$ git clone -n https://gitee.com/geliwei/mupdf.git /var/lib/mock/dist-an23-build-552731-88923/root/chroot_tmpdir/scmroot/mupdf
Cloning into '/var/lib/mock/dist-an23-build-552731-88923/root/chroot_tmpdir/scmroot/mupdf'...
$ git fetch origin 51bbcff084de967ed1f90d4eaef317c338483a64:KOJI_FETCH_HEAD
From https://gitee.com/geliwei/mupdf
 * [new ref]         51bbcff084de967ed1f90d4eaef317c338483a64 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51bbcff fix: CVE-2023-51104 divide-by-zero in pnm_binary_read_image() of load-pnm.c