[PATCH] libnss-mdns: fix postinst scripts

[Andreas Oberritter <obi@opendreambox.org>]

* On upgrade, postinst ocassionally returned 1, so use a
  conditional instead of &&.
* Use sed patterns in order to make it work more generally.

Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
---
 .../libnss-mdns/libnss-mdns_0.10.bb                |   15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/meta/recipes-connectivity/libnss-mdns/libnss-mdns_0.10.bb b/meta/recipes-connectivity/libnss-mdns/libnss-mdns_0.10.bb
index 8770714..a1f2f9a 100644
--- a/meta/recipes-connectivity/libnss-mdns/libnss-mdns_0.10.bb
+++ b/meta/recipes-connectivity/libnss-mdns/libnss-mdns_0.10.bb
@@ -7,7 +7,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=2d5025d4aa3495befef8f17206a5b0a1"
 
 DEPENDS = "avahi"
 RDEPENDS_${PN} = "avahi-daemon"
-PR = "r4"
+PR = "r5"
 
 SRC_URI = "http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-${PV}.tar.gz"
 
@@ -23,15 +23,14 @@ DEBIANNAME_${PN} = "libnss-mdns"
 
 EXTRA_OECONF = "--libdir=${base_libdir} --disable-lynx --enable-avahi"
 
-# TODO: pattern based configuration update
 pkg_postinst_${PN} () {
-	cat $D/etc/nsswitch.conf | grep "hosts:\s*files dns$" > /dev/null && {
-		sed -i 's/hosts:\s*files dns/& mdns4/' $D/etc/nsswitch.conf
-	}
+if ! grep -q '^hosts:.*\<mdns4\>' $D/etc/nsswitch.conf; then
+	sed -e 's/^hosts:.*/& mdns4/' -i $D/etc/nsswitch.conf
+fi
 }
 
 pkg_prerm_${PN} () {
-	cat /etc/nsswitch.conf | grep "hosts:\s*files dns mdns4$" > /dev/null && {
-		sed -i 's/\(hosts:\s*files dns\) mdns4*/\1/' /etc/nsswitch.conf
-	}
+if grep -q '^hosts:.*\<mdns4\>' /etc/nsswitch.conf; then
+	sed -e '/^hosts:/s/\s\<mdns4\>//' -i /etc/nsswitch.conf
+fi
 }
-- 
1.7.9.5