$ git clone -n https://github.com/xcp-ng-rpms/samba.git /var/lib/mock/v8.3-u-pcoval1-11118-29540/root/chroot_tmpdir/scmroot/samba
Cloning into '/var/lib/mock/v8.3-u-pcoval1-11118-29540/root/chroot_tmpdir/scmroot/samba'...
$ git fetch origin 0fb85ccc95e5e796e7c2fe77e6f6903c572247bd:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/samba
 * [new ref]         0fb85ccc95e5e796e7c2fe77e6f6903c572247bd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0fb85cc bump release for test build