$ git clone -n https://src.fedoraproject.org/rpms/plasma-breeze.git /var/lib/mock/f42-build-side-1-3578382-46814/root/chroot_tmpdir/scmroot/plasma-breeze
Cloning into '/var/lib/mock/f42-build-side-1-3578382-46814/root/chroot_tmpdir/scmroot/plasma-breeze'...
$ git fetch origin 091b05371a7ca31377db9eedce5c7deb2fec26a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-breeze
 * [new ref]         091b05371a7ca31377db9eedce5c7deb2fec26a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 091b053 6.4.1