$ git clone -n https://src.fedoraproject.org/rpms/ghc-concurrent-output.git /var/lib/mock/f38-build-side-42-init-devel-890283-28528/root/chroot_tmpdir/scmroot/ghc-concurrent-output
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-890283-28528/root/chroot_tmpdir/scmroot/ghc-concurrent-output'...
$ git fetch origin b97b899f0f4f9322679659d69301944daacf4b1f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-concurrent-output
 * [new ref]         b97b899f0f4f9322679659d69301944daacf4b1f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b97b899 Convert to %autorelease and %autochangelog