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Date: Thu, 9 Jan 2020 15:41:45 +0000
From: Daniel Shahaf <d.s@daniel.shahaf.name>
To: zsh-users@zsh.org
Subject: Unreadable directories aren't included in glob expansion
Message-ID: <20200109154145.rqksfenozx6745rn@tarpaulin.shahaf.local2>
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Consider:

% mkdir foo
% mkdir -m 000 bar 
% echo */ 
foo/
% echo *(/)
bar foo
% 

Shouldn't the expansion of «*/» include «bar/»?

The shell knows, in that situation, that ./bar is a directory; «test -d bar»
and «zstat -or bar» both confirm this.

dash/bash/ksh all include «bar/» in that expansion.  

strace shows a probable cause:
.
    access("buster/.", F_OK)                = -1 EACCES (Permission denied)

I've discussed this on IRC with Eric, but I'd rather let him explain his view
in his own words.

Cheers,

Daniel

P.S. Test case:

diff --git a/Test/D02glob.ztst b/Test/D02glob.ztst
index 5638e1255..1c1663a48 100644
--- a/Test/D02glob.ztst
+++ b/Test/D02glob.ztst
@@ -728,3 +728,10 @@
 >does/not/exist
 >not/exist
 >exist
+
+ mkdir -m 000 glob.tmp/secret1
+ (setopt nullglob
+  echo glob.tmp/*/ glob.tmp/*(/)
+  )
+-f:unreadable directories can be globbed
+>glob.tmp/secret1/ glob.tmp/secret1