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package/unscd: new package

PATCH New Doug Kehn 3 participants 6 messages Dec 2, 2015 – Dec 23, 2015

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Doug Kehn

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#0 lore raw

PATCH v7 1/1 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 <[email protected]>
Cc Arnout Vandecappelle <[email protected]>
Cc Thomas Petazzoni <[email protected]>
Signed-off-by Doug Kehn <[email protected]>

---
Changes v6 -> v7
- Re-add package/Config.in (Arnout).
- Reword config help test (Arnout).
- Remove commented params in nscd.conf (Arnout).
- Rework BUILD_CMDS (Arnout/Thomas).
- Reword commit log (Arnout).
Changes v5 -> v6
- Remove toolchain patch/BR2_GLIBC_NSCD (Thomas).
- Change source site from Debian to upstream (Thomas).
- Update to version 0.52 (Thomas).
Changes v4 -> v5
- Reincorporate $(APPLY_PATCHES) suggestion after update by Arnout.
Changes v3 -> v4
- Incorporate feedback/suggestions by Yann and Maxime.
Changes v2 -> v3
- Remove trailing '/' from UNSCD_SITE.
- Whitespace cleanup.
Changes v1 -> v2
- Incorporate feedback/suggestions by Yann (from nss-pam-ldapd patch).

---
 package/Config.in        |  1 +
 package/unscd/Config.in  | 25 +++++++++++++++++++++++++
 package/unscd/S46unscd   | 24 ++++++++++++++++++++++++
 package/unscd/nscd.conf  | 33 +++++++++++++++++++++++++++++++++
 package/unscd/unscd.hash |  2 ++
 package/unscd/unscd.mk   | 36 ++++++++++++++++++++++++++++++++++++
 6 files changed, 121 insertions(+)
 create mode 100644 package/unscd/Config.in
 create mode 100644 package/unscd/S46unscd
 create mode 100644 package/unscd/nscd.conf
 create mode 100644 package/unscd/unscd.hash
 create mode 100644 package/unscd/unscd.mk
package/Config.in +1 -0
index 2bdad01..e56a318 100644
@@ -1542,6 +1542,7 @@ 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 new file +25 -0
new file mode 100644
index 0000000..e979c30
@@ -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 new file +24 -0
new file mode 100644
index 0000000..7d18f94
@@ -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: $0 {start|stop|restart|reload}"
+        exit 1
+esac
package/unscd/nscd.conf new file +33 -0
new file mode 100644
index 0000000..3eb08ab
@@ -0,0 +1,33 @@
+# /etc/nscd.conf
+#
+# An example Name Service Cache config file.  This file is needed by nscd.
+#
+server-user unscd
+debug-level 0
+
+enable-cache            passwd  yes
+positive-time-to-live   passwd  600
+negative-time-to-live   passwd  20
+suggested-size          passwd  1001
+check-files             passwd  yes
+
+enable-cache            group   yes
+positive-time-to-live   group   3600
+negative-time-to-live   group   60
+suggested-size          group   1001
+check-files             group   yes
+
+# hosts caching is broken with gethostby* calls, hence is now disabled
+# by default. Specifically, the caching does not obey DNS TTLs, and
+# thus could lead to problems if the positive-time-to-live is
+# significantly larger than the actual TTL.
+#
+# You should really use a caching nameserver instead of nscd for this
+# sort of request. However, you can easily re-enable this by default.
+enable-cache            hosts   no
+positive-time-to-live   hosts   3600
+negative-time-to-live   hosts   20
+suggested-size          hosts   1001
+check-files             hosts   yes
+
+# unscd does not support services caching
package/unscd/unscd.hash new file +2 -0
new file mode 100644
index 0000000..ab8ffdc
@@ -0,0 +1,2 @@
+# Locally computed:
+sha256	4c1f83dcd120469fceef749050cb29fa666fa4666bd308dfe92e933a4c200d55	nscd-0.52.c
package/unscd/unscd.mk new file +36 -0
new file mode 100644
index 0000000..54caeb1
@@ -0,0 +1,36 @@
+################################################################################
+#
+# unscd
+#
+################################################################################
+
+UNSCD_VERSION = 0.52
+UNSCD_SOURCE = nscd-$(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))
Signature · 1 line
2.6.2
#1 lore raw

PATCH v7 1/1 package/unscd: new package

Quoted 8 lines · Doug Kehn

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.

