From: "Ludovic Courtès" <ludo@gnu.org>
To: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Cc: 58812@debbugs.gnu.org
Subject: [bug#58812] [PATCH 0/5] Add --symlink option to 'guix shell'.
Date: Thu, 10 Nov 2022 15:17:17 +0100 [thread overview]
Message-ID: <87sfiqhp1u.fsf@gnu.org> (raw)
In-Reply-To: <87fsery05t.fsf@gmail.com> (Maxim Cournoyer's message of "Wed, 09 Nov 2022 22:10:38 -0500")
Hi Maxim!
Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:
>> We should refrain from using @ref in sentences (info "(texinfo) @ref").
>> Instead, I’d write:
>>
>> documented for @command{guix pack} (@pxref{pack-symlink-option}).
>
> I've heard that from you before, but is there a reason against? I like
> to know the rationale for doing things a certain way, lest I forget :-).
> From info '(texinfo) @ref':
It’s right below the bit you quoted:
The '@ref' command can tempt writers to express themselves in a
manner that is suitable for a printed manual but looks awkward in the
Info format. Bear in mind that your audience could be using both the
printed and the Info format. For example: […]
>>> +(define (make-symlink->directives directory)
>>> + "Return a procedure that turn symlinks specs into directives that target
>>> +DIRECTORY."
>>> + (match-lambda
>>> + ((source '-> target)
>>> + (let ((target (string-append directory "/" target))
>>> + (parent (dirname source)))
>>> + ;; Never add a 'directory' directive for "/" so as to preserve its
>>> + ;; ownership and avoid adding the same entries multiple times.
>>> + `(,@(if (string=? parent "/")
>>> + '()
>>> + `((directory ,parent)))
>>> + ;; Note: a relative file name is used for compatibility with
>>> + ;; relocatable packs.
>>> + (,source -> ,(relative-file-name parent target)))))))
>>
>> I think it’s a case where I would refrain from factorizing because this
>> procedure, as shown by the comments and the use of ‘relative-file-name’,
>> is specifically tailored for the needs to ‘guix pack -f tarball’.
>>
>> I’d prefer to have a similar but independently maintained variant of
>> this procedure in (guix scripts environment) to avoid difficulties down
>> the road.
>
> I considered to duplicate it, but I opted to reuse it in the end because
> I care that the behavior is exactly the same between the two actions
> (guix shell --symlink vs guix pack --symlink). If the way we handle
> this is to be changed in the future, I'd want both to be changed at
> once, so they remain consistent. Does this make sense?
They don’t have to be consistent. Use of ‘relative-file-name’ here for
example is dictated by the needs of relocatable packs. It doesn’t have
to be this way here.
I think it’s best to keep separate copies here (they likely won’t be
exactly the same).
>>> +++ b/guix/scripts/environment.scm
>>> @@ -33,8 +33,10 @@ (define-module (guix scripts environment)
>>> #:use-module ((guix gexp) #:select (lower-object))
>>> #:use-module (guix scripts)
>>> #:use-module (guix scripts build)
>>> + #:use-module ((guix scripts pack) #:select (symlink-spec-option-parser))
>>
>> You can turn this into #:autoload so we don’t pay the price when not
>> using ‘--symlink’.
>
> Done! Could Guile simply always use lazy loading (autoload by default)?
#:select could be synonymous with #:autoload, if that’s what you mean,
but in general Guile cannot know whether autoloading is semantically
equivalent to eagerly loading: there might be side-effects happening
when the top-level of the module runs.
> Otherwise, when is it OK to use autoload and when is it not?
#:autoload exists as a way to amortize initialization costs and make
sure only necessary functionality gets loaded, thereby reducing CPU and
memory usage.
Only the module user can tell whether #:autoload is appropriate. In
general you’d use it for optional functionality that has a
non-negligible memory footprint or that would noticeably degrade startup
time.
Ludo’.
next prev parent reply other threads:[~2022-11-10 14:18 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-27 3:41 [bug#58812] [PATCH 0/5] Add --symlink option to 'guix shell' Maxim Cournoyer
2022-10-27 3:50 ` [bug#58812] [PATCH 1/5] Makefile.am: Sort EXTRA_DIST entries Maxim Cournoyer
2022-10-27 3:50 ` [bug#58812] [PATCH 2/5] tests: Add a tests/utils.sh support file Maxim Cournoyer
2022-11-09 21:07 ` [bug#58812] [PATCH 0/5] Add --symlink option to 'guix shell' Ludovic Courtès
2022-11-10 3:38 ` Maxim Cournoyer
2022-11-10 4:23 ` [bug#59164] [PATCH v2 1/4] Makefile.am: Sort EXTRA_DIST entries Maxim Cournoyer
2022-11-10 4:23 ` [bug#59161] [PATCH v2 2/4] install: Validate symlink target in evaluate-populate-directive Maxim Cournoyer
2022-11-10 4:23 ` [bug#59162] [PATCH v2 3/4] guix: shell: Add '--symlink' option Maxim Cournoyer
2022-11-10 4:23 ` [bug#59163] [PATCH v2 4/4] shell: Detect --symlink spec problems early Maxim Cournoyer
2022-10-27 3:50 ` [bug#58812] [PATCH 3/5] install: Validate symlink target in evaluate-populate-directive Maxim Cournoyer
2022-11-09 21:06 ` [bug#58812] [PATCH 0/5] Add --symlink option to 'guix shell' Ludovic Courtès
2022-11-10 3:37 ` Maxim Cournoyer
2022-11-17 17:37 ` [bug#59164] Coding style: similarly-named variables Ludovic Courtès
2022-11-17 18:44 ` [bug#58812] " zimoun
2022-11-18 17:02 ` Maxim Cournoyer
2022-11-21 15:02 ` zimoun
2022-11-21 15:52 ` [bug#59164] " zimoun
2022-11-21 20:55 ` Maxim Cournoyer
2022-11-22 14:35 ` [bug#59164] " zimoun
2022-11-25 15:23 ` Guile debugger workgroup? (was: Coding style: similarly-named variables) Maxim Cournoyer
2022-11-26 11:22 ` Guile debugger workgroup? Ludovic Courtès
2022-11-27 3:16 ` Maxim Cournoyer
2022-11-28 10:53 ` Ludovic Courtès
2022-11-28 13:41 ` Attila Lendvai
2022-11-28 14:50 ` Maxim Cournoyer
2022-11-29 8:46 ` Ludovic Courtès
2022-11-30 3:44 ` Attila Lendvai
2022-11-27 12:04 ` zimoun
2022-11-28 0:27 ` Maxim Cournoyer
2022-11-28 11:06 ` Ludovic Courtès
2022-11-28 12:31 ` zimoun
2022-11-27 20:46 ` Attila Lendvai
2022-11-28 0:41 ` David Pirotte
2022-11-28 0:45 ` David Pirotte
2022-11-28 2:06 ` Maxim Cournoyer
2022-11-28 7:22 ` Joshua Branson
2022-11-28 11:09 ` Ludovic Courtès
2022-11-28 14:12 ` Attila Lendvai
2022-11-29 8:54 ` Ludovic Courtès
2022-11-28 12:24 ` Guile debugger workgroup? (was: Coding style: similarly-named variables) Csepp
2022-11-30 7:09 ` Guile debugger workgroup? Jannneke Nieuwenhuizen
2022-11-26 14:47 ` [bug#58812] [bug#59164] Coding style: similarly-named variables Ludovic Courtès
2022-11-17 20:34 ` Maxim Cournoyer
2022-11-20 10:46 ` [bug#58812] " Ludovic Courtès
2022-10-27 3:50 ` [bug#58812] [PATCH 4/5] guix: shell: Add '--symlink' option Maxim Cournoyer
2022-11-09 20:58 ` [bug#58812] [PATCH 0/5] Add --symlink option to 'guix shell' Ludovic Courtès
2022-11-10 3:10 ` Maxim Cournoyer
2022-11-10 14:17 ` Ludovic Courtès [this message]
2022-11-10 14:49 ` Maxim Cournoyer
2022-11-10 15:16 ` Maxim Cournoyer
2022-11-14 9:18 ` Ludovic Courtès
2022-11-10 16:05 ` [bug#58812] [PATCH v3 1/4] Makefile.am: Sort EXTRA_DIST entries Maxim Cournoyer
2022-11-10 16:05 ` [bug#58812] [PATCH v3 2/4] install: Validate symlink target in evaluate-populate-directive Maxim Cournoyer
2022-11-10 16:05 ` [bug#58812] [PATCH v3 3/4] guix: shell: Add '--symlink' option Maxim Cournoyer
2022-11-10 16:05 ` [bug#58812] [PATCH v3 4/4] shell: Detect --symlink spec problems early Maxim Cournoyer
2022-11-16 19:03 ` [bug#58812] [PATCH 0/5] Add --symlink option to 'guix shell' zimoun
2022-11-16 19:34 ` Maxim Cournoyer
2022-10-27 3:51 ` [bug#58812] [PATCH 5/5] shell: Detect --symlink spec problems early Maxim Cournoyer
2022-11-15 21:24 ` bug#58812: [PATCH v3 1/4] " Maxim Cournoyer
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