pkg/vcs: extend ListCommitHashes

Rename the method to LatestCommit and make it more flexible:
1) Return the commit date alongside the commit hash.
2) Rename the time filter to highlight that it's non-inclusive.
3) Make it possible to query the commits newer than the specified commit
   hash.

It will let us poll lore archives more efficiently.

1 files changed, 4 insertions, 1 deletions

diff --git a/syz-cluster/series-tracker/main.go b/syz-cluster/series-tracker/main.go
index 2b6611798..b8638d897 100644
--- a/syz-cluster/series-tracker/main.go
+++ b/syz-cluster/series-tracker/main.go
@@ -99,7 +99,10 @@ func (sf *SeriesFetcher) Update(ctx context.Context, from time.Time) error {
 		if err != nil {
 			return fmt.Errorf("failed to poll %q: %w", url, err)
 		}
-		repoList, err := lore.ReadArchive(gitRepo, from)
+		// We could have been fetching the emails precisely starting from the last Update() attempt,
+		// but since we may only save it once the whole series is there, it's easier to just look at all
+		// the recent messages.
+		repoList, err := lore.ReadArchive(gitRepo, "", from)
 		if err != nil {
 			return err
 		}