$ git clone -n https://github.com/xcp-ng-rpms/vmfs6-tools.git /var/lib/mock/v8.3-incoming-9121-27948/root/chroot_tmpdir/scmroot/vmfs6-tools
Cloning into '/var/lib/mock/v8.3-incoming-9121-27948/root/chroot_tmpdir/scmroot/vmfs6-tools'...
$ git fetch origin 62c9f92bf0637d908feaae622051ba0531002fb0:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/vmfs6-tools
 * [new ref]         62c9f92bf0637d908feaae622051ba0531002fb0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62c9f92 Add gcc in breqs so it builds in our koji