From 1cb70fff353b3ebda22c3d9df44b89cc1a5384e6 Mon Sep 17 00:00:00 2001
From: wangchao <wangchao>
Date: Fri, 30 Jan 2004 02:10:53 +0000
Subject: [PATCH] b=1171 r=shaver

rewrite new_uuid function for lmc
---
 lustre/tests/conf-sanity.sh | 50 +++++++++++++++++++++++++++++++++++++++++++++
 lustre/utils/lmc            | 29 +++++++++++++-------------
 2 files changed, 64 insertions(+), 15 deletions(-)

diff --git a/lustre/tests/conf-sanity.sh b/lustre/tests/conf-sanity.sh
index 6c3978e..ea57441 100644
--- a/lustre/tests/conf-sanity.sh
+++ b/lustre/tests/conf-sanity.sh
@@ -385,4 +385,54 @@ test_12() {
 }
 run_test 12 "lmc --batch, with single/double quote, backslash in batchfile"
 
+test_13() {
+        OLDXMLCONFIG=$XMLCONFIG
+        XMLCONFIG="conf13-1.xml"
+        SECONDXMLCONFIG="conf13-2.xml"
+
+        # check long uuid will be truncated properly and uniquely
+        echo "To generate XML configuration file(with long ost name): $XMLCONFIG"
+        [ -f "$XMLCONFIG" ] && rm -f $XMLCONFIG
+        do_lmc --add net --node localhost --nid localhost.localdomain --nettype tcp
+        do_lmc --add mds --node localhost --mds mds1_name_longer_than_31characters
+        do_lmc --add mds --node localhost --mds mds2_name_longer_than_31characters
+        if [ ! -f "$XMLCONFIG" ]; then
+                echo "Error:no file $XMLCONFIG created!"
+                return 1
+        fi
+        EXPECTEDMDS1UUID="e_longer_than_31characters_UUID"
+        EXPECTEDMDS2UUID="longer_than_31characters_UUID_2"
+        FOUNDMDS1UUID=`awk -F"'" '/<mds uuid=/{print $2}' $XMLCONFIG | sed -n '1p'`
+        FOUNDMDS2UUID=`awk -F"'" '/<mds uuid=/{print $2}' $XMLCONFIG | sed -n '2p'`
+        if [ $EXPECTEDMDS1UUID != $FOUNDMDS1UUID ]; then
+                echo "Error:expected uuid for mds1: $EXPECTEDMDS1UUID; found: $FOUNDMDS1UUID"
+                return 1
+        fi
+        if [ $EXPECTEDMDS2UUID != $FOUNDMDS2UUID ]; then
+                echo "Error:expected uuid for mds2: $EXPECTEDMDS2UUID; found: $FOUNDMDS2UUID"
+                return 1
+        fi
+        echo "Success:long uuid truncated successfully and being unique."
+
+        # check multiple invocations for lmc generate same XML configuration file
+        rm -f $XMLCONFIG
+        echo "Generate the first XML configuration file"
+        gen_config
+        echo "mv $XMLCONFIG to $SECONDXMLCONFIG"
+        mv $XMLCONFIG $SECONDXMLCONFIG || return $?
+        echo "Generate the second XML configuration file"
+        gen_config
+        if [ `diff $XMLCONFIG $SECONDXMLCONFIG | wc -l` -eq 0 ]; then
+                echo "Success:multiple invocations for lmc generate same XML file"
+        else
+                echo "Error: multiple invocations for lmc generate different XML file"
+                return 1
+        fi
+
+        rm -f $XMLCONFIG
+        rm -f $SECONDXMLCONFIG
+        XMLCONFIG=$OLDXMLCONFIG
+}
+run_test 13 "check new_uuid of lmc operating correctly"
+
 equals_msg "Done"
diff --git a/lustre/utils/lmc b/lustre/utils/lmc
index 79ed60f..f8dabf4 100755
--- a/lustre/utils/lmc
+++ b/lustre/utils/lmc
@@ -25,7 +25,7 @@ lmc - lustre configuration data manager
 
 """
 
-import sys, os, getopt, string, exceptions, random, re
+import sys, os, getopt, string, exceptions, re
 import xml.dom.minidom
 from xml.dom.ext import PrettyPrint
 
@@ -46,6 +46,7 @@ DEFAULT_PORT = 988
 DEFAULT_STRIPE_SZ = 65536
 DEFAULT_STRIPE_CNT = 1
 DEFAULT_STRIPE_PATTERN = 0
+UUID_MAX_LENGTH = 31
 
 def reference():
     print """usage: lmc --add object [object parameters]
@@ -226,11 +227,18 @@ def new_name(base):
     return ret
 
 def new_uuid(name):
-    ret_uuid = '%05x_%.19s_%05x%05x' % (int(random.random() * 1048576),
-                                        name,
-                                        int(random.random() * 1048576),
-                                        int(random.random() * 1048576))
-    return ret_uuid[:36]
+    ctr = 2
+    ret = "%s_UUID" % (name)
+    if len(ret) > UUID_MAX_LENGTH:
+        ret = ret[-UUID_MAX_LENGTH:]
+    while uuids.has_key(ret):
+        ret = "%s_UUID_%d" % (name, ctr)
+        ctr = 1 + ctr
+        if len(ret) > UUID_MAX_LENGTH:
+            ret = ret[-UUID_MAX_LENGTH:]
+    uuids[ret] = 1
+    return ret
+
 
 ldlm_name = 'ldlm'
 ldlm_uuid = 'ldlm_UUID'
@@ -1124,15 +1132,6 @@ def main():
 
     gen = GenConfig(doc)
 
-    # the PRNG is normally seeded with time(), which is not so good for starting    # time-synchronized clusters
-    input = open('/dev/urandom', 'r')
-    if not input:
-        print 'Unable to open /dev/urandom!'
-        sys.exit(1)
-    seed = input.read(32)
-    input.close()
-    random.seed(seed)
-
     if options.batch:
         fp = open(options.batch)
         batchCommands = fp.readlines()
-- 
1.8.3.1