From d4c6268b826be3722835d49be9fd904a2a765edb Mon Sep 17 00:00:00 2001
From: Albert Cheng <acheng@hdfgroup.org>
Date: Sat, 1 Jul 2000 19:10:50 -0500
Subject: [svn-r2424] snapshot needs a version of diff that supports the -I
 (ignore pattern) option.  A system may have several versions of diff (e.g.,
 vendor's and Gnu's).  Added codes to try them all until finding one that
 supports it.  If found, use it; else stick with plain "diff" and may waste
 time when there are no differences besides the ignorable patterns.

Platforms tested:
Solaris 2.7, Redhat 6.2
---
 bin/snapshot | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/bin/snapshot b/bin/snapshot
index c4aad35..c5ec605 100755
--- a/bin/snapshot
+++ b/bin/snapshot
@@ -169,6 +169,13 @@ BASEDIR=${HOME}/snapshots-${H5VERSION}
 CURRENT=${BASEDIR}/current
 PREVIOUS=${BASEDIR}/previous
 
+# Try finding a version of diff that supports the -I option too.
+DIFF=diff
+for d in `echo $PATH | sed -e 's/:/ /g'` ; do
+    test -x $d/diff && $d/diff -I XYZ /dev/null /dev/null > /dev/null 2>&1 &&
+	DIFF=$d/diff && break
+done
+
 #=============================
 # Run CVS checkout
 #=============================
@@ -215,10 +222,10 @@ if [ "$cmd" = "all" -o -n "$cmdtest" ]; then
     # Compare it with the previous version.  Compare only files listed in
     # the MANIFEST plus the MANIFEST itself.
     if [ -d ${PREVIOUS} ]; then
-	if (diff -c ${PREVIOUS}/MANIFEST ${CURRENT}/MANIFEST); then
+	if (${DIFF} -c ${PREVIOUS}/MANIFEST ${CURRENT}/MANIFEST); then
 	    snapshot=no
 	    for src in `grep '^\.' ${CURRENT}/MANIFEST|expand|cut -f1 -d' '`; do
-		diff -I H5_VERS_RELEASE -I " released on " \
+		${DIFF} -I H5_VERS_RELEASE -I " released on " \
 		    -I " currently under development" \
 		    ${PREVIOUS}/$src ${CURRENT}/$src || \
 		    snapshot=yes
-- 
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