netdev - [PATCH iproute2 v2] ip: Simplify executing ip cmd within network ns

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Date:	Thu, 11 Dec 2014 15:38:23 +0200
From:	Vadim Kochan <vadim4j@...il.com>
To:	netdev@...r.kernel.org
Cc:	Vadim Kochan <vadim4j@...il.com>
Subject: [PATCH iproute2 v2] ip: Simplify executing ip cmd within network ns

From: Vadim Kochan <vadim4j@...il.com>

Added new '-netns' option to simplify executing following cmd:

    ip netns exec NETNS ip OPTIONS COMMAND OBJECT

    to

    ip -n[etns] NETNS OPTIONS COMMAND OBJECT

e.g.:

    ip -net vnet0 link add br0 type bridge
    ip -n vnet0 link

Signed-off-by: Vadim Kochan <vadim4j@...il.com>
---
Changes v1 -> v2
    use -n[etns] option name: suggested by Nicolas Dichtel
    changed man ip.8 page

 ip/ip.c        |  6 ++++++
 ip/ip_common.h |  1 +
 ip/ipnetns.c   |  2 +-
 man/man8/ip.8  | 24 +++++++++++++++++++++++-
 4 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/ip/ip.c b/ip/ip.c
index 5f759d5..f3c2cdb 100644
--- a/ip/ip.c
+++ b/ip/ip.c
@@ -262,6 +262,12 @@ int main(int argc, char **argv)
 			rcvbuf = size;
 		} else if (matches(opt, "-help") == 0) {
 			usage();
+		} else if (matches(opt, "-netns") == 0) {
+			argc--;
+			argv++;
+			argv[0] = argv[1];
+			argv[1] = basename;
+			return netns_exec(argc, argv);
 		} else {
 			fprintf(stderr, "Option \"%s\" is unknown, try \"ip -help\".\n", opt);
 			exit(-1);
diff --git a/ip/ip_common.h b/ip/ip_common.h
index 75bfb82..d4f7e1f 100644
--- a/ip/ip_common.h
+++ b/ip/ip_common.h
@@ -88,6 +88,7 @@ struct link_util
 struct link_util *get_link_kind(const char *kind);
 struct link_util *get_link_slave_kind(const char *slave_kind);
 int get_netns_fd(const char *name);
+int netns_exec(int argc, char **argv);
 
 #ifndef	INFINITY_LIFE_TIME
 #define     INFINITY_LIFE_TIME      0xFFFFFFFFU
diff --git a/ip/ipnetns.c b/ip/ipnetns.c
index 1c8aa02..367841c 100644
--- a/ip/ipnetns.c
+++ b/ip/ipnetns.c
@@ -129,7 +129,7 @@ static void bind_etc(const char *name)
 	closedir(dir);
 }
 
-static int netns_exec(int argc, char **argv)
+int netns_exec(int argc, char **argv)
 {
 	/* Setup the proper environment for apps that are not netns
 	 * aware, and execute a program in that environment.
diff --git a/man/man8/ip.8 b/man/man8/ip.8
index 2d42e98..389c808 100644
--- a/man/man8/ip.8
+++ b/man/man8/ip.8
@@ -31,7 +31,8 @@ ip \- show / manipulate routing, devices, policy routing and tunnels
 \fB\-r\fR[\fIesolve\fR] |
 \fB\-f\fR[\fIamily\fR] {
 .BR inet " | " inet6 " | " ipx " | " dnet " | " link " } | "
-\fB\-o\fR[\fIneline\fR] }
+\fB\-o\fR[\fIneline\fR] |
+\fB\-n\fR[\fIetns\fR] }
 
 
 .SH OPTIONS
@@ -134,6 +135,27 @@ the output.
 use the system's name resolver to print DNS names instead of
 host addresses.
 
+.TP
+.BR "\-n" , " \-net" , " \-netns " <NETNS>
+executes the following
+.RI "[ " OPTIONS " ] " OBJECT " { " COMMAND " | "
+.BR help " }"
+in the specified network namespace
+.IR NETNS .
+Actually it just simplifies executing of:
+
+.B ip netns exec
+.IR NETNS
+.B ip
+.RI "[ " OPTIONS " ] " OBJECT " { " COMMAND " | "
+.BR help " }"
+
+to
+
+.B ip
+.RI "-n[etns] " NETNS " [ " OPTIONS " ] " OBJECT " { " COMMAND " | "
+.BR help " }"
+
 .SH IP - COMMAND SYNTAX
 
 .SS
-- 
2.1.3

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