$ git clone -n https://src.fedoraproject.org/rpms/guidelines-support-library.git /var/lib/mock/f45-build-13239-447/root/chroot_tmpdir/scmroot/guidelines-support-library
Cloning into '/var/lib/mock/f45-build-13239-447/root/chroot_tmpdir/scmroot/guidelines-support-library'...
$ git fetch origin 982cf5a437453e272728852501b0ac0dda437073:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guidelines-support-library
 * [new ref]         982cf5a437453e272728852501b0ac0dda437073 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 982cf5a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild