$ git clone -n https://src.fedoraproject.org/rpms/libkscreen.git /var/lib/mock/f42-build-870626-177260/root/chroot_tmpdir/scmroot/libkscreen
Cloning into '/var/lib/mock/f42-build-870626-177260/root/chroot_tmpdir/scmroot/libkscreen'...
$ git fetch origin cac92e9e5dd78b1531b1168b5d383b0ce3bab388:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libkscreen
 * [new ref]         cac92e9e5dd78b1531b1168b5d383b0ce3bab388 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cac92e9 6.3.0