lsns: add --output-all option

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

bash-completion/lsns

@@ -40,6 +40,7 @@ _lsns_module()
 					--list
 					--noheadings
 					--output
+					--output-all
 					--task
 					--raw
 					--notruncate

sys-utils/lsns.8

@@ -51,6 +51,9 @@ to get a list of all supported columns.
 The default list of columns may be extended if \fIlist\fP is
 specified in the format \fB+\fIlist\fP (e.g. \fBlsns \-o +PATH\fP).
 .TP
+.B \-\-output\-all
+Output all available columns.
+.TP
 .BR \-p , " \-\-task " \fIpid\fP
 Display only the namespaces held by the process with this \fIpid\fR.
 .TP

sys-utils/lsns.c

@@ -906,6 +906,7 @@ static void __attribute__((__noreturn__)) usage(void)
 	fputs(_(" -l, --list             use list format output\n"), out);
 	fputs(_(" -n, --noheadings       don't print headings\n"), out);
 	fputs(_(" -o, --output <list>    define which output columns to use\n"), out);
+	fputs(_("     --output-all       output all columns\n"), out);
 	fputs(_(" -p, --task <pid>       print process namespaces\n"), out);
 	fputs(_(" -r, --raw              use the raw output format\n"), out);
 	fputs(_(" -u, --notruncate       don't truncate text in columns\n"), out);
@@ -931,11 +932,15 @@ int main(int argc, char *argv[])
 	int c;
 	int r = 0;
 	char *outarg = NULL;
+	enum {
+		OPT_OUTPUT_ALL = CHAR_MAX + 1
+	};
 	static const struct option long_opts[] = {
 		{ "json",       no_argument,       NULL, 'J' },
 		{ "task",       required_argument, NULL, 'p' },
 		{ "help",	no_argument,       NULL, 'h' },
 		{ "output",     required_argument, NULL, 'o' },
+		{ "output-all", no_argument,       NULL, OPT_OUTPUT_ALL },
 		{ "notruncate", no_argument,       NULL, 'u' },
 		{ "version",    no_argument,       NULL, 'V' },
 		{ "noheadings", no_argument,       NULL, 'n' },
@@ -980,6 +985,10 @@ int main(int argc, char *argv[])
 		case 'o':
 			outarg = optarg;
 			break;
+		case OPT_OUTPUT_ALL:
+			for (ncolumns = 0; ncolumns < ARRAY_SIZE(infos); ncolumns++)
+				columns[ncolumns] = ncolumns;
+			break;
 		case 'V':
 			printf(UTIL_LINUX_VERSION);
 			return EXIT_SUCCESS;