$ git clone -n https://src.fedoraproject.org/rpms/ghc-vector-binary-instances.git /var/lib/mock/f38-build-side-42-init-devel-955833-28786/root/chroot_tmpdir/scmroot/ghc-vector-binary-instances
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-955833-28786/root/chroot_tmpdir/scmroot/ghc-vector-binary-instances'...
$ git fetch origin 5b08432d6edbf27ebea7de44957a2677087933d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-vector-binary-instances
 * [new ref]         5b08432d6edbf27ebea7de44957a2677087933d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b08432 Convert to %autorelease and %autochangelog