$ git clone -n https://github.com/xcp-ng-rpms/python-bitarray.git /var/lib/mock/v9.0-incoming-11260-29612/root/chroot_tmpdir/scmroot/python-bitarray
Cloning into '/var/lib/mock/v9.0-incoming-11260-29612/root/chroot_tmpdir/scmroot/python-bitarray'...
$ git fetch origin 91815c3ed111be1d7411a7d7b12cb2e4d67df8c6:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/python-bitarray
 * [new ref]         91815c3ed111be1d7411a7d7b12cb2e4d67df8c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91815c3 Import upstream sources.