Make test for gnuplot work with empty strings.

When I launch fio_generate_plots on a system where gnuplot is not installed I
get this error :

$ fio_generate_plots test
Making bw logs
/usr/bin/fio_generate_plots: 42: /usr/bin/fio_generate_plots: -: not found

That's because the test checking whether gnuplot is installed is failing
because of an empty variable :
GNUPLOT=$(which gnuplot)
if [ ! -x $GNUPLOT ]; then
        echo You need gnuplot installed to generate graphs
        exit 1
fi

Indeed the command "test -x" is exiting with code 0.

To correct this we should enclose the variable with quotes :
if [ ! -x "$GNUPLOT" ]; then

Then the script is going into the test properly :
$ fio_generate_plots test
You need gnuplot installed to generate graphs

I copied problem description by Hervé from the Debian bug report below.

Fixes:
Bug#700580: /usr/bin/fio_generate_plots: -: not found
http://bugs.debian.org/700580

Reported-By: Hervé Werner <hwerner@score-md.com>
Tested-By: Hervé Werner <hwerner@score-md.com>
Tested-By: Martin Steigerwald <ms@teamix.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fio_generate_plots b/fio_generate_plots
index 4285415eac2879da04850369a6aab7a067c5518f..5e2febdac4810b93ad36dfb10774e78b7f886642 100755 (executable)
--- a/fio_generate_plots
+++ b/fio_generate_plots
@@ -8,7 +8,7 @@ if [ "$1"x = "x" ]; then
 fi
 
 GNUPLOT=$(which gnuplot)
-if [ ! -x $GNUPLOT ]; then
+if [ ! -x "$GNUPLOT" ]; then
        echo You need gnuplot installed to generate graphs
        exit 1
 fi