Re: ls-remote bug

[Bagas Sanjaya <bagasdotme@gmail.com>]

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On Tue, Oct 24, 2023 at 10:55:24AM +0000, Lior Zeltzer wrote:
> 
> >uname -a
> Linux dc3lp-veld0045 3.10.0-1160.21.1.el7.x86_64 #1 SMP Tue Mar 16 18:28:22 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
> 
> Gerrit version :
> 3.8.0
> 
> Bug description : 
> When running ls-remote : sometime data gets cut in the middle
> 
> Reproducing :
> You need a few files with a few repo names (I used 4 files with 10 repos each)
> Call then l1..l4
> And the code below just cd into each of them does ls-remote twice and compares the data
> Doing it in parallel on all lists.
> Data received in both ls-remotes should be the same , if not, it prints ***
> Repos should contain a lot of tags and refs

What repo did you find this regression? Did you mean linux.git (Linux kernel)?

> 
> Note : 
> 1.  without stderr redirection (2>&1) all works well
> 2. On local repos (not through gerrit) all works well
> 
> I compared various git vers and found the bug to be between 2.31.8 and 2.32.0
> Comparing ls-remote.c file between those vers gave me :
> 
> Lines :
> if (transport_disconnect(transport))
> 		return 1;
> 
> moved to end of sub
> 
> copying ls-remote.c from 2.31.8 to 2.32.0 - fixed the bug
> 
> 
> 
> Code reproducing bug :
> 
> #!/proj/mislcad/areas/DAtools/tools/perl/5.10.1/bin/perl -w
> use strict;
> use Cwd qw(cwd);
> 
> my $count = 4;
> for my $f (1..$count) {
>   my $child = fork();
>   if (!$child) {
>     my $curr = cwd();
>     
>     my @repos = `cat l$f`;
>     foreach my $repo (@repos) {
>       chomp $repo;
>       print "$repo\n";
>       chdir($repo);
>       my $remote_tags_str = `git ls-remote  2>&1`;
>       my $remote_tags_str2 = `git ls-remote  2>&1 `;
>       chdir($curr);
>       if ( $remote_tags_str ne $remote_tags_str2) {
>          print "***\n";
>       }
>     }
>   
>     exit(0);
>   }
> }
> while (wait != -1) {}
> 1;
> 

I tried reproducing this regression by:

```
$ cd /path/to/git.git
$ git ls-remote 2>&1 > /tmp/root.list
$ cd builtin/
$ git ls-remote 2>&1 > /tmp/builtin.list
$ cd ../
$ git diff --no-index /tmp/root.list /tmp/builtin.list
```

And indeed, the diff was empty (which meant that both listings are same).

Confused...

-- 
An old man doll... just what I always wanted! - Clara

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