kallithea Changeset - 2cf6d49b6073

Changeset - 2cf6d49b6073

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Andrew Shadura - 9 years ago 2017-04-15 14:10:39
andrew@shadura.me

git: add references for Git pull request heads

When a pull request is created, stick a reference to it in the refs/pull
namespace, similarly to what GitHub does, and remove it when the pull
request is deleted. That reference guarantees the commits stay around
and don't get garbage-collected when a PR is rebased or revised.
Also, that makes it possible to access head of historic pull requests
using Git by fetching a ref from the source repository.

Unlike GitHub though, we don't put the ref into the destination repository
and don't copy commits there to prevent undesired repository growth.
Kallithea uses global pull request identifiers, so there should not be
any confusion as to what pull request the ref corresponds to.
We may later provide a shim to redirect users to the source repository
if that deems needed.

1 file changed with 12 insertions and 1 deletions:

kallithea/model/pull_request.py

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kallithea/model/pull_request.py

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@@ @@ -36,13 +36,13 @@ from sqlalchemy.orm import joinedload @@
 from kallithea.model.meta import Session
 from kallithea.lib import helpers as h
 from kallithea.model.db import PullRequest, PullRequestReviewer, Notification, \
     ChangesetStatus, User
 from kallithea.model.notification import NotificationModel
 from kallithea.lib.utils2 import extract_mentioned_users, safe_unicode
+from kallithea.lib.utils2 import extract_mentioned_users, safe_str, safe_unicode
 log = logging.getLogger(__name__)
 def _assert_valid_reviewers(seq):
@@ @@ -136,12 +136,18 @@ class PullRequestModel(object): @@
             .filter(PullRequestReviewer.user_id.in_(r.user_id for r in reviewers)) \
             .delete(synchronize_session='fetch') # the default of 'evaluate' is not available
     def delete(self, pull_request):
         pull_request = PullRequest.guess_instance(pull_request)
         Session().delete(pull_request)
         if pull_request.org_repo.scm_instance.alias == 'git':
             # remove a ref under refs/pull/ so that commits can be garbage-collected
             try:
                 del pull_request.org_repo.scm_instance._repo["refs/pull/%d/head" % pull_request.pull_request_id]
             except KeyError:
                 pass
     def close_pull_request(self, pull_request):
         pull_request = PullRequest.guess_instance(pull_request)
         pull_request.status = PullRequest.STATUS_CLOSED
         pull_request.updated_on = datetime.datetime.now()
@@ @@ -225,12 +231,13 @@ class CreatePullRequestAction(object): @@
                                             other_repo.repo_name, other_display)
         description = description or _('No description')
         self.org_repo = org_repo
         self.other_repo = other_repo
         self.org_ref = org_ref
         self.org_rev = org_rev
         self.other_ref = other_ref
         self.title = title
         self.description = description
         self.owner = owner
         self.reviewers = reviewers
@@ @@ -249,12 +256,16 @@ class CreatePullRequestAction(object): @@
         pr.title = self.title
         pr.description = self.description
         pr.owner = self.owner
         Session().add(pr)
         Session().flush() # make database assign pull_request_id
         if self.org_repo.scm_instance.alias == 'git':
             # create a ref under refs/pull/ so that commits don't get garbage-collected
             self.org_repo.scm_instance._repo["refs/pull/%d/head" % pr.pull_request_id] = safe_str(self.org_rev)
         #reset state to under-review
         from kallithea.model.changeset_status import ChangesetStatusModel
         from kallithea.model.comment import ChangesetCommentsModel
         comment = ChangesetCommentsModel().create(
             text=u'',
             repo=self.org_repo,

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