Quoted 6 lines

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

Cc Yann E. MORIN <[email protected]>
Cc Arnout Vandecappelle <[email protected]>
Cc Thomas Petazzoni <[email protected]>
Signed-off-by Doug Kehn <[email protected]>
Reviewed-by Arnout Vandecappelle (Essensium/Mind) <[email protected]>

Regards,
Arnout

[snip]

Signature · 6 lines
Arnout Vandecappelle                          arnout at mind be
Senior Embedded Software Architect            +32-16-286500
Essensium/Mind                                http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium           BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
GPG fingerprint:  7493 020B C7E3 8618 8DEC 222C 82EB F404 F9AC 0DDF
#2 lore raw

PATCH v7 1/1 package/unscd: new package

In reply to Doug Kehn

Dear Doug Kehn,

Quoted 34 lines · Doug Kehn

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 <[email protected]>
Cc Arnout Vandecappelle <[email protected]>
Cc Thomas Petazzoni <[email protected]>
Signed-off-by Doug Kehn <[email protected]>

---
Changes v6 -> v7
- Re-add package/Config.in (Arnout).
- Reword config help test (Arnout).
- Remove commented params in nscd.conf (Arnout).
- Rework BUILD_CMDS (Arnout/Thomas).
- Reword commit log (Arnout).
Changes v5 -> v6
- Remove toolchain patch/BR2_GLIBC_NSCD (Thomas).
- Change source site from Debian to upstream (Thomas).
- Update to version 0.52 (Thomas).
Changes v4 -> v5
- Reincorporate $(APPLY_PATCHES) suggestion after update by Arnout.
Changes v3 -> v4
- Incorporate feedback/suggestions by Yann and Maxime.
Changes v2 -> v3
- Remove trailing '/' from UNSCD_SITE.
- Whitespace cleanup.
Changes v1 -> v2
- Incorporate feedback/suggestions by Yann (from nss-pam-ldapd patch).

Quoted 13 lines
---
 package/Config.in        |  1 +
 package/unscd/Config.in  | 25 +++++++++++++++++++++++++
 package/unscd/S46unscd   | 24 ++++++++++++++++++++++++
 package/unscd/nscd.conf  | 33 +++++++++++++++++++++++++++++++++
 package/unscd/unscd.hash |  2 ++
 package/unscd/unscd.mk   | 36 ++++++++++++++++++++++++++++++++++++
 6 files changed, 121 insertions(+)
 create mode 100644 package/unscd/Config.in
 create mode 100644 package/unscd/S46unscd
 create mode 100644 package/unscd/nscd.conf
 create mode 100644 package/unscd/unscd.hash
 create mode 100644 package/unscd/unscd.mk

I've applied your patch. However, I think a follow-up patch would be good to add the use of a PID file in the init script. See for example S50dropbear for an example where a PID file is used.

Thanks!

Thomas

Signature · 3 lines
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
author
#3 lore raw

PATCH v7 1/1 package/unscd: new package

Hi Thomas,

Quoted 51 lines · Thomas Petazzoni

Dear Doug Kehn,

Quoted 34 lines · Doug Kehn

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 <[email protected]>
Cc Arnout Vandecappelle <[email protected]>
Cc Thomas Petazzoni <[email protected]>
Signed-off-by Doug Kehn <[email protected]>

---
Changes v6 -> v7
- Re-add package/Config.in (Arnout).
- Reword config help test (Arnout).
- Remove commented params in nscd.conf (Arnout).
- Rework BUILD_CMDS (Arnout/Thomas).
- Reword commit log (Arnout).
Changes v5 -> v6
- Remove toolchain patch/BR2_GLIBC_NSCD (Thomas).
- Change source site from Debian to upstream (Thomas).
- Update to version 0.52 (Thomas).
Changes v4 -> v5
- Reincorporate $(APPLY_PATCHES) suggestion after update by Arnout.
Changes v3 -> v4
- Incorporate feedback/suggestions by Yann and Maxime.
Changes v2 -> v3
- Remove trailing '/' from UNSCD_SITE.
- Whitespace cleanup.
Changes v1 -> v2
- Incorporate feedback/suggestions by Yann (from nss-pam-ldapd patch).

Quoted 13 lines
---
 package/Config.in        |  1 +
 package/unscd/Config.in  | 25 +++++++++++++++++++++++++
 package/unscd/S46unscd   | 24 ++++++++++++++++++++++++
 package/unscd/nscd.conf  | 33 +++++++++++++++++++++++++++++++++
 package/unscd/unscd.hash |  2 ++
 package/unscd/unscd.mk   | 36 ++++++++++++++++++++++++++++++++++++
 6 files changed, 121 insertions(+)
 create mode 100644 package/unscd/Config.in
 create mode 100644 package/unscd/S46unscd
 create mode 100644 package/unscd/nscd.conf
 create mode 100644 package/unscd/unscd.hash
 create mode 100644 package/unscd/unscd.mk
Quoted 4 lines

I've applied your patch. However, I think a follow-up patch would be good to add the use of a PID file in the init script. See for example S50dropbear for an example where a PID file is used.

A PID file is created by unscd in /var/run/nscd/ when it is started. The PID file is deleted when unscd is stopped; however, the /var/run/nscd/ directory remains.

unscd can be started in debug mode (a.k.a foreground, -d option). In doing so, PID file creation could be done in the init script as requested. The problem I see here is that unscd logs to stderr when started in debug mode.

Do you still prefer a patch for PID file creation in the init script?

Thanks,
...doug

#4 lore raw

PATCH v7 1/1 package/unscd: new package

Hello,

Quoted 11 lines · rdkehn at yahoo.com

A PID file is created by unscd in /var/run/nscd/ when it is started. The PID file is deleted when unscd is stopped; however, the /var/run/nscd/ directory remains.

unscd can be started in debug mode (a.k.a foreground, -d option). In doing so, PID file creation could be done in the init script as requested. The problem I see here is that unscd logs to stderr when started in debug mode.

Do you still prefer a patch for PID file creation in the init script?

You can tell start-stop-daemon that the PID file is created by the daemon itself. Basically, pass just the -p <pid-file> option when starting and stopping the daemon. As long as you don't pass -m when starting the daemon, start-stop-daemon does not create the pid file.

See man start-stop-daemon(8) for all the details.

Best regards,

Thomas

Signature · 3 lines
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
author
#5 lore raw

PATCH v7 1/1 package/unscd: new package

Hi Thomas,

Quoted 16 lines · Thomas Petazzoni

Hello,

Quoted 11 lines · rdkehn at yahoo.com

A PID file is created by unscd in /var/run/nscd/ when it is started. The PID file is deleted when unscd is stopped; however, the /var/run/nscd/ directory remains.

unscd can be started in debug mode (a.k.a foreground, -d option). In doing so, PID file creation could be done in the init script as requested. The problem I see here is that unscd logs to stderr when started in debug mode.

Do you still prefer a patch for PID file creation in the init script?

Quoted 7 lines

You can tell start-stop-daemon that the PID file is created by the daemon itself. Basically, pass just the -p <pid-file> option when starting and stopping the daemon. As long as you don't pass -m when starting the daemon, start-stop-daemon does not create the pid file.

See man start-stop-daemon(8) for all the details.

Ah, you're not saying that you want stat-stop-daemon to create the PID file. (It's early, coffee starting to kick in...)

Regards,
...doug