Automatically detect pickable PRs for patch releases

Signed-off-by: Joffrey F <joffrey@docker.com>

script/release/release.py

@@ -34,6 +34,15 @@ def create_initial_branch(repository, args):
     release_branch = repository.create_release_branch(args.release, args.base)
     if args.base and args.cherries:
         print('Detected patch version.')
+        auto_prs = repository.get_prs_in_milestone(args.release)
+        if auto_prs:
+            print(
+                'Found the following PRs in this release\'s milestone: {}'.format(', '.join(auto_prs))
+            )
+            proceed = yesno('Automatically cherry-pick detected PRs? Y/n', default=True)
+            if proceed:
+                repository.cherry_pick_prs(release_branch, auto_prs)
+
         cherries = input('Indicate (space-separated) PR numbers to cherry-pick then press Enter:\n')
         repository.cherry_pick_prs(release_branch, cherries.split())
 

script/release/release/repository.py

@@ -196,6 +196,24 @@ class Repository(object):
             f.flush()
             self.git_repo.git.am('--3way', f.name)
 
+    def get_prs_in_milestone(self, version):
+        milestones = self.gh_repo.get_milestones(state='open')
+        milestone = None
+        for ms in milestones:
+            if ms.title == version:
+                milestone = ms
+                break
+        if not milestone:
+            print('Didn\'t find a milestone matching "{}"'.format(version))
+            return None
+
+        issues = self.gh_repo.get_issues(milestone=milestone, state='all')
+        prs = []
+        for issue in issues:
+            if issue.pull_request is not None:
+                prs.append(issue.number)
+        return sorted(prs)
+
 
 def get_contributors(pr_data):
     commits = pr_data.get_commits()