libnss-mdns: fix postinst and postrm

Don't blindly add mdns_minimal, instead check for existing
mdns_minimal instances. Fixes continuously appending mdns settings
to nssswitch.conf when upgrading.

(From OE-Core rev: 9da097b0de6425464ebd3f0539b7495b11d139b5)

Signed-off-by: Dan McGregor <dan.mcgregor@usask.ca>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 9 insertions, 6 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 8d2feec769..5be5e4fa32 100644
--- a/meta/recipes-connectivity/libnss-mdns/libnss-mdns_0.10.bb
+++ b/meta/recipes-connectivity/libnss-mdns/libnss-mdns_0.10.bb
@@ -28,13 +28,16 @@ DEBIANNAME_${PN} = "libnss-mdns"
 RDEPENDS_${PN} = "avahi-daemon"
 
 pkg_postinst_${PN} () {
-        sed -e '/^hosts:/s/\s*\<mdns\>//' \
-                -e 's/\(^hosts:.*\)\(\<files\>\)\(.*\)\(\<dns\>\)\(.*\)/\1\2 mdns4_minimal [NOTFOUND=return]\3\4 mdns\5/' \
-                -i $D${sysconfdir}/nsswitch.conf
+        sed '
+                /^hosts:/ !b
+                /\<mdns\(4\|6\)\?\(_minimal\)\?\>/ b
+                s/\([[:blank:]]\+\)dns\>/\1mdns4_minimal [NOTFOUND=return] dns/g
+                ' -i $D${sysconfdir}/nsswitch.conf
 }
 
 pkg_prerm_${PN} () {
-        sed -e '/^hosts:/s/\s*\<mdns\>//' \
-                -e '/^hosts:/s/\s*mdns4_minimal\s\+\[NOTFOUND=return\]//' \
-                -i $D${sysconfdir}/nsswitch.conf
+        sed '
+                /^hosts:/ !b
+                s/[[:blank:]]\+mdns\(4\|6\)\?\(_minimal\( \[NOTFOUND=return\]\)\?\)\?//g
+                ' -i $D${sysconfdir}/nsswitch.conf
 }