Bug#1148932: libgs_plugin_flatpak.so missing RUNPATH for libgnomesoftware.so.22

[Ovi Cazacu]

Package: gnome-software-plugin-flatpak
Version: 48.3-2
Severity: important

-- Description --

/usr/lib/x86_64-linux-gnu/gnome-software/plugins-22/libgs_plugin_flatpak.so
depends on libgnomesoftware.so.22, which is installed at
/usr/lib/x86_64-linux-gnu/gnome-software/libgnomesoftware.so.22 (a
non-standard library path, not on the default linker search path).

`ldd` confirms the dependency does not resolve:

    $ ldd .../plugins-22/libgs_plugin_flatpak.so | grep "not found"
        libgnomesoftware.so.22 => not found

`readelf -d ... | grep -i rpath/runpath` returns nothing — the
plugin binary carries no RPATH or RUNPATH pointing back to its own
gnome-software/ subdirectory.

As a result, GNOME Software's plugin loader silently fails to
dlopen() the flatpak plugin — no error shown in the GUI, and the
plugin is simply absent from "enabled plugins" in verbose logs,
despite both gnome-software and gnome-software-plugin-flatpak being
correctly installed at matching versions (48.3-2).

Workaround: manually adding the private library directory to the
system linker path resolves it:

    echo "/usr/lib/x86_64-linux-gnu/gnome-software" | \
        sudo tee /etc/ld.so.conf.d/gnome-software.conf
    sudo ldconfig

After this, `ldd` resolves the dependency and the flatpak plugin
loads and appears in "enabled plugins" at gnome-software startup.

This should be fixed in the package itself — either by adding a
RUNPATH/RPATH to the affected plugin .so files at build time, or by
shipping the equivalent ld.so.conf.d snippet as part of the
gnome-software package — rather than requiring a manual system-wide
linker config change.

-- System Information --
gnome-software: 48.3-2
gnome-software-plugin-flatpak: 48.3-2
Distribution: Debian Trixie (13)
Architecture: amd64
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