$ git clone -n https://src.fedoraproject.org/rpms/stringtemplate4.git /var/lib/mock/f38-build-side-42-init-devel-696619-27002/root/chroot_tmpdir/scmroot/stringtemplate4
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-696619-27002/root/chroot_tmpdir/scmroot/stringtemplate4'...
$ git fetch origin b0425c78e38c120de4cb56d923432f359b0cd861:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/stringtemplate4
 * [new ref]         b0425c78e38c120de4cb56d923432f359b0cd861 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0425c7 Version 4.3.4.