From 6531ce3b5249be34c30cdf6b6ee7dec49aa20d9c Mon Sep 17 00:00:00 2001
From: Albert Cheng <acheng@hdfgroup.org>
Date: Fri, 8 Mar 2002 18:36:59 -0500
Subject: [svn-r5055] Purpose:     New feature Description:     "snapshot diff"
 will just run the diff and exit 0 is no significant     differences found
 between current and previous versions.     Runtest will try a "snapshot diff"
 and will skip test if no significant     differences are found. Platforms
 tested:     eirene

---
 bin/runtest  | 13 +++++++++++++
 bin/snapshot | 19 +++++++++++++++++--
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/bin/runtest b/bin/runtest
index 3447b10..d4aca93 100755
--- a/bin/runtest
+++ b/bin/runtest
@@ -31,6 +31,7 @@ H5VER=			# default to current CVS version
 H5VERSION=		# default to current CVS version
 
 # Default to do checkout (only once) and test, no release.
+# Will run test only if there is significant differences from previous version.
 # If srcdir is not used, don't launched multiple tests
 SNAPSHOT="${DEBUGMODE:+echo }bin/snapshot"
 SRCDIR="srcdir"
@@ -518,6 +519,7 @@ PASSEDLOG=${SNAPYARD}/log/PASSED_LOG_${TODAY}
 FAILEDLOG=${SNAPYARD}/log/FAILED_LOG_${TODAY}
 CVSLOG=${SNAPYARD}/log/CVS_LOG_${TODAY}
 CVSLOG_LOCK=${SNAPYARD}/log/CVS_LOG_LOCK_${TODAY}
+DIFFLOG=${SNAPYARD}/log/DIFF_LOG_${TODAY}
 # Snap Test Configuration file
 SNAPTESTCFG=${SNAPYARD}/snaptest.cfg
 
@@ -595,6 +597,17 @@ else
     fi
 fi
 
+# run a snapshot diff to see if any significant differences between
+# the current and previous versions
+($SNAPSHOT diff ) >> $DIFFLOG 2>&1
+errcode=$?
+if [ $errcode -eq 0 ]; then
+    # no need to run test
+    PRINT "NO TEST: no significant differences between current and previous versions" |
+        tee -a $PASSEDLOG
+    exit 0
+fi
+
 # we can use the version of script in SNAPYARD/current now
 PROGNAME="$SNAPYARD/current/$PROGNAME"
 
diff --git a/bin/snapshot b/bin/snapshot
index a0b5fff..91a863f 100755
--- a/bin/snapshot
+++ b/bin/snapshot
@@ -52,6 +52,10 @@ while [ $# -gt 0 ] ; do
 	    cmdcheckout="checkout"
 	    cmd=""
 	    ;;
+	diff)
+	    cmddiff="diff"
+	    cmd=""
+	    ;;
 	test)
 	    cmdtest="test"
 	    cmd=""
@@ -134,6 +138,8 @@ Usage: $0 [all] [checkout] [test] [srcdir] [release] [help]
     all:      Run all commands (checkout, test & release)
               [Default is all]
     checkout: Run cvs checkout
+    diff:     Run diff on current and previous versions.  Exit 0 if
+              no significant differences are found.  Otherwise, non-zero.
     test:     Run test
     release:  Run release
     clean:    Run make clean
@@ -223,7 +229,7 @@ fi # Do CVS checkout
 #=============================
 # Run Test the HDF5 library
 #=============================
-if [ "$cmd" = "all" -o -n "$cmdtest" ]; then
+if [ "$cmd" = "all" -o -n "$cmdtest" -o -n "$cmddiff" ]; then
     # setup if srcdir is used.
     if [ -z "$srcdir" ]; then
 	TESTDIR=${CURRENT}
@@ -264,13 +270,22 @@ if [ "$cmd" = "all" -o -n "$cmdtest" ]; then
 		    :	#continue
 		else
 		    snapshot=yes
-		    # Don't break because we want to see all the diffs.
 		    break
 		fi
 	    done
 	fi
     fi
 
+    # if diff is choosen, exit 0 if no significant differences are found.
+    # otherwise, exit 1.  This includes cases of other failures.
+    if [ -n "$cmddiff" ]; then
+	if [ $snapshot = no ]; then
+	    exit 0
+	else
+	    exit 1
+	fi
+    fi
+
     # Build, run tests and install procedures
     if [ "$snapshot" = "yes" ]; then
 	if (cd ${TESTDIR} && \
-- 
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