$ git clone -n https://src.fedoraproject.org/rpms/gcr.git /var/lib/mock/f45-build-9657-407/root/chroot_tmpdir/scmroot/gcr
Cloning into '/var/lib/mock/f45-build-9657-407/root/chroot_tmpdir/scmroot/gcr'...
$ git fetch origin c8857436872784501aa280798c24101829b21bee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gcr
 * [new ref]         c8857436872784501aa280798c24101829b21bee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c885743 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild