$ git clone -n https://src.fedoraproject.org/rpms/jflex.git /var/lib/mock/f41-build-1706045-24578/root/chroot_tmpdir/scmroot/jflex
Cloning into '/var/lib/mock/f41-build-1706045-24578/root/chroot_tmpdir/scmroot/jflex'...
$ git fetch origin 22e90fad0c362a47cbc9343806559db901dc5d78:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jflex
 * [new ref]         22e90fad0c362a47cbc9343806559db901dc5d78 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 22e90fa Install license files in licensedir instead of docdir