$ git clone -n https://src.fedoraproject.org/rpms/jaxb-istack-commons.git /var/lib/mock/f39-build-1567802-37600/root/chroot_tmpdir/scmroot/jaxb-istack-commons
Cloning into '/var/lib/mock/f39-build-1567802-37600/root/chroot_tmpdir/scmroot/jaxb-istack-commons'...
$ git fetch origin ea0c4a72baa40be6a065e7b7140bc38a9965fdb7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jaxb-istack-commons
 * [new ref]         ea0c4a72baa40be6a065e7b7140bc38a9965fdb7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea0c4a7 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild