author | Mikael Berthe <mikael@lilotux.net> |
Sat, 29 Sep 2018 18:09:54 +0200 | |
changeset 242 | 2a9ec03fe5a1 |
child 251 | 1c52a0eeb952 |
permissions | -rw-r--r-- |
242
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1 |
package afero |
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2 |
|
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3 |
import ( |
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4 |
"io" |
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5 |
"os" |
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6 |
"path/filepath" |
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7 |
"syscall" |
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8 |
) |
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9 |
|
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10 |
// The UnionFile implements the afero.File interface and will be returned |
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11 |
// when reading a directory present at least in the overlay or opening a file |
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12 |
// for writing. |
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13 |
// |
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14 |
// The calls to |
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15 |
// Readdir() and Readdirnames() merge the file os.FileInfo / names from the |
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16 |
// base and the overlay - for files present in both layers, only those |
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17 |
// from the overlay will be used. |
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18 |
// |
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19 |
// When opening files for writing (Create() / OpenFile() with the right flags) |
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20 |
// the operations will be done in both layers, starting with the overlay. A |
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21 |
// successful read in the overlay will move the cursor position in the base layer |
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22 |
// by the number of bytes read. |
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23 |
type UnionFile struct { |
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24 |
Base File |
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25 |
Layer File |
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26 |
Merger DirsMerger |
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27 |
off int |
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28 |
files []os.FileInfo |
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29 |
} |
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30 |
|
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31 |
func (f *UnionFile) Close() error { |
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32 |
// first close base, so we have a newer timestamp in the overlay. If we'd close |
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33 |
// the overlay first, we'd get a cacheStale the next time we access this file |
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34 |
// -> cache would be useless ;-) |
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35 |
if f.Base != nil { |
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36 |
f.Base.Close() |
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37 |
} |
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38 |
if f.Layer != nil { |
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39 |
return f.Layer.Close() |
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40 |
} |
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41 |
return BADFD |
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42 |
} |
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43 |
|
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44 |
func (f *UnionFile) Read(s []byte) (int, error) { |
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45 |
if f.Layer != nil { |
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46 |
n, err := f.Layer.Read(s) |
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47 |
if (err == nil || err == io.EOF) && f.Base != nil { |
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48 |
// advance the file position also in the base file, the next |
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49 |
// call may be a write at this position (or a seek with SEEK_CUR) |
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50 |
if _, seekErr := f.Base.Seek(int64(n), os.SEEK_CUR); seekErr != nil { |
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51 |
// only overwrite err in case the seek fails: we need to |
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52 |
// report an eventual io.EOF to the caller |
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53 |
err = seekErr |
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54 |
} |
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55 |
} |
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56 |
return n, err |
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57 |
} |
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58 |
if f.Base != nil { |
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59 |
return f.Base.Read(s) |
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60 |
} |
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61 |
return 0, BADFD |
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62 |
} |
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63 |
|
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64 |
func (f *UnionFile) ReadAt(s []byte, o int64) (int, error) { |
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65 |
if f.Layer != nil { |
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66 |
n, err := f.Layer.ReadAt(s, o) |
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67 |
if (err == nil || err == io.EOF) && f.Base != nil { |
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68 |
_, err = f.Base.Seek(o+int64(n), os.SEEK_SET) |
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69 |
} |
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70 |
return n, err |
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71 |
} |
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72 |
if f.Base != nil { |
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73 |
return f.Base.ReadAt(s, o) |
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74 |
} |
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75 |
return 0, BADFD |
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76 |
} |
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77 |
|
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78 |
func (f *UnionFile) Seek(o int64, w int) (pos int64, err error) { |
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79 |
if f.Layer != nil { |
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80 |
pos, err = f.Layer.Seek(o, w) |
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81 |
if (err == nil || err == io.EOF) && f.Base != nil { |
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82 |
_, err = f.Base.Seek(o, w) |
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83 |
} |
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84 |
return pos, err |
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85 |
} |
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86 |
if f.Base != nil { |
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87 |
return f.Base.Seek(o, w) |
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88 |
} |
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89 |
return 0, BADFD |
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90 |
} |
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91 |
|
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92 |
func (f *UnionFile) Write(s []byte) (n int, err error) { |
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93 |
if f.Layer != nil { |
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94 |
n, err = f.Layer.Write(s) |
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95 |
if err == nil && f.Base != nil { // hmm, do we have fixed size files where a write may hit the EOF mark? |
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96 |
_, err = f.Base.Write(s) |
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97 |
} |
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98 |
return n, err |
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99 |
} |
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100 |
if f.Base != nil { |
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101 |
return f.Base.Write(s) |
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102 |
} |
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103 |
return 0, BADFD |
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104 |
} |
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105 |
|
