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From ced01b28f5e44cc708ae7af681919e4dc83da169 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Sun, 8 Dec 2013 07:46:46 -0500
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Subject: [PATCH] kernel-install: add -h/--help
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---
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 src/kernel-install/kernel-install | 21 ++++++++++++++-------
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 1 file changed, 14 insertions(+), 7 deletions(-)
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diff --git a/src/kernel-install/kernel-install b/src/kernel-install/kernel-install
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index 9d3e75d..f5ff362 100644
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--- a/src/kernel-install/kernel-install
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+++ b/src/kernel-install/kernel-install
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@@ -21,9 +21,9 @@
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 usage()
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 {
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-    echo "Usage:" >&2
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-    echo "        $0 add <kernel-version> <kernel-image>" >&2
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-    echo "        $0 remove <kernel-version> <kernel-image>" >&2
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+    echo "Usage:"
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+    echo "        $0 add KERNEL-VERSION KERNEL-IMAGE"
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+    echo "        $0 remove KERNEL-VERSION KERNEL-IMAGE"
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 }
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 dropindirs_sort()
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@@ -54,6 +54,13 @@ dropindirs_sort()
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 export LC_COLLATE=C
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+for i in "$@"; do
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+    if [ "$i" == "--help" -o "$i" == "-h" ]; then
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+        usage
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+        exit 0
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+    fi
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+done
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+
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 if [[ "${0##*/}" == 'installkernel' ]]; then
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     COMMAND='add'
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 else
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@@ -75,7 +82,7 @@ if ! [[ $MACHINE_ID ]]; then
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 fi
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 if [[ ! $COMMAND ]] || [[ ! $KERNEL_VERSION ]]; then
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-    usage
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+    echo "Not enough arguments" >&2
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     exit 1
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 fi
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@@ -90,8 +97,8 @@ readarray -t PLUGINS < <(
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 case $COMMAND in
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     add)
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-        if [[ ! $KERNEL_IMAGE ]]; then
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-            usage
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+        if [[ ! "$KERNEL_IMAGE" ]]; then
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+            echo "Command 'add' requires an argument" >&2
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             exit 1
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         fi
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@@ -121,7 +128,7 @@ case $COMMAND in
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         ;;
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     *)
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-        usage
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+        echo "Unknown command '$COMMAND'" >&2
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         exit 1
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         ;;
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 esac