$ git clone -n https://src.fedoraproject.org/rpms/ghc-maccatcher.git /var/lib/mock/f45-build-10514-418/root/chroot_tmpdir/scmroot/ghc-maccatcher
Cloning into '/var/lib/mock/f45-build-10514-418/root/chroot_tmpdir/scmroot/ghc-maccatcher'...
$ git fetch origin 27985cf47b44cb73f839894bc7b130756a40286d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-maccatcher
 * [new ref]         27985cf47b44cb73f839894bc7b130756a40286d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27985cf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild