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#!/bin/sh
set -e
log() {
echo "libnss-mdns.postrm: $*"
}
remove_mdns() {
log "Checking NSS setup..."
# abort if /etc/nsswitch.conf does not exist
if ! [ -e /etc/nsswitch.conf ]; then
log "Could not find /etc/nsswitch.conf."
return
fi
log "Removing mdns from NSS setup"
perl -i -pe '
my @remove=(
"mdns4_minimal [NOTFOUND=return]",
"mdns4_minimal",
"mdns4",
"mdns6_minimal [NOTFOUND=return]",
"mdns6_minimal",
"mdns6",
"mdns_minimal [NOTFOUND=return]",
"mdns_minimal",
"mdns",
);
sub remove {
my $s=shift;
foreach my $bit (@remove) {
$s=~s/\s+\Q$bit\E//g;
}
return $s;
}
s/^(hosts:)(.*)/$1.remove($2)/e;
' /etc/nsswitch.conf
}
action="$1"
if [ "$action" = purge ]; then
# as recommended by
# <https://lists.debian.org/debian-devel/2013/04/msg00656.html>
instances="$(dpkg-query -f '${db:Status-Abbrev} ${binary:Package}\n' -W libnss-mdns | grep -v '^.n' | wc -l)"
if [ "$instances" = 1 ]; then
remove_mdns
else
log "Not removing mdns from nsswitch.conf, $(( $instances - 1 )) architecture(s) still installed"
fi
fi