$ git clone -n https://src.fedoraproject.org/rpms/plasma-systemmonitor.git /var/lib/mock/f39-build-1601314-38560/root/chroot_tmpdir/scmroot/plasma-systemmonitor
Cloning into '/var/lib/mock/f39-build-1601314-38560/root/chroot_tmpdir/scmroot/plasma-systemmonitor'...
$ git fetch origin 49981af11e31e180c23733e1df10a71efd848a55:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-systemmonitor
 * [new ref]         49981af11e31e180c23733e1df10a71efd848a55 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49981af 5.27.9