$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-ydi1-7954-23037/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-ydi1-7954-23037/root/chroot_tmpdir/scmroot/xapi'...
$ git reset --hard a90a4d5b9172702208eda60ae8af85bd5e8baa7c
fatal: Could not parse object 'a90a4d5b9172702208eda60ae8af85bd5e8baa7c'.