$ git clone -n https://src.fedoraproject.org/rpms/ghc-fgl.git /var/lib/mock/f38-build-side-42-init-devel-763727-27709/root/chroot_tmpdir/scmroot/ghc-fgl
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-763727-27709/root/chroot_tmpdir/scmroot/ghc-fgl'...
$ git fetch origin a9f7e88064c56fb588a1aa6a0d9d896febb4dba8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-fgl
 * [new ref]         a9f7e88064c56fb588a1aa6a0d9d896febb4dba8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9f7e88 Convert to %autorelease and %autochangelog