$ git clone -n https://src.fedoraproject.org/rpms/ghc-show.git /var/lib/mock/f45-build-10756-424/root/chroot_tmpdir/scmroot/ghc-show
Cloning into '/var/lib/mock/f45-build-10756-424/root/chroot_tmpdir/scmroot/ghc-show'...
$ git fetch origin 526688549a45603db36764f10d2e6903f5f9b6b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-show
 * [new ref]         526688549a45603db36764f10d2e6903f5f9b6b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5266885 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild