package/unscd: new package

A daemon which handles passwd, group and host lookups for running
programs and caches the results for the next query. This package is
intended to replace glibc nscd. Presently, glibc nscd is not installed
by Buildroot.

unscd depends on glibc because it relies on glibc function
__nss_disable_nscd.

nscd.conf is taken from glibc with unused configurations removed.

Cc: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Doug Kehn <rdkehn@yahoo.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/Config.in

@@ -1579,6 +1579,7 @@ if BR2_PACKAGE_BUSYBOX_SHOW_OTHERS
 	source "package/sysvinit/Config.in"
 	source "package/tar/Config.in"
 endif
+	source "package/unscd/Config.in"
 	source "package/util-linux/Config.in"
 endmenu
 

package/unscd/Config.in

@@ -0,0 +1,25 @@
+config BR2_PACKAGE_UNSCD
+	bool "unscd"
+	depends on BR2_TOOLCHAIN_USES_GLIBC
+	help
+	  Micro Name Service Caching Daemon
+
+	  A daemon which handles passwd, group and host lookups for
+	  running programs and caches the results for the next query.
+	  You only need this package if you are using slow Name Services
+	  like LDAP, NIS or NIS+.
+
+	  This particular NSCD is a complete rewrite of the GNU glibc
+	  nscd which is a single threaded server process which offloads
+	  all NSS lookups to worker children; cache hits are handled by
+	  the parent, and only cache misses start worker children,
+	  making the parent immune to resource leaks, hangs, and crashes
+	  in NSS libraries.
+
+	  It should mostly be a drop-in replacement for existing
+	  installs using nscd.
+
+	  http://busybox.net/~vda/unscd
+
+comment "unscd needs an (e)glibc toolchain"
+	depends on !BR2_TOOLCHAIN_USES_GLIBC

package/unscd/S46unscd

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+NAME="nscd"
+DAEMON="/usr/sbin/${NAME}"
+
+case "$1" in
+start)
+        printf "Starting ${NAME}: "
+        start-stop-daemon -S -x ${DAEMON}
+        [ $? -eq 0 ] && echo "OK" || echo "FAIL"
+        ;;
+stop)
+        printf "Stopping ${NAME}: "
+        start-stop-daemon -K -x ${DAEMON}
+        [ $? -eq 0 ] && echo "OK" || echo "FAIL"
+        ;;
+restart|reload)
+        $0 stop
+        $0 start
+        ;;
+*)
+        echo "Usage: $0 {start|stop|restart|reload}"
+        exit 1
+esac

package/unscd/nscd.conf

@@ -0,0 +1,33 @@
+# /etc/nscd.conf
+#
+# An example Name Service Cache config file.  This file is needed by nscd.
+#
+server-user unscd
+debug-level 0
+
+enable-cache            passwd  yes
+positive-time-to-live   passwd  600
+negative-time-to-live   passwd  20
+suggested-size          passwd  1001
+check-files             passwd  yes
+
+enable-cache            group   yes
+positive-time-to-live   group   3600
+negative-time-to-live   group   60
+suggested-size          group   1001
+check-files             group   yes
+
+# hosts caching is broken with gethostby* calls, hence is now disabled
+# by default. Specifically, the caching does not obey DNS TTLs, and
+# thus could lead to problems if the positive-time-to-live is
+# significantly larger than the actual TTL.
+#
+# You should really use a caching nameserver instead of nscd for this
+# sort of request. However, you can easily re-enable this by default.
+enable-cache            hosts   no
+positive-time-to-live   hosts   3600
+negative-time-to-live   hosts   20
+suggested-size          hosts   1001
+check-files             hosts   yes
+
+# unscd does not support services caching

package/unscd/unscd.hash

@@ -0,0 +1,2 @@
+# Locally computed:
+sha256	4c1f83dcd120469fceef749050cb29fa666fa4666bd308dfe92e933a4c200d55	nscd-0.52.c

package/unscd/unscd.mk

@@ -0,0 +1,36 @@
+################################################################################
+#
+# unscd
+#
+################################################################################
+
+UNSCD_VERSION = 0.52
+UNSCD_SOURCE = nscd-$(UNSCD_VERSION).c
+UNSCD_SITE = http://busybox.net/~vda/unscd
+UNSCD_LICENSE = GPLv2
+UNSCD_LICENSE_FILES = $(UNSCD_SOURCE)
+
+define UNSCD_EXTRACT_CMDS
+	cp $(DL_DIR)/$($(PKG)_SOURCE) $(@D)/
+endef
+
+define UNSCD_BUILD_CMDS
+	cd $(@D); \
+	$(TARGET_CC) $(TARGET_CFLAGS) $(TARGET_LDFLAGS) -o nscd $(UNSCD_SOURCE)
+endef
+
+define UNSCD_INSTALL_TARGET_CMDS
+	$(INSTALL) -m 755 -D $(@D)/nscd $(TARGET_DIR)/usr/sbin/nscd
+	$(INSTALL) -m 600 -D package/unscd/nscd.conf $(TARGET_DIR)/etc/nscd.conf
+endef
+
+define UNSCD_INSTALL_INIT_SYSV
+	$(INSTALL) -m 755 -D package/unscd/S46unscd \
+		$(TARGET_DIR)/etc/init.d/S46unscd
+endef
+
+define UNSCD_USERS
+	unscd -1 unscd -1 * - - - unscd user
+endef
+
+$(eval $(generic-package))