$ git clone -n https://src.fedoraproject.org/rpms/jaxb-istack-commons.git /var/lib/mock/f40-build-2349027-60154/root/chroot_tmpdir/scmroot/jaxb-istack-commons
Cloning into '/var/lib/mock/f40-build-2349027-60154/root/chroot_tmpdir/scmroot/jaxb-istack-commons'...
$ git fetch origin b89a6785173bc6f76d836c8133ce374c52b4505e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jaxb-istack-commons
 * [new ref]         b89a6785173bc6f76d836c8133ce374c52b4505e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b89a678 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild