Support using the merge ref instead of the head ref in a pull request

Makefile

@@ -12,7 +12,7 @@ check:
 	PYTHONPATH=$(CURDIR) PYTHONDONTWRITEBYTECODE=1 pytest --verbose --showlocals $(TEST_TARGET)
 
 check-in-container:
-	podman run --rm -it -v $(CURDIR):/src:Z -w /src $(OGR_IMAGE) make check
+	podman run --rm -it -v $(CURDIR):/src:Z -w /src $(OGR_IMAGE) make -e GITHUB_TOKEN=$(GITHUB_TOKEN) GITLAB_TOKEN=$(GITLAB_TOKEN) check
 
 shell:
 	podman run --rm -ti -v $(CURDIR):/src:Z -w /src $(OGR_IMAGE) bash

ogr/abstract.py

@@ -315,6 +315,23 @@ class PRStatus(IntEnum):
     all = 4
 
 
+class CommitStatus(Enum):
+    pending = 1
+    success = 2
+    failure = 3
+    error = 4
+    canceled = 5
+    running = 6
+
+
+class MergeCommitStatus(Enum):
+    can_be_merged = 1
+    cannot_be_merged = 2
+    unchecked = 3
+    checking = 4
+    cannot_be_merged_recheck = 5
+
+
 class PullRequest(OgrAbstractClass):
     @deprecate_and_set_removal(
         since="0.9.0",
@@ -404,6 +421,14 @@ def patch(self) -> bytes:
     def head_commit(self) -> str:
         raise NotImplementedError
 
+    @property
+    def merge_commit_sha(self) -> str:
+        raise NotImplementedError()
+
+    @property
+    def merge_commit_status(self) -> MergeCommitStatus:
+        raise NotImplementedError()
+
     @property
     def source_project(self) -> "GitProject":
         raise NotImplementedError()
@@ -588,15 +613,6 @@ def get_statuses(self) -> List["CommitFlag"]:
         raise NotImplementedError()
 
 
-class CommitStatus(Enum):
-    pending = 1
-    success = 2
-    failure = 3
-    error = 4
-    canceled = 5
-    running = 6
-
-
 class CommitFlag(OgrAbstractClass):
     _states: Dict[str, CommitStatus] = dict()
 

ogr/services/github/pull_request.py

@@ -31,7 +31,7 @@
 from github.IssueComment import IssueComment as _GithubIssueComment
 from github.PullRequestComment import PullRequestComment as _GithubPullRequestComment
 
-from ogr.abstract import PRComment, PRStatus, PullRequest
+from ogr.abstract import PRComment, PRStatus, PullRequest, MergeCommitStatus
 from ogr.exceptions import GithubAPIException
 from ogr.services import github as ogr_github
 from ogr.services.base import BasePullRequest
@@ -109,6 +109,17 @@ def commits_url(self) -> str:
     def head_commit(self) -> str:
         return self._raw_pr.head.sha
 
+    @property
+    def merge_commit_sha(self) -> str:
+        return self._raw_pr.merge_commit_sha
+
+    @property
+    def merge_commit_status(self) -> MergeCommitStatus:
+        if self._raw_pr.mergeable:
+            return MergeCommitStatus.can_be_merged
+        else:
+            return MergeCommitStatus.cannot_be_merged
+
     @property
     def source_project(self) -> "ogr_github.GithubProject":
         if self._source_project is None:

ogr/services/gitlab/pull_request.py

@@ -21,11 +21,11 @@
 # SOFTWARE.
 
 import datetime
-from typing import List, Optional
+from typing import Dict, List, Optional
 
 from gitlab.v4.objects import MergeRequest as _GitlabMergeRequest
 
-from ogr.abstract import PullRequest, PRComment, PRStatus
+from ogr.abstract import PullRequest, PRComment, PRStatus, MergeCommitStatus
 from ogr.exceptions import GitlabAPIException
 from ogr.services import gitlab as ogr_gitlab
 from ogr.services.base import BasePullRequest
@@ -36,6 +36,13 @@ class GitlabPullRequest(BasePullRequest):
     _raw_pr: _GitlabMergeRequest
     _target_project: "ogr_gitlab.GitlabProject"
     _source_project: "ogr_gitlab.GitlabProject" = None
+    _merge_commit_status: Dict[str, MergeCommitStatus] = {
+        "can_be_merged": MergeCommitStatus.can_be_merged,
+        "cannot_be_merged": MergeCommitStatus.cannot_be_merged,
+        "unchecked": MergeCommitStatus.unchecked,
+        "checking": MergeCommitStatus.checking,
+        "cannot_be_merged_recheck": MergeCommitStatus.cannot_be_merged_recheck,
+    }
 
     @property
     def title(self) -> str:
@@ -103,6 +110,18 @@ def commits_url(self) -> str:
     def head_commit(self) -> str:
         return self._raw_pr.sha
 
+    @property
+    def merge_commit_sha(self) -> str:
+        return self._raw_pr.merge_commit_sha
+
+    @property
+    def merge_commit_status(self) -> MergeCommitStatus:
+        status = self._raw_pr.merge_status
+        if status in self._merge_commit_status:
+            return self._merge_commit_status[status]
+        else:
+            raise GitlabAPIException(f"Invalid merge_status {status}")
+
     @property
     def source_project(self) -> "ogr_gitlab.GitlabProject":
         if self._source_project is None: