GNU bug report logs - #29700
Java packages need to retain references

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ricardo Wurmus <rekado <at> elephly.net>
Subject: bug#29700: closed (Re: bug#29700: Java packages need to retain
 references)
Date: Thu, 14 Dec 2017 23:47:02 +0000

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Your bug report

#29700: Java packages need to retain references

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 29700 <at> debbugs.gnu.org.

-- 
29700: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=29700
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Ricardo Wurmus <rekado <at> elephly.net>
To: Gábor Boskovits <boskovits <at> gmail.com>
Cc: 29700-done <at> debbugs.gnu.org
Subject: Re: bug#29700: Java packages need to retain references
Date: Thu, 14 Dec 2017 23:59:22 +0100

Hi Gábor,

The manifest file would not be sufficient.  Take the example of
“java-usb4java”.  It provides a file “share/java/usb4java.jar”, which
contains this manifest:

--8<---------------cut here---------------start------------->8---
Manifest-Version: 1.0
Created-By: 1.7.0_161 (Oracle Corporation)

--8<---------------cut here---------------end--------------->8---

When you open the Loader.class file that is included in the archive you
will notice that it contains this string:

    /gnu/store/iwjqaqr98daqbgwswqi5fi4w891bqh7d-libusb4java-0-1.396d642a5/lib/libusb4java.so

This reference is currently dropped because it cannot be detected in a
compressed archive.  The reference is not contained in the manifest, and
at build time we could only guess which references should be added to
the manifest.

Unless we extend the reference scanner to deal with compressed files I
think that disabling compression in jars is the best approach.

I’ll push this to master.

--
Ricardo

GPG: BCA6 89B6 3655 3801 C3C6  2150 197A 5888 235F ACAC
https://elephly.net

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From: Ricardo Wurmus <rekado <at> elephly.net>
To: bug-guix <at> gnu.org
Subject: Java packages need to retain references
Date: Wed, 13 Dec 2017 23:48:24 +0100

I installed the “axoloti-patcher” package today after “guix gc” and
noticed that not all dependencies are available at runtime.  Upon
running the “Axoloti” command I got this error:

    Exception in thread "AWT-EventQueue-0" java.lang.UnsatisfiedLinkError: Can't load library: /gnu/store/nrx5nmwynmsl7aqxdpgwpsm8ff9b0h4d-libusb4java-0-1.396d642a5/lib/libusb4java.so

The store item does not exist.

The problem here is that jar archives are compressed and thus any
references they contain are thus hidden from the scanner.

I don’t know if it is feasible to disable compression for jar files, or
if we should install a “.guix-dependencies” file that contains plain
text references.

I’ll investigate disabling compression first.  Looks like we can do this
in the strip-jar-timestamps phase where we use “zip” to repack the jar.
Adding “-0” to the arguments should be enough to make this work.

I’ll send a patch soon.

--
Ricardo

GPG: BCA6 89B6 3655 3801 C3C6  2150 197A 5888 235F ACAC
https://elephly.net

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