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submarine/internal/submodule/git/fetch.go
T
Simon FrankenandClaude Opus 5.5 27f0c0b5d2 Fetch in the background and follow changes in the repositories
- On startup, after the local state is shown, fetch the superproject and
  every initialized submodule (all remotes, prune, at most 8 at once).
  Fetches never prompt; failures show git's message. --no-fetch skips it,
  f fetches again.
- The header shows "fetching n/m", then the fetch age and failures; the
  detail pane shows each submodule's last fetch and fetch errors.
- The git provider polls each repository's metadata (refs, HEAD, index,
  .gitmodules) every 2 s and reports changes. The app reloads only what
  changed, keeping old values, expansion and cursor; loads are
  single-flight with coalesced reruns. Refresh is driven by the
  repositories, so a fetch in another shell updates the view like ours.
- r reloads everything (worktree edits are not watched).
- Docs: F50-F53, N1/N8 rewritten, D18-D20 (D12 superseded).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-21 16:15:22 +02:00

80 lines
2.1 KiB
Go

package git
import (
"context"
"errors"
"fmt"
"os"
"strings"
"time"
)
// fetchTimeout bounds a single fetch, e.g. against an unreachable host.
const fetchTimeout = 2 * time.Minute
// maxFetches bounds concurrent fetches; they wait on the network, not the
// CPU.
const maxFetches = 8
// sshBatchEnv makes ssh fail instead of asking for a password or host key,
// which would corrupt the terminal UI. It is nil if the user configured
// their own ssh command.
func sshBatchEnv(root string) []string {
if os.Getenv("GIT_SSH_COMMAND") != "" {
return nil
}
if out, ok, _ := try(context.Background(), root, "config", "core.sshCommand"); ok && out != "" {
return nil
}
return []string{"GIT_SSH_COMMAND=ssh -o BatchMode=yes"}
}
// Fetchable reports whether path ("" is the superproject) is a checked-out
// repository.
func (p *Provider) Fetchable(path string) bool {
_, ok := p.repoDir(path)
return ok
}
// repoDir returns the worktree of path if it is initialized.
func (p *Provider) repoDir(path string) (string, bool) {
if path == "" {
return p.root, true
}
p.mu.RLock()
in, ok := p.mods[path]
p.mu.RUnlock()
if !ok || !initialized(in.dir) {
return "", false
}
return in.dir, true
}
// Fetch fetches all remotes of one repository. Submodules are fetched
// separately, not recursively. The error is git's first line of output.
func (p *Provider) Fetch(ctx context.Context, path string) error {
dir, ok := p.repoDir(path)
if !ok {
return fmt.Errorf("%s is not initialized", path)
}
select {
case p.fetchSem <- struct{}{}:
defer func() { <-p.fetchSem }()
case <-ctx.Done():
return ctx.Err()
}
ctx, cancel := context.WithTimeout(ctx, fetchTimeout)
defer cancel()
_, err := runEnv(ctx, dir, p.sshEnv, "fetch", "--all", "--prune", "--no-recurse-submodules", "--quiet")
var ge *gitError
switch {
case errors.Is(err, context.DeadlineExceeded):
return fmt.Errorf("timed out after %s", fetchTimeout)
case errors.As(err, &ge) && ge.Stderr != "":
line, _, _ := strings.Cut(ge.Stderr, "\n")
return errors.New(strings.TrimPrefix(line, "fatal: "))
}
return err
}