$ git clone -n https://src.fedoraproject.org/rpms/ghc-IOSpec.git /var/lib/mock/f45-build-9912-411/root/chroot_tmpdir/scmroot/ghc-IOSpec
Cloning into '/var/lib/mock/f45-build-9912-411/root/chroot_tmpdir/scmroot/ghc-IOSpec'...
$ git fetch origin 864f6eb2344f0c6f0803bd0d00344a6bf9750c2b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-IOSpec
 * [new ref]         864f6eb2344f0c6f0803bd0d00344a6bf9750c2b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 864f6eb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild