$ git clone -n https://src.fedoraproject.org/rpms/jaxb-api2.git /var/lib/mock/f40-build-2192693-51471/root/chroot_tmpdir/scmroot/jaxb-api2
Cloning into '/var/lib/mock/f40-build-2192693-51471/root/chroot_tmpdir/scmroot/jaxb-api2'...
$ git fetch origin a9e8cf1e13c7ca4b2397c41cc9ae2849bb4b9369:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jaxb-api2
 * [new ref]         a9e8cf1e13c7ca4b2397c41cc9ae2849bb4b9369 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9e8cf1 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild