$ git clone -n https://src.fedoraproject.org/rpms/ghc-http-media.git /var/lib/mock/f38-build-side-42-init-devel-797044-28051/root/chroot_tmpdir/scmroot/ghc-http-media
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-797044-28051/root/chroot_tmpdir/scmroot/ghc-http-media'...
$ git fetch origin c9159817f283dbffe195d8bdd00b800879a32fd5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-http-media
 * [new ref]         c9159817f283dbffe195d8bdd00b800879a32fd5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c915981 Convert to %autorelease and %autochangelog