[PATCH] pasta: include errno in error message

[Paul Holzinger <pholzing@redhat.com>]

When the open() or setns() calls fails pasta exits early and prints an
error. However it did not include the errno so it was impossible to know
why the syscall failed.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>
---
 pasta.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/pasta.c b/pasta.c
index 13ab18b..27809d2 100644
--- a/pasta.c
+++ b/pasta.c
@@ -136,14 +136,14 @@ void pasta_open_ns(struct ctx *c, const char *netns)
 
 	nfd = open(netns, O_RDONLY | O_CLOEXEC);
 	if (nfd < 0)
-		die("Couldn't open network namespace %s", netns);
+		die("Couldn't open network namespace %s: %s", netns, strerror(errno));
 
 	c->pasta_netns_fd = nfd;
 
 	NS_CALL(ns_check, c);
 
 	if (c->pasta_netns_fd < 0)
-		die("Couldn't switch to pasta namespaces");
+		die("Couldn't switch to pasta namespaces: %s", strerror(errno));
 
 	if (!c->no_netns_quit) {
 		char buf[PATH_MAX] = { 0 };
@@ -261,7 +261,7 @@ void pasta_start_ns(struct ctx *c, uid_t uid, gid_t gid,
 
 	NS_CALL(pasta_wait_for_ns, c);
 	if (c->pasta_netns_fd < 0)
-		die("Failed to join network namespace");
+		die("Failed to join network namespace: %s", strerror(errno));
 }
 
 /**
-- 
@@ -136,14 +136,14 @@ void pasta_open_ns(struct ctx *c, const char *netns)
 
 	nfd = open(netns, O_RDONLY | O_CLOEXEC);
 	if (nfd < 0)
-		die("Couldn't open network namespace %s", netns);
+		die("Couldn't open network namespace %s: %s", netns, strerror(errno));
 
 	c->pasta_netns_fd = nfd;
 
 	NS_CALL(ns_check, c);
 
 	if (c->pasta_netns_fd < 0)
-		die("Couldn't switch to pasta namespaces");
+		die("Couldn't switch to pasta namespaces: %s", strerror(errno));
 
 	if (!c->no_netns_quit) {
 		char buf[PATH_MAX] = { 0 };
@@ -261,7 +261,7 @@ void pasta_start_ns(struct ctx *c, uid_t uid, gid_t gid,
 
 	NS_CALL(pasta_wait_for_ns, c);
 	if (c->pasta_netns_fd < 0)
-		die("Failed to join network namespace");
+		die("Failed to join network namespace: %s", strerror(errno));
 }
 
 /**
-- 
2.41.0