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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-08-02 11:12:21 -0400
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-08-03 21:46:07 -0400
commit601185b43da638b1c74153deae01dbd518680889 (patch)
treeb4f1bc609e57e542a03ca00553098eabbb3b196b /src/systemctl/systemctl.c
parent75cd513ef830d8e00d0d2d6a64917fec533315db (diff)
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.
Diffstat (limited to 'src/systemctl/systemctl.c')
-rw-r--r--src/systemctl/systemctl.c57
1 files changed, 22 insertions, 35 deletions
diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
index 8ec0db2b2d..daf7e31de9 100644
--- a/src/systemctl/systemctl.c
+++ b/src/systemctl/systemctl.c
@@ -5432,7 +5432,7 @@ static int is_system_running(sd_bus *bus, char **args) {
return streq(state, "running") ? EXIT_SUCCESS : EXIT_FAILURE;
}
-static int systemctl_help(void) {
+static void systemctl_help(void) {
pager_open_if_enabled();
@@ -5557,12 +5557,9 @@ static int systemctl_help(void) {
" hibernate Hibernate the system\n"
" hybrid-sleep Hibernate and suspend the system\n",
program_invocation_short_name);
-
- return 0;
}
-static int halt_help(void) {
-
+static void halt_help(void) {
printf("%s [OPTIONS...]%s\n\n"
"%s the system.\n\n"
" --help Show this help\n"
@@ -5578,12 +5575,9 @@ static int halt_help(void) {
arg_action == ACTION_REBOOT ? "Reboot" :
arg_action == ACTION_POWEROFF ? "Power off" :
"Halt");
-
- return 0;
}
-static int shutdown_help(void) {
-
+static void shutdown_help(void) {
printf("%s [OPTIONS...] [TIME] [WALL...]\n\n"
"Shut down the system.\n\n"
" --help Show this help\n"
@@ -5595,12 +5589,9 @@ static int shutdown_help(void) {
" --no-wall Don't send wall message before halt/power-off/reboot\n"
" -c Cancel a pending shutdown\n",
program_invocation_short_name);
-
- return 0;
}
-static int telinit_help(void) {
-
+static void telinit_help(void) {
printf("%s [OPTIONS...] {COMMAND}\n\n"
"Send control commands to the init daemon.\n\n"
" --help Show this help\n"
@@ -5613,18 +5604,13 @@ static int telinit_help(void) {
" q, Q Reload init daemon configuration\n"
" u, U Reexecute init daemon\n",
program_invocation_short_name);
-
- return 0;
}
-static int runlevel_help(void) {
-
+static void runlevel_help(void) {
printf("%s [OPTIONS...]\n\n"
"Prints the previous and current runlevel of the init system.\n\n"
" --help Show this help\n",
program_invocation_short_name);
-
- return 0;
}
static void help_types(void) {
@@ -5719,12 +5705,13 @@ static int systemctl_parse_argv(int argc, char *argv[]) {
assert(argc >= 0);
assert(argv);
- while ((c = getopt_long(argc, argv, "ht:p:alqfs:H:M:n:o:ir", options, NULL)) >= 0) {
+ while ((c = getopt_long(argc, argv, "ht:p:alqfs:H:M:n:o:ir", options, NULL)) >= 0)
switch (c) {
case 'h':
- return systemctl_help();
+ systemctl_help();
+ return 0;
case ARG_VERSION:
puts(PACKAGE_STRING);
@@ -5992,7 +5979,6 @@ static int systemctl_parse_argv(int argc, char *argv[]) {
default:
assert_not_reached("Unhandled option");
}
- }
if (arg_transport != BUS_TRANSPORT_LOCAL && arg_scope != UNIT_FILE_SYSTEM) {
log_error("Cannot access user instance remotely.");
@@ -6032,11 +6018,12 @@ static int halt_parse_argv(int argc, char *argv[]) {
if (runlevel == '0' || runlevel == '6')
arg_force = 2;
- while ((c = getopt_long(argc, argv, "pfwdnih", options, NULL)) >= 0) {
+ while ((c = getopt_long(argc, argv, "pfwdnih", options, NULL)) >= 0)
switch (c) {
case ARG_HELP:
- return halt_help();
+ halt_help();
+ return 0;
case ARG_HALT:
arg_action = ACTION_HALT;
@@ -6079,7 +6066,6 @@ static int halt_parse_argv(int argc, char *argv[]) {
default:
assert_not_reached("Unhandled option");
}
- }
if (arg_action == ACTION_REBOOT && (argc == optind || argc == optind + 1)) {
r = update_reboot_param_file(argc == optind + 1 ? argv[optind] : NULL);
@@ -6164,11 +6150,12 @@ static int shutdown_parse_argv(int argc, char *argv[]) {
assert(argc >= 0);
assert(argv);
- while ((c = getopt_long(argc, argv, "HPrhkt:afFc", options, NULL)) >= 0) {
+ while ((c = getopt_long(argc, argv, "HPrhkt:afFc", options, NULL)) >= 0)
switch (c) {
case ARG_HELP:
- return shutdown_help();
+ shutdown_help();
+ return 0;
case 'H':
arg_action = ACTION_HALT;
@@ -6217,7 +6204,6 @@ static int shutdown_parse_argv(int argc, char *argv[]) {
default:
assert_not_reached("Unhandled option");
}
- }
if (argc > optind && arg_action != ACTION_CANCEL_SHUTDOWN) {
r = parse_time_spec(argv[optind], &arg_when);
@@ -6278,11 +6264,12 @@ static int telinit_parse_argv(int argc, char *argv[]) {
assert(argc >= 0);
assert(argv);
- while ((c = getopt_long(argc, argv, "", options, NULL)) >= 0) {
+ while ((c = getopt_long(argc, argv, "", options, NULL)) >= 0)
switch (c) {
case ARG_HELP:
- return telinit_help();
+ telinit_help();
+ return 0;
case ARG_NO_WALL:
arg_no_wall = true;
@@ -6294,10 +6281,10 @@ static int telinit_parse_argv(int argc, char *argv[]) {
default:
assert_not_reached("Unhandled option");
}
- }
if (optind >= argc) {
- telinit_help();
+ log_error("%s: required argument missing.",
+ program_invocation_short_name);
return -EINVAL;
}
@@ -6343,11 +6330,12 @@ static int runlevel_parse_argv(int argc, char *argv[]) {
assert(argc >= 0);
assert(argv);
- while ((c = getopt_long(argc, argv, "", options, NULL)) >= 0) {
+ while ((c = getopt_long(argc, argv, "", options, NULL)) >= 0)
switch (c) {
case ARG_HELP:
- return runlevel_help();
+ runlevel_help();
+ return 0;
case '?':
return -EINVAL;
@@ -6355,7 +6343,6 @@ static int runlevel_parse_argv(int argc, char *argv[]) {
default:
assert_not_reached("Unhandled option");
}
- }
if (optind < argc) {
log_error("Too many arguments.");