$ git clone -n https://src.fedoraproject.org/rpms/compat-guile18.git /var/lib/mock/f45-build-5656-341/root/chroot_tmpdir/scmroot/compat-guile18
Cloning into '/var/lib/mock/f45-build-5656-341/root/chroot_tmpdir/scmroot/compat-guile18'...
$ git fetch origin 40c113fc2afcfe465207ccaa24fe4cef4ffe8956:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/compat-guile18
 * [new ref]         40c113fc2afcfe465207ccaa24fe4cef4ffe8956 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 40c113f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild