$ git clone -n https://github.com/xcp-ng-rpms/autoconf.git /var/lib/mock/v8.3-u-pcoval1-11004-29437/root/chroot_tmpdir/scmroot/autoconf
Cloning into '/var/lib/mock/v8.3-u-pcoval1-11004-29437/root/chroot_tmpdir/scmroot/autoconf'...
$ git fetch origin ca4be86aa29a500b289c2b196e5a094d36ccec12:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/autoconf
 * [new ref]         ca4be86aa29a500b289c2b196e5a094d36ccec12 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca4be86 bump release for test build