overlayfs: Allow not used mount points

When machine configuration defines a mount point, which is not used in
any recipe, allow to fall through and only report a note in the logs.
This can be expected behavior, when a mount point is defined for several
machines, but not used in all of them

(From OE-Core rev: 89d83920dc7f80abb20fadde97b47aba9cd992cc)

Signed-off-by: Vyacheslav Yurkov <Vyacheslav.Yurkov@bruker.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
(cherry picked from commit a9c604b5e0d943b5b5f7c8bdd5be730c2abcf866)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
(cherry picked from commit c7c6b273656a3e2b8b959004b996e56d4086ce5e)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/meta/classes/overlayfs.bbclass b/meta/classes/overlayfs.bbclass
index f7069edd41..c3564b6ec1 100644
--- a/meta/classes/overlayfs.bbclass
+++ b/meta/classes/overlayfs.bbclass
@@ -96,7 +96,11 @@ python do_create_overlayfs_units() {
     overlayMountPoints = d.getVarFlags("OVERLAYFS_MOUNT_POINT")
     for mountPoint in overlayMountPoints:
         bb.debug(1, "Process variable flag %s" % mountPoint)
-        for lower in d.getVarFlag('OVERLAYFS_WRITABLE_PATHS', mountPoint).split():
+        lowerList = d.getVarFlag('OVERLAYFS_WRITABLE_PATHS', mountPoint)
+        if not lowerList:
+            bb.note("No mount points defined for %s flag, skipping" % (mountPoint))
+            continue
+        for lower in lowerList.split():
             bb.debug(1, "Prepare mount unit for %s with data mount point %s" %
                      (lower, d.getVarFlag('OVERLAYFS_MOUNT_POINT', mountPoint)))
             prepareUnits(d.getVarFlag('OVERLAYFS_MOUNT_POINT', mountPoint), lower)