$ git clone -n https://src.fedoraproject.org/rpms/javassist.git /var/lib/mock/f39-build-2500861-61676/root/chroot_tmpdir/scmroot/javassist
Cloning into '/var/lib/mock/f39-build-2500861-61676/root/chroot_tmpdir/scmroot/javassist'...
$ git fetch origin 07b1f70ace8a9ceaddf2392039eb0e4ea3740aa8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/javassist
 * [new ref]         07b1f70ace8a9ceaddf2392039eb0e4ea3740aa8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 07b1f70 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild