$ git clone -n https://src.fedoraproject.org/rpms/composefs.git /var/lib/mock/f45-build-4419-332/root/chroot_tmpdir/scmroot/composefs
Cloning into '/var/lib/mock/f45-build-4419-332/root/chroot_tmpdir/scmroot/composefs'...
$ git fetch origin 1a4ddae43166534edc7fe50e74984f70989b7fe1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/composefs
 * [new ref]         1a4ddae43166534edc7fe50e74984f70989b7fe1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a4ddae Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild