$ git clone -n https://src.fedoraproject.org/rpms/ghc-cprng-aes.git /var/lib/mock/f41-build-side-1-2805269-32863/root/chroot_tmpdir/scmroot/ghc-cprng-aes
Cloning into '/var/lib/mock/f41-build-side-1-2805269-32863/root/chroot_tmpdir/scmroot/ghc-cprng-aes'...
$ git fetch origin aff8600494f8f031da3de9fe48dcc789f2620d19:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cprng-aes
 * [new ref]         aff8600494f8f031da3de9fe48dcc789f2620d19 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aff8600 retire: FTBFS and deprecated upstream