$ git clone -n https://src.fedoraproject.org/rpms/jaxb.git /var/lib/mock/f42-build-3279304-41337/root/chroot_tmpdir/scmroot/jaxb
Cloning into '/var/lib/mock/f42-build-3279304-41337/root/chroot_tmpdir/scmroot/jaxb'...
$ git fetch origin d014646f9495d5c3fa1bcd080618ff572bf2e833:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jaxb
 * [new ref]         d014646f9495d5c3fa1bcd080618ff572bf2e833 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d014646 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild