$ git clone -n https://github.com/xcp-ng-rpms/systemd.git /var/lib/mock/v8.3-base-3859-3805/root/chroot_tmpdir/scmroot/systemd
Cloning into '/var/lib/mock/v8.3-base-3859-3805/root/chroot_tmpdir/scmroot/systemd'...
$ git reset --hard 5af6bd096fe63a9e9e9ab2cfa78f901b3659cbf2
Downloading SOURCES/systemd-219.tar.gz (4.8 MB)
HEAD is now at 5af6bd0 Merge branch 'XS-8.3'