$ git clone -n https://src.fedoraproject.org/rpms/jowl.git /var/lib/mock/f39-build-1601985-38564/root/chroot_tmpdir/scmroot/jowl
Cloning into '/var/lib/mock/f39-build-1601985-38564/root/chroot_tmpdir/scmroot/jowl'...
$ git fetch origin 5817c6a1b8185f97bc75f0ec5daaabe74823a688:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jowl
 * [new ref]         5817c6a1b8185f97bc75f0ec5daaabe74823a688 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5817c6a Add missing sources and fix changelog