[Buildroot] [PATCH 1/1 v3] package/unscd: new package

[Yann E. MORIN <yann.morin.1998@free.fr>]

Doug, All,

[CCing Maxime, as he knows systemd better than I do]

On 2015-10-09 09:10 -0500, Doug Kehn spake thusly:
> 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.
> 
> Cc: Yann E. MORIN <yann.morin.1998@free.fr>
> Signed-off-by: Doug Kehn <rdkehn@yahoo.com>
[--SNIP--]
> diff --git a/package/unscd/S46unscd b/package/unscd/S46unscd
> new file mode 100644
> index 0000000..387ab32
> --- /dev/null
> +++ b/package/unscd/S46unscd
> @@ -0,0 +1,24 @@
> +#!/bin/sh
> +
> +NAME="nscd"
> +DAEMON="/usr/sbin/${NAME}"
> +
> +case "$1" in
> +start)
> +        echo -n "Starting ${NAME}: "

We have recently readicated use of 'echo -n' and all other non-POSIX use
of echo. Please, use printf instead.

[--SNIP--]
> diff --git a/package/unscd/unscd.mk b/package/unscd/unscd.mk
> new file mode 100644
> index 0000000..e8cccd3
> --- /dev/null
> +++ b/package/unscd/unscd.mk
> @@ -0,0 +1,55 @@
> +################################################################################
> +#
> +# unscd
> +#
> +################################################################################
> +
> +UNSCD_VERSION = 0.51
> +UNSCD_SOURCE = unscd_$(UNSCD_VERSION).orig.tar.gz
> +UNSCD_SITE = http://snapshot.debian.org/archive/debian/20150519T094547Z/pool/main/u/unscd
> +UNSCD_EXTRA_DOWNLOADS = unscd_$(UNSCD_VERSION)-1.debian.tar.gz
> +UNSCD_LICENSE = GPLv2
> +UNSCD_LICENSE_FILES = debian/copyright
> +
> +define UNSCD_EXTRACT_DEBIAN
> +	gzip -d -c $(BR2_DL_DIR)/$(UNSCD_EXTRA_DOWNLOADS) | tar -C $(@D) -xf -

Please use suitable-extractor, like so:

    $(call suitable-extractor,$(UNSCD_EXTRA_DOWNLOADS)) $(DL_DIR)/$(UNSCD_EXTRA_DOWNLOADS) \
    |$(TAR) xf -C $(@D) -

> +endef
> +
> +UNSCD_POST_EXTRACT_HOOKS += UNSCD_EXTRACT_DEBIAN
> +
> +define UNSCD_APPLY_DEBIAN_PATCHES
> +	for f in `grep -Ev "^#" $(@D)/debian/patches/series 2> /dev/null`; do \
> +		cat "$(@D)/debian/patches/$${f}" | patch -g0 -p1 -E -d "$(@D)" -t -N; \

Please use apply-patches, like so:

    $(APPLY_PATCHES) $(@D) $(@D)/debian

> +	done
> +endef
> +
> +UNSCD_POST_PATCH_HOOKS += UNSCD_APPLY_DEBIAN_PATCHES
> +
> +define UNSCD_BUILD_CMDS
> +	$(TARGET_CC) $(TARGET_CFLAGS) $(TARGET_LDFLAGS) \
> +		$(@D)/nscd.c -o $(@D)/nscd
> +endef
> +
> +define UNSCD_INSTALL_TARGET_CMDS
> +	$(INSTALL) -m 755 -D $(@D)/nscd $(TARGET_DIR)/usr/sbin/nscd
> +	$(INSTALL) -m 600 -D $(@D)/debian/nscd.conf $(TARGET_DIR)/etc/nscd.conf
> +endef
> +
> +define UNSCD_INSTALL_INIT_SYSTEMD
> +	$(INSTALL) -m 755 -D package/unscd/unscd.service \
> +		$(TARGET_DIR)/usr/lib/systemd/system/unscd.service
> +	mkdir -p $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants

Not that it matters a lot, but I think using $(INSTALL) to create
directories should be favoured, like so:

    $(INSTALL) -d $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants

> +	ln -fs ../../../../usr/lib/systemd/system/unscd.service \
> +		$(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/unscd.service
> +endef
[--SNIP--]
> diff --git a/package/unscd/unscd.service b/package/unscd/unscd.service
> new file mode 100644
> index 0000000..58dd7eb
> --- /dev/null
> +++ b/package/unscd/unscd.service
> @@ -0,0 +1,11 @@
> +[Unit]
> +Description=Micro Name Service Caching Daemon.
> +After=syslog.target network.target
> +
> +[Service]
> +Type=forking
> +PIDFile=/var/run/nscd/nscd.pid
> +ExecStart=/usr/sbin/nscd
> +
> +[Install]
> +WantedBy=multi-user.target

Maxime, what's your opinion on this systemd unit?

Regards,
Yann E. MORIN.

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