postfix: less overlayfs rewrites

Signed-off-by: Denis Shulyaka <Shulyaka@gmail.com>

mail/postfix/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=postfix
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 PKG_SOURCE_URL:=ftp://ftp.porcupine.org/mirrors/postfix-release/official/
 PKG_VERSION:=3.2.2
 PKG_HASH:=d06849418d119d09366997b2b481bb23f737629769b4e4a52da42fb3ad8b0576

mail/postfix/patches/900_less_overlayfs_rewrites.patch

@@ -0,0 +1,24 @@
+diff -Naur a/conf/post-install b/conf/post-install
+--- a/conf/post-install	2015-12-28 00:00:45.000000000 +0000
++++ b/conf/post-install	2017-08-01 22:42:30.476896711 +0000
+@@ -561,15 +561,16 @@
+ 	    then
+ 		set_permission=1
+ 	    fi
++	    test -n "$recursive" && nonrecursive="" || nonrecursive="-maxdepth 0"
+ 	    test -n "$set_permission" && {
+-		chown $recursive $owner $path || exit 1
+-		test -z "$group" || chgrp $recursive $group $path || exit 1
++		find $path $nonrecursive ! -user $owner -exec chown $owner "{}" ";" || exit 1
++		test -z "$group" || find $path $nonrecursive ! -group $group -exec chgrp $group "{}" ";" || exit 1
+ 		# Don't "chmod -R"; queue file status is encoded in mode bits.
+ 		if [ "$type" = "d" -a -n "$recursive" ]
+ 		then
+-		    find $path -type d -exec chmod $mode "{}" ";"
++		    find $path -type d -a ! -perm $mode -exec chmod $mode "{}" ";"
+ 		else
+-		    chmod $mode $path
++		    find $path $nonrecursive ! -perm $mode -exec chmod $mode "{}" ";"
+ 		fi || exit 1
+ 	    }
+ 	done