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Date: Mon, 13 Feb 2023 17:42:48 +0000 (GMT)
From: Peter Stephenson
To: Zsh hackers list
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In-Reply-To: <1721279218.10760102.1675694027023@mail.virginmedia.com>
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<1721279218.10760102.1675694027023@mail.virginmedia.com>
Subject: Re: [BUG] NO_EXEC should not exec $NULLCMD
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> On 06/02/2023 14:33 Peter Stephenson wrote:
> > On 06/02/2023 12:22 Marlon Richert wrote:
> > Steps to reproduce:
> > % PS1='%# ' zsh -f
> > % zsh -nc ': $( < $1 )'; print $?
> > zsh:1: no such file or directory:
> > 1
>
> $(<$1) is special syntax to open $1 and insert it on the command line;
> it's nothing to do with $NULLCMD, nor is anything being executed.
> So --- given the way NO_EXEC doesn't have a very detailed specification
> in zsh --- I don't think it's actually violating any designed behaviour
> (that's quite a weak statement in these parts).
>
> However, it is a reasonable question whether the redirection should
> be taking place here at all, as it doesn't in other cases when
> NO_EXEC is set, even if that's mostly a side effect of where the NO_EXEC
> logic lives, so it's certainly quite confusing. If not, it shouldn't
> be hard to suppress.
This is probably uncontroversial.
pws
diff --git a/Src/exec.c b/Src/exec.c
index c8eb71b34..3330bbce8 100644
--- a/Src/exec.c
+++ b/Src/exec.c
@@ -4678,6 +4678,9 @@ getoutput(char *cmd, int qt)
if (!prog)
return NULL;
+ if (!isset(EXECOPT))
+ return newlinklist();
+
if ((s = simple_redir_name(prog, REDIR_READ))) {
/* $(< word) */
int stream;
diff --git a/Test/E01options.ztst b/Test/E01options.ztst
index d38fbed74..533e08773 100644
--- a/Test/E01options.ztst
+++ b/Test/E01options.ztst
@@ -416,6 +416,9 @@
1:NO_EXEC does recognize bad substitution syntax
*?* bad substitution
+ (setopt noexec; : $(