$ git clone -n https://src.fedoraproject.org/rpms/javassist.git /var/lib/mock/f41-build-1627329-24124/root/chroot_tmpdir/scmroot/javassist
Cloning into '/var/lib/mock/f41-build-1627329-24124/root/chroot_tmpdir/scmroot/javassist'...
$ git fetch origin b5ac1e817659a660368fb57ef6f6fa17679b8531:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/javassist
 * [new ref]         b5ac1e817659a660368fb57ef6f6fa17679b8531 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5ac1e8 Rebuilt for java-21-openjdk as system jdk