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From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
To: "SZEDER Gábor" <szeder.dev@gmail.com>
Cc: Johannes Sixt <j6t@kdbg.org>,
	"brian m. carlson" <sandals@crustytoothpaste.net>,
	git@vger.kernel.org, Jeff King <peff@peff.net>,
	Duy Nguyen <pclouds@gmail.com>,
	Jonathan Tan <jonathantanmy@google.com>,
	Eric Sunshine <sunshine@sunshineco.com>,
	Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v2 01/10] t: add helper to convert object IDs to paths
Date: Wed, 19 Jun 2019 21:56:41 +0200 (CEST)	[thread overview]
Message-ID: <nycvar.QRO.7.76.6.1906192155560.44@tvgsbejvaqbjf.bet> (raw)
In-Reply-To: <20190618165525.GN31952@szeder.dev>

[-- Attachment #1: Type: text/plain, Size: 1345 bytes --]

Hi,

On Tue, 18 Jun 2019, SZEDER Gábor wrote:

> On Tue, Jun 18, 2019 at 06:15:46PM +0200, Johannes Schindelin wrote:
> > > Regardless of how it is implemented, I have another gripe with this
> > > helper: the way it must be used requires a process: $(test_out_to_path
> > > $foo)
> >
> > Indeed.
> >
> > > And looking through this patch series, I see a gazillion of *new*
> > > process substitutions $(test_something...) and $(basename $whatever).
> > > Can't we do something about it?
> >
> > I wish there was. Unix shell scripting has not evolved much in the past,
> > what, 3 decades? So I don't really see a way to "pass variables by
> > reference" to shell functions, short of calling `eval` (which buys
> > preciously little as it _also_ has to spawn a new process [*1*]).
>
> > Footnote *1*: Theoretically, it could be a *ton* faster by using threads
> > on Windows. But threads are pretty much an afterthought on Unix/Linux, so
> > no mainstream POSIX shell supports this. They all `fork()` to interpret an
> > `eval` as far as I can tell.
>
> 'eval' doesn't fork().  It can't possibly fork(), because if it did,
> then any variables set in the eval-ed code snippet couldn't be visible
> outside the 'eval'.

Good point. My brain must have made a couple of incorrect associations
there.

Sorry,
Dscho

  reply	other threads:[~2019-06-19 19:56 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-16 18:53 [PATCH v2 00/10] Hash-independent tests, part 4 brian m. carlson
2019-06-16 18:53 ` [PATCH v2 01/10] t: add helper to convert object IDs to paths brian m. carlson
2019-06-17 19:05   ` Johannes Schindelin
2019-06-18  1:29     ` brian m. carlson
2019-06-18  6:14       ` Johannes Sixt
2019-06-18 16:15         ` Johannes Schindelin
2019-06-18 16:55           ` SZEDER Gábor
2019-06-19 19:56             ` Johannes Schindelin [this message]
2019-06-18 17:04           ` Jeff King
2019-06-19 19:55             ` Johannes Schindelin
2019-06-18 23:03         ` brian m. carlson
2019-06-16 18:53 ` [PATCH v2 02/10] t1410: make hash size independent brian m. carlson
2019-06-16 18:53 ` [PATCH v2 03/10] t1450: " brian m. carlson
2019-06-16 18:53 ` [PATCH v2 04/10] t5000: make hash independent brian m. carlson
2019-06-16 18:53 ` [PATCH v2 05/10] t6030: make test work with SHA-256 brian m. carlson
2019-06-16 18:53 ` [PATCH v2 06/10] t0027: make hash size independent brian m. carlson
2019-06-16 18:53 ` [PATCH v2 07/10] t0090: make test pass with SHA-256 brian m. carlson
2019-06-16 18:53 ` [PATCH v2 08/10] t1007: remove SHA1 prerequisites brian m. carlson
2019-06-16 18:53 ` [PATCH v2 09/10] t1710: make hash independent brian m. carlson
2019-06-16 18:53 ` [PATCH v2 10/10] t2203: avoid hard-coded object ID values brian m. carlson

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