[committed][gdb] Don't return non-existing path in debuginfod_source_query

[Tom de Vries <tdevries@suse.de>]

On 11/16/20 12:16 PM, Tom de Vries wrote:
> Hi,
> 
> When setting env var DEBUGINFOD_URLS to " " and running the testsuite, we run
> into these regressions:
> ...
> FAIL: gdb.base/list-missing-source.exp: info source
> FAIL: gdb.base/source-dir.exp: info source before setting directory search list
> ...
> 
> Setting var DEBUGINFOD_URLS to " " allows the debuginfod query function
> debuginfod_source_query to get past its early exit.
> 
> The function debuginfod_source_query is documented as: "If the file is
> successfully retrieved, its path on the local machine is stored in DESTNAME".
> 
> However, in case we get back -ENOENT from libdebuginfod, we still set
> DESTNAME:
> ....
>   if (fd.get () < 0 && fd.get () != -ENOENT)
>     printf_filtered (_("Download failed: %s.  Continuing without source file %ps.\n"),
>                      safe_strerror (-fd.get ()),
>                      styled_string (file_name_style.style (),  srcpath));
>   else
>     *destname = make_unique_xstrdup (srcpath);
> 
>   return fd;
> ...
> 
> Fix this by making debuginfod_source_query fit it's documentation and only
> setting DESTNAME when successfully retrieving a file.  Likewise in
> debuginfod_debuginfo_query.
> 
> Any comments?
> 

Now committed.

Thanks,
- Tom

> [gdb] Don't return non-existing path in debuginfod_source_query
> 
> gdb/ChangeLog:
> 
> 2020-11-16  Tom de Vries  <tdevries@suse.de>
> 
> 	* debuginfod-support.c (debuginfod_source_query)
> 	(debuginfod_debuginfo_query): Only set DESTNAME if successful.
> 
> ---
>  gdb/debuginfod-support.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/gdb/debuginfod-support.c b/gdb/debuginfod-support.c
> index a7c76ab6134..e21b2f40cae 100644
> --- a/gdb/debuginfod-support.c
> +++ b/gdb/debuginfod-support.c
> @@ -134,7 +134,8 @@ debuginfod_source_query (const unsigned char *build_id,
>      printf_filtered (_("Download failed: %s.  Continuing without source file %ps.\n"),
>  		     safe_strerror (-fd.get ()),
>  		     styled_string (file_name_style.style (),  srcpath));
> -  else
> +
> +  if (fd.get () >= 0)
>      *destname = make_unique_xstrdup (srcpath);
>  
>    return fd;
> @@ -169,7 +170,8 @@ debuginfod_debuginfo_query (const unsigned char *build_id,
>  		     safe_strerror (-fd.get ()),
>  		     styled_string (file_name_style.style (),  filename));
>  
> -  destname->reset (dname);
> +  if (fd.get () >= 0)
> +    destname->reset (dname);
>  
>    return fd;
>  }
>