[OE-core] [PATCH 3/4] core-image.bbclass: support read-only-rootfs image feature

[Qi.Chen at windriver.com]

From: Chen Qi <Qi.Chen at windriver.com>

Two hook functions are appended to ROOTFS_POSTPROCESS_COMMAND
properly to support the 'read-only-rootfs' image feature.

[YOCTO #3406]

Signed-off-by: Chen Qi <Qi.Chen at windriver.com>
---
 meta/classes/core-image.bbclass |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/meta/classes/core-image.bbclass b/meta/classes/core-image.bbclass
index 2e67018..dc8fdc3 100644
--- a/meta/classes/core-image.bbclass
+++ b/meta/classes/core-image.bbclass
@@ -28,6 +28,7 @@ LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=3f40d7994397109285ec7b81fdeb3
 # - dev-pkgs            - development packages (headers, etc.) for all installed packages in the rootfs
 # - dbg-pkgs            - debug symbol packages for all installed packages in the rootfs
 # - doc-pkgs            - documentation packages for all installed packages in the rootfs
+# - read-only-rootfs    - tweaks an image to support read-only rootfs
 #
 PACKAGE_GROUP_x11 = "packagegroup-core-x11"
 PACKAGE_GROUP_x11-base = "packagegroup-core-x11-base"
@@ -73,9 +74,11 @@ inherit image
 
 # Create /etc/timestamp during image construction to give a reasonably sane default time setting
 ROOTFS_POSTPROCESS_COMMAND += "rootfs_update_timestamp ; "
-
+# Choose the correct configuartion files for volatile storage handling
+ROOTFS_POSTPROCESS_COMMAND += "choose_volatile_conf_file ; "
 # Zap the root password if debug-tweaks feature is not enabled
 ROOTFS_POSTPROCESS_COMMAND += '${@base_contains("IMAGE_FEATURES", "debug-tweaks", "", "zap_root_password ; ",d)}'
 # Allow openssh accept empty password login if both debug-tweaks and ssh-server-openssh are enabled
 ROOTFS_POSTPROCESS_COMMAND += '${@base_contains("IMAGE_FEATURES", "debug-tweaks ssh-server-openssh", "openssh_allow_empty_password; ", "",d)}'
-
+# Tweak the mount options for rootfs in /etc/fstab if read-only-rootfs is enabled
+ROOTFS_POSTPROCESS_COMMAND += '${@base_contains("IMAGE_FEATURES", "read-only-rootfs", "read_only_rootfs_hook; ", "",d)}'
-- 
1.7.9.5