network: Add error message if iw couldn't be found

When iw is not installed on the host, lxc fails to move wireless devices into a container. Unfortunately there is no real error message yet (other than that it didn't work), so its quite unobvious what causes this. This commit adds a error message that clearly states the application iw is missing. Signed-off-by: Maximilian Blenk <blenkmax@gmail.com>

network: Add error message if iw couldn't be found
06151d4a · Max · Christian Brauner · 41e9f73c · 06151d4a
Unverified Commit 06151d4a authored Feb 06, 2021 by Max Committed by Christian Brauner Feb 26, 2021
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network.c src/lxc/network.c +3 -1

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--- a/src/lxc/network.c
+++ b/src/lxc/network.c
@@ -1237,8 +1237,10 @@ int lxc_netdev_move_wlan(char *physname, const char *ifname, pid_t pid,
 	 * the 80211 module, so for now just call out to iw.
 	 */
 	cmd = on_path("iw", NULL);
-	if (!cmd)
+	if (!cmd) {
+		ERROR("Couldn't find the application iw in PATH");
 		return -1;
+	}

 	fpid = fork();
 	if (fpid < 0)