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[Bug debuginfod/25502] New: debuginfod client should default to XDG cache


https://sourceware.org/bugzilla/show_bug.cgi?id=25502

            Bug ID: 25502
           Summary: debuginfod client should default to XDG cache
           Product: elfutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: debuginfod
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

The debuginfod client defaults its cache to:

static const char *cache_default_name = ".debuginfod_client_cache";
static const char *cache_path_envvar = DEBUGINFOD_CACHE_PATH_ENV_VAR;
[...]

  if (getenv(cache_path_envvar))
    strcpy(cache_path, getenv(cache_path_envvar));
  else
    {
      if (getenv("HOME"))
        sprintf(cache_path, "%s/%s", getenv("HOME"), cache_default_name);
      else
        sprintf(cache_path, "/%s", cache_default_name);
    }



That is, $HOME/.debuginfod_client_cache in the usual setup.

I think it would be better if this followed the XDG
base directory spec instead. 
https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html

In this case, this text applies:

 $XDG_CACHE_HOME defines the base directory relative to which user specific
non-essential data files should be stored. If $XDG_CACHE_HOME is either not set
or empty, a default equal to $HOME/.cache should be used. 

I would suggest a subdirectory of this, like .../debuginfod_client

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