$ git clone -n https://github.com/xcp-ng-rpms/xenserver-firstboot.git /var/lib/mock/v8.1-base-1883-1281/root/chroot_tmpdir/scmroot/xenserver-firstboot
Cloning into '/var/lib/mock/v8.1-base-1883-1281/root/chroot_tmpdir/scmroot/xenserver-firstboot'...
$ git reset --hard 44b22b56e7c09e1b78e6a3f1504190724329ba76
Downloading SOURCES/xenserver-firstboot-1.0.14.tar.gz (14 KB)
HEAD is now at 44b22b5 Merge branch 'XS-8.1'