Re: [Bug] incorrect warning when I type rm /*

[Daniel Shahaf <d.s@daniel.shahaf.name>]

Jonas Bräutigam wrote on Wed, 01 Jul 2020 12:02 +0200:
> Hello,
> 
> these days I wrote a command wrong. Instead of
> 
> "$ rm ./*" <- deleting  in the current directory
> 
> I wrote:
> 
> "$ rm /*" <- deleting in the root path "/"
> 
> zsh warn me with:
> 
> "zsh: sure you want to delete all 4 files in /home/[user]/Downloads [yn]?"
> 
> After I typed "y", it tried to delete the files in "/".
> 
> So the correct warning should be:
> 
> "zsh: sure you want to delete all X files in / [yn]?"
> 
> 
> I use debian 10.4 with no "rm"-specifiy plugin.
> 
> 
> Whatch out If you try it! :D

Thanks; it's a path arithmetic edge case:

diff --git a/Src/exec.c b/Src/exec.c
index 045b5d2b9..7120a2c34 100644
--- a/Src/exec.c
+++ b/Src/exec.c
@@ -3401,7 +3401,7 @@ execcmd_exec(Estate state, Execcmd_params eparams,
 		int rmall;
 
 		s[l - 2] = 0;
-		rmall = checkrmall(s);
+		rmall = checkrmall(l == 2 ? "/" : s);
 		s[l - 2] = t;
 
 		if (!rmall) {

The "Is the dir empty?" logic likewise operated on $PWD rather than /,
so if someone runs «rm /*» as root in an empty directory, the
RM_STAR_SILENT confirmation prompt would not appear at all.

I haven't figured out how to write a test for this (short of using
expect(1) or so).

Cheers,

Daniel