Building using libunity is not working

[seb128]

Trying to build shotwell -Dunity_support=true the builds fails because the /usr/lib/x86_64-linux-gnu/libunity/libunity-protocol-private.so.0 symbols aren't found

it's probably because

# readelf -d /snap/gnome-42-2204-sdk/current/usr/lib/x86_64-linux-gnu/libunity.so  | grep -i RUNPATH
 0x000000000000001d (RUNPATH)            Library runpath: [/usr/lib/x86_64-linux-gnu/libunity]

Which isn't the right location for the snap. Perhaps we need to build libunity with the right path from source to workaround the issue?

[sergio-costas]

I suspect that the true problem is that libunity-protocol-private.so is placed at /snap/gnome-42-2204-sdk/current/usr/lib/x86_64-linux-gnu/libunity/libunity-protocol-private.so, and that folder isn't in the LD_LIBRARY_PATH. So there are two solutions, in my opinion:

• we can move the library into /snap/gnome-42-2204-sdk/current/usr/lib/x86_64-linux-gnu
• we can add the /snap/gnome-42-2204-sdk/current/usr/lib/x86_64-linux-gnu/libunity in the LD_LIBRARY_PATH in each snap that requires the private library.

Unless, of course, that library is linked at runtime instead of during loading. In that case, maybe the only solution is to use layouts to map it at /usr/lib/x86_64-linux-gnu/libunity

[sergio-costas]

Confirmed: with this, it creates the snap fine.

      - -Dunity_support=true
    build-environment:
      - LD_LIBRARY_PATH: ${LD_LIBRARY_PATH:+$LD_LIBRARY_PATH:}/snap/gnome-42-2204-sdk/current/usr/lib/$CRAFT_ARCH_TRIPLET/libunity