$ git clone -n https://src.fedoraproject.org/rpms/git-extras.git /var/lib/mock/f45-build-11063-426/root/chroot_tmpdir/scmroot/git-extras
Cloning into '/var/lib/mock/f45-build-11063-426/root/chroot_tmpdir/scmroot/git-extras'...
$ git fetch origin 65badeb8ae8a87d8eeb05c6bab44ed1b8eed1c99:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/git-extras
 * [new ref]         65badeb8ae8a87d8eeb05c6bab44ed1b8eed1c99 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65badeb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild