Use git-filter-repo to create meta-python2 layer with the history from meta-openembedded/meta-python

mk-meta-python2.sh

# 1. Start from a clean state
# 2. Clone bare meta-openembedded (local copy can be used to avoid cloning from upstream)
# 3. Clone local working copy of meta-openembedded-orig
# 4. Initialialize pristine meta-python2 repository
# 5. Copy git history from meta-openembedded-orig to meta-python2
# 6. Add original commit hash to all commits and add signed-off-by
# 7. Replace 'meta-python' string with 'meta-python2'
# 8. Fix cases where 'meta-python23' string was created
# 9. Update the 'home of python modules' string in README
# 10. Drop all python3-* files
# 11. Strip all directories except meta-python
# 12. Make the contents of meta-python become the root of meta-python2 repo
rm -rf meta-openembedded.git &&
rm -rf meta-python2 &&
rm -rf meta-openembedded-orig &&
git clone --bare git://git.openembedded.org/meta-openembedded.git meta-openembedded.git &&
git clone meta-openembedded.git meta-openembedded-orig &&
git init meta-python2 &&
git filter-repo --source meta-openembedded-orig --target meta-python2 &&
cd meta-python2 &&
git filter-repo \
  --commit-callback "
  user_name = b'Tim Orling'
  user_email = b'ticotimo@gmail.com'
  trailer = b'Signed-off-by: %s <%s>' % (user_name, user_email)
  first_match = False
  new_commit_message = b''
  for line in commit.message.splitlines():
    if re.match(b'Signed-off-by:', line) and not first_match:
      first_match = True
      new_commit_message += b'(From meta-openembedded commit: %s)\n\n' % (commit.original_id)
      new_commit_message += line + b'\n'
    else:
      new_commit_message += line + b'\n'
  new_commit_message += trailer
  commit.message = new_commit_message" \
  --blob-callback "
    blob.data = blob.data.replace(b'meta-python', b'meta-python2')
    blob.data = blob.data.replace(b'meta-python23', b'meta-python3')
    blob.data = blob.data.replace(b'home of python modules', b'home of legacy python2 modules')
  " \
  --filename-callback "
    if b'python3-' in filename:
      return None
    else:
      return filename" &&
git filter-repo --path meta-python &&
git filter-repo --subdirectory-filter meta-python