$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-pcoval2-10441-29001/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10441-29001/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin d2fded5498b5a6b44d92e25c1cbb86695439cc9e:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         d2fded5498b5a6b44d92e25c1cbb86695439cc9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d2fded5 bump release for test build