[PATCH v3] localedata: Avoid concurrently written locales in gen-locale.sh

[Florian Weimer]

* Florian Weimer:

> There is no cross-directory exclusion of concurrent $(gen-locales)
> usage.  Parallel localedef calls can clobber locale data as it is
> being loaded by tests.
>
> With --no-hard-links, the separate touch invocation is now longer
> necessary.
>
> ---
> v2: Avoid mv options.  Probably more portable.
> v3: Add missing mkdir call.  Test is still running.
>  localedata/gen-locale.sh | 26 ++++++++++++++++++--------
>  1 file changed, 18 insertions(+), 8 deletions(-)
>
> diff --git a/localedata/gen-locale.sh b/localedata/gen-locale.sh
> index 4762c04284..013d26eafb 100644
> --- a/localedata/gen-locale.sh
> +++ b/localedata/gen-locale.sh
> @@ -32,17 +32,27 @@ generate_locale ()
>    out=$3
>    flags=$4
>    ret=0
> +
> +  # Use a staging area to avoid writing to locales concurrently.
> +  # While this process is running, $$ is sufficiently unique.
> +  # Use --no-hard-links to prevent localedef from accessing
> +  # other staging areas.
> +  stage="${common_objpfx}localedata/gen-locale.$$.tmp"
> +  mkdir "$stage" 2>/dev/null || true

Oh well.  With these changes, --no-hard-links is no longer needed
(no peer directories to check).  Should I leave it in?

Thanks,
Florian