pasta can identify a netns as a "name", which is to say a path relative to
(usually) /run/netns, which is the place that ip(8) creates persistent
network namespaces.  Alternatively a full path to a netns can be given.

The --nsrun-dir option allows the user to change the standard path where
netns names are resolved.  However, there's no real point to this, if the
user wants to override the location of the netns, they can just as easily
use the full path to specify the netns.

Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
 conf.c  | 24 ++++--------------------
 passt.1 |  6 ------
 2 files changed, 4 insertions(+), 26 deletions(-)

diff --git a/conf.c b/conf.c
index 6770be9..e76181c 100644
--- a/conf.c
+++ b/conf.c
@@ -510,14 +510,13 @@ static int conf_ns_check(void *arg)
 /**
  * conf_ns_opt() - Open network, user namespaces descriptors from configuration
  * @c:			Execution context
- * @nsdir:		--nsrun-dir argument, can be an empty string
  * @conf_userns:	--userns argument, can be an empty string
  * @optarg:		PID, path or name of namespace
  *
  * Return: 0 on success, negative error code otherwise
  */
 static int conf_ns_opt(struct ctx *c,
-		       char *nsdir, const char *conf_userns, const char *optarg)
+		       const char *conf_userns, const char *optarg)
 {
 	int ufd = -1, nfd = -1, try, ret, netns_only_reset = c->netns_only;
 	char userns[PATH_MAX] = { 0 }, netns[PATH_MAX];
@@ -557,7 +556,7 @@ static int conf_ns_opt(struct ctx *c,
 				continue;
 		} else if (try == 2) {
 			ret = snprintf(netns, PATH_MAX, "%s/%s",
-				 *nsdir ? nsdir : NETNS_RUN_DIR, optarg);
+				       NETNS_RUN_DIR, optarg);
 			if (ret <= 0 || ret > (int)sizeof(netns))
 				continue;
 		}
@@ -859,8 +858,6 @@ pasta_opts:
 	info(   "  --userns NSPATH 	Target user namespace to join");
 	info(   "  --netns-only		Don't join existing user namespace");
 	info(   "    implied if PATH or NAME are given without --userns");
-	info(   "  --nsrun-dir		Directory for nsfs mountpoints");
-	info(   "    default: " NETNS_RUN_DIR);
 	info(   "  --config-net		Configure tap interface in namespace");
 	info(   "  --ns-mac-addr ADDR	Set MAC address on tap interface");
 
@@ -1040,7 +1037,6 @@ void conf(struct ctx *c, int argc, char **argv)
 		{"udp-ns",	required_argument,	NULL,		'U' },
 		{"userns",	required_argument,	NULL,		2 },
 		{"netns-only",	no_argument,		&c->netns_only,	1 },
-		{"nsrun-dir",	required_argument,	NULL,		3 },
 		{"config-net",	no_argument,		&c->pasta_conf_ns, 1 },
 		{"ns-mac-addr",	required_argument,	NULL,		4 },
 		{"dhcp-dns",	no_argument,		NULL,		5 },
@@ -1054,7 +1050,7 @@ void conf(struct ctx *c, int argc, char **argv)
 		{ 0 },
 	};
 	struct get_bound_ports_ns_arg ns_ports_arg = { .c = c };
-	char nsdir[PATH_MAX] = { 0 }, userns[PATH_MAX] = { 0 };
+	char userns[PATH_MAX] = { 0 };
 	enum conf_port_type tcp_tap = 0, tcp_init = 0;
 	enum conf_port_type udp_tap = 0, udp_init = 0;
 	bool v4_only = false, v6_only = false;
@@ -1093,18 +1089,6 @@ void conf(struct ctx *c, int argc, char **argv)
 				usage(argv[0]);
 			}
 			break;
-		case 3:
-			if (c->mode != MODE_PASTA) {
-				err("--nsrun-dir is for pasta mode only");
-				usage(argv[0]);
-			}
-
-			ret = snprintf(nsdir, sizeof(nsdir), "%s", optarg);
-			if (ret <= 0 || ret >= (int)sizeof(nsdir)) {
-				err("Invalid nsrun-dir: %s", optarg);
-				usage(argv[0]);
-			}
-			break;
 		case 4:
 			if (c->mode != MODE_PASTA) {
 				err("--ns-mac-addr is for pasta mode only");
@@ -1461,7 +1445,7 @@ void conf(struct ctx *c, int argc, char **argv)
 	check_root(c);
 
 	if (c->mode == MODE_PASTA && optind + 1 == argc) {
-		ret = conf_ns_opt(c, nsdir, userns, argv[optind]);
+		ret = conf_ns_opt(c, userns, argv[optind]);
 		if (ret == -ENOENT)
 			err("Namespace %s not found", argv[optind]);
 		if (ret < 0)
diff --git a/passt.1 b/passt.1
index 78b10b8..bbdadc1 100644
--- a/passt.1
+++ b/passt.1
@@ -458,12 +458,6 @@ without \-\-userns.
 If the target network namespace is bound to the filesystem (that is, if PATH or
 NAME are given as target), do not exit once the network namespace is deleted.
 
-.TP
-.BR \-\-nsrun-dir " " \fIpath
-Directory for nsfs mountpoints, used as path prefix for names of namespaces.
-
-The default path is shown with --help.
-
 .TP
 .BR \-\-config-net
 Configure networking in the namespace: set up addresses and routes as configured
-- 
2.37.2