$ git clone -n https://src.fedoraproject.org/rpms/ghc-magic.git /var/lib/mock/f45-build-10520-418/root/chroot_tmpdir/scmroot/ghc-magic
Cloning into '/var/lib/mock/f45-build-10520-418/root/chroot_tmpdir/scmroot/ghc-magic'...
$ git fetch origin 9f941e5c5bbbe39088834a1cb9a6180da901b51e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-magic
 * [new ref]         9f941e5c5bbbe39088834a1cb9a6180da901b51e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f941e5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild