[Xen-devel] [PATCH, 4.0] tools: provide startup script for libxl

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

In Xen 4.0 there is no /etc/init.d/xencommons (and we do not want to
backport the refactoring of /etc/init.d/xend).  This means that in
most situations you don't get xenstored, and xl doesn't work, unless
you do something shonky like starting and then immediately stopping
xend.

To test xl, my automatic testing system therefore provides its own
init script "xenlightdaemons" to start xenstored and xenconsoled.
This script was created by borrowing from /etc/init.d/xend and other
init scripts in various versions of xen.hg.

Here it is (from testing.git 78c59993ab536b8c39c5a00a).  The user
will still have to add appropriate rc links, and only a script for
Linux is provided.

Testing: I have done a build test on patch and the script does end up
in dist/install/etc/init.d/xenlightdaemons; the script itself is
tested as part of my automatic test system.

Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>

diff -r 0b16e1d60871 tools/hotplug/Linux/Makefile
--- a/tools/hotplug/Linux/Makefile      Wed Jan 26 09:05:53 2011 +0000
+++ b/tools/hotplug/Linux/Makefile      Thu Feb 03 11:49:09 2011 +0000
@@ -4,6 +4,7 @@ include $(XEN_ROOT)/tools/Rules.mk
 # Init scripts.
 XEND_INITD = init.d/xend
 XEND_SYSCONFIG = init.d/sysconfig.xend
+XENLIGHTDAEMONS_INITD = init.d/xenlightdaemons
 XENDOMAINS_INITD = init.d/xendomains
 XENDOMAINS_SYSCONFIG = init.d/sysconfig.xendomains
 
@@ -65,6 +66,7 @@ install-initd:
        [ -d $(DESTDIR)$(CONFIG_DIR)/sysconfig ] || $(INSTALL_DIR) 
$(DESTDIR)$(CONFIG_DIR)/sysconfig
        $(INSTALL_PROG) $(XEND_INITD) $(DESTDIR)$(CONFIG_DIR)/init.d
        $(INSTALL_PROG) $(XEND_SYSCONFIG) $(DESTDIR)$(CONFIG_DIR)/sysconfig/xend
+       $(INSTALL_PROG) $(XENLIGHTDAEMONS_INITD) $(DESTDIR)$(CONFIG_DIR)/init.d
        $(INSTALL_PROG) $(XENDOMAINS_INITD) $(DESTDIR)$(CONFIG_DIR)/init.d
        $(INSTALL_PROG) $(XENDOMAINS_SYSCONFIG) 
$(DESTDIR)$(CONFIG_DIR)/sysconfig/xendomains
 
diff -r 0b16e1d60871 tools/hotplug/Linux/init.d/xenlightdaemons
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/hotplug/Linux/init.d/xenlightdaemons        Thu Feb 03 11:49:09 
2011 +0000
@@ -0,0 +1,81 @@
+#!/bin/bash
+#
+# xenlightdaemons      Script to start and stop xenstored and xenconsoled
+#                     FOR USE WITH LIBXL, not xend
+#
+# Author:       Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
+#
+# chkconfig: 2345
+# description: Starts and stops the Xen control daemon.
+### BEGIN INIT INFO
+# Provides:          xenstored xenconsoled
+# Required-Start:    $syslog $remote_fs
+# Should-Start:
+# Required-Stop:     $syslog $remote_fs
+# Should-Stop:
+# Default-Start:     3 4 5
+# Default-Stop:      1
+# Default-Enabled:   yes
+# Short-Description: Start/stop xenstored and xenconsoled
+# Description:       Starts and stops the daemons neeeded for xl/libxenlight
+### END INIT INFO
+
+XENCONSOLED_PIDFILE=/var/run/xenconsoled.pid
+
+shopt -s extglob
+test -f /etc/sysconfig/xend && . /etc/sysconfig/xend
+
+if   test "x$1" = xstart && \
+     test -d /proc/xen && \
+   ! test -d /proc/xen/capabilities && \
+     grep '    xenfs$' /proc/filesystems >/dev/null && \
+   ! grep '^xenfs ' /proc/mounts >/dev/null;
+then
+       mount -t xenfs xenfs /proc/xen
+fi
+
+if ! grep -q "control_d" /proc/xen/capabilities ; then
+       exit 0
+fi
+
+do_start () {
+       test -z "$XENSTORED_ROOTDIR" || export XENSTORED_ROOTDIR
+       [[ "$XENSTORED_TRACE" == @(yes|on|1) ]] && export XENSTORED_TRACE
+       xenstore-read -s / >/dev/null 2>&1 || xenstored
+
+       test -z "$XENCONSOLED_TRACE" || XENCONSOLED_ARGS=" 
--log=$XENCONSOLED_TRACE"
+       xenconsoled --pid-file=$XENCONSOLED_PIDFILE $XENCONSOLED_ARGS 
$XENCONSOLED_OPTIONS
+}
+do_stop () {
+       if read 2>/dev/null <$XENCONSOLED_PIDFILE pid; then
+               kill $pid
+               while kill -9 $pid >/dev/null 2>&1; do sleep 0.1; done
+               rm -f $XENCONSOLED_PIDFILE
+       fi
+}
+
+case "$1" in
+  start)
+       do_start
+       ;;
+  status)
+        xenstore-read -s /
+       ;;
+  stop)
+       do_stop
+       ;;
+  reload)
+       echo >&2 'Reload not available; use force-reload'; exit 1
+       ;;
+  force-reload|restart)
+        do_stop
+       do_start
+       ;;
+  *)
+       # do not advertise unreasonable commands that there is no reason
+       # to use with this device
+       echo $"Usage: $0 {start|stop|status|restart|force-reload}"
+       exit 1
+esac
+
+exit $?

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