From a0ef84f6583dbf427ff5a3534528e1e72bd00137 Mon Sep 17 00:00:00 2001
From: sibeream <aegorenkov.91@gmail.com>
Date: Tue, 23 Feb 2021 20:25:26 +0100
Subject: Flag allow-no-sensors added.

---
 prog/sensors/main.c    | 32 ++++++++++++++++++++------------
 prog/sensors/sensors.1 |  2 ++
 2 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/prog/sensors/main.c b/prog/sensors/main.c
index f535b665..a19b919e 100644
--- a/prog/sensors/main.c
+++ b/prog/sensors/main.c
@@ -54,15 +54,16 @@ static void print_short_help(void)
 static void print_long_help(void)
 {
 	printf("Usage: %s [OPTION]... [CHIP]...\n", PROGRAM);
-	puts("  -c, --config-file     Specify a config file\n"
-	     "  -h, --help            Display this help text\n"
-	     "  -s, --set             Execute `set' statements (root only)\n"
-	     "  -f, --fahrenheit      Show temperatures in degrees fahrenheit\n"
-	     "  -A, --no-adapter      Do not show adapter for each chip\n"
-	     "      --bus-list        Generate bus statements for sensors.conf\n"
-	     "  -u                    Raw output\n"
-	     "  -j                    Json output\n"
-	     "  -v, --version         Display the program version\n"
+	puts("  -c, --config-file      Specify a config file\n"
+	     "  -h, --help             Display this help text\n"
+	     "  -s, --set              Execute `set' statements (root only)\n"
+	     "  -f, --fahrenheit       Show temperatures in degrees fahrenheit\n"
+	     "  -A, --no-adapter       Do not show adapter for each chip\n"
+	     "      --bus-list         Generate bus statements for sensors.conf\n"
+	     "  -u                     Raw output\n"
+	     "  -j                     Json output\n"
+	     "  -v, --version          Display the program version\n"
+	     "  -n, --allow-no-sensors Do not fail if no sensors found\n"
 	     "\n"
 	     "Use `-' after `-c' to read the config file from stdin.\n"
 	     "If no chips are specified, all chip info will be printed.\n"
@@ -270,7 +271,7 @@ static void print_bus_list(void)
 
 int main(int argc, char *argv[])
 {
-	int c, i, err, do_bus_list;
+	int c, i, err, do_bus_list, allow_no_sensors;
 	const char *config_file_name = NULL;
 
 	struct option long_opts[] =  {
@@ -281,6 +282,7 @@ int main(int argc, char *argv[])
 		{ "no-adapter", no_argument, NULL, 'A' },
 		{ "config-file", required_argument, NULL, 'c' },
 		{ "bus-list", no_argument, NULL, 'B' },
+		{ "allow-no-sensors", no_argument, NULL, 'n' },
 		{ 0, 0, 0, 0 }
 	};
 
@@ -291,8 +293,9 @@ int main(int argc, char *argv[])
 	do_sets = 0;
 	do_bus_list = 0;
 	hide_adapter = 0;
+	allow_no_sensors = 0;
 	while (1) {
-		c = getopt_long(argc, argv, "hsvfAc:uj", long_opts, NULL);
+		c = getopt_long(argc, argv, "hsvfAc:ujn", long_opts, NULL);
 		if (c == EOF)
 			break;
 		switch(c) {
@@ -327,6 +330,9 @@ int main(int argc, char *argv[])
 		case 'B':
 			do_bus_list = 1;
 			break;
+		case 'n':
+			allow_no_sensors = 1;
+			break;
 		default:
 			fprintf(stderr,
 				"Internal error while parsing options!\n");
@@ -349,7 +355,9 @@ int main(int argc, char *argv[])
 				"No sensors found!\n"
 				"Make sure you loaded all the kernel drivers you need.\n"
 				"Try sensors-detect to find out which these are.\n");
-			err = 1;
+			if (!allow_no_sensors) {
+				err = 1;
+			}
 		}
 	} else {
 		int cnt = 0;
diff --git a/prog/sensors/sensors.1 b/prog/sensors/sensors.1
index 7d66e4b3..d207aa1b 100644
--- a/prog/sensors/sensors.1
+++ b/prog/sensors/sensors.1
@@ -78,6 +78,8 @@ are only needed if you have several chips sharing the same address on different
 buses of the same type. As bus numbers are usually not guaranteed to be stable
 over reboots, these statements let you refer to each bus by its name rather
 than numbers.
+.IP "-n, --allow-no-sensors"
+Do not fail if no sensors found. The error message will be printed in the log.
 .SH FILES
 .I /etc/sensors3.conf
 .br
-- 
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