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|
package repository
import (
"bytes"
"context"
"fmt"
"io"
"time"
gitalyerrors "gitlab.com/gitlab-org/gitaly/v14/internal/errors"
"gitlab.com/gitlab-org/gitaly/v14/internal/git"
"gitlab.com/gitlab-org/gitaly/v14/internal/git/localrepo"
"gitlab.com/gitlab-org/gitaly/v14/internal/gitaly/transaction"
"gitlab.com/gitlab-org/gitaly/v14/internal/helper"
"gitlab.com/gitlab-org/gitaly/v14/internal/transaction/txinfo"
"gitlab.com/gitlab-org/gitaly/v14/internal/transaction/voting"
"gitlab.com/gitlab-org/gitaly/v14/proto/go/gitalypb"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
func (s *server) FetchRemote(ctx context.Context, req *gitalypb.FetchRemoteRequest) (*gitalypb.FetchRemoteResponse, error) {
if err := s.validateFetchRemoteRequest(req); err != nil {
return nil, err
}
var stderr bytes.Buffer
opts := localrepo.FetchOpts{
Stderr: &stderr,
Force: req.Force,
Prune: !req.NoPrune,
Tags: localrepo.FetchOptsTagsAll,
Verbose: req.GetCheckTagsChanged(),
DisableTransactions: true,
}
if req.GetNoTags() {
opts.Tags = localrepo.FetchOptsTagsNone
}
repo := s.localrepo(req.GetRepository())
remoteName := "inmemory"
remoteURL := req.GetRemoteParams().GetUrl()
config := []git.ConfigPair{
{Key: "remote.inmemory.url", Value: remoteURL},
}
for _, refspec := range s.getRefspecs(req.GetRemoteParams().GetMirrorRefmaps()) {
config = append(config, git.ConfigPair{
Key: "remote.inmemory.fetch", Value: refspec,
})
}
if authHeader := req.GetRemoteParams().GetHttpAuthorizationHeader(); authHeader != "" {
config = append(config, git.ConfigPair{
Key: fmt.Sprintf("http.%s.extraHeader", remoteURL),
Value: "Authorization: " + authHeader,
})
}
if host := req.GetRemoteParams().GetHttpHost(); host != "" {
config = append(config, git.ConfigPair{
Key: fmt.Sprintf("http.%s.extraHeader", remoteURL),
Value: "Host: " + host,
})
}
opts.CommandOptions = append(opts.CommandOptions, git.WithConfigEnv(config...))
sshCommand, cleanup, err := git.BuildSSHInvocation(ctx, req.GetSshKey(), req.GetKnownHosts())
if err != nil {
return nil, err
}
defer cleanup()
opts.Env = append(opts.Env, "GIT_SSH_COMMAND="+sshCommand)
if req.GetTimeout() > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, time.Duration(req.GetTimeout())*time.Second)
defer cancel()
}
if err := repo.FetchRemote(ctx, remoteName, opts); err != nil {
if _, ok := status.FromError(err); ok {
// this check is used because of internal call to alternates.PathAndEnv
// which may return gRPC status as an error result
return nil, err
}
errMsg := stderr.String()
if errMsg != "" {
return nil, fmt.Errorf("fetch remote: %q: %w", errMsg, err)
}
return nil, fmt.Errorf("fetch remote: %w", err)
}
// Ideally, we'd do the voting process via git-fetch(1) using the reference-transaction
// hook. But by default this would lead to one hook invocation per updated ref, which is
// infeasible performance-wise. While this could be fixed via the `--atomic` flag, that's
// not a solution either: we rely on the fact that refs get updated even if a subset of refs
// diverged, and with atomic transactions it would instead be an all-or-nothing operation.
//
// Instead, we do the second-best thing, which is to vote on the resulting references. This
// is of course racy and may conflict with other mutators, causing the vote to fail. But it
// is arguably preferable to accept races in favour always replicating. If loosing the race,
// we'd fail this RPC and schedule a replication job afterwards.
if err := transaction.RunOnContext(ctx, func(tx txinfo.Transaction) error {
hash := voting.NewVoteHash()
if err := repo.ExecAndWait(ctx, git.SubCmd{
Name: "for-each-ref",
}, git.WithStdout(hash)); err != nil {
return fmt.Errorf("cannot compute references vote: %w", err)
}
vote, err := hash.Vote()
if err != nil {
return err
}
return s.txManager.Vote(ctx, tx, vote, voting.UnknownPhase)
}); err != nil {
return nil, status.Errorf(codes.Aborted, "failed vote on refs: %v", err)
}
out := &gitalypb.FetchRemoteResponse{TagsChanged: true}
if req.GetCheckTagsChanged() {
out.TagsChanged = didTagsChange(&stderr)
}
return out, nil
}
func didTagsChange(r io.Reader) bool {
scanner := git.NewFetchScanner(r)
for scanner.Scan() {
status := scanner.StatusLine()
// We can't detect if tags have been deleted, but we never call fetch
// with --prune-tags at the moment, so it should never happen.
if status.IsTagAdded() || status.IsTagUpdated() {
return true
}
}
// If the scanner fails for some reason, we don't know if tags changed, so
// assume they did for safety reasons.
return scanner.Err() != nil
}
func (s *server) validateFetchRemoteRequest(req *gitalypb.FetchRemoteRequest) error {
if req.GetRepository() == nil {
return helper.ErrInvalidArgument(gitalyerrors.ErrEmptyRepository)
}
if req.GetRemoteParams() == nil {
return helper.ErrInvalidArgumentf("missing remote params")
}
if req.GetRemoteParams().GetUrl() == "" {
return helper.ErrInvalidArgumentf("blank or empty remote URL")
}
return nil
}
func (s *server) getRefspecs(refmaps []string) []string {
if len(refmaps) == 0 {
return []string{"refs/*:refs/*"}
}
refspecs := make([]string, 0, len(refmaps))
for _, refmap := range refmaps {
switch refmap {
case "all_refs":
// with `all_refs`, the repository is equivalent to the result of `git clone --mirror`
refspecs = append(refspecs, "refs/*:refs/*")
case "heads":
refspecs = append(refspecs, "refs/heads/*:refs/heads/*")
case "tags":
refspecs = append(refspecs, "refs/tags/*:refs/tags/*")
default:
refspecs = append(refspecs, refmap)
}
}
return refspecs
}
|
