$ git clone -n https://src.fedoraproject.org/rpms/kdecoration.git /var/lib/mock/f42-build-862492-170829/root/chroot_tmpdir/scmroot/kdecoration
Cloning into '/var/lib/mock/f42-build-862492-170829/root/chroot_tmpdir/scmroot/kdecoration'...
$ git fetch origin ea91d016f994d8dba6887c0e5b4a4ceb074f99f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdecoration
 * [new ref]         ea91d016f994d8dba6887c0e5b4a4ceb074f99f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea91d01 6.2.4