[OE-core] [PATCH V3 1/4] bitbake.conf: add VOLATILE_LOG_DIR variable

[Chen Qi]

The default value is "yes" which results in the /var/log being a link
pointing to /var/volatile/log which is on tmpfs.

Setting valid boolean false value ('no', 'n', 'false', 'f', '0') would make
/var/log to be a directory on persistent storage.

[YOCTO #6132]

Signed-off-by: Chen Qi <Qi.Chen at windriver.com>
---
 meta/conf/bitbake.conf | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/meta/conf/bitbake.conf b/meta/conf/bitbake.conf
index 1472e8f..0e40c30 100644
--- a/meta/conf/bitbake.conf
+++ b/meta/conf/bitbake.conf
@@ -83,6 +83,10 @@ USRBINPATH_class-nativesdk = "/usr/bin"
 # Root home directory
 ROOT_HOME ??= "/home/root"
 
+# If set to boolean true ('yes', 'y', 'true', 't', '1'), /var/log links to /var/volatile/log.
+# If set to boolean false ('no', 'n', 'false', 'f', '0'), /var/log is on persistent storage.
+VOLATILE_LOG_DIR ?= "yes"
+
 ##################################################################
 # Architecture-dependent build variables.
 ##################################################################
-- 
1.9.1