[svn-r1929] Added the srcdir option to support concurrent tests by different

hosts.  Below is the help output for srcdir.
    srcdir:   Use srcdir option (does not imply other commands)"
		 "snapshot srcdir" is equivalent to "snapshot srcdir all"
		 "snapshot srcdir checkout" is equivalent to "snapshot checkout"

Also used shell variables to hold directory paths for easier maintenance.

bin/snapshot

@@ -38,6 +38,7 @@ fi
 #
 # Command options
 cmd="all"
+test_opt=""
 errcode=0
 echo '$#=' $# '$*="' $* '"'
 while [ $# -gt 0 ] ; do
@@ -53,6 +54,10 @@ while [ $# -gt 0 ] ; do
 	    cmdtest="test"
 	    cmd=""
 	    ;;
+	srcdir)
+	    #use srcdir option for test
+	    srcdir="yes"
+	    ;;
 	release)
 	    cmdrel="release"
 	    cmd=""
@@ -93,12 +98,15 @@ done
 
 if [ "$cmd" = help ]; then
     set -
-    echo "Usage: $0 [all] [checkout] [test] [release] [help] [hdf4 <hdf4lib_path>] [archive <arch_path> ]"
+    echo "Usage: $0 [all] [checkout] [test] [srcdir] [release] [help] [hdf4 <hdf4lib_path>] [archive <arch_path> ]"
     echo "    all:      Run all commands (checkout, test & release)"
     echo "              [Default is all]"
     echo "    checkout: Run cvs checkout"
     echo "    test:     Run test"
     echo "    release:  Run release"
+    echo "    srcdir:   Use srcdir option (does not imply other commands)"
+    echo '                "snapshot srcdir" is equivalent to "snapshot srcdir all"'
+    echo '                "snapshot srcdir checkout" is equivalent to "snapshot checkout"'
     echo "    help:     Print this message"
     echo "    hdf4 <hdf4lib_path>:"
     echo "              Use <hdf4lib_path> as the HDF4LIB locations"
@@ -118,6 +126,8 @@ CONFIGURE="./configure $HDF4LIB"
 snapshot=yes
 
 COMPARE=${HOME}/hdf5-snapshots
+CURRENT=${COMPARE}/current
+PREVIOUS=${COMPARE}/previous
 
 #=============================
 # Run CVS checkout
@@ -129,7 +139,7 @@ if [ "$cmd" = "all" -o -n "$cmdcheckout" ]; then
     test -d ${COMPARE} || mkdir -p ${COMPARE} || exit 1
 
     # Check out the current version from CVS
-    cvs -Q co -d ${COMPARE}/current hdf5 || exit 1
+    cvs -Q co -d ${CURRENT} hdf5 || exit 1
 fi # Do CVS checkout
 
 
@@ -137,9 +147,17 @@ fi # Do CVS checkout
 # Run Test the HDF5 library
 #=============================
 if [ "$cmd" = "all" -o -n "$cmdtest" ]; then
+    # setup if srcdir is used.
+    if [ -z "$srcdir" ]; then
+	TESTDIR=${CURRENT}
+    else
+	#create TESTDIR if not exist yet
+	TESTDIR=${COMPARE}/TestDir/`hostname`
+	test -d ${TESTDIR} || mkdir ${TESTDIR}
+    fi
     # Make sure current version exists and is clean
-    if [ -d ${COMPARE}/current ]; then
-	(cd ${COMPARE}/current && ${MAKE} distclean)
+    if [ -d ${TESTDIR} ]; then
+	(cd ${TESTDIR} && ${MAKE} distclean)
     else
 	errcode=$?
         snapshot=no
@@ -148,13 +166,13 @@ 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 ${COMPARE}/previous ]; then
-	if (diff -c ${COMPARE}/previous/MANIFEST ${COMPARE}/current/MANIFEST); then
+    if [ -d ${PREVIOUS} ]; then
+	if (diff -c ${PREVIOUS}/MANIFEST ${CURRENT}/MANIFEST); then
 	    snapshot=no
-	    for src in `grep '^\.' ${COMPARE}/current/MANIFEST|expand|cut -f1 -d' '`; do
+	    for src in `grep '^\.' ${CURRENT}/MANIFEST|expand|cut -f1 -d' '`; do
 		diff -I H5_VERS_RELEASE -I " released on " \
 		    -I " currently under development" \
-		    ${COMPARE}/previous/$src ${COMPARE}/current/$src || \
+		    ${PREVIOUS}/$src ${CURRENT}/$src || \
 		    snapshot=yes
 		    # Don't break because we want to see all the diffs.
 	    done
@@ -163,8 +181,8 @@ if [ "$cmd" = "all" -o -n "$cmdtest" ]; then
 
     # Make sure all the serial tests work.
     if [ "$snapshot" = "yes" ]; then
-	if (cd ${COMPARE}/current; \
-	    ${CONFIGURE}; \
+	if (cd ${TESTDIR}; \
+	    ${srcdir:+${CURRENT}/}${CONFIGURE}; \
 	    ${MAKE} check); then
 	    :
 	else
@@ -181,12 +199,12 @@ fi # Test the HDF5 library
 #=============================
 if [ "$cmd" = "all" -o -n "$cmdrel" ]; then
     if [ "$snapshot" = "yes" ]; then
-	(cd ${COMPARE}/current; ${MAKE} distclean)
+	(cd ${CURRENT}; ${MAKE} distclean)
 	(
 	    # Turn on exit on error in the sub-shell so that it does not
 	    # cvs commit if errors encounter here.
 	    set -e
-	    cd ${COMPARE}/current
+	    cd ${CURRENT}
 	    bin/release -d $ARCHIVES $METHODS
 	    RELEASE_VERSION="`perl bin/h5vers -v`"
 	    perl bin/h5vers -i
@@ -196,8 +214,8 @@ if [ "$cmd" = "all" -o -n "$cmdrel" ]; then
     fi
 
     # Replace the previous version with the current version.
-    rm -rf ${COMPARE}/previous
-    mv ${COMPARE}/current ${COMPARE}/previous
+    rm -rf ${PREVIOUS}
+    mv ${CURRENT} ${PREVIOUS}
 fi #Release snapshot
 
 exit $errcode