$ git clone -n https://src.fedoraproject.org/rpms/jaxb-api.git /var/lib/mock/f38-build-side-42-init-devel-746993-27660/root/chroot_tmpdir/scmroot/jaxb-api
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-746993-27660/root/chroot_tmpdir/scmroot/jaxb-api'...
$ git fetch origin 84b5fbaefefc9ecc48db8780ff54c4490febebf6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jaxb-api
 * [new ref]         84b5fbaefefc9ecc48db8780ff54c4490febebf6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 84b5fba Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild