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libnss-mdns: avoid race condition in postinst 

Writing to "/tmp/nsswitch.conf" leads to a race condition if two
copies of the postinst are running simultaneously.  Fix this by
modifying /etc/nsswitch.conf in place using sed -i.  Also make the
same change to the prerm for consistency although the race will not
occur here in practice.

(From OE-Core rev: 689884653938b98899fb3ba791221fdbe2f40e7f)

(From OE-Core rev: 2a2741c12196c34c5e6127488a8eeec7118b2952)

Signed-off-by: Phil Blundell <philb@gnu.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Phil Blundell 2011-11-14 13:06:51 +00:00 committed by Richard Purdie
parent 08a834a08a
commit 709ad80662
1 changed files with 3 additions and 5 deletions
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8
meta/recipes-connectivity/libnss-mdns/libnss-mdns_0.10.bb
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@ -7,7 +7,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=2d5025d4aa3495befef8f17206a5b0a1"
DEPENDS = "avahi"
RDEPENDS_${PN} = "avahi-daemon"
PR = "r3"
PR = "r4"
SRC_URI = "http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-${PV}.tar.gz"
@ -26,14 +26,12 @@ 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 && {
cat $D/etc/nsswitch.conf | sed 's/hosts:\s*files dns/& mdns4/' > /tmp/nsswitch.conf
mv /tmp/nsswitch.conf $D/etc/nsswitch.conf
sed -i 's/hosts:\s*files dns/& mdns4/' $D/etc/nsswitch.conf
}
}
pkg_prerm_${PN} () {
cat /etc/nsswitch.conf | grep "hosts:\s*files dns mdns4$" > /dev/null && {
cat /etc/nsswitch.conf | sed 's/\(hosts:\s*files dns\) mdns4*/\1/' > /tmp/nsswitch.conf
mv /tmp/nsswitch.conf /etc/nsswitch.conf
sed -i 's/\(hosts:\s*files dns\) mdns4*/\1/' /etc/nsswitch.conf
}
}