$ git clone -n https://src.fedoraproject.org/rpms/javapackages-bootstrap.git /var/lib/mock/f39-build-1650060-40479/root/chroot_tmpdir/scmroot/javapackages-bootstrap
Cloning into '/var/lib/mock/f39-build-1650060-40479/root/chroot_tmpdir/scmroot/javapackages-bootstrap'...
$ git fetch origin 302a2d6fc850ae97ca2d4c4e15dd17e6e4bda554:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/javapackages-bootstrap
 * [new ref]         302a2d6fc850ae97ca2d4c4e15dd17e6e4bda554 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 302a2d6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild