$ git clone -n https://src.fedoraproject.org/rpms/mupdf.git /var/lib/mock/f40-build-792363-138332/root/chroot_tmpdir/scmroot/mupdf
Cloning into '/var/lib/mock/f40-build-792363-138332/root/chroot_tmpdir/scmroot/mupdf'...
$ git fetch origin f76d98de93beea953ea707086474af27b44faeab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mupdf
 * [new ref]         f76d98de93beea953ea707086474af27b44faeab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f76d98d streamline make invocation