$ git clone -n https://src.fedoraproject.org/rpms/grip.git /var/lib/mock/f45-build-13045-446/root/chroot_tmpdir/scmroot/grip
Cloning into '/var/lib/mock/f45-build-13045-446/root/chroot_tmpdir/scmroot/grip'...
$ git fetch origin 212c34b689f700a57425b633133a719d5b5a1f91:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grip
 * [new ref]         212c34b689f700a57425b633133a719d5b5a1f91 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 212c34b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild