appview/pulls: fix stacked resubmits using the wrong source-sha

the SHA stored on the sh.tangled.repo.pull record was incorrect, causing
spindles to report the wrong SHA in pipeline statuses.

Signed-off-by: oppiliappan <[e-mail]>

appview/db/pulls.go

···
 	return err
 }
 
-func ResubmitPull(e Execer, pull *models.Pull, newPatch, sourceRev string) error {
-	newRoundNumber := len(pull.Submissions)
+func ResubmitPull(e Execer, pullAt syntax.ATURI, newRoundNumber int, newPatch string, newSourceRev string) error {
 	_, err := e.Exec(`
 		insert into pull_submissions (pull_at, round_number, patch, source_rev)
 		values (?, ?, ?, ?)
-	`, pull.PullAt(), newRoundNumber, newPatch, sourceRev)
+	`, pullAt, newRoundNumber, newPatch, newSourceRev)
 
 	return err
 }

appview/models/pull.go

···
 func (p Pull) AsRecord() tangled.RepoPull {
 	var source *tangled.RepoPull_Source
 	if p.PullSource != nil {
-		s := p.PullSource.AsRecord()
-		source = &s
+		source = &tangled.RepoPull_Source{}
+		source.Branch = p.PullSource.Branch
 		source.Sha = p.LatestSha()
+		if p.PullSource.RepoAt != nil {
+			s := p.PullSource.Repo.RepoAt().String()
+			source.Repo = &s
+		}
 	}
 
 	record := tangled.RepoPull{
···
 
 	// optionally populate this for reverse mappings
 	Repo *Repo
-}
-
-func (p PullSource) AsRecord() tangled.RepoPull_Source {
-	var repoAt *string
-	if p.RepoAt != nil {
-		s := p.RepoAt.String()
-		repoAt = &s
-	}
-	record := tangled.RepoPull_Source{
-		Branch: p.Branch,
-		Repo:   repoAt,
-	}
-	return record
 }
 
 type PullSubmission struct {

appview/pulls/pulls.go

···
 
 	targetBranch := branchResp
 
-	latestSourceRev := pull.Submissions[pull.LastRoundNumber()].SourceRev
+	latestSourceRev := pull.LatestSha()
 
 	if pull.IsStacked() && stack != nil {
 		top := stack[0]
-		latestSourceRev = top.Submissions[top.LastRoundNumber()].SourceRev
+		latestSourceRev = top.LatestSha()
 	}
 
 	if latestSourceRev != targetBranch.Hash {
···
 
 	// validate sourceRev if branch/fork based
 	if pull.IsBranchBased() || pull.IsForkBased() {
-		if sourceRev == pull.Submissions[pull.LastRoundNumber()].SourceRev {
+		if sourceRev == pull.LatestSha() {
 			s.pages.Notice(w, "resubmit-error", "This branch has not changed since the last submission.")
 			return
 		}
···
 	}
 	defer tx.Rollback()
 
-	err = db.ResubmitPull(tx, pull, patch, sourceRev)
+	pullAt := pull.PullAt()
+	newRoundNumber := len(pull.Submissions)
+	newPatch := patch
+	newSourceRev := sourceRev
+	err = db.ResubmitPull(tx, pullAt, newRoundNumber, newPatch, newSourceRev)
 	if err != nil {
 		log.Println("failed to create pull request", err)
 		s.pages.Notice(w, "resubmit-error", "Failed to create pull request. Try again later.")
···
 			continue
 		}
 
-		submission := np.Submissions[np.LastRoundNumber()]
-
-		// resubmit the old pull
-		err := db.ResubmitPull(tx, op, submission.Patch, submission.SourceRev)
+		// resubmit the new pull
+		pullAt := op.PullAt()
+		newRoundNumber := len(op.Submissions)
+		newPatch := np.LatestPatch()
+		newSourceRev := np.LatestSha()
+		err := db.ResubmitPull(tx, pullAt, newRoundNumber, newPatch, newSourceRev)
 
 		if err != nil {
 			log.Println("failed to update pull", err, op.PullId)
···
 			return
 		}
 
-		record := op.AsRecord()
-		record.Patch = submission.Patch
+		record := np.AsRecord()
 
 		writes = append(writes, &comatproto.RepoApplyWrites_Input_Writes_Elem{
 			RepoApplyWrites_Update: &comatproto.RepoApplyWrites_Update{