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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
//go:build static && system_libgit2
package main
import (
"context"
"encoding/gob"
"errors"
"flag"
"fmt"
git "github.com/libgit2/git2go/v33"
"gitlab.com/gitlab-org/gitaly/v15/cmd/gitaly-git2go-v15/git2goutil"
"gitlab.com/gitlab-org/gitaly/v15/internal/git2go"
)
type rebaseSubcommand struct{}
func (cmd *rebaseSubcommand) Flags() *flag.FlagSet {
return flag.NewFlagSet("rebase", flag.ExitOnError)
}
func (cmd *rebaseSubcommand) Run(ctx context.Context, decoder *gob.Decoder, encoder *gob.Encoder) error {
var request git2go.RebaseCommand
if err := decoder.Decode(&request); err != nil {
return err
}
commitID, err := cmd.rebase(ctx, &request)
return encoder.Encode(git2go.Result{
CommitID: commitID,
Err: git2go.SerializableError(err),
})
}
func (cmd *rebaseSubcommand) verify(ctx context.Context, r *git2go.RebaseCommand) error {
if r.Repository == "" {
return errors.New("missing repository")
}
if r.Committer.Name == "" {
return errors.New("missing committer name")
}
if r.Committer.Email == "" {
return errors.New("missing committer email")
}
if r.BranchName == "" && r.CommitID == "" {
return errors.New("missing branch name")
}
if r.BranchName != "" && r.CommitID != "" {
return errors.New("both branch name and commit ID")
}
if r.UpstreamRevision == "" && r.UpstreamCommitID == "" {
return errors.New("missing upstream revision")
}
if r.UpstreamRevision != "" && r.UpstreamCommitID != "" {
return errors.New("both upstream revision and upstream commit ID")
}
return nil
}
func (cmd *rebaseSubcommand) rebase(ctx context.Context, request *git2go.RebaseCommand) (string, error) {
if err := cmd.verify(ctx, request); err != nil {
return "", err
}
repo, err := git2goutil.OpenRepository(request.Repository)
if err != nil {
return "", fmt.Errorf("open repository: %w", err)
}
opts, err := git.DefaultRebaseOptions()
if err != nil {
return "", fmt.Errorf("get rebase options: %w", err)
}
opts.InMemory = 1
var commit *git.AnnotatedCommit
if request.BranchName != "" {
commit, err = repo.AnnotatedCommitFromRevspec(fmt.Sprintf("refs/heads/%s", request.BranchName))
if err != nil {
return "", fmt.Errorf("look up branch %q: %w", request.BranchName, err)
}
} else {
commitOid, err := git.NewOid(request.CommitID.String())
if err != nil {
return "", fmt.Errorf("parse commit %q: %w", request.CommitID, err)
}
commit, err = repo.LookupAnnotatedCommit(commitOid)
if err != nil {
return "", fmt.Errorf("look up commit %q: %w", request.CommitID, err)
}
}
upstreamCommitParam := request.UpstreamRevision
if upstreamCommitParam == "" {
upstreamCommitParam = request.UpstreamCommitID.String()
}
upstreamCommitOID, err := git.NewOid(upstreamCommitParam)
if err != nil {
return "", fmt.Errorf("parse upstream revision %q: %w", upstreamCommitParam, err)
}
upstreamCommit, err := repo.LookupAnnotatedCommit(upstreamCommitOID)
if err != nil {
return "", fmt.Errorf("look up upstream revision %q: %w", upstreamCommitParam, err)
}
mergeBase, err := repo.MergeBase(upstreamCommit.Id(), commit.Id())
if err != nil {
return "", fmt.Errorf("find merge base: %w", err)
}
if mergeBase.Equal(upstreamCommit.Id()) {
// Branch is zero commits behind, so do not rebase
return commit.Id().String(), nil
}
if mergeBase.Equal(commit.Id()) {
// Branch is merged, so fast-forward to upstream
return upstreamCommit.Id().String(), nil
}
mergeCommit, err := repo.LookupAnnotatedCommit(mergeBase)
if err != nil {
return "", fmt.Errorf("look up merge base: %w", err)
}
rebase, err := repo.InitRebase(commit, mergeCommit, upstreamCommit, &opts)
if err != nil {
return "", fmt.Errorf("initiate rebase: %w", err)
}
committer := git.Signature(request.Committer)
var oid *git.Oid
for {
op, err := rebase.Next()
if git.IsErrorCode(err, git.ErrorCodeIterOver) {
break
} else if err != nil {
return "", fmt.Errorf("rebase iterate: %w", err)
}
commit, err := repo.LookupCommit(op.Id)
if err != nil {
return "", fmt.Errorf("lookup commit: %w", err)
}
if err := rebase.Commit(op.Id, nil, &committer, commit.Message()); err != nil {
if git.IsErrorCode(err, git.ErrorCodeUnmerged) {
index, err := rebase.InmemoryIndex()
if err != nil {
return "", fmt.Errorf("getting conflicting index: %w", err)
}
conflictingFiles, err := getConflictingFiles(index)
if err != nil {
return "", fmt.Errorf("getting conflicting files: %w", err)
}
return "", fmt.Errorf("commit %q: %w", op.Id.String(), git2go.ConflictingFilesError{
ConflictingFiles: conflictingFiles,
})
}
// If the commit has already been applied on the target branch then we can
// skip it if we were told to.
if request.SkipEmptyCommits && git.IsErrorCode(err, git.ErrorCodeApplied) {
continue
}
return "", fmt.Errorf("commit %q: %w", op.Id.String(), err)
}
oid = op.Id.Copy()
}
// When the OID is unset here, then we didn't have to rebase any commits at all. We can
// thus return the upstream commit directly: rebasing nothing onto the upstream commit is
// the same as the upstream commit itself.
if oid == nil {
return upstreamCommit.Id().String(), nil
}
if err = rebase.Finish(); err != nil {
return "", fmt.Errorf("finish rebase: %w", err)
}
return oid.String(), nil
}
|