[OE-core] [PATCH 05/12] volatiles.bbclass: add recipe

[Qi.Chen at windriver.com]

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

All recipes that need to tweak their directories need to inherit this
class and set VOLATILE_DIR, VOLATILE_LINK and VOLATILE_PKGS.

[YOCTO #3406]

Signed-off-by: Chen Qi <Qi.Chen at windriver.com>
---
 meta/classes/volatiles.bbclass |   11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 meta/classes/volatiles.bbclass

diff --git a/meta/classes/volatiles.bbclass b/meta/classes/volatiles.bbclass
new file mode 100644
index 0000000..f27e598
--- /dev/null
+++ b/meta/classes/volatiles.bbclass
@@ -0,0 +1,11 @@
+# This bbclass is for read-only-rootfs support. All recipes that may tweak their
+# own directories in order to run correctly in a read-only rootfs enviroment
+# should inherit this class and set VOLATILE_DIR, VOLATILE_LINK, VOLATILE_PKGS.
+
+# For each package, the net result is a read-only specific conf file generated
+# and packaged, which has the name of readonly-${VOLATILESPN}.
+
+# All these config files are then parsed by populate-volatile.sh to create proper
+# directories and links.
+
+inherit ${@base_contains('DISTRO_FEATURES','sysvinit','volatiles_sysvinit','',d)}
-- 
1.7.9.5