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#!/bin/sh
set -e
# editing nsswitch.conf seems to be ok
# http://lists.debian.org/debian-devel/2007/02/msg00076.html
# check to see if name is configured to do lookups through
# LDAP and enable if not
# Note: this function is in both libnss-ldapd.postinst and libpam-ldapd.postinst
nss_enable()
{
name="$1"
if ! grep -q '^'$name':.*ldap.*' /etc/nsswitch.conf
then
echo "/etc/nsswitch.conf: enable LDAP lookups for $name" >&2
if grep -q '^'$name':' /etc/nsswitch.conf
then
# modify an existing entry by just adding ldap to the end
sed -i 's/^\('$name':.*[^[:space:]]\)[[:space:]]*$/\1 ldap/' /etc/nsswitch.conf
else
# append a new line
printf '%-15s ldap\n' $name':' >> /etc/nsswitch.conf
fi
# invalidate nscd cache
nscd -i "$name" > /dev/null 2>&1 || true
fi
# we're done
return 0
}
# remove NSS lookups though LDAP for the specified service
# Note: this function is in both libnss-ldapd.postinst and libnss-ldapd.postrm
nss_disable()
{
name="$1"
# these functions also remove the lookup result handling part
# of the ldap entry (see nsswitch.conf(5))
if grep -q '^'$name':.*ldap.*' /etc/nsswitch.conf
then
echo "/etc/nsswitch.conf: disable LDAP lookups for $name" >&2
if [ -n "`sed -n '/^'$name':[[:space:]]*ldap[[:space:]]*\(\[[^]]*\]\)*[[:space:]]*$/p' /etc/nsswitch.conf`" ]
then
# the name service only maps to ldap, remove the whole line
sed -i '/^'$name':[[:space:]]*ldap[[:space:]]*\(\[[^]]*\]\)*[[:space:]]*$/d' /etc/nsswitch.conf
else
# remove ldap part from existing line, keeping other methods intact
# TODO: remove trailing space
sed -i 's/^\('$name':.*\)ldap[[:space:]]*\(\[[^]]*\]\)*[[:space:]]*\(.*\)$/\1\3/' /etc/nsswitch.conf
fi
# invalidate nscd cache
nscd -i "$name" > /dev/null 2>&1 || true
fi
# we're done
return 0
}
# real functions begin here
if [ "$1" = "configure" ]
then
# get configuration data from debconf
. /usr/share/debconf/confmodule
# modify /etc/nsswitch.conf
db_get libnss-ldapd/nsswitch
enablenss=`echo "$RET" | sed 's/,//g'`
for n in aliases ethers group hosts netgroup networks passwd protocols rpc services shadow
do
if echo ' '$enablenss' ' | grep -q ' '$n' '
then
nss_enable $n
else
nss_disable $n
fi
done
# we're done
db_stop
# update the cache of the dynamic linker
# (we don't use dh_makeshlibs because that also installs a shlibs file
# which we don't need)
ldconfig
fi
#DEBHELPER#
exit 0
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