The current output is not very explanatory:

    $ ptxdist package-info
    ptxdist: error: please use 'ptxdist' instead of calling make directly.
    make: *** [.../ptxdist/rules/other/Toplevel.make:55: all] Error 1

Signed-off-by: Roland Hieber <r...@pengutronix.de>
---
 bin/ptxdist | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/bin/ptxdist b/bin/ptxdist
index 75e503fe4767..01b8713727ce 100755
--- a/bin/ptxdist
+++ b/bin/ptxdist
@@ -1887,6 +1887,11 @@ EOF
                package-info)
                        declare -a pkgs
 
+                       if [ ${#} -eq 0 ]; then
+                               echo "Usage: package-info <packages...>"
+                               exit 1
+                       fi
+
                        check_config &&
                        check_deps &&
                        pkgs=( "${@/#/${STATEDIR}/}" ) &&
-- 
2.29.2


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