bundles: fetch changes before building incremental bundle

Add an invocation of 'git fetch' to 'bundles.CreateIncrementalBundle()'
before running 'git bundle' to ensure that the latest updates to the
repository are captured in the bundle. If this is not done, the repository
will never see any updates, and will never create an incremental bundle.

Signed-off-by: Victoria Dye <vdye@github.com>

Author: vdye

internal/bundles/bundles.go

@@ -360,6 +360,12 @@ func (b *bundleProvider) CreateIncrementalBundle(ctx context.Context, repo *core
 	ctx, exitRegion := b.logger.Region(ctx, "bundles", "create_incremental_bundle")
 	defer exitRegion()
 
+	// Fetch latest updates to repo
+	err := b.gitHelper.UpdateBareRepo(ctx, repo.RepoDir)
+	if err != nil {
+		return nil, fmt.Errorf("failed to fetch updates to repo: %w", err)
+	}
+
 	bundle := b.createDistinctBundle(repo, list)
 
 	lines, err := b.getAllPrereqsForIncrementalBundle(list)

internal/git/git.go

@@ -16,6 +16,7 @@ type GitHelper interface {
 	CreateBundleFromRefs(ctx context.Context, repoDir string, filename string, refs map[string]string) error
 	CreateIncrementalBundle(ctx context.Context, repoDir string, filename string, prereqs []string) (bool, error)
 	CloneBareRepo(ctx context.Context, url string, destination string) error
+	UpdateBareRepo(ctx context.Context, repoDir string) error
 }
 
 type gitHelper struct {
@@ -139,3 +140,12 @@ func (g *gitHelper) CloneBareRepo(ctx context.Context, url string, destination s
 
 	return nil
 }
+
+func (g *gitHelper) UpdateBareRepo(ctx context.Context, repoDir string) error {
+	gitErr := g.gitCommand(ctx, "-C", repoDir, "fetch", "origin")
+	if gitErr != nil {
+		return g.logger.Errorf(ctx, "failed to fetch latest refs: %w", gitErr)
+	}
+
+	return nil
+}