ip link: Shortify printing the usage of link type
Allow to print particular link type usage by:
ip link help [TYPE]
Currently to print usage for some link type it is needed
to use the following way:
ip link { add | del | set } type TYPE help
Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
diff --git a/ip/link_vti.c b/ip/link_vti.c
index 6274c83..59ac4c4 100644
--- a/ip/link_vti.c
+++ b/ip/link_vti.c
@@ -24,17 +24,22 @@
#include "tunnel.h"
+static void print_usage(FILE *f)
+{
+ fprintf(f, "Usage: ip link { add | set | change | replace | del } NAME\n");
+ fprintf(f, " type { vti } [ remote ADDR ] [ local ADDR ]\n");
+ fprintf(f, " [ [i|o]key KEY ]\n");
+ fprintf(f, " [ dev PHYS_DEV ]\n");
+ fprintf(f, "\n");
+ fprintf(f, "Where: NAME := STRING\n");
+ fprintf(f, " ADDR := { IP_ADDRESS }\n");
+ fprintf(f, " KEY := { DOTTED_QUAD | NUMBER }\n");
+}
+
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
- fprintf(stderr, "Usage: ip link { add | set | change | replace | del } NAME\n");
- fprintf(stderr, " type { vti } [ remote ADDR ] [ local ADDR ]\n");
- fprintf(stderr, " [ [i|o]key KEY ]\n");
- fprintf(stderr, " [ dev PHYS_DEV ]\n");
- fprintf(stderr, "\n");
- fprintf(stderr, "Where: NAME := STRING\n");
- fprintf(stderr, " ADDR := { IP_ADDRESS }\n");
- fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n");
+ print_usage(stderr);
exit(-1);
}
@@ -240,9 +245,16 @@
}
}
+static void vti_print_help(struct link_util *lu, int argc, char **argv,
+ FILE *f)
+{
+ print_usage(f);
+}
+
struct link_util vti_link_util = {
.id = "vti",
.maxattr = IFLA_VTI_MAX,
.parse_opt = vti_parse_opt,
.print_opt = vti_print_opt,
+ .print_help = vti_print_help,
};