$ git clone -n https://src.fedoraproject.org/rpms/borgmatic.git /var/lib/mock/f40-build-2721160-73074/root/chroot_tmpdir/scmroot/borgmatic
Cloning into '/var/lib/mock/f40-build-2721160-73074/root/chroot_tmpdir/scmroot/borgmatic'...
$ git fetch origin 5cddc1074d059d5a6e4007bbca53f1ee783ba265:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/borgmatic
 * [new ref]         5cddc1074d059d5a6e4007bbca53f1ee783ba265 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5cddc10 update to 1.8.9