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//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/git2goutil"
"gitlab.com/gitlab-org/gitaly/v15/internal/git2go"
"gitlab.com/gitlab-org/gitaly/v15/internal/helper"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type conflictsSubcommand struct{}
func (cmd *conflictsSubcommand) Flags() *flag.FlagSet {
return flag.NewFlagSet("conflicts", flag.ExitOnError)
}
func (cmd *conflictsSubcommand) Run(_ context.Context, decoder *gob.Decoder, encoder *gob.Encoder) error {
var request git2go.ConflictsCommand
if err := decoder.Decode(&request); err != nil {
return err
}
res := cmd.conflicts(request)
return encoder.Encode(res)
}
func (*conflictsSubcommand) conflicts(request git2go.ConflictsCommand) git2go.ConflictsResult {
repo, err := git2goutil.OpenRepository(request.Repository)
if err != nil {
return conflictError(codes.Internal, fmt.Errorf("could not open repository: %w", err).Error())
}
oursOid, err := git.NewOid(request.Ours)
if err != nil {
return conflictError(codes.InvalidArgument, err.Error())
}
ours, err := repo.LookupCommit(oursOid)
if err != nil {
return convertError(err, git.ErrorCodeNotFound, codes.InvalidArgument)
}
theirsOid, err := git.NewOid(request.Theirs)
if err != nil {
return conflictError(codes.InvalidArgument, err.Error())
}
theirs, err := repo.LookupCommit(theirsOid)
if err != nil {
return convertError(err, git.ErrorCodeNotFound, codes.InvalidArgument)
}
index, err := repo.MergeCommits(ours, theirs, nil)
if err != nil {
return conflictError(codes.FailedPrecondition, fmt.Sprintf("could not merge commits: %v", err))
}
iterator, err := index.ConflictIterator()
if err != nil {
return conflictError(codes.Internal, fmt.Errorf("could not get conflicts: %w", err).Error())
}
var result git2go.ConflictsResult
for {
conflict, err := iterator.Next()
if err != nil {
var gitError *git.GitError
if errors.As(err, &gitError) && gitError.Code == git.ErrorCodeIterOver {
break
}
return conflictError(codes.Internal, err.Error())
}
merge, err := Merge(repo, conflict)
if err != nil {
if s, ok := status.FromError(err); ok {
return conflictError(s.Code(), s.Message())
}
return conflictError(codes.Internal, err.Error())
}
result.Conflicts = append(result.Conflicts, git2go.Conflict{
Ancestor: conflictEntryFromIndex(conflict.Ancestor),
Our: conflictEntryFromIndex(conflict.Our),
Their: conflictEntryFromIndex(conflict.Their),
Content: merge.Contents,
})
}
return result
}
// Merge will merge the given index conflict and produce a file with conflict
// markers.
func Merge(repo *git.Repository, conflict git.IndexConflict) (*git.MergeFileResult, error) {
var ancestor, our, their git.MergeFileInput
for entry, input := range map[*git.IndexEntry]*git.MergeFileInput{
conflict.Ancestor: &ancestor,
conflict.Our: &our,
conflict.Their: &their,
} {
if entry == nil {
continue
}
blob, err := repo.LookupBlob(entry.Id)
if err != nil {
return nil, helper.ErrFailedPreconditionf("could not get conflicting blob: %w", err)
}
input.Path = entry.Path
input.Mode = uint(entry.Mode)
input.Contents = blob.Contents()
}
merge, err := git.MergeFile(ancestor, our, their, nil)
if err != nil {
return nil, fmt.Errorf("could not compute conflicts: %w", err)
}
// In a case of tree-based conflicts (e.g. no ancestor), fallback to `Path`
// of `their` side. If that's also blank, fallback to `Path` of `our` side.
// This is to ensure that there's always a `Path` when we try to merge
// conflicts.
if merge.Path == "" {
if their.Path != "" {
merge.Path = their.Path
} else {
merge.Path = our.Path
}
}
return merge, nil
}
func conflictEntryFromIndex(entry *git.IndexEntry) git2go.ConflictEntry {
if entry == nil {
return git2go.ConflictEntry{}
}
return git2go.ConflictEntry{
Path: entry.Path,
Mode: int32(entry.Mode),
}
}
func conflictError(code codes.Code, message string) git2go.ConflictsResult {
err := git2go.ConflictError{
Code: code,
Message: message,
}
return git2go.ConflictsResult{
Err: err,
}
}
func convertError(err error, errorCode git.ErrorCode, returnCode codes.Code) git2go.ConflictsResult {
var gitError *git.GitError
if errors.As(err, &gitError) && gitError.Code == errorCode {
return conflictError(returnCode, err.Error())
}
return conflictError(codes.Internal, err.Error())
}
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