$ git clone -n https://src.fedoraproject.org/rpms/ghc-silently.git /var/lib/mock/f45-build-10762-424/root/chroot_tmpdir/scmroot/ghc-silently
Cloning into '/var/lib/mock/f45-build-10762-424/root/chroot_tmpdir/scmroot/ghc-silently'...
$ git fetch origin 08a7d0f06f0c2e69c6af275f324a932ebab2ac86:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-silently
 * [new ref]         08a7d0f06f0c2e69c6af275f324a932ebab2ac86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08a7d0f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild