$ git clone -n https://src.fedoraproject.org/rpms/ghc-persistent.git /var/lib/mock/f38-build-side-42-init-devel-1072555-29786/root/chroot_tmpdir/scmroot/ghc-persistent
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1072555-29786/root/chroot_tmpdir/scmroot/ghc-persistent'...
$ git fetch origin b3f53d7a05cb3562aaef880c6e689e45ef623302:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-persistent
 * [new ref]         b3f53d7a05cb3562aaef880c6e689e45ef623302 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b3f53d7 update to 2.13.3.5