$ git clone -n https://src.fedoraproject.org/rpms/javacc.git /var/lib/mock/f40-build-2600555-63131/root/chroot_tmpdir/scmroot/javacc
Cloning into '/var/lib/mock/f40-build-2600555-63131/root/chroot_tmpdir/scmroot/javacc'...
$ git fetch origin aadb8ea57d2bcd81ee8e9dda50b808aacec4e32d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/javacc
 * [new ref]         aadb8ea57d2bcd81ee8e9dda50b808aacec4e32d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aadb8ea Rebuilt for java-21-openjdk as system jdk