[PATCH v1 1/1] check-non-portable-shell.pl: Quoted `wc -l` is not portable

From: tboegi@web.de <tboegi@web.de>
Date: Dec 10, 2017, 10:50 UTC
Message-ID: <20171210105013.3984-1-tboegi@web.de>
In-Reply-To: <xmqqh8t2ckgw.fsf@gitster.mtv.corp.google.com>

From: Torsten Bögershausen <tboegi@web.de>

wc -l is used to count the number if lines in test scripts.
$ wc -l Makefile
gives a line like this:
105 Makefile
while Mac OS has 4 leading spaces:
     105 Makefile

And this means that shell expressions like test "$(wc -l <expect)" = "4" don't work under Mac OS,

A portable way to use `wc -l` is to omit the '"': test $(wc -l <expect) = "4"

Add a check in check-non-portable-shell.pl to find '"' between `wc -l` and '='

Signed-off-by: Torsten Bögershausen <tboegi@web.de>
---
 t/check-non-portable-shell.pl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/t/check-non-portable-shell.pl b/t/check-non-portable-shell.pl
index 03dc9d2852..9ebf65c26f 100755
--- a/t/check-non-portable-shell.pl
+++ b/t/check-non-portable-shell.pl
@@ -21,6 +21,7 @@ while (<>) {
 	/^\s*declare\s+/ and err 'arrays/declare not portable';
 	/^\s*[^#]\s*which\s/ and err 'which is not portable (please use type)';
 	/\btest\s+[^=]*==/ and err '"test a == b" is not portable (please use =)';
+	/\bwc -l.*"\s*=/ and err '`"$(wc -l)"` is not portable, please use `$(wc -l)`';
 	/\bexport\s+[A-Za-z0-9_]*=/ and err '"export FOO=bar" is not portable (please use FOO=bar && export FOO)';
 	# this resets our $. for each file
 	close ARGV if eof;

-- 
2.15.1.271.g1a4e40aa5d