$ git clone -n https://src.fedoraproject.org/rpms/jc.git /var/lib/mock/f39-build-1766342-41501/root/chroot_tmpdir/scmroot/jc
Cloning into '/var/lib/mock/f39-build-1766342-41501/root/chroot_tmpdir/scmroot/jc'...
$ git fetch origin 5a69c388fcd18ae0c67ed2953cd8febb1c15a1d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jc
 * [new ref]         5a69c388fcd18ae0c67ed2953cd8febb1c15a1d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a69c38 Update to v1.23.6