[PATCH V3 2/4] dpkg: modify the run-postinst script to enable postinst logging

[<Qi.Chen@windriver.com>]

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

Enable postinst logging by checking the configuration in /etc/
default/postinst.

In this way, the postinst logging is enabled if 'debug-tweaks' is
in IMAGE_FEATURES, and at the same time, we avoid unnecessary rebuilt
if IMAGE_FEATURES is changed.

[YOCTO #4262]

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 meta/recipes-devtools/dpkg/dpkg.inc |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/meta/recipes-devtools/dpkg/dpkg.inc b/meta/recipes-devtools/dpkg/dpkg.inc
index d773fbd..08a9f5a 100644
--- a/meta/recipes-devtools/dpkg/dpkg.inc
+++ b/meta/recipes-devtools/dpkg/dpkg.inc
@@ -35,10 +35,6 @@ do_configure () {
     autotools_do_configure
 }
 
-POSTLOG ?= "/var/log/postinstall.log"
-REDIRECT_CMD = "${@base_contains('IMAGE_FEATURES', 'debug-tweaks', '>${POSTLOG} 2>&1', '', d)}"
-REDIRECT_CMD[vardepsexclude] += "IMAGE_FEATURES POSTLOG"
-
 DPKG_INIT_POSITION ?= "98"
 
 do_install_append () {
@@ -67,7 +63,12 @@ if [ "x$D" != "x" ] && [ -f $D/var/lib/dpkg/status ]; then
 
 	# this happens at S98 where our good 'ole packages script used to run
 	echo "#!/bin/sh
-dpkg --configure -a ${REDIRECT_CMD}
+[ -e /etc/default/postinst ] && . /etc/default/postinst
+if [ \"\$POSTINST_LOGGING\" = \"1\" ]; then
+    dpkg --configure -a >\$LOGFILE 2>&1
+else
+    dpkg --configure -a
+fi
 rm -f ${sysconfdir}/rcS.d/S${DPKG_INIT_POSITION}run-postinsts
 " > $D${sysconfdir}/rcS.d/S${DPKG_INIT_POSITION}run-postinsts
 	chmod 0755 $D${sysconfdir}/rcS.d/S${DPKG_INIT_POSITION}run-postinsts
-- 
1.7.9.5