filepath.EvalSymlinks(src) | |
14 | if err != nil { | |
15 | return err | |
16 | } | |
17 | ||
18 | walkFn := func(path string, info os.FileInfo, err error) error { | |
19 | if err != nil { | |
20 | return err | |
21 | } | |
22 | ||
23 | if path == src { | |
24 | return nil | |
25 | } | |
26 | ||
27 | if strings.HasPrefix(filepath.Base(path), ".") { | |
28 | // Skip any dot files | |
29 | if info.IsDir() { | |
30 | return filepath.SkipDir | |
31 | } else { | |
32 | return nil | |
33 | } | |
34 | } | |
35 | ||
36 | // The "path" has the src prefixed to it. We need to join our | |
37 | // destination with the path without the src on it. | |
38 | dstPath := filepath.Join(dst, path[len(src):]) | |
39 | ||
40 | // we don't want to try and copy the same file over itself. | |
41 | if eq, err := sameFile(path, dstPath); eq { | |
42 | return nil | |
43 | } else if err != nil { | |
44 | return err | |
45 | } | |
46 | ||
47 | // If we have a directory, make that subdirectory, then continue | |
48 | // the walk. | |
49 | if info.IsDir() { | |
50 | if path == filepath.Join(src, dst) { | |
51 | // dst is in src; don't walk it. | |
52 | return nil | |
53 | } | |
54 | ||
55 | if err := os.MkdirAll(dstPath, 0755); err != nil { | |
56 | return err | |
57 | } | |
58 | ||
59 | return nil | |
60 | } | |
61 | ||
62 | // If we have a file, copy the contents. | |
63 | srcF, err := os.Open(path) | |
64 | if err != nil { | |
65 | return err | |
66 | } | |
67 | defer srcF.Close() | |
68 | ||
69 | dstF, err := os.Create(dstPath) | |
70 | if err != nil { | |
71 | return err | |
72 | } | |
73 | defer dstF.Close() | |
74 | ||
75 | if _, err := io.Copy(dstF, srcF); err != nil { | |
76 | return err | |
77 | } | |
78 | ||
79 | // Chmod it | |
80 | return os.Chmod(dstPath, info.Mode()) | |
81 | } | |
82 | ||
83 | return filepath.Walk(src, walkFn) | |
84 | } | |
85 | ||
86 | // sameFile tried to determine if to paths are the same file. | |
87 | // If the paths don't match, we lookup the inode on supported systems. | |
88 | func sameFile(a, b string) (bool, error) { | |
89 | if a == b { | |
90 | return true, nil | |
91 | } | |
92 | ||
93 | aIno, err := inode(a) | |
94 | if err != nil { | |
95 | if os.IsNotExist(err) { | |
96 | return false, nil | |
97 | } | |
98 | return false, err | |
99 | } | |
100 | ||
101 | bIno, err := inode(b) | |
102 | if err != nil { | |
103 | if os.IsNotExist(err) { | |
104 | return false, nil | |
105 | } | |
106 | return false, err | |
107 | } | |
108 | ||
109 | if aIno > 0 && aIno == bIno { | |
110 | return true, nil | |
111 | } | |
112 | ||
113 | return false, nil | |
114 | } |