$ git clone -n https://src.fedoraproject.org/rpms/ghc-explicit-exception.git /var/lib/mock/f38-build-side-42-init-devel-730425-27446/root/chroot_tmpdir/scmroot/ghc-explicit-exception
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-730425-27446/root/chroot_tmpdir/scmroot/ghc-explicit-exception'...
$ git fetch origin be9c1eb693e9391bd0309c95938bc7e49a2d8e02:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-explicit-exception
 * [new ref]         be9c1eb693e9391bd0309c95938bc7e49a2d8e02 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at be9c1eb Convert to %autorelease and %autochangelog