[Xen-devel] [PATCH v3 3/4] tools: use pidfile for test if xenstored is running

[Juergen Gross <jgross@xxxxxxxx>]

Instead of trying to read xenstore via xenstore-read use the pidfile
of xenstored for the test whether xenstored is running. This prepares
support of xenstore domain, as trying to read xenstore will block
for ever in case xenstore domain is started after trying to read.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 tools/hotplug/Linux/init.d/xencommons.in |  2 +-
 tools/hotplug/Linux/launch-xenstore.in   | 58 +++++++++++++++++++-------------
 2 files changed, 35 insertions(+), 25 deletions(-)

diff --git a/tools/hotplug/Linux/init.d/xencommons.in 
b/tools/hotplug/Linux/init.d/xencommons.in
index a32608c..a6a40d6 100644
--- a/tools/hotplug/Linux/init.d/xencommons.in
+++ b/tools/hotplug/Linux/init.d/xencommons.in
@@ -96,7 +96,7 @@ case "$1" in
        do_start
        ;;
   status)
-        ${bindir}/xenstore-read -s /
+        test -f @XEN_RUN_DIR@/xenstored.pid
        ;;
   stop)
        do_stop
diff --git a/tools/hotplug/Linux/launch-xenstore.in 
b/tools/hotplug/Linux/launch-xenstore.in
index a0cbfd3..2bd9f64 100644
--- a/tools/hotplug/Linux/launch-xenstore.in
+++ b/tools/hotplug/Linux/launch-xenstore.in
@@ -18,38 +18,48 @@
 XENSTORED=@XENSTORED@
 
 . @XEN_SCRIPT_DIR@/hotplugpath.sh
-test -f @CONFIG_DIR@/@CONFIG_LEAF_DIR@/xencommons && . 
@CONFIG_DIR@/@CONFIG_LEAF_DIR@/xencommons
 
-time=0
-timeout=30
+test_xenstore () {
+       test -f /var/run/xenstored.pid
+       return $?
+}
 
-if ! `${bindir}/xenstore-read -s / >/dev/null 2>&1`
-then
-       test -z "$XENSTORED_ROOTDIR" && XENSTORED_ROOTDIR="@XEN_LIB_STORED@"
-       rm -f "$XENSTORED_ROOTDIR"/tdb* 2>/dev/null
-       test -z "$XENSTORED_TRACE" || XENSTORED_ARGS=" -T 
@XEN_LOG_DIR@/xenstored-trace.log"
+timeout_xenstore () {
+       local time=0
+       local timeout=30
 
-       if [ -n "$XENSTORED" ] ; then
-           echo -n Starting $XENSTORED...
-           $XENSTORED --pid-file @XEN_RUN_DIR@/xenstored.pid $XENSTORED_ARGS
-       else
-           echo "No xenstored found"
-           exit 1
-       fi
-
-       # Wait for xenstored to actually come up, timing out after 30 seconds
-       while [ $time -lt $timeout ] && ! `${bindir}/xenstore-read -s / 
>/dev/null 2>&1` ; do
-           echo -n .
-           time=$(($time+1))
-           sleep 1
+       while [ $time -lt $timeout ] && ! test_xenstore ; do
+               echo -n .
+               time=$(($time+1))
+               sleep 1
        done
        echo
-
+ 
        # Exit if we timed out
        if ! [ $time -lt $timeout ] ; then
-           echo Could not start xenstored
-           exit 1
+               echo "Could not start $@"
+               return 1
        fi
+
+       return 0
+}
+
+test_xenstore && exit 0
+
+test -f @CONFIG_DIR@/@CONFIG_LEAF_DIR@/xencommons && . 
@CONFIG_DIR@/@CONFIG_LEAF_DIR@/xencommons
+
+test -z "$XENSTORED_ROOTDIR" && XENSTORED_ROOTDIR="@XEN_LIB_STORED@"
+rm -f "$XENSTORED_ROOTDIR"/tdb* 2>/dev/null
+test -z "$XENSTORED_TRACE" || XENSTORED_ARGS=" -T 
@XEN_LOG_DIR@/xenstored-trace.log"
+
+if [ -n "$XENSTORED" ] ; then
+       echo -n Starting $XENSTORED...
+       $XENSTORED --pid-file @XEN_RUN_DIR@/xenstored.pid $XENSTORED_ARGS
+else
+       echo "No xenstored found"
+       exit 1
 fi
 
+timeout_xenstore $XENSTORED || exit 1
+
 exit 0
-- 
2.6.6


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