gimp: bad interpreter

[jluttine]

Issue description

I see the following warnings when running gimp:

$ gimp
GIMP-Warning: Bad interpreter referenced in interpreter file /nix/store/0hsy78qmsclkks0v9ykcmvx0wsllwyw8-gimp-with-plugins-2.10.10/lib/gimp/2.0/interpreters/pygimp.interp: python2

GIMP-Warning: Bad binary format string in interpreter file /nix/store/0hsy78qmsclkks0v9ykcmvx0wsllwyw8-gimp-with-plugins-2.10.10/lib/gimp/2.0/interpreters/pygimp.interp

Not sure if they are critical or not. I do have problems with one Python plugin, not sure if this could be related.

Steps to reproduce

Run gimp from the terminal. I'm running it from i3+none desktop environment, if that matters.

Technical details

Please run nix-shell -p nix-info --run "nix-info -m" and paste the
results.

$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 4.19.36, NixOS, 19.09.git.3d081ed (Loris)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.2.2`
 - nixpkgs: `/etc/nixpkgs`

[jtojnar]

I can see the warning too.

This is what the file looks like on Arch:

python=/usr/bin/python2
python2=/usr/bin/python2
/usr/bin/python=/usr/bin/python2
:Python:E::py::python2:

nothing special compared to ours:

python=/nix/store/mb307xgf3x2z6111fkrsqdvh3gf9bk19-python-2.7.16/bin/python2
python2=/nix/store/mb307xgf3x2z6111fkrsqdvh3gf9bk19-python-2.7.16/bin/python2
/usr/bin/python=/nix/store/mb307xgf3x2z6111fkrsqdvh3gf9bk19-python-2.7.16/bin/python2
:Python:E::py::python2:

The file exists and is executable

$ file /nix/store/mb307xgf3x2z6111fkrsqdvh3gf9bk19-python-2.7.16/bin/python2
/nix/store/mb307xgf3x2z6111fkrsqdvh3gf9bk19-python-2.7.16/bin/python2: symbolic link to python2.7
$ file --dereference /nix/store/mb307xgf3x2z6111fkrsqdvh3gf9bk19-python-2.7.16/bin/python2
/nix/store/mb307xgf3x2z6111fkrsqdvh3gf9bk19-python-2.7.16/bin/python2: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /nix/store/siks2gcfwx6qwh27m7c5r5lixcr621bd-glibc-2.27/lib/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, not stripped

Not really sure what is wrong. Also the Python scripts seem to work, at least resynthesizer2 does.

[jluttine]

For me, resynthesizer runs but it doesn't produce correct results: bootchk/resynthesizer#63

[stale]

Thank you for your contributions.

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[jluttine]

Still important to me. This is the current console output:

GIMP-Warning: Bad interpreter referenced in interpreter file /nix/store/5c91dah385gn70blsn6i5rzncqj3ks0y-gimp-with-plugins-2.10.18/lib/gimp/2.0/interpreters/pygimp.interp: python2

GIMP-Warning: Bad binary format string in interpreter file /nix/store/5c91dah385gn70blsn6i5rzncqj3ks0y-gimp-with-plugins-2.10.18/lib/gimp/2.0/interpreters/pygimp.interp

Traceback (most recent call last):
  File "/nix/store/3hsppxikcvwhwq1z3bjfjkmjxv97qy91-gimp-2.10.18/lib/gimp/2.0/plug-ins/spyro_plus/.spyro_plus.py-wrapped", line 23, in <module>
    import gimpui
  File "/nix/store/5c91dah385gn70blsn6i5rzncqj3ks0y-gimp-with-plugins-2.10.18/lib/gimp/2.0/python/gimpui.py", line 33, in <module>
    import gtk, gobject, gimp, gimpcolor
ImportError: No module named gtk
/nix/store/5c91dah385gn70blsn6i5rzncqj3ks0y-gimp-with-plugins-2.10.18/bin/.gimp-2.10-wrapped_: LibGimpBase-WARNING: .gimp-2.10-wrapped_: gimp_wire_read(): error
Plug-in "script-fu"
(/nix/store/5c91dah385gn70blsn6i5rzncqj3ks0y-gimp-with-plugins-2.10.18/lib/gimp/2.0/plug-ins/script-fu/script-fu) is installing procedure "script-fu-anim-lightning" with a full menu path "<Toolbox>/Xtns/Anim/Lightning" as menu label, this deprecated and will be an error in GIMP 3.0
Plug-in "script-fu"
(/nix/store/5c91dah385gn70blsn6i5rzncqj3ks0y-gimp-with-plugins-2.10.18/lib/gimp/2.0/plug-ins/script-fu/script-fu) is installing procedure "script-fu-lightning" with a full menu path "<Toolbox>/Xtns/Patterns/Lightning" as menu label, this deprecated and will be an error in GIMP 3.0

[neirenoir]

I have found this issue can be fixed by installing the python package by yourself (which is weird: it looks like GIMP may be trying to use the python2 command from your $PATH). I have it in my systemPackages and I got past that stage. However, #87883 is still blocking the usage of some plugins.

[jtojnar]

Spent some time in gdb and it looks like the extension mapping from pygimp.interp file only searches python2 in path, not in the mapping described on previous lines and registered in

• pygimp.interp: https://gitlab.gnome.org/GNOME/gimp/-/blob/GIMP_2_10_20/plug-ins/pygimp/Makefile.am#L156-160
• gimp_interpreter_db_add_program: https://gitlab.gnome.org/GNOME/gimp/-/blob/df5b363a9606fb7897b6a288ba24a05517219f54/app/plug-in/gimpinterpreterdb.c#L315
• gimp_interpreter_db_add_extension https://gitlab.gnome.org/GNOME/gimp/-/blob/df5b363a9606fb7897b6a288ba24a05517219f54/app/plug-in/gimpinterpreterdb.c#L394-398

But it looks like the check is only a warning and has no bearing on later execution since at the end of gimp_interpreter_db_load, the programs not matched in PATH are resolved in the program mapping database. The extension is not actually inserted to the database so some other mechanism than extension matching must be involved – perhaps shebangs are applied.

We will still want to hardcode the path to ensure purity.