$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-deps.git /var/lib/mock/v8.3-u-pcoval2-10895-29390/root/chroot_tmpdir/scmroot/xcp-ng-deps
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10895-29390/root/chroot_tmpdir/scmroot/xcp-ng-deps'...
$ git fetch origin c742fde6e000dfc5500790b58e037b04a1994e6a:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-deps
 * [new ref]         c742fde6e000dfc5500790b58e037b04a1994e6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c742fde bump release for test build