postinst is in libnss-ldapd 0.9.9-1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
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set -e
# editing nsswitch.conf seems to be ok
# http://lists.debian.org/debian-devel/2007/02/msg00076.html
# check whether the name is configure to do lookups through
# LDAP
# Note: this function is in libnss-ldapd.postinst and libnss-ldapd.postrm
nss_is_enabled()
{
name="$1"
grep -q '^[[:space:]]*'$name'[[:space:]]*:.*ldap.*' /etc/nsswitch.conf
}
# check to see if name is configured to do lookups through
# LDAP and enable if not
nss_enable()
{
name="$1"
if ! nss_is_enabled "$name"
then
echo "/etc/nsswitch.conf: enable LDAP lookups for $name" >&2
if grep -q '^[[:space:]]*'$name'[[:space:]]*:' /etc/nsswitch.conf
then
# modify an existing entry by just adding ldap to the end
sed -i 's/^\([[:space:]]*'$name'[[:space:]]*:.*[^[:space:]]\)[[: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 libnss-ldapd.postinst and libnss-ldapd.postrm
nss_disable()
{
name="$1"
# these functions also remove the lookup result handling part
# of the ldap entry (see nsswitch.conf(5))
if nss_is_enabled "$name"
then
echo "/etc/nsswitch.conf: disable LDAP lookups for $name" >&2
if [ -n "`sed -n '/^[[:space:]]*'$name'[[:space:]]*:[[:space:]]*ldap[[:space:]]*\(\[[^]]*\]\)*[[:space:]]*$/p' /etc/nsswitch.conf`" ]
then
# the name service only maps to ldap, remove the whole line
sed -i '/^[[:space:]]*'$name'[[:space:]]*:[[: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/^\([[:space:]]*'$name'[[:space:]]*:.*\)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
fi
exit 0
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