Branches not at ref commit ID should not be listed as Merged (#9614)

Once a branch has been merged if the commit ID no longer equals that of
the pulls ref commit id don't offer to delete the branch on the pull screen
and don't list it as merged on branches.

Fix #9201

When looking at the pull page we should also get the commits from the refs/pulls/x/head

Fix #9158

1 files changed, 49 insertions, 30 deletions

diff --git a/routers/repo/pull.go b/routers/repo/pull.go
index 418c2e9438..1a5c4a036f 100644
--- a/routers/repo/pull.go
+++ b/routers/repo/pull.go
@@ -330,25 +330,37 @@ func PrepareViewPullInfo(ctx *context.Context, issue *models.Issue) *git.Compare
 	repo := ctx.Repo.Repository
 	pull := issue.PullRequest
 
-	var err error
-	if err = pull.GetHeadRepo(); err != nil {
+	if err := pull.GetHeadRepo(); err != nil {
 		ctx.ServerError("GetHeadRepo", err)
 		return nil
 	}
 
+	if err := pull.GetBaseRepo(); err != nil {
+		ctx.ServerError("GetBaseRepo", err)
+		return nil
+	}
+
 	setMergeTarget(ctx, pull)
 
-	if err = pull.LoadProtectedBranch(); err != nil {
+	if err := pull.LoadProtectedBranch(); err != nil {
 		ctx.ServerError("GetLatestCommitStatus", err)
 		return nil
 	}
 	ctx.Data["EnableStatusCheck"] = pull.ProtectedBranch != nil && pull.ProtectedBranch.EnableStatusCheck
 
-	var headGitRepo *git.Repository
+	baseGitRepo, err := git.OpenRepository(pull.BaseRepo.RepoPath())
+	if err != nil {
+		ctx.ServerError("OpenRepository", err)
+		return nil
+	}
+	defer baseGitRepo.Close()
 	var headBranchExist bool
+	var headBranchSha string
 	// HeadRepo may be missing
 	if pull.HeadRepo != nil {
-		headGitRepo, err = git.OpenRepository(pull.HeadRepo.RepoPath())
+		var err error
+
+		headGitRepo, err := git.OpenRepository(pull.HeadRepo.RepoPath())
 		if err != nil {
 			ctx.ServerError("OpenRepository", err)
 			return nil
@@ -358,46 +370,53 @@ func PrepareViewPullInfo(ctx *context.Context, issue *models.Issue) *git.Compare
 		headBranchExist = headGitRepo.IsBranchExist(pull.HeadBranch)
 
 		if headBranchExist {
-			sha, err := headGitRepo.GetBranchCommitID(pull.HeadBranch)
+			headBranchSha, err = headGitRepo.GetBranchCommitID(pull.HeadBranch)
 			if err != nil {
 				ctx.ServerError("GetBranchCommitID", err)
 				return nil
 			}
+		}
+	}
 
-			commitStatuses, err := models.GetLatestCommitStatus(repo, sha, 0)
-			if err != nil {
-				ctx.ServerError("GetLatestCommitStatus", err)
-				return nil
-			}
-			if len(commitStatuses) > 0 {
-				ctx.Data["LatestCommitStatuses"] = commitStatuses
-				ctx.Data["LatestCommitStatus"] = models.CalcCommitStatus(commitStatuses)
-			}
+	sha, err := baseGitRepo.GetRefCommitID(pull.GetGitRefName())
+	if err != nil {
+		ctx.ServerError(fmt.Sprintf("GetRefCommitID(%s)", pull.GetGitRefName()), err)
+		return nil
+	}
 
-			if pull.ProtectedBranch != nil && pull.ProtectedBranch.EnableStatusCheck {
-				ctx.Data["is_context_required"] = func(context string) bool {
-					for _, c := range pull.ProtectedBranch.StatusCheckContexts {
-						if c == context {
-							return true
-						}
-					}
-					return false
+	commitStatuses, err := models.GetLatestCommitStatus(repo, sha, 0)
+	if err != nil {
+		ctx.ServerError("GetLatestCommitStatus", err)
+		return nil
+	}
+	if len(commitStatuses) > 0 {
+		ctx.Data["LatestCommitStatuses"] = commitStatuses
+		ctx.Data["LatestCommitStatus"] = models.CalcCommitStatus(commitStatuses)
+	}
+
+	if pull.ProtectedBranch != nil && pull.ProtectedBranch.EnableStatusCheck {
+		ctx.Data["is_context_required"] = func(context string) bool {
+			for _, c := range pull.ProtectedBranch.StatusCheckContexts {
+				if c == context {
+					return true
 				}
-				ctx.Data["IsRequiredStatusCheckSuccess"] = pull_service.IsCommitStatusContextSuccess(commitStatuses, pull.ProtectedBranch.StatusCheckContexts)
 			}
+			return false
 		}
+		ctx.Data["IsRequiredStatusCheckSuccess"] = pull_service.IsCommitStatusContextSuccess(commitStatuses, pull.ProtectedBranch.StatusCheckContexts)
 	}
 
-	if pull.HeadRepo == nil || !headBranchExist {
+	ctx.Data["HeadBranchMovedOn"] = headBranchSha != sha
+	ctx.Data["HeadBranchCommitID"] = headBranchSha
+	ctx.Data["PullHeadCommitID"] = sha
+
+	if pull.HeadRepo == nil || !headBranchExist || headBranchSha != sha {
 		ctx.Data["IsPullRequestBroken"] = true
 		ctx.Data["HeadTarget"] = "deleted"
-		ctx.Data["NumCommits"] = 0
-		ctx.Data["NumFiles"] = 0
-		return nil
 	}
 
-	compareInfo, err := headGitRepo.GetCompareInfo(models.RepoPath(repo.Owner.Name, repo.Name),
-		pull.BaseBranch, pull.HeadBranch)
+	compareInfo, err := baseGitRepo.GetCompareInfo(pull.BaseRepo.RepoPath(),
+		pull.BaseBranch, pull.GetGitRefName())
 	if err != nil {
 		if strings.Contains(err.Error(), "fatal: Not a valid object name") {
 			ctx.Data["IsPullRequestBroken"] = true