$ git clone -n https://github.com/xcp-ng-rpms/xs-opam-repo.git /var/lib/mock/v8.3-u-brs2-5032-6368/root/chroot_tmpdir/scmroot/xs-opam-repo
Cloning into '/var/lib/mock/v8.3-u-brs2-5032-6368/root/chroot_tmpdir/scmroot/xs-opam-repo'...
$ git reset --hard 758e17e0153d2e3d734f6007caeee6e858f452bd
Downloading SOURCES/xs-opam-repo-6.66.0.tar.gz (15 MB)
HEAD is now at 758e17e toto