release: import some helper scripts for managing official releases

Change-Id: I9abebfef5ad19f6a637bc3b12effea9dd6d0269d
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/256234
Tested-by: Mike Frysinger <vapier@google.com>
Reviewed-by: David Pursehouse <dpursehouse@collab.net>

1 files changed, 135 insertions, 0 deletions

diff --git a/release/sign-tag.py b/release/sign-tag.py
new file mode 100755
index 00000000..7b4b4cab
--- /dev/null
+++ b/release/sign-tag.py
@@ -0,0 +1,135 @@
+#!/usr/bin/env python3
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Helper tool for signing repo release tags correctly.
+
+This is intended to be run only by the official Repo release managers.
+"""
+
+import argparse
+import os
+import re
+import subprocess
+import sys
+
+import util
+
+
+# We currently sign with the old DSA key as it's been around the longest.
+# We should transition to RSA by Jun 2020, and ECC by Jun 2021.
+KEYID = util.KEYID_DSA
+
+# Regular expression to validate tag names.
+RE_VALID_TAG = r'^v([0-9]+[.])+[0-9]+$'
+
+
+def sign(opts):
+  """Tag the commit & sign it!"""
+  # We use ! at the end of the key so that gpg uses this specific key.
+  # Otherwise it uses the key as a lookup into the overall key and uses the
+  # default signing key.  i.e. It will see that KEYID_RSA is a subkey of
+  # another key, and use the primary key to sign instead of the subkey.
+  cmd = ['git', 'tag', '-s', opts.tag, '-u', f'{opts.key}!',
+         '-m', f'repo {opts.tag}', opts.commit]
+
+  key = 'GNUPGHOME'
+  print('+', f'export {key}="{opts.gpgdir}"')
+  oldvalue = os.getenv(key)
+  os.putenv(key, opts.gpgdir)
+  util.run(opts, cmd)
+  if oldvalue is None:
+    os.unsetenv(key)
+  else:
+    os.putenv(key, oldvalue)
+
+
+def check(opts):
+  """Check the signature."""
+  util.run(opts, ['git', 'tag', '--verify', opts.tag])
+
+
+def postmsg(opts):
+  """Helpful info to show at the end for release manager."""
+  cmd = ['git', 'rev-parse', 'remotes/origin/stable']
+  ret = util.run(opts, cmd, encoding='utf-8', stdout=subprocess.PIPE)
+  current_release = ret.stdout.strip()
+
+  cmd = ['git', 'log', '--format=%h (%aN) %s', '--no-merges',
+         f'remotes/origin/stable..{opts.tag}']
+  ret = util.run(opts, cmd, encoding='utf-8', stdout=subprocess.PIPE)
+  shortlog = ret.stdout.strip()
+
+  print(f"""
+Here's the short log since the last release.
+{shortlog}
+
+To push release to the public:
+  git push origin {opts.commit}:stable {opts.tag} -n
+NB: People will start upgrading to this version immediately.
+
+To roll back a release:
+  git push origin --force {current_release}:stable -n
+""")
+
+
+def get_parser():
+  """Get a CLI parser."""
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.add_argument('-n', '--dry-run',
+                      dest='dryrun', action='store_true',
+                      help='show everything that would be done')
+  parser.add_argument('--gpgdir',
+                      default=os.path.join(util.HOMEDIR, '.gnupg', 'repo'),
+                      help='path to dedicated gpg dir with release keys '
+                           '(default: ~/.gnupg/repo/)')
+  parser.add_argument('-f', '--force', action='store_true',
+                      help='force signing of any tag')
+  parser.add_argument('--keyid', dest='key',
+                      help='alternative signing key to use')
+  parser.add_argument('tag',
+                      help='the tag to create (e.g. "v2.0")')
+  parser.add_argument('commit', default='HEAD', nargs='?',
+                      help='the commit to tag')
+  return parser
+
+
+def main(argv):
+  """The main func!"""
+  parser = get_parser()
+  opts = parser.parse_args(argv)
+
+  if not os.path.exists(opts.gpgdir):
+    parser.error(f'--gpgdir does not exist: {opts.gpgdir}')
+
+  if not opts.force and not re.match(RE_VALID_TAG, opts.tag):
+    parser.error(f'tag "{opts.tag}" does not match regex "{RE_VALID_TAG}"; '
+                 'use --force to sign anyways')
+
+  if opts.key:
+    print(f'Using custom key to sign: {opts.key}')
+  else:
+    print('Using official Repo release key to sign')
+    opts.key = KEYID
+    util.import_release_key(opts)
+
+  sign(opts)
+  check(opts)
+  postmsg(opts)
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv[1:]))