nspawn: bind mount /etc/resolv.conf from the host by default

diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index bf3a84471dd833b4b6380c04cbfd8d06c885dd40..83bec96cc5cee11c0e732121342c4ef9c8b4583c 100644 (file)
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -263,6 +263,28 @@ static int setup_timezone(const char *dest) {
         return 0;
 }
 
+static int setup_resolv_conf(const char *dest) {
+        char *where;
+
+        assert(dest);
+
+        if (arg_private_network)
+                return 0;
+
+        /* Fix resolv.conf, if possible */
+        if (asprintf(&where, "%s/etc/resolv.conf", dest) < 0) {
+                log_error("Out of memory");
+                return -ENOMEM;
+        }
+
+        if (mount("/etc/resolv.conf", where, "bind", MS_BIND, NULL) >= 0)
+                mount("/etc/resolv.conf", where, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
+
+        free(where);
+
+        return 0;
+}
+
 static int copy_devnodes(const char *dest) {
 
         static const char devnodes[] =
@@ -966,6 +988,9 @@ int main(int argc, char *argv[]) {
                 if (setup_timezone(arg_directory) < 0)
                         goto child_fail;
 
+                if (setup_resolv_conf(arg_directory) < 0)
+                        goto child_fail;
+
                 if (chdir(arg_directory) < 0) {
                         log_error("chdir(%s) failed: %m", arg_directory);
                         goto child_fail;