1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
package filesystem
import (
"fmt"
"os"
"gopkg.in/src-d/go-git.v4/core"
"gopkg.in/src-d/go-git.v4/formats/packfile"
"gopkg.in/src-d/go-git.v4/storage/filesystem/internal/dotgit"
"gopkg.in/src-d/go-git.v4/storage/filesystem/internal/index"
"gopkg.in/src-d/go-git.v4/utils/fs"
)
// ObjectStorage is an implementation of core.ObjectStorage that stores
// data on disk in the standard git format (this is, the .git directory).
//
// Zero values of this type are not safe to use, see the New function below.
//
// Currently only reads are supported, no writting.
//
// Also values from this type are not yet able to track changes on disk, this is,
// Gitdir values will get outdated as soon as repositories change on disk.
type ObjectStorage struct {
dir *dotgit.DotGit
index index.Index
}
func (s *ObjectStorage) NewObject() core.Object {
return &core.MemoryObject{}
}
// Set adds a new object to the storage. As this functionality is not
// yet supported, this method always returns a "not implemented yet"
// error an zero hash.
func (s *ObjectStorage) Set(core.Object) (core.Hash, error) {
return core.ZeroHash, fmt.Errorf("not implemented yet")
}
// Get returns the object with the given hash, by searching for it in
// the packfile.
func (s *ObjectStorage) Get(t core.ObjectType, h core.Hash) (core.Object, error) {
offset, err := s.index.Get(h)
if err != nil {
return nil, err
}
fs, path, err := s.dir.Packfile()
if err != nil {
return nil, err
}
f, err := fs.Open(path)
if err != nil {
return nil, err
}
defer func() {
errClose := f.Close()
if err == nil {
err = errClose
}
}()
_, err = f.Seek(offset, os.SEEK_SET)
if err != nil {
return nil, err
}
r := packfile.NewSeekable(f)
r.HashToOffset = map[core.Hash]int64(s.index)
p := packfile.NewParser(r)
obj := s.NewObject()
err = p.FillObject(obj)
if err != nil {
return nil, err
}
if core.AnyObject != t && obj.Type() != t {
return nil, core.ErrObjectNotFound
}
return obj, nil
}
// Iter returns an iterator for all the objects in the packfile with the
// given type.
func (s *ObjectStorage) Iter(t core.ObjectType) (core.ObjectIter, error) {
var objects []core.Object
for hash := range s.index {
object, err := s.Get(core.AnyObject, hash)
if err != nil {
return nil, err
}
if t == core.AnyObject || object.Type() == t {
objects = append(objects, object)
}
}
return core.NewObjectSliceIter(objects), nil
}
func buildIndex(dir *dotgit.DotGit) (index.Index, error) {
fs, idxfile, err := dir.Idxfile()
if err != nil {
if err == dotgit.ErrIdxNotFound {
return buildIndexFromPackfile(dir)
}
return nil, err
}
return buildIndexFromIdxfile(fs, idxfile)
}
func buildIndexFromPackfile(dir *dotgit.DotGit) (index.Index, error) {
fs, packfile, err := dir.Packfile()
if err != nil {
return nil, err
}
f, err := fs.Open(packfile)
if err != nil {
return nil, err
}
defer func() {
errClose := f.Close()
if err == nil {
err = errClose
}
}()
return index.NewFromPackfile(f)
}
func buildIndexFromIdxfile(fs fs.FS, path string) (index.Index, error) {
f, err := fs.Open(path)
if err != nil {
return nil, err
}
defer func() {
errClose := f.Close()
if err == nil {
err = errClose
}
}()
return index.NewFromIdx(f)
}
|
