From: Andre Noll <maan@tuebingen.mpg.de>
Date: Sat, 14 Feb 2015 20:17:53 +0000 (+0100)
Subject: common: Fix gsu_is_a_number().
X-Git-Url: http://git.tuebingen.mpg.de/?p=gsu.git;a=commitdiff_plain;h=5829a1d41d45ea6a8ce04292c8f4c9487a4414a4

common: Fix gsu_is_a_number().

We must use [ ... ] in gsu_is_a_number() because arithmetic expansion
with ((...))  undergoes parameter and variable expansion. For example

	x=foo
	gsu_is_a_number "$x"

will pass "foo" to gsu_is_a_number() where the expression  (("$1"))
tries to expand the (non-existing) variable foo, aborting the script
if set -u was given.

This bug was introduced a few month ago in commit 44860e92 (Use modern
style arithmetic evaluation everwhere).
---

diff --git a/common b/common
index fe64cd6..e326890 100644
--- a/common
+++ b/common
@@ -39,7 +39,7 @@ EOF
 gsu_is_a_number()
 {
 	result="$1"
-	if (("$1" == "$1")) &> /dev/null; then
+	if [ "$1" -eq "$1" ] &> /dev/null; then
 		ret=$GSU_SUCCESS
 	else
 		ret=-$E_GSU_NOT_A_NUMBER