$ git clone -n https://github.com/xcp-ng-rpms/systemd /var/lib/mock/dev-testing-147-75/root/chroot_tmpdir/scmroot/systemd
Cloning into '/var/lib/mock/dev-testing-147-75/root/chroot_tmpdir/scmroot/systemd'...
$ git reset --hard master
Downloading SOURCES/systemd-219.tar.xz (3.9 MB)
HEAD is now at a490fcb Import systemd-219-19.el7_2.7.xs7.3.src.rpm