Modernize branch_changer.py script.

maintainer-scripts/ChangeLog:

	* branch_changer.py: Modernize and fix flake8 issues.
	* setup.cfg: New file.

1 files changed, 40 insertions, 30 deletions

diff --git a/maintainer-scripts/branch_changer.py b/maintainer-scripts/branch_changer.py
index b0580296c16..d7954361752 100755
--- a/maintainer-scripts/branch_changer.py
+++ b/maintainer-scripts/branch_changer.py
@@ -16,7 +16,8 @@
 #
 # Sample usages of the script:
 #
-# $ ./maintainer-scripts/branch_changer.py api_key --new-target-milestone=6.2:6.3 --comment '6.2 has been released....' --add-known-to-fail=6.2 --limit 3
+# $ ./maintainer-scripts/branch_changer.py api_key --new-target-milestone=6.2:6.3 \
+#       --comment '6.2 has been released....' --add-known-to-fail=6.2 --limit 3
 #
 # The invocation will set target milestone to 6.3 for all issues that
 # have mistone equal to 6.2. Apart from that, a comment is added to these
@@ -24,7 +25,8 @@
 # At maximum 3 issues will be modified and the script will run
 # in dry mode (no issues are modified), unless you append --doit option.
 #
-# $ ./maintainer-scripts/branch_changer.py api_key --new-target-milestone=5.5:6.3 --comment 'GCC 5 branch is being closed' --remove 5 --limit 3
+# $ ./maintainer-scripts/branch_changer.py api_key --new-target-milestone=5.5:6.3 \
+#       --comment 'GCC 5 branch is being closed' --remove 5 --limit 3
 #
 # Very similar to previous invocation, but instead of adding to known-to-fail,
 # '5' release is removed from all issues that have the regression prefix.
@@ -35,17 +37,19 @@
 # issues that contain '7' in its regression prefix.
 #
 
-import requests
-import json
 import argparse
+import json
 import re
 
-from semantic_version import Version
+import requests
+
+from semantic_version import SimpleSpec
 
 base_url = 'https://gcc.gnu.org/bugzilla/rest.cgi/'
 statuses = ['UNCONFIRMED', 'ASSIGNED', 'SUSPENDED', 'NEW', 'WAITING', 'REOPENED']
 search_summary = ' Regression]'
-regex = '(.*\[)([0-9\./]*)( [rR]egression])(.*)'
+regex = r'(.*\[)([0-9\./]*)( [rR]egression])(.*)'
+
 
 class Bug:
     def __init__(self, data):
@@ -59,7 +63,7 @@ class Bug:
 
     def parse_summary(self):
         m = re.match(regex, self.data['summary'])
-        if m != None:
+        if m:
             self.versions = m.group(2).split('/')
             self.is_regression = True
             self.regex_match = m
@@ -116,15 +120,16 @@ class Bug:
             print('  changing target milestone: "%s" to "%s" (same branch)' % (old_milestone, new_milestone))
         elif self.is_regression and new_major in self.versions:
             args['target_milestone'] = new_milestone
-            print('  changing target milestone: "%s" to "%s" (regresses with the new milestone)' % (old_milestone, new_milestone))
+            print('  changing target milestone: "%s" to "%s" (regresses with the new milestone)'
+                  % (old_milestone, new_milestone))
         else:
             print('  not changing target milestone: not a regression or does not regress with the new milestone')
 
-        if 'target_milestone' in args and comment != None:
+        if 'target_milestone' in args and comment:
             print('  adding comment: "%s"' % comment)
-            args['comment'] = {'comment': comment }
+            args['comment'] = {'comment': comment}
 
-        if new_fail_version != None:
+        if new_fail_version:
             if self.add_known_to_fail(new_fail_version):
                 s = self.serialize_known_to_fail()
                 print('  changing known_to_fail: "%s" to "%s"' % (self.data['cf_known_to_fail'], s))
@@ -137,8 +142,8 @@ class Bug:
             return False
 
     def serialize_summary(self):
-        assert self.versions != None
-        assert self.is_regression == True
+        assert not self.versions
+        assert self.is_regression
 
         new_version = '/'.join(self.versions)
         new_summary = self.regex_match.group(1) + new_version + self.regex_match.group(3) + self.regex_match.group(4)
@@ -146,19 +151,19 @@ class Bug:
 
     def serialize_known_to_fail(self):
         assert type(self.fail_versions) is list
-        return ', '.join(sorted(self.fail_versions, key = lambda x: Version(x, partial = True)))
+        return ', '.join(sorted(self.fail_versions, key=lambda x: SimpleSpec(x)))
 
     def modify_bug(self, api_key, params, doit):
         u = base_url + 'bug/' + str(self.data['id'])
 
         data = {
             'ids': [self.data['id']],
-            'api_key': api_key }
+            'api_key': api_key}
 
         data.update(params)
 
         if doit:
-            r = requests.put(u, data = json.dumps(data), headers = {"content-type": "text/javascript"})
+            r = requests.put(u, data=json.dumps(data), headers={'content-type': 'text/javascript'})
             print(r)
 
