[PATCH v2 4/8] tests: add a check for unportable env --unset

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

The "env --unset=*" argument isn't portable. Neither Solaris or AIX
have it, and probably not a bunch of other POSIX-like OS's.

Using this was suggested on-list[1]. Let's add a check for it so it
doesn't sneak into the codebase in the future.

1. https://public-inbox.org/git/cover.1544573604.git.jonathantanmy@google.com/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 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 b45bdac688..1cfb4608ee 100755
--- a/t/check-non-portable-shell.pl
+++ b/t/check-non-portable-shell.pl
@@ -35,6 +35,7 @@ sub err {
 		chomp;
 	}
 
+	/\benv (?:-u|--unset)\b/ and err 'env [-u|--unset] is not portable';
 	/\bsed\s+-i/ and err 'sed -i is not portable';
 	/\becho\s+-[neE]/ and err 'echo with option is not portable (use printf)';
 	/^\s*declare\s+/ and err 'arrays/declare not portable';
-- 
2.20.0.405.gbc1bbc6f85