$ git clone -n https://src.fedoraproject.org/rpms/mupdf.git /var/lib/mock/f41-build-814885-149286/root/chroot_tmpdir/scmroot/mupdf
Cloning into '/var/lib/mock/f41-build-814885-149286/root/chroot_tmpdir/scmroot/mupdf'...
$ git fetch origin 586b6b44972d7a44a9d777f364b4ce39dc1b7f73:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mupdf
 * [new ref]         586b6b44972d7a44a9d777f364b4ce39dc1b7f73 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 586b6b4 Rebuild for tesseract-5.4.1