lxc-attach gives a better error message

Don't assume the user knows the kernel internals :) Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>

lxc-attach gives a better error message
9f53d717 · Daniel Lezcano · Daniel Lezcano · b09ecaf3 · 9f53d717
Commit 9f53d717 authored Feb 01, 2011 by Daniel Lezcano Committed by Daniel Lezcano Feb 01, 2011
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namespace.c src/lxc/namespace.c +6 -0

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--- a/src/lxc/namespace.c
+++ b/src/lxc/namespace.c
@@ -102,6 +102,12 @@ int lxc_attach(pid_t pid)
 	int fd[size];
 	int i;
+	sprintf(path, "/proc/%d/ns", pid);
+	if (access(path, R_OK)) {
+		ERROR("Does this kernel version support 'attach' ?");
+		return -1;
+	}
 	for (i = 0; i < size; i++) {
 		sprintf(path, "/proc/%d/ns/%s", pid, ns[i]);
 		fd[i] = open(path, O_RDONLY);