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From: Maxime Devos To: soeren@soeren-tempel.net, bug-guile@gnu.org Cc: guile-devel@gnu.org Message-ID: <936e98a7-a9d2-2607-ef6a-8c0edff19c4a@telenet.be> Subject: Re: [PATCH] load-foreign-library: perform substring match on library files References: <23TGNISPS9PPL.2YOENNQD9V56X@8pit.net> <20220723110919.30107-1-soeren@soeren-tempel.net> In-Reply-To: <20220723110919.30107-1-soeren@soeren-tempel.net> --------------I6tQcbRO09NW77TqhkF0Hfwq Content-Type: multipart/mixed; boundary="------------E6Yf2tdnFB135m1JzBI6K4p3" --------------E6Yf2tdnFB135m1JzBI6K4p3 Content-Type: multipart/alternative; boundary="------------jVyWv6k2lftF6ZZEcSNY3zd7" --------------jVyWv6k2lftF6ZZEcSNY3zd7 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64 DQpPbiAyMy0wNy0yMDIyIDEzOjA5LCBzb2VyZW5Ac29lcmVuLXRlbXBlbC5uZXQgd3JvdGU6 DQo+IEZyb206IFPDtnJlbiBUZW1wZWw8c29lcmVuQHNvZXJlbi10ZW1wZWwubmV0Pg0KPg0K PiBUaGlzIHBhdGNoIGlzIGEgZml4IGZvciBidWcgIzQ5MjMyIFsxXS4gVG8gc3VtbWFyaXpl 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On 23-07-2022 13:09, soeren@soeren-tempel.net wrote:
From: S=C3=B6ren Tempel <soeren@soeren-tempel.net>

This patch is a fix for bug #49232 [1]. To summarize this bug, the
current load-foreign-library implementation does not load versioned
sonames (e.g. libfoo.so.5) which are common on Linux. This is an issue
for us at Alpine Linux since we ship unversioned sonames (e.g. libfoo.so)=

separately. Please refer to the original bug report for details.
 [...]

Long term, I think it would be ideal for Guile to decide upon a major version (and maybe even location, depending on the choices of the distro) at _compile_ time instead of runtime, not unlike how other compilers work.

More concretely, we could have a macro 'link-foreign-library', of the form:

(link-foreign-library library [maybe other arguments).

If the Guile module is being compiled with --rpath, it searches $CROSS_LIBRARY_PATH or $LIBRARY_PATH and encodes the full file name (/usr/lib/.../libguile-... or /gnu/store/.../lib/...) in the .go, which avoids some manual patching we have to do in Guix.

It could also detect if it's loading a libfoo.so pointing to libfoo.so.N, and if so, replace libfoo.so by libfoo.so.N.

The former (rpath) would work for Guix, and I expect the latter (libfoo.so -> libfoo.so.N) to work on Alpine.

+(define (file-exists-in-d=
ir-with-extension dir basename exts)
+  (let* ((dir-stream (opendir dir))
+         (ret (let loop ((fn (readdir dir-stream)))
+                (and (not (eof-object? fn))
+                     (if (filename-matches-with-extension? fn basename e=
xts)
+                       (in-vicinity dir fn)
+                       (loop (readdir dir-stream)))))))
IIUC, the string-prefix? search is non-deterministic, which can make debugging complicated when multiple versions are installed.=C2= =A0 I think it would be better to bail out if there are multiple matches instead of a risk of guessing incorrectly.

The prefixing behaviour is also not documented, so some documentation is needed in the manual.

Questions:

  • Does it go scanning the dir even if libfoo.so could be found?=C2= =A0 Otherwise, there are some possible performance gains by checking for libfoo.so first -- consider the case where /usr/lib is huge.<= br>
  • When doing (load-foreign-library "/gnu/store/.../libfoo.so") (absolute file name!), would it search for /gnu/store/.../libfoo.so.N?=C2=A0 If so, that would be surprising= , especially if libfoo.so.N exists.
  • If doing libfoo.so.N, will it search for libfoo.so.N.M?
  • Does it only apply to the system paths, or also to GUILE_SYSTEM_EXTENSION_PATH, LTDL_LIBRARY_PATH and GUILE_EXTENSION_PATH? The latter would be surprising to me, as versioning is more of a system thing.
  • To test it, and avoid breaking things later with future changes to load-foreign-library, could some tests be added?
  • Is this change desirable?=C2=A0 I mean, this is an FFI API, so = the ABI of the library is rather important. If a Guile module links to libfoo.so, and they had version N in mind, then it's important it doesn't link to N-1 or N+1 instead, because of ABI incompatibilities. As such, to me it seems _good_ that you got some errors, as now you get a reminder to explicitly state which ABI version is needed. (YMMV, and the mileage of the Guile maintainers might vary, etc.)

Also, this seems like a non-trivial change to me, so a copyright line might be in order, unless you did the copyright assignment.

Greetings,
Maxime.

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