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post_install() {
# try to insert the unknown entry to the "passwd" and "group" lines in
# /etc/nsswitch.conf to automatically enable libnss-unknown support; do not
# change the configuration if the lines already contain "unknown"
echo "Checking NSS setup..."
# abort if /etc/nsswitch.conf does not exist
if ! [ -e /etc/nsswitch.conf ]; then
echo "Could not find /etc/nsswitch.conf."
return
fi
perl -i -pe '
sub insert {
my $line = shift;
# this also splits on tab
my @bits=split(" ", $line);
# do not break configuration if the line already references
# unknown
if (grep { $_ eq "unknown"} @bits) {
return $line;
}
# add unknown at the end
return $line . " unknown";
}
s/^(passwd:\s+)(.*)/$1.insert($2)/e;
s/^(group:\s+)(.*)/$1.insert($2)/e;
' /etc/nsswitch.conf
}
post_remove() {
# try to remove the unknown entry from the "passwd" and "group" lines in
# /etc/nsswitch.conf to disable libnss-unknown support
echo "Checking NSS setup..."
# abort if /etc/nsswitch.conf does not exist
if ! [ -e /etc/nsswitch.conf ]; then
echo "Could not find /etc/nsswitch.conf."
return
fi
# we must remove possible [foo=bar] options as well
sed -i -r "/(passwd|group):/ s/[[:space:]]+unknown\b([[:space:]]*\[[^]]*\])*//" \
/etc/nsswitch.conf
}
# vim:set sw=2 et:
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