Unify parse_argv style

getopt is usually good at printing out a nice error message when
commandline options are invalid. It distinguishes between an unknown
option and a known option with a missing arg. It is better to let it
do its job and not use opterr=0 unless we actually want to suppress
messages. So remove opterr=0 in the few places where it wasn't really
useful.

When an error in options is encountered, we should not print a lengthy
help() and overwhelm the user, when we know precisely what is wrong
with the commandline. In addition, since help() prints to stdout, it
should not be used except when requested with -h or --help.

Also, simplify things here and there.

1 files changed, 10 insertions, 12 deletions

diff --git a/src/ask-password/ask-password.c b/src/ask-password/ask-password.c
index 4d5690c2c0..5c37cffc22 100644
--- a/src/ask-password/ask-password.c
+++ b/src/ask-password/ask-password.c
@@ -50,8 +50,7 @@ static usec_t arg_timeout = DEFAULT_TIMEOUT_USEC;
 static bool arg_accept_cached = false;
 static bool arg_multiple = false;
 
-static int help(void) {
-
+static void help(void) {
         printf("%s [OPTIONS...] MESSAGE\n\n"
                "Query the user for a system passphrase, via the TTY or an UI agent.\n\n"
                "  -h --help          Show this help\n"
@@ -60,10 +59,8 @@ static int help(void) {
                "     --no-tty        Ask question via agent even on TTY\n"
                "     --accept-cached Accept cached passwords\n"
                "     --multiple      List multiple passwords if available\n"
-               "     --id=ID         Query identifier (e.g. cryptsetup:/dev/sda5)\n",
-               program_invocation_short_name);
-
-        return 0;
+               "     --id=ID         Query identifier (e.g. cryptsetup:/dev/sda5)\n"
+               , program_invocation_short_name);
 }
 
 static int parse_argv(int argc, char *argv[]) {
@@ -93,12 +90,13 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argc >= 0);
         assert(argv);
 
-        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
+        while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 
                 switch (c) {
 
                 case 'h':
-                        return help();
+                        help();
+                        return 0;
 
                 case ARG_ICON:
                         arg_icon = optarg;
@@ -133,10 +131,9 @@ static int parse_argv(int argc, char *argv[]) {
                 default:
                         assert_not_reached("Unhandled option");
                 }
-        }
 
-        if (optind != argc-1) {
-                help();
+        if (optind != argc - 1) {
+                log_error("%s: required argument missing.", program_invocation_short_name);
                 return -EINVAL;
         }
 
@@ -151,7 +148,8 @@ int main(int argc, char *argv[]) {
         log_parse_environment();
         log_open();
 
-        if ((r = parse_argv(argc, argv)) <= 0)
+        r = parse_argv(argc, argv);
+        if (r <= 0)
                 goto finish;
 
         if (arg_timeout > 0)