$ git clone -n https://src.fedoraproject.org/rpms/jaxb.git /var/lib/mock/f39-build-1567794-37600/root/chroot_tmpdir/scmroot/jaxb
Cloning into '/var/lib/mock/f39-build-1567794-37600/root/chroot_tmpdir/scmroot/jaxb'...
$ git fetch origin 262f9f4ec969c6eebb4c066e19bea8027d25beb6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jaxb
 * [new ref]         262f9f4ec969c6eebb4c066e19bea8027d25beb6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 262f9f4 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild