$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-gtn2-8288-24526/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-gtn2-8288-24526/root/chroot_tmpdir/scmroot/xapi'...
$ git reset --hard c644b1a6fdc35386c044a1eb85722a9ddf38eda6
fatal: Could not parse object 'c644b1a6fdc35386c044a1eb85722a9ddf38eda6'.