Subject: Re: [PATCH v2] Get rid of the non portable shell export VAR=VALUE costruct

From: Torsten Bögershausen <[email-masked]>
Date: Fri, 23 May 2014 22:40:41 +0200

On 2014-05-23 20.44, Jonathan Nieder wrote:
> Junio C Hamano wrote:
>> Elia Pinto <[email-masked]> writes:
> 
>>> Found by check-non-portable-shell.pl
>>
>> Thanks.
>>
>> Makes me wonder why these two were missed, though.
> 
> Good catch.  check-non-portable-shell.pl uses an anchored regex:
> 
> 	/^\s*export\s+[^=]*=/
> 
> Perhaps something like
> 
> 	/\bexport\s+[A-Za-z0-9_]*=/
> 
> without anchoring would work better.
> 
> -- >8 --
> Subject: test-lint: find unportable sed, echo, test, and export usage after &&
> 
> Instead of anchoring these checks with "^\s*", just check that the
> usage is preceded by a word boundary.  So now we can catch
> 
> 	test $cond && export foo=bar
Thanks for digging.

I wonder if we could keep the anchoring (to reduce false positives)
and try to catch a line "command1 && command2" at the same time:

diff --git a/t/check-non-portable-shell.pl b/t/check-non-portable-shell.pl
index 45971f4..f64e054 100755
--- a/t/check-non-portable-shell.pl
+++ b/t/check-non-portable-shell.pl
@@ -16,12 +16,12 @@ sub err {
 
 while (<>) {
        chomp;
-       /^\s*sed\s+-i/ and err 'sed -i is not portable';
-       /^\s*echo\s+-n/ and err 'echo -n is not portable (please use printf)';
-       /^\s*declare\s+/ and err 'arrays/declare not portable';
-       /^\s*[^#]\s*which\s/ and err 'which is not portable (please use type)';
+       /(^|&&)\s*sed\s+-i/ and err 'sed -i is not portable';
+       /(^|&&)\s*echo\s+-n/ and err 'echo -n is not portable (please use printf)';
+       /(^|&&)\s*declare\s+/ and err 'arrays/declare not portable';
+       /(^|&&)\s*[^#]\s*which\s/ and err 'which is not portable (please use type)';
        /test\s+[^=]*==/ and err '"test a == b" is not portable (please use =)';
-       /^\s*export\s+[^=]*=/ and err '"export FOO=bar" is not portable (please use FOO=bar && export FOO)';
+       /(^|&&)\s*export\s+[^=]*=/ and err '"export FOO=bar" is not portable (please use FOO=bar && export FOO)';
        # this resets our $. for each file
        close ARGV if eof;
 }