[PATCH v2] conf: No routable interface for IPv4 or IPv6 is informational, not a warning

[Stefano Brivio <sbrivio@redhat.com>]

...Podman users might get confused by the fact that if we can't
find a default route for a given IP version, we'll report that as a
warning message and possibly just before actual error messages.

However, a lack of routable interface for IPv4 or IPv6 can be a
normal circumstance: don't warn about it, just state that as
informational message, if those are displayed (they're not in
non-error paths in Podman, for example).

While at it, make it clear that we're disabling IPv4 or IPv6 if
there's no routable interface for the corresponding IP version.

Reported-by: Paul Holzinger <pholzing@redhat.com>
Link: https://github.com/containers/podman/pull/21563#issuecomment-1937024642
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
---
v2: Report that we're disabling IPv4 or IPv6 in the message

 conf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/conf.c b/conf.c
index 5e15b66..3646700 100644
--- a/conf.c
+++ b/conf.c
@@ -579,7 +579,7 @@ static unsigned int conf_ip4(unsigned int ifi,
 		ifi = nl_get_ext_if(nl_sock, AF_INET);
 
 	if (!ifi) {
-		warn("No external routable interface for IPv4");
+		info("No routable interface for IPv4: IPv4 is disabled");
 		return 0;
 	}
 
@@ -651,7 +651,7 @@ static unsigned int conf_ip6(unsigned int ifi,
 		ifi = nl_get_ext_if(nl_sock, AF_INET6);
 
 	if (!ifi) {
-		warn("No external routable interface for IPv6");
+		info("No routable interface for IPv6: IPv6 is disabled");
 		return 0;
 	}
 
-- 
@@ -579,7 +579,7 @@ static unsigned int conf_ip4(unsigned int ifi,
 		ifi = nl_get_ext_if(nl_sock, AF_INET);
 
 	if (!ifi) {
-		warn("No external routable interface for IPv4");
+		info("No routable interface for IPv4: IPv4 is disabled");
 		return 0;
 	}
 
@@ -651,7 +651,7 @@ static unsigned int conf_ip6(unsigned int ifi,
 		ifi = nl_get_ext_if(nl_sock, AF_INET6);
 
 	if (!ifi) {
-		warn("No external routable interface for IPv6");
+		info("No routable interface for IPv6: IPv6 is disabled");
 		return 0;
 	}
 
-- 
2.39.2