Author: trasz
Date: Sat Nov 4 14:38:00 2017
New Revision: 325392
URL: https://svnweb.freebsd.org/changeset/base/325392
Log:
Add NIS automounter map, which supports rewriting of self-hosted locations
to make them nullfs.
PR: 221010
Submitted by: G. Paul Ziemba
MFC after: 2 weeks
Added:
head/etc/autofs/include_nis (contents, props changed)
Modified:
head/etc/autofs/Makefile
Modified: head/etc/autofs/Makefile
==============================================================================
--- head/etc/autofs/Makefile Sat Nov 4 14:35:01 2017 (r325391)
+++ head/etc/autofs/Makefile Sat Nov 4 14:38:00 2017 (r325392)
@@ -1,6 +1,6 @@
# $FreeBSD$
-FILES= include_ldap special_hosts special_media special_noauto
special_null
+FILES= include_ldap include_nis special_hosts special_media
special_noauto special_null
NO_OBJ=
FILESDIR= /etc/autofs
Added: head/etc/autofs/include_nis
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/etc/autofs/include_nis Sat Nov 4 14:38:00 2017 (r325392)
@@ -0,0 +1,180 @@
+#!/usr/bin/awk -f
+#-
+# Copyright (c) 2017 G. Paul Ziemba
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+#
+
+#
+# /etc/autofs/include_nis
+#
+# automountd Directory Services script for NIS
+#
+# SYNOPSIS
+# include_nis <mapname>
+#
+# include_nis <mapname> <key>
+#
+# DESCRIPTION
+#
+# This script provides a Directory Services map for automountd
+# based on NIS. Please see auto_master(5) for general information.
+#
+# The first form, with one argument, emits the entire named NIS map.
+# The second form, with two arguments, emits the map entry for the
+# key given in the second argument.
+#
+# This script attempts to determine the names and IP addresses
+# of the local host. Map entries matching the local host are
+# rewritten to specify nullfs mounts (instead of the default
+# NFS) to reduce access overhead in the kernel.
+#
+# If a map entry contains multiple location fields, it is not changed.
+#
+
+
+# Populate list of names and IP addrs thet mean "this host"
+# into myhostnames array
+BEGIN {
+ #
+ # Set self hostnames
+ #
+
+ "hostname -s" | getline;
+ myhostnames[$0] = 1;
+
+ "hostname -f" | getline;
+ myhostnames[$0] = 1;
+
+ myhostnames["localhost"] = 1
+
+ "hostname -f" | getline;
+ localdomain=$0
+ myhostnames["localhost."localdomain] = 1
+
+ while ("ifconfig" | getline) {
+ if ($1 == "inet") {
+ myhostnames[$2] = 1;
+ }
+ }
+
+ # debug
+# print "--- hostname list start ----"
+# for (i in myhostnames) {
+# print i
+# }
+# print "--- hostname list end ----"
+
+ if (ARGC == 2) {
+ # mapname only
+ while ("ypcat -k " ARGV[1] | getline) {
+ proc_mapline(1)
+ }
+ }
+ if (ARGC == 3) {
+ # mapname and keyname
+ while ("ypmatch " ARGV[2] " " ARGV[1] | getline) {
+ proc_mapline(0)
+ }
+ }
+ exit 0
+}
+
+function is_self(hostname)
+{
+ if (myhostnames[hostname]) {
+ return 1
+ }
+ return 0
+}
+
+#
+# Lines are of the form [key] [-opts] location1 [... locationN]
+#
+# indicate index of key field with first positional parameter
+# 1 means keyfield is the first field
+# 0 means keyfield is not present
+#
+function proc_mapline(keyfield)
+{
+ optionsfield = 0
+ locationfield = 0
+ locationcount = 0
+
+ for (i=keyfield+1; i <= NF; ++i) {
+ if (!optionsfield) {
+ if ($i ~ /^-/) {
+ # the first options field found on the line
+ optionsfield = i;
+ continue
+ }
+ }
+ # Assumption: location contains colon (":")
+ if (optionsfield && ($i ~ /:/) && ($i !~ /^-/)) {
+ ++locationcount
+ if (!locationfield) {
+ # the first location field found on the line
+ locationfield = i
+ }
+ }
+ }
+
+ #
+ # If location not found, do not modify.
+ #
+ # If there is more than one location, do not modify. Rationale:
+ # Options are applied to all locations. We ca not have "nullfs"
+ # for only some locations and "nfs" for others for a given
+ # map key (i.e., a line). The usual reason for multiple
+ # locations is for redundancy using replicated volumes on
+ # multiple hosts, so multiple hosts imply fstype=nfs (the
+ # FreeBSD default for automounter maps).
+ #
+ # Hypothetically there could be a map entry with multiple
+ # locations all with host parts matching "me". In that case,
+ # it would be safe to rewrite the locations and specify
+ # nullfs, but the code does not handle this case.
+ #
+ if (locationcount == 1) {
+ #
+ # We have a line with exactly one location field
+ #
+ # Assumption: location has no more than one colon (":")
+ #
+ n=split($locationfield,location,":")
+ if (is_self(location[1])) {
+ $locationfield = ":" location[2]
+ if (optionsfield) {
+ # append to existing options
+ $optionsfield = $optionsfield ",fstype=nullfs"
+ } else {
+ # sneak in ahead of location
+ $locationfield = "-fstype=nullfs " $locationfield
+ }
+ }
+ }
+
+ print
+}
_______________________________________________
svn-src-all@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-all
To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
