Preserve old behavior

pkg/notes/notes.go

@@ -1020,28 +1020,28 @@ func (g *Gatherer) prsForCommitFromSHA(sha string) (prs []*gogithub.PullRequest,
 }
 
 func (g *Gatherer) prsForCommitFromMessage(commitMessage string) (prs []*gogithub.PullRequest, err error) {
-	mainPrNum, err := prNumForCommitFromMessage(commitMessage)
+	prsNum, err := prsNumForCommitFromMessage(commitMessage)
 	if err != nil {
 		return nil, err
 	}
 
-	// Given the PR number that we've now converted to an integer, get the PR from
-	// the API
-	mainPr, err := g.getPr(mainPrNum)
-	if err != nil {
-		return prs, err
-	}
-
-	prs = append(prs, mainPr)
+	for _, prNum := range prsNum {
+		// Given the PR number that we've now converted to an integer, get the PR from
+		// the API
+		mainPr, err := g.getPr(prNum)
+		if err != nil {
+			return prs, err
+		}
+		prs = append(prs, mainPr)
 
-	originPrNum, origPrErr := originPrNumFromPr(mainPr)
-	if origPrErr == nil {
-		originPr, err := g.getPr(originPrNum)
-		if err == nil {
-			prs = append(prs, originPr)
+		originPrNum, origPrErr := originPrNumFromPr(mainPr)
+		if origPrErr == nil {
+			originPr, err := g.getPr(originPrNum)
+			if err == nil {
+				prs = append(prs, originPr)
+			}
 		}
 	}
-
 	return prs, err
 }
 
@@ -1073,15 +1073,24 @@ var (
 	regexProwBranch = regexp.MustCompile(`cherry-pick-(?P<number>\d+)-to`)
 )
 
-func prNumForCommitFromMessage(commitMessage string) (prs int, err error) {
+func prsNumForCommitFromMessage(commitMessage string) (prs []int, err error) {
 	if pr := prForRegex(regexMergedPR, commitMessage); pr != 0 {
-		return pr, nil
+		prs = append(prs, pr)
 	}
 
 	if pr := prForRegex(regexSquashPR, commitMessage); pr != 0 {
-		return pr, nil
+		prs = append(prs, pr)
+	}
+
+	if pr := prForRegex(regexHackBranch, commitMessage); pr != 0 {
+		prs = append(prs, pr)
+	}
+
+	if len(prs) == 0 {
+		return nil, errNoPRIDFoundInCommitMessage
+	} else {
+		return prs, nil
 	}
-	return 0, errNoPRIDFoundInCommitMessage
 }
 
 func originPrNumFromPr(pr *gogithub.PullRequest) (origPRNum int, err error) {

pkg/notes/notes_gatherer_test.go

@@ -289,10 +289,15 @@ func TestGatherNotes(t *testing.T) {
 		"when commit messages hold PR numbers, we use those and don't query to get a list of PRs for a SHA": {
 			commitList: []*github.RepositoryCommit{
 				repoCommit("123", "there is the message Merge pull request #123 somewhere in the middle"),
-				repoCommit("124", "and lastly in parens (#124) yeah"),
+				repoCommit("124", "some automated-cherry-pick-of-#124 can be found too"),
+				repoCommit("125", "and lastly in parens (#125) yeah"),
+				repoCommit("126", `all three together
+					some Merge pull request #126 and
+					another automated-cherry-pick-of-#127 with
+					a thing (#128) in parens`),
 			},
 			getPullRequestStubber: func(t *testing.T) getPullRequestStub {
-				seenPRs := newIntsRecorder(123, 124)
+				seenPRs := newIntsRecorder(123, 124, 125, 126, 127, 128)
 
 				return func(_ context.Context, org, repo string, prID int) (*github.PullRequest, *github.Response, error) {
 					checkOrgRepo(t, org, repo)
@@ -302,7 +307,7 @@ func TestGatherNotes(t *testing.T) {
 					return nil, nil, nil
 				}
 			},
-			expectedGetPullRequestCallCount: 2,
+			expectedGetPullRequestCallCount: 6,
 		},
 
 		"when the PR is a cherry pick": {

pkg/notes/notes_test.go

@@ -222,12 +222,12 @@ func TestGetPRNumberFromCommitMessage(t *testing.T) {
 
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-			pr, err := prNumForCommitFromMessage(tc.commitMessage)
+			prs, err := prsNumForCommitFromMessage(tc.commitMessage)
 			if err != nil {
 				t.Fatalf("Expected no error to occur but got %v", err)
 			}
-			if pr != tc.expectedPRNumber {
-				t.Errorf("Expected PR number to be %d but was %d", tc.expectedPRNumber, pr)
+			if prs[0] != tc.expectedPRNumber {
+				t.Errorf("Expected PR number to be %d but was %d", tc.expectedPRNumber, prs[0])
 			}
 		})
 	}

pkg/notes/notes_v2.go

@@ -278,7 +278,7 @@ func (g *Gatherer) listLeftParentCommits(opts *options.Options) ([]*commitPrPair
 		}
 
 		// Find and collect PR number from commit message
-		prNum, err := prNumForCommitFromMessage(commitPointer.Message)
+		prNums, err := prsNumForCommitFromMessage(commitPointer.Message)
 		if err == errNoPRIDFoundInCommitMessage {
 			logrus.WithFields(logrus.Fields{
 				"sha": hashString,
@@ -299,11 +299,11 @@ func (g *Gatherer) listLeftParentCommits(opts *options.Options) ([]*commitPrPair
 		}
 		logrus.WithFields(logrus.Fields{
 			"sha": hashString,
-			"pr":  prNum,
+			"prs": prNums,
 		}).Debug("found PR from commit")
 
 		// Only taking the first one, assuming they are merged by Prow
-		pairs = append(pairs, &commitPrPair{Commit: commitPointer, PrNum: prNum})
+		pairs = append(pairs, &commitPrPair{Commit: commitPointer, PrNum: prNums[0]})
 
 		// Advance pointer based on left parent
 		hashPointer = commitPointer.ParentHashes[0]