Fix missing message in git hook when pull requests disabled on fork (#22625)

And also the other way around, it would show an non-working URL in the
message when pull requests are disabled on the base repository but
enabled on the fork.

routers/private/hook_post_receive.go

@@ -173,13 +173,6 @@ func HookPostReceive(ctx *gitea_context.PrivateContext) {
 					return
 				}
 
-				if !repo.AllowsPulls() {
-					// We can stop there's no need to go any further
-					ctx.JSON(http.StatusOK, private.HookPostReceiveResult{
-						RepoWasEmpty: wasEmpty,
-					})
-					return
-				}
 				baseRepo = repo
 
 				if repo.IsFork {
@@ -191,7 +184,17 @@ func HookPostReceive(ctx *gitea_context.PrivateContext) {
 						})
 						return
 					}
-					baseRepo = repo.BaseRepo
+					if repo.BaseRepo.AllowsPulls() {
+						baseRepo = repo.BaseRepo
+					}
+				}
+
+				if !baseRepo.AllowsPulls() {
+					// We can stop there's no need to go any further
+					ctx.JSON(http.StatusOK, private.HookPostReceiveResult{
+						RepoWasEmpty: wasEmpty,
+					})
+					return
 				}
 			}
 
@@ -217,14 +220,14 @@ func HookPostReceive(ctx *gitea_context.PrivateContext) {
 					branch = fmt.Sprintf("%s:%s", repo.OwnerName, branch)
 				}
 				results = append(results, private.HookPostReceiveBranchResult{
-					Message: setting.Git.PullRequestPushMessage && repo.AllowsPulls(),
+					Message: setting.Git.PullRequestPushMessage && baseRepo.AllowsPulls(),
 					Create:  true,
 					Branch:  branch,
 					URL:     fmt.Sprintf("%s/compare/%s...%s", baseRepo.HTMLURL(), util.PathEscapeSegments(baseRepo.DefaultBranch), util.PathEscapeSegments(branch)),
 				})
 			} else {
 				results = append(results, private.HookPostReceiveBranchResult{
-					Message: setting.Git.PullRequestPushMessage && repo.AllowsPulls(),
+					Message: setting.Git.PullRequestPushMessage && baseRepo.AllowsPulls(),
 					Create:  false,
 					Branch:  branch,
 					URL:     fmt.Sprintf("%s/pulls/%d", baseRepo.HTMLURL(), pr.Index),