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compel: tell user what's wrong with usage

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In case our command line is not good, it's not enough to just show
usage info -- it is much better to explicitly say what's wrong.

Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Kir Kolyshkin
2016-12-08 01:44:17 -08:00
committed by Andrei Vagin
parent b73feb98db
commit 9fa2cda2cd
1 changed files with 7 additions and 0 deletions
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7
compel/src/main.c
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@@ -163,6 +163,8 @@ int main(int argc, char *argv[])
}
}
if (!current_cflags) {
fprintf(stderr, "Error: unknown arch '%s'\n",
optarg);
return usage(1);
}
break;
@@ -205,12 +207,14 @@ int main(int argc, char *argv[])
}
if (optind >= argc) {
fprintf(stderr, "Error: action argument required\n");
return usage(1);
}
action = argv[optind++];
if (!strcmp(action, "cflags")) {
if (!current_cflags) {
fprintf(stderr, "Error: option --arch required\n");
return usage(1);
}
printf("%s", current_cflags);
@@ -224,14 +228,17 @@ int main(int argc, char *argv[])
if (!strcmp(action, "hgen")) {
if (!opts.input_filename) {
fprintf(stderr, "Error: option --file required\n");
return usage(1);
}
if (!opts.output_filename) {
fprintf(stderr, "Error: option --output required\n");
return usage(1);
}
compel_log_init(&cli_log, log_level);
return piegen();
}
fprintf(stderr, "Error: unknown action '%s'\n", action);
return usage(1);
}