Do not parse all nvidia-smi output, use --query-gpu option.

src/sysdeps/linux.c

@@ -3084,7 +3084,7 @@ static gboolean
 sensors_nvidia_smi_read(gboolean setup)
 	{
 	gint		n = 0;
-	gchar		*args[] = { "nvidia-smi", "-q", "-a", NULL };
+	gchar		*args[] = { "nvidia-smi", "--format=csv", "--query-gpu=temperature.gpu", NULL };
 	gchar		*str, *stmp, id[64];
 	gchar		*output = NULL;
 	gchar		*errout = NULL;
@@ -3109,61 +3109,23 @@ sensors_nvidia_smi_read(gboolean setup)
 	if (result && output)
 			{
 			str = output;
-			/* Look for GPU N: or GPU X:Y:Z sections, but avoid GPU : lines
-			|  Recent nvidia-smi output looks like (eg 270.41.06):
-			|
-			|	GPU 0:3:0
-			|		Product Name                : GeForce GTX 460
-			|	...
-			|	Temperature
-			|		Gpu                     : 32 C
-			|
-			| Older nvidia-smi output was like (eg 260.19.29):
-			|
-			|	GPU 0:
-			|		Product Name            : GeForce GTX 285
-			|		...
-			|		Temperature             : 65 C
-			|		Fan Speed               : 100%
-			|		Utilization
-			|			GPU                 : 84%
-			|			...
-			*/
-			while ((str = g_strstr_len(str, -1, "GPU ")) != NULL)
+			/* nvidia-smi --format=csv --query-gpu=temperature.gpu:
+			 * temperature.gpu
+			 * 52
+			 */
+			if (sscanf(str, "temperature.gpu\n%f", &temp) == 1)
 				{
-				str += 3;
-				if (   sscanf(str, " %63s", id) != 1
-				    || !strcmp(id, ":")
-				   )
-					continue;
-				if ((str = g_strstr_len(str, -1, "Temperature")) != NULL)
+			    if (setup)
 					{
-					str += 11;
-					if (sscanf(str, " : %f", &temp) != 1)
-						{
-						stmp = str;
-						str = g_strstr_len(str, -1, "Gpu");
-						if (!str)
-							{
-							str = stmp;
-							continue;
-							}
-						str += 3;
-						if (sscanf(str, " : %f", &temp) != 1)
-							continue;
-						}
-					if (setup)
-						{
-						smi = g_new0(NvidiaSmi, 1);
-						smi->id = g_strdup(id);
-						smi->temp = temp;
-						nvidia_smi_list = g_list_append(nvidia_smi_list, smi);
-						sensors_nvidia_smi_add(smi);
-						++n;
-						}
-					else if ((smi = nvidia_smi_lookup(id)) != NULL)
-						smi->temp = temp;
+					smi = g_new0(NvidiaSmi, 1);
+					smi->id = g_strdup(id);
+					smi->temp = temp;
+					nvidia_smi_list = g_list_append(nvidia_smi_list, smi);
+					sensors_nvidia_smi_add(smi);
+					++n;
 					}
+				else if ((smi = nvidia_smi_lookup(id)) != NULL)
+					smi->temp = temp;
 				}
 			}
 	if (output)