$ git clone -n https://src.fedoraproject.org/rpms/kf5-messagelib.git /var/lib/mock/f40-build-2218533-52601/root/chroot_tmpdir/scmroot/kf5-messagelib
Cloning into '/var/lib/mock/f40-build-2218533-52601/root/chroot_tmpdir/scmroot/kf5-messagelib'...
$ git fetch origin 13494ea49776d8db6562d66cb703d6f2ceae6a75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-messagelib
 * [new ref]         13494ea49776d8db6562d66cb703d6f2ceae6a75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 13494ea Fix translations and package them in the libs subpackage