$ git clone -n https://src.fedoraproject.org/rpms/ghc9.0.git /var/lib/mock/f38-build-side-42-init-devel-1364595-30702/root/chroot_tmpdir/scmroot/ghc9.0
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1364595-30702/root/chroot_tmpdir/scmroot/ghc9.0'...
$ git fetch origin b94ac30b646203ecf33bb93269a61500abe7ab63:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc9.0
 * [new ref]         b94ac30b646203ecf33bb93269a61500abe7ab63 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b94ac30 move shared library into ghc libdir