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106 |
func (f *UnionFile) WriteAt(s []byte, o int64) (n int, err error) { |
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107 |
if f.Layer != nil { |
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108 |
n, err = f.Layer.WriteAt(s, o) |
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109 |
if err == nil && f.Base != nil { |
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110 |
_, err = f.Base.WriteAt(s, o) |
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111 |
} |
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112 |
return n, err |
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113 |
} |
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114 |
if f.Base != nil { |
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115 |
return f.Base.WriteAt(s, o) |
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116 |
} |
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117 |
return 0, BADFD |
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118 |
} |
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119 |
|
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120 |
func (f *UnionFile) Name() string { |
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121 |
if f.Layer != nil { |
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122 |
return f.Layer.Name() |
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123 |
} |
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|
124 |
return f.Base.Name() |
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|
125 |
} |
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|
126 |
|
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|
127 |
// DirsMerger is how UnionFile weaves two directories together. |
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|
128 |
// It takes the FileInfo slices from the layer and the base and returns a |
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|
129 |
// single view. |
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|
130 |
type DirsMerger func(lofi, bofi []os.FileInfo) ([]os.FileInfo, error) |
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|
131 |
|
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|
132 |
var defaultUnionMergeDirsFn = func(lofi, bofi []os.FileInfo) ([]os.FileInfo, error) { |
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|
133 |
var files = make(map[string]os.FileInfo) |
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|
134 |
|
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|
135 |
for _, fi := range lofi { |
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|
136 |
files[fi.Name()] = fi |
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|
137 |
} |
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changeset
|
138 |
|
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|
139 |
for _, fi := range bofi { |
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|
140 |
if _, exists := files[fi.Name()]; !exists { |
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|
141 |
files[fi.Name()] = fi |
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|
142 |
} |
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changeset
|
143 |
} |
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changeset
|
144 |
|
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|
145 |
rfi := make([]os.FileInfo, len(files)) |
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changeset
|
146 |
|
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|
147 |
i := 0 |
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|
148 |
for _, fi := range files { |
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|
149 |
rfi[i] = fi |
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|
150 |
i++ |
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|
151 |
} |
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|
152 |
|
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|
153 |
return rfi, nil |
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|
154 |
|
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|
155 |
} |
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|
156 |
|
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|
157 |
// Readdir will weave the two directories together and |
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|
158 |
// return a single view of the overlayed directories |
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|
159 |
func (f *UnionFile) Readdir(c int) (ofi []os.FileInfo, err error) { |
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|
160 |
var merge DirsMerger = f.Merger |
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|
161 |
if merge == nil { |
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changeset
|
162 |
merge = defaultUnionMergeDirsFn |
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|
163 |
} |
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changeset
|
164 |
|
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changeset
|
165 |
if f.off == 0 { |
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|
166 |
var lfi []os.FileInfo |
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|
167 |
if f.Layer != nil { |
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|
168 |
lfi, err = f.Layer.Readdir(-1) |
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changeset
|
169 |
if err != nil { |
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|
170 |
return nil, err |
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|
171 |
} |
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changeset
|
172 |
} |
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changeset
|
173 |
|
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|
174 |
var bfi []os.FileInfo |
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|
175 |
if f.Base != nil { |
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|
176 |
bfi, err = f.Base.Readdir(-1) |
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changeset
|
177 |
if err != nil { |
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|
178 |
return nil, err |
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changeset
|
179 |
} |
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changeset
|
180 |
|
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changeset
|
181 |
} |
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parents:
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changeset
|
182 |
merged, err := merge(lfi, bfi) |
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parents:
diff
changeset
|
183 |
if err != nil { |
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diff
changeset
|
184 |
return nil, err |
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parents:
diff
changeset
|
185 |
} |
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changeset
|
186 |
f.files = append(f.files, merged...) |
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diff
changeset
|
187 |
} |
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changeset
|
188 |
if c == -1 { |
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parents:
diff
changeset
|
189 |
return f.files[f.off:], nil |
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parents:
diff
changeset
|
190 |
} |
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
191 |
defer func() { f.off += c }() |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
diff
changeset
|
192 |
return f.files[f.off:c], nil |
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parents:
diff
changeset
|
193 |
} |
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parents:
diff
changeset
|
194 |
|
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
195 |
func (f *UnionFile) Readdirnames(c int) ([]string, error) { |
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parents:
diff
changeset
|
196 |
rfi, err := f.Readdir(c) |
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parents:
diff
changeset
|
197 |
if err != nil { |
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parents:
diff
changeset
|
198 |
return nil, err |
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parents:
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changeset
|
199 |
} |
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Mikael Berthe <mikael@lilotux.net>
parents:
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changeset
|
200 |
var names []string |
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
201 |
for _, fi := range rfi { |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
diff
changeset
|
202 |
names = append(names, fi.Name()) |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
203 |
} |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
204 |
return names, nil |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
205 |
} |
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parents:
diff
changeset
|
206 |
|
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
207 |
func (f *UnionFile) Stat() (os.FileInfo, error) { |
