diff --git a/release/update-manpages b/release/update-manpages
index 739cedb..0402ad6 100755
--- a/release/update-manpages
+++ b/release/update-manpages
@@ -18,107 +18,8 @@
 This is intended to be run before every official Repo release.
 """
 
-from pathlib import Path
-from functools import partial
-import argparse
-import multiprocessing
-import os
-import re
-import shutil
-import subprocess
 import sys
-import tempfile
 
-TOPDIR = Path(__file__).resolve().parent.parent
-MANDIR = TOPDIR.joinpath('man')
+import update_manpages
 
-# Load repo local modules.
-sys.path.insert(0, str(TOPDIR))
-from git_command import RepoSourceVersion
-import subcmds
-
-def worker(cmd, **kwargs):
-  subprocess.run(cmd, **kwargs)
-
-def main(argv):
-  parser = argparse.ArgumentParser(description=__doc__)
-  opts = parser.parse_args(argv)
-
-  if not shutil.which('help2man'):
-    sys.exit('Please install help2man to continue.')
-
-  # Let repo know we're generating man pages so it can avoid some dynamic
-  # behavior (like probing active number of CPUs).  We use a weird name &
-  # value to make it less likely for users to set this var themselves.
-  os.environ['_REPO_GENERATE_MANPAGES_'] = ' indeed! '
-
-  # "repo branch" is an alias for "repo branches".
-  del subcmds.all_commands['branch']
-  (MANDIR / 'repo-branch.1').write_text('.so man1/repo-branches.1')
-
-  version = RepoSourceVersion()
-  cmdlist = [['help2man', '-N', '-n', f'repo {cmd} - manual page for repo {cmd}',
-    '-S', f'repo {cmd}', '-m', 'Repo Manual', f'--version-string={version}',
-    '-o', MANDIR.joinpath(f'repo-{cmd}.1.tmp'), './repo',
-    '-h', f'help {cmd}'] for cmd in subcmds.all_commands]
-  cmdlist.append(['help2man', '-N', '-n', 'repository management tool built on top of git',
-    '-S', 'repo', '-m', 'Repo Manual', f'--version-string={version}',
-    '-o', MANDIR.joinpath('repo.1.tmp'), './repo',
-    '-h', '--help-all'])
-
-  with tempfile.TemporaryDirectory() as tempdir:
-    tempdir = Path(tempdir)
-    repo_dir = tempdir / '.repo'
-    repo_dir.mkdir()
-    (repo_dir / 'repo').symlink_to(TOPDIR)
-
-    # Create a repo wrapper using the active Python executable.  We can't pass
-    # this directly to help2man as it's too simple, so insert it via shebang.
-    data = (TOPDIR / 'repo').read_text(encoding='utf-8')
-    tempbin = tempdir / 'repo'
-    tempbin.write_text(f'#!{sys.executable}\n' + data, encoding='utf-8')
-    tempbin.chmod(0o755)
-
-    # Run all cmd in parallel, and wait for them to finish.
-    with multiprocessing.Pool() as pool:
-      pool.map(partial(worker, cwd=tempdir, check=True), cmdlist)
-
-  for tmp_path in MANDIR.glob('*.1.tmp'):
-    path = tmp_path.parent / tmp_path.stem
-    old_data = path.read_text() if path.exists() else ''
-
-    data = tmp_path.read_text()
-    tmp_path.unlink()
-
-    data = replace_regex(data)
-
-    # If the only thing that changed was the date, don't refresh.  This avoids
-    # a lot of noise when only one file actually updates.
-    old_data = re.sub(r'^(\.TH REPO "1" ")([^"]+)', r'\1', old_data, flags=re.M)
-    new_data = re.sub(r'^(\.TH REPO "1" ")([^"]+)', r'\1', data, flags=re.M)
-    if old_data != new_data:
-      path.write_text(data)
-
-
-def replace_regex(data):
-  """Replace semantically null regexes in the data.
-
-  Args:
-    data: manpage text.
-
-  Returns:
-    Updated manpage text.
-  """
-  regex = (
-      (r'(It was generated by help2man) [0-9.]+', '\g<1>.'),
-      (r'^\033\[[0-9;]*m([^\033]*)\033\[m', '\g<1>'),
-      (r'^\.IP\n(.*:)\n', '.SS \g<1>\n'),
-      (r'^\.PP\nDescription', '.SH DETAILS'),
-  )
-  for pattern, replacement in regex:
-    data = re.sub(pattern, replacement, data, flags=re.M)
-  return data
-
-
-if __name__ == '__main__':
-  sys.exit(main(sys.argv[1:]))
+sys.exit(update_manpages.main(sys.argv[1:]))
diff --git a/release/update_manpages.py b/release/update_manpages.py
new file mode 100644
index 0000000..9cbb43b
--- /dev/null
+++ b/release/update_manpages.py
@@ -0,0 +1,119 @@
+# Copyright (C) 2021 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 generating manual page for all repo commands.
+
+Most code lives in this module so it can be unittested.
+"""
+
+from pathlib import Path
+from functools import partial
+import argparse
