$ git clone -n https://src.fedoraproject.org/rpms/ant.git /var/lib/mock/f42-build-3339146-41426/root/chroot_tmpdir/scmroot/ant
Cloning into '/var/lib/mock/f42-build-3339146-41426/root/chroot_tmpdir/scmroot/ant'...
$ git fetch origin 051f558c87f993f9e2164286413f75194fee0de9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ant
 * [new ref]         051f558c87f993f9e2164286413f75194fee0de9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 051f558 Remove javadoc subpackage