$ git clone -n https://src.fedoraproject.org/rpms/ghc-snap-core.git /var/lib/mock/f45-build-10773-424/root/chroot_tmpdir/scmroot/ghc-snap-core
Cloning into '/var/lib/mock/f45-build-10773-424/root/chroot_tmpdir/scmroot/ghc-snap-core'...
$ git fetch origin bf5cd4edb918a0b949a79f94bb02c1969a12496a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-snap-core
 * [new ref]         bf5cd4edb918a0b949a79f94bb02c1969a12496a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf5cd4e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild