* Ugly hack: for CIFS mounts, retry the mount a few times (just as in

pkgs/build-support/vm).  This should make the NixOS regression tests
  more robust on heavily loaded systems, where they now frequently
  fail:

  server# mounting //10.0.2.4/qemu on /hostfs...
  server# [    8.233991] Slow work thread pool: Starting up
  server# [    8.234721] Slow work thread pool: Ready
  server# [   23.271708]  CIFS VFS: No response for cmd 114 mid 1
  server# [   23.272443]  CIFS VFS: cifs_mount failed w/return code = -112
  server# mount: Host is down
  server# [   23.275188] Kernel panic - not syncing: Attempted to kill init!

  Maybe there is a configurable timeout somewhere, which would be much
  nicer...

svn path=/nixos/trunk/; revision=19248

modules/system/boot/stage-1-init.sh

@@ -200,8 +200,17 @@ mountFS() {
     checkFS "$device"
 
     mkdir -p "/mnt-root$mountPoint" || true
-    
-    mount -t "$fsType" -o "$options" "$device" /mnt-root$mountPoint || fail
+
+    # For CIFS mounts, retry a few times before giving up.
+    local n=0
+    while true; do
+        if mount -t "$fsType" -o "$options" "$device" /mnt-root$mountPoint; then
+            break
+        fi
+        if [ "$fsType" != cifs -o "$n" -ge 10 ]; then fail; break; fi
+        echo "retrying..."
+        n=$((n + 1))
+    done
 }