$ git clone -n https://src.fedoraproject.org/rpms/ghc-libffi.git /var/lib/mock/f38-build-side-42-init-devel-730676-27447/root/chroot_tmpdir/scmroot/ghc-libffi
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-730676-27447/root/chroot_tmpdir/scmroot/ghc-libffi'...
$ git fetch origin 72724280c457d66faa128312a2ddd8b7e401eddc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-libffi
 * [new ref]         72724280c457d66faa128312a2ddd8b7e401eddc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7272428 Convert to %autorelease and %autochangelog