$ git clone -n https://src.fedoraproject.org/rpms/antlr.git /var/lib/mock/f41-build-side-1-3065345-38602/root/chroot_tmpdir/scmroot/antlr
Cloning into '/var/lib/mock/f41-build-side-1-3065345-38602/root/chroot_tmpdir/scmroot/antlr'...
$ git fetch origin 3e1ccd32bd80ffcda84be291845a4b21edc54ad9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/antlr
 * [new ref]         3e1ccd32bd80ffcda84be291845a4b21edc54ad9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e1ccd3 Switch javapackages tests to f41 branch