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>
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@ -7,7 +7,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=2d5025d4aa3495befef8f17206a5b0a1"
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DEPENDS = "avahi"
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RDEPENDS_${PN} = "avahi-daemon"
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PR = "r3"
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PR = "r4"
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SRC_URI = "http://0pointer.de/lennart/projects/nss-mdns/nss-mdns-${PV}.tar.gz"
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@ -26,14 +26,12 @@ EXTRA_OECONF = "--libdir=${base_libdir} --disable-lynx --enable-avahi"
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# TODO: pattern based configuration update
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pkg_postinst_${PN} () {
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cat $D/etc/nsswitch.conf | grep "hosts:\s*files dns$" > /dev/null && {
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cat $D/etc/nsswitch.conf | sed 's/hosts:\s*files dns/& mdns4/' > /tmp/nsswitch.conf
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mv /tmp/nsswitch.conf $D/etc/nsswitch.conf
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sed -i 's/hosts:\s*files dns/& mdns4/' $D/etc/nsswitch.conf
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}
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}
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pkg_prerm_${PN} () {
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cat /etc/nsswitch.conf | grep "hosts:\s*files dns mdns4$" > /dev/null && {
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cat /etc/nsswitch.conf | sed 's/\(hosts:\s*files dns\) mdns4*/\1/' > /tmp/nsswitch.conf
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mv /tmp/nsswitch.conf /etc/nsswitch.conf
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sed -i 's/\(hosts:\s*files dns\) mdns4*/\1/' /etc/nsswitch.conf
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}
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}
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