$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-generic-lib.git /var/lib/mock/v8.3-base-4080-3976/root/chroot_tmpdir/scmroot/xcp-ng-generic-lib
Cloning into '/var/lib/mock/v8.3-base-4080-3976/root/chroot_tmpdir/scmroot/xcp-ng-generic-lib'...
$ git reset --hard 12d938aa23b3d40f1b0ddd3ca2724ce22fc689aa
fatal: Could not parse object '12d938aa23b3d40f1b0ddd3ca2724ce22fc689aa'.