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Use vendoring for backward compatibility
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parents:
diff
changeset
|
208 |
if f.Layer != nil { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
209 |
return f.Layer.Stat() |
2a9ec03fe5a1
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parents:
diff
changeset
|
210 |
} |
2a9ec03fe5a1
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parents:
diff
changeset
|
211 |
if f.Base != nil { |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
diff
changeset
|
212 |
return f.Base.Stat() |
2a9ec03fe5a1
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parents:
diff
changeset
|
213 |
} |
2a9ec03fe5a1
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parents:
diff
changeset
|
214 |
return nil, BADFD |
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parents:
diff
changeset
|
215 |
} |
2a9ec03fe5a1
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parents:
diff
changeset
|
216 |
|
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Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
217 |
func (f *UnionFile) Sync() (err error) { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
218 |
if f.Layer != nil { |
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parents:
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changeset
|
219 |
err = f.Layer.Sync() |
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diff
changeset
|
220 |
if err == nil && f.Base != nil { |
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Use vendoring for backward compatibility
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parents:
diff
changeset
|
221 |
err = f.Base.Sync() |
2a9ec03fe5a1
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diff
changeset
|
222 |
} |
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diff
changeset
|
223 |
return err |
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parents:
diff
changeset
|
224 |
} |
2a9ec03fe5a1
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Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
225 |
if f.Base != nil { |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
diff
changeset
|
226 |
return f.Base.Sync() |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
diff
changeset
|
227 |
} |
2a9ec03fe5a1
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diff
changeset
|
228 |
return BADFD |
2a9ec03fe5a1
Use vendoring for backward compatibility
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parents:
diff
changeset
|
229 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
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diff
changeset
|
230 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
231 |
func (f *UnionFile) Truncate(s int64) (err error) { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
232 |
if f.Layer != nil { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
233 |
err = f.Layer.Truncate(s) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
234 |
if err == nil && f.Base != nil { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
235 |
err = f.Base.Truncate(s) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
236 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
237 |
return err |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
238 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
239 |
if f.Base != nil { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
240 |
return f.Base.Truncate(s) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
241 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
242 |
return BADFD |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
243 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
244 |
|
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
245 |
func (f *UnionFile) WriteString(s string) (n int, err error) { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
246 |
if f.Layer != nil { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
247 |
n, err = f.Layer.WriteString(s) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
248 |
if err == nil && f.Base != nil { |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
249 |
_, err = f.Base.WriteString(s) |
2a9ec03fe5a1
Use vendoring for backward compatibility
Mikael Berthe <mikael@lilotux.net>
parents:
diff
changeset
|
250 |
} |
2a9ec03fe5a1
Use vendoring for backward compatibility
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251 |
return n, err |
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252 |
} |
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253 |
if f.Base != nil { |
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254 |
return f.Base.WriteString(s) |
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255 |
} |
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256 |
return 0, BADFD |
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257 |
} |
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258 |
|
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259 |
func copyToLayer(base Fs, layer Fs, name string) error { |
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260 |
bfh, err := base.Open(name) |
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261 |
if err != nil { |
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262 |
return err |
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263 |
} |
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264 |
defer bfh.Close() |
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265 |
|
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266 |
// First make sure the directory exists |
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267 |
exists, err := Exists(layer, filepath.Dir(name)) |
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268 |
if err != nil { |
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269 |
return err |
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270 |
} |
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271 |
if !exists { |
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272 |
err = layer.MkdirAll(filepath.Dir(name), 0777) // FIXME? |
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273 |
if err != nil { |
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|
274 |
return err |
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275 |
} |
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276 |
} |
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277 |
|
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278 |
// Create the file on the overlay |
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279 |
lfh, err := layer.Create(name) |
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|
280 |
if err != nil { |
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|
281 |
return err |
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282 |
} |
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283 |
n, err := io.Copy(lfh, bfh) |
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|
284 |
if err != nil { |
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285 |
// If anything fails, clean up the file |
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|
286 |
layer.Remove(name) |
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|
287 |
lfh.Close() |
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|
288 |
return err |
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|
289 |
} |
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|
290 |
|
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|
291 |
bfi, err := bfh.Stat() |
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292 |
if err != nil || bfi.Size() != n { |
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|
293 |
layer.Remove(name) |
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|
294 |
lfh.Close() |
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|
295 |
return syscall.EIO |
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|
296 |
} |
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|
297 |
|
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|
298 |
err = lfh.Close() |
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|
299 |
if err != nil { |
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parents:
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|
300 |
layer.Remove(name) |
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parents:
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|
301 |
lfh.Close() |
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|
302 |
return err |
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parents:
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|
303 |
} |
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parents:
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|
304 |
return layer.Chtimes(name, bfi.ModTime(), bfi.ModTime()) |
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parents:
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|
305 |
} |