+import multiprocessing
+import os
+import re
+import shutil
+import subprocess
+import sys
+import tempfile
+
+TOPDIR = Path(__file__).resolve().parent.parent
+MANDIR = TOPDIR.joinpath('man')
+
+# Load repo local modules.
+sys.path.insert(0, str(TOPDIR))
+from git_command import RepoSourceVersion
+import subcmds
+
+def worker(cmd, **kwargs):
+  subprocess.run(cmd, **kwargs)
+
+def main(argv):
+  parser = argparse.ArgumentParser(description=__doc__)
+  opts = parser.parse_args(argv)
+
+  if not shutil.which('help2man'):
+    sys.exit('Please install help2man to continue.')
+
+  # Let repo know we're generating man pages so it can avoid some dynamic
+  # behavior (like probing active number of CPUs).  We use a weird name &
+  # value to make it less likely for users to set this var themselves.
+  os.environ['_REPO_GENERATE_MANPAGES_'] = ' indeed! '
+
+  # "repo branch" is an alias for "repo branches".
+  del subcmds.all_commands['branch']
+  (MANDIR / 'repo-branch.1').write_text('.so man1/repo-branches.1')
+
+  version = RepoSourceVersion()
+  cmdlist = [['help2man', '-N', '-n', f'repo {cmd} - manual page for repo {cmd}',
+    '-S', f'repo {cmd}', '-m', 'Repo Manual', f'--version-string={version}',
+    '-o', MANDIR.joinpath(f'repo-{cmd}.1.tmp'), './repo',
+    '-h', f'help {cmd}'] for cmd in subcmds.all_commands]
+  cmdlist.append(['help2man', '-N', '-n', 'repository management tool built on top of git',
+    '-S', 'repo', '-m', 'Repo Manual', f'--version-string={version}',
+    '-o', MANDIR.joinpath('repo.1.tmp'), './repo',
+    '-h', '--help-all'])
+
+  with tempfile.TemporaryDirectory() as tempdir:
+    tempdir = Path(tempdir)
+    repo_dir = tempdir / '.repo'
+    repo_dir.mkdir()
+    (repo_dir / 'repo').symlink_to(TOPDIR)
+
+    # Create a repo wrapper using the active Python executable.  We can't pass
+    # this directly to help2man as it's too simple, so insert it via shebang.
+    data = (TOPDIR / 'repo').read_text(encoding='utf-8')
+    tempbin = tempdir / 'repo'
+    tempbin.write_text(f'#!{sys.executable}\n' + data, encoding='utf-8')
+    tempbin.chmod(0o755)
+
+    # Run all cmd in parallel, and wait for them to finish.
+    with multiprocessing.Pool() as pool:
+      pool.map(partial(worker, cwd=tempdir, check=True), cmdlist)
+
+  for tmp_path in MANDIR.glob('*.1.tmp'):
+    path = tmp_path.parent / tmp_path.stem
+    old_data = path.read_text() if path.exists() else ''
+
+    data = tmp_path.read_text()
+    tmp_path.unlink()
+
+    data = replace_regex(data)
+
+    # If the only thing that changed was the date, don't refresh.  This avoids
+    # a lot of noise when only one file actually updates.
+    old_data = re.sub(r'^(\.TH REPO "1" ")([^"]+)', r'\1', old_data, flags=re.M)
+    new_data = re.sub(r'^(\.TH REPO "1" ")([^"]+)', r'\1', data, flags=re.M)
+    if old_data != new_data:
+      path.write_text(data)
+
+
+def replace_regex(data):
+  """Replace semantically null regexes in the data.
+
+  Args:
+    data: manpage text.
+
+  Returns:
+    Updated manpage text.
+  """
+  regex = (
+      (r'(It was generated by help2man) [0-9.]+', '\g<1>.'),
+      (r'^\033\[[0-9;]*m([^\033]*)\033\[m', '\g<1>'),
+      (r'^\.IP\n(.*:)\n', '.SS \g<1>\n'),
+      (r'^\.PP\nDescription', '.SH DETAILS'),
+  )
+  for pattern, replacement in regex:
+    data = re.sub(pattern, replacement, data, flags=re.M)
+  return data
diff --git a/tests/test_update_manpages.py b/tests/test_update_manpages.py
index f0ef72a..0de85be 100644
--- a/tests/test_update_manpages.py
+++ b/tests/test_update_manpages.py
@@ -15,7 +15,8 @@
 """Unittests for the update_manpages module."""
 
 import unittest
-import tests.update_manpages as um
+
+from release import update_manpages
 
 
 class UpdateManpagesTest(unittest.TestCase):
@@ -24,4 +25,4 @@
   def test_replace_regex(self):
     """Check that replace_regex works."""
     data = '\n\033[1mSummary\033[m\n'
-    self.assertEqual(um.replace_regex(data),'\nSummary\n')
+    self.assertEqual(update_manpages.replace_regex(data),'\nSummary\n')
diff --git a/tests/update_manpages.py b/tests/update_manpages.py
deleted file mode 120000
index e89c5d8..0000000
--- a/tests/update_manpages.py
+++ /dev/null
@@ -1 +0,0 @@
-../release/update-manpages
\ No newline at end of file