Bug 642672 – sys-apps/portage: deleting and reinstalling a package fails (sometime) when two needed libraries with the same name are kept

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description Tupone Alfredo 2017-12-29 20:48:22 UTC]

When I do emerge -C of a package that have shared libraries needed by someone, those libraries are kept. If I emerge back the same package those libraries are substituted without any error.

On many of dev-ada/* packages there are symlink on the /usr/lib directory that point to the true file that is in a subdirectory. During removal of the package both symlink and true file are kept, but emerging back the package portage warns (or error out) saying that the symlinks are not owned by anyone

[Comment 1 Zac Medico 2017-12-29 21:42:31 UTC]

Please attach a copy of /var/lib/portage/preserved_libs_registry from immediately after the package is unmerged.

[Comment 2 Tupone Alfredo 2017-12-30 08:04:18 UTC]

Created attachment 512022 [details]
preserved_libs_registry

I did a cat of the file just before the end of the unmerging and I got 
{
    "dev-ada/xmlada:0": [
        "dev-ada/xmlada-2017", 
        "7001", 
        [
            "/usr/lib/libxmlada_dom.so.18.0w", 
            "/usr/lib/xmlada/xmlada_dom.relocatable/libxmlada_dom.so.18.0w", 
            "/usr/lib/libxmlada_input_sources.so.18.0w", 
            "/usr/lib/xmlada/xmlada_sax.relocatable/libxmlada_sax.so.18.0w", 
            "/usr/lib/libxmlada_sax.so.18.0w", 
            "/usr/lib/xmlada/xmlada_schema.relocatable/libxmlada_schema.so.18.0w", 
            "/usr/lib/libxmlada_unicode.so.18.0w", 
            "/usr/lib/libxmlada_schema.so.18.0w", 
            "/usr/lib/xmlada/xmlada_input.relocatable/libxmlada_input_sources.so.18.0w", 
            "/usr/lib/xmlada/xmlada_unicode.relocatable/libxmlada_unicode.so.18.0w"
        ]
    ]
}

The attached file is instead the final one

[Comment 3 Zac Medico 2018-01-02 08:55:12 UTC]

This code from bug 406837 removes the symlinks from the preserved_libs_registry:

https://gitweb.gentoo.org/proj/portage.git/commit/?id=32d19be14e22ada479963ba8627452f5f2d89b94

[Comment 4 Zac Medico 2018-01-02 09:23:03 UTC]

Created attachment 512698 [details, diff]
PreservedLibsRegistry: fix pruneNonExisting for symlinks to other dirs

This patch should fix it. You can apply the patch by saving it in /etc/portage/patches/sys-apps/portage/ and rebuilding portage.

[Comment 5 Zac Medico 2018-01-02 13:24:12 UTC]

Created attachment 512714 [details, diff]
PreservedLibsRegistry: fix pruneNonExisting for symlinks to other dirs

Add missing import.

[Comment 6 Tupone Alfredo 2018-01-02 22:09:17 UTC]

This patch fix my problem. Thanks

[Comment 7 Larry the Git Cow 2018-01-02 23:04:52 UTC]

The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/proj/portage.git/commit/?id=b9fc8e55f96c17aeece87387226ada1b184d2f77

commit b9fc8e55f96c17aeece87387226ada1b184d2f77
Author:     Zac Medico <[e-mail]>
AuthorDate: 2018-01-02 09:09:34 +0000
Commit:     Zac Medico <[e-mail]>
CommitDate: 2018-01-02 23:02:39 +0000

    PreservedLibsRegistry: fix pruneNonExisting for symlinks to other dirs (bug 642672)
    
    Fix pruneNonExisting to use the abssymlink function to detect symlinks
    in the registry that no longer point to a preserved library. The previous
    code only worked correctly for symlinks pointing to files in the same
    directory, which failed for packages like dev-ada/xmlada which have
    symlinks that point into a subdirectory.
    
    Fixes: 32d19be14e22 ("pruneNonExisting: handle eselect-opengl symlinks")
    Tested-by: Tupone Alfredo <[e-mail]>
    Bug: https://bugs.gentoo.org/642672

 pym/portage/util/_dyn_libs/PreservedLibsRegistry.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)}

[Comment 8 Zac Medico 2018-01-02 23:06:04 UTC]

Thanks for confirmation!