[PATCH v3 5/5] check-non-portable-shell: improve `VAR=val shell-func` detection
- From
- Eric Sunshine <ericsunshine@charter.net>
- Date
- Jul 27, 2024, 05:35 UTC
- Message-ID
- <20240727053509.34339-6-ericsunshine@charter.net>
- In-Reply-To
- <20240727053509.34339-1-ericsunshine@charter.net>
From: Eric Sunshine <sunshine@sunshineco.com>
The behavior of a one-shot environment variable assignment of the form "VAR=val cmd" is unspecified according to POSIX when "cmd" is a shell function. Indeed the behavior differs between shell implementations and even different versions of the same shell, thus should be avoided.
As such, check-non-portable-shell.pl warns when it detects such usage. However, a limitation of the check is that it only detects such invocations when variable assignment (i.e. `VAR=val`) is the first thing on the line. Thus, it can easily be fooled by an invocation such as:
echo X | VAR=val shell-func
Address this shortcoming by loosening the check so that the variable assignment can be recognized even when not at the beginning of the line.
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com> --- t/check-non-portable-shell.pl | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/t/check-non-portable-shell.pl b/t/check-non-portable-shell.pl index 903af14294..6ee7700eb4 100755 --- a/t/check-non-portable-shell.pl +++ b/t/check-non-portable-shell.pl @@ -49,7 +49,7 @@ sub err { /\bexport\s+[A-Za-z0-9_]*=/ and err '"export FOO=bar" is not portable (use FOO=bar && export FOO)'; /\blocal\s+[A-Za-z0-9_]*=\$([A-Za-z0-9_{]|[(][^(])/ and err q(quote "$val" in 'local var=$val'); - /^\s*([A-Z0-9_]+=(\w*|(["']).*?\3)\s+)+(\w+)/ and exists($func{$4}) and + /\b([A-Z0-9_]+=(\w*|(["']).*?\3)\s+)+(\w+)/ and !/test_env.+=/ and exists($func{$4}) and err '"FOO=bar shell_func" is not portable (use test_env FOO=bar shell_func)'; $line = ''; # this resets our $. for each file
-- 2.45.2