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From: Felipe Contreras <felipe.contreras@gmail.com>
To: Jeff King <peff@peff.net>, Felipe Contreras <felipe.contreras@gmail.com>
Cc: git@vger.kernel.org, "Junio C Hamano" <gitster@pobox.com>,
	"brian m . carlson" <sandals@crustytoothpaste.net>,
	"Martin Ågren" <martin.agren@gmail.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: Re: [PATCH v2 3/5] doc: remove unnecessary rm instances
Date: Sat, 15 May 2021 07:04:05 -0500	[thread overview]
Message-ID: <609fb8b5bf799_e173a20897@natae.notmuch> (raw)
In-Reply-To: <YJ+TQiYVgocUBQRV@coredump.intra.peff.net>

Jeff King wrote:
> On Fri, May 14, 2021 at 06:56:29AM -0500, Felipe Contreras wrote:
> 
> > Commits 50cff52f1a (When generating manpages, delete outdated targets
> > first., 2007-08-02) and f9286765b2 (Documentation/Makefile: remove
> > cmd-list.made before redirecting to it., 2007-08-06) created these rm
> > instances for a very rare corner-case: building as root by mistake.
> > 
> > It's odd to have workarounds here, but nowhere else in the Makefile--
> > which already fails in this stuation, starting from
> > Documentation/technical/.
> 
> Aren't there tons more that you end up removing in the next patch? E.g.:
> 
>    doc.dep : $(docdep_prereqs) $(DOC_DEP_TXT) build-docdep.perl
>   -       $(QUIET_GEN)$(RM) $@+ $@ && \
>   -       $(PERL_PATH) ./build-docdep.perl >$@+ $(QUIET_STDERR) && \
>   -       mv $@+ $@
>   +       $(QUIET_GEN)$(PERL_PATH) ./build-docdep.perl >$@ $(QUIET_STDERR)
> 
> That does differ in that it removes $@+, too, but the premise is the
> same (we know that $@+ could not be a problem, as we're about to
> clobber it anyway).
> 
> I'm OK with getting rid of all of them, but it seems like it ought to be
> happening all in this patch.

Yeah, but the rationale is different.

  1. $(RM) $@: these remove the target file because of permissions
     (i.e. root owned)
  2. $(RM) $@+ $@ && $(CODE) && mv $@+ $@: these are for interrupted builds

To get rid of #2 we need an alternative solution, like .DELETE_ON_ERROR,
to get rid of #1 we don't, we can just do it.

-- 
Felipe Contreras

  reply	other threads:[~2021-05-15 12:04 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-14 11:56 [PATCH v2 0/5] doc: asciidoc cleanups Felipe Contreras
2021-05-14 11:56 ` [PATCH v2 1/5] doc: refactor common asciidoc dependencies Felipe Contreras
2021-05-14 11:56 ` [PATCH v2 2/5] doc: improve " Felipe Contreras
2021-05-14 11:56 ` [PATCH v2 3/5] doc: remove unnecessary rm instances Felipe Contreras
2021-05-15  9:24   ` Jeff King
2021-05-15 12:04     ` Felipe Contreras [this message]
2021-05-17  8:53       ` Jeff King
2021-05-17 10:42         ` Felipe Contreras
2021-05-17 11:40           ` Jeff King
2021-05-14 11:56 ` [PATCH v2 4/5] doc: simplify Makefile using .DELETE_ON_ERROR Felipe Contreras
2021-05-14 11:56 ` [PATCH v2 5/5] doc: avoid using rm directly Felipe Contreras

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