     @staticmethod
@@ -170,18 +175,19 @@ class Bug:
     @staticmethod
     def get_bugs(api_key, query):
         u = base_url + 'bug'
-        r = requests.get(u, params = query)
+        r = requests.get(u, params=query)
         return [Bug(x) for x in r.json()['bugs']]
 
+
 def search(api_key, remove, add, limit, doit):
     bugs = Bug.get_bugs(api_key, {'api_key': api_key, 'summary': search_summary, 'bug_status': statuses})
     bugs = list(filter(lambda x: x.is_regression, bugs))
 
     modified = 0
     for bug in bugs:
-        if remove != None:
+        if remove:
             bug.remove_release(remove)
-        if add != None:
+        if add:
             bug.add_release(add)
 
         if bug.update_summary(api_key, doit):
@@ -191,6 +197,7 @@ def search(api_key, remove, add, limit, doit):
 
     print('\nModified PRs: %d' % modified)
 
+
 def replace_milestone(api_key, limit, old_milestone, new_milestone, comment, add_known_to_fail, doit):
     bugs = Bug.get_bugs(api_key, {'api_key': api_key, 'bug_status': statuses, 'target_milestone': old_milestone})
 
@@ -203,23 +210,26 @@ def replace_milestone(api_key, limit, old_milestone, new_milestone, comment, add
 
     print('\nModified PRs: %d' % modified)
 
+
 parser = argparse.ArgumentParser(description='')
-parser.add_argument('api_key', help = 'API key')
-parser.add_argument('--remove', nargs = '?', help = 'Remove a release from summary')
-parser.add_argument('--add', nargs = '?', help = 'Add a new release to summary, e.g. 6:7 will add 7 where 6 is included')
-parser.add_argument('--limit', nargs = '?', help = 'Limit number of bugs affected by the script')
-parser.add_argument('--doit', action = 'store_true', help = 'Really modify BUGs in the bugzilla')
-parser.add_argument('--new-target-milestone', help = 'Set a new target milestone, e.g. 4.9.3:4.9.4 will set milestone to 4.9.4 for all PRs having milestone set to 4.9.3')
-parser.add_argument('--add-known-to-fail', help = 'Set a new known to fail for all PRs affected by --new-target-milestone')
-parser.add_argument('--comment', help = 'Comment a PR for which we set a new target milestore')
+parser.add_argument('api_key', help='API key')
+parser.add_argument('--remove', nargs='?', help='Remove a release from summary')
+parser.add_argument('--add', nargs='?', help='Add a new release to summary, e.g. 6:7 will add 7 where 6 is included')
+parser.add_argument('--limit', nargs='?', help='Limit number of bugs affected by the script')
+parser.add_argument('--doit', action='store_true', help='Really modify BUGs in the bugzilla')
+parser.add_argument('--new-target-milestone', help='Set a new target milestone, '
+                    'e.g. 4.9.3:4.9.4 will set milestone to 4.9.4 for all PRs having milestone set to 4.9.3')
+parser.add_argument('--add-known-to-fail', help='Set a new known to fail '
+                    'for all PRs affected by --new-target-milestone')
+parser.add_argument('--comment', help='Comment a PR for which we set a new target milestore')
 
 args = parser.parse_args()
 # Python3 does not have sys.maxint
-args.limit = int(args.limit) if args.limit != None else 10**10
+args.limit = int(args.limit) if args.limit else 10**10
 
-if args.remove != None or args.add != None:
+if args.remove or args.add:
     search(args.api_key, args.remove, args.add, args.limit, args.doit)
-if args.new_target_milestone != None:
+if args.new_target_milestone:
     t = args.new_target_milestone.split(':')
     assert len(t) == 2
     replace_milestone(args.api_key, args.limit, t[0], t[1], args.comment, args.add_known_to_fail, args.doit)