Python for Android - Executable

[eakteam]

Hello, i am having difficulties understanding why executing python module is not working.
So the steps are like that :

Edited TERMUX_APP_PACKAGE="com.somepackage" at termux-packages/scripts/properties.sh
Edited termux-packages/scripts/build/termux-step-setup-variables.sh and add thoose 2 lines :
: "${TERMUX_PREFIX:="/data/data/com.somepackage/files/usr"}"
: "${TERMUX_ANDROID_HOME:="/data/data/com.somepackage/files/home"}"

Build python -> ./build-package.sh python

After it is done, get all the folders produced inside .deb file and upload to Android /data/local/tmp because it have execute permission allowed from adb shell to allow testing.

When trying to execute it with ./python3
It fails with : CANNOT LINK EXECUTABLE "./python3": library "libandroid-support.so" not found: needed by main executable

But i am sure that this library is there and existing.

[ghost]

That's because packages aren't standalone. They have dependencies, e.g. libraries such as libc.so, libandroid-support.so and many others. All files must be placed at specific locations which also make packages not relocatable.

Say you have compiled package with prefix /data/data/com.somepackage/files/usr. That means:

• Package installation root would be /data/data/com.somepackage/files/usr.
• Data files will be looked at /data/data/com.somepackage/files/usr/share.
• Libraries will be looked at /data/data/com.somepackage/files/usr/lib.
• Temporary files will be stored at /data/data/com.somepackage/files/usr/tmp.

But you are placing everything into /data/local/tmp. That would not work at least because compiled-in library search path is different. In case of python package you will additional issue where python will be unable to locate its stdlib.

[eakteam]

The second screen is root folder and the first is lib folder... Where i am wrong ?

[eakteam]

And what if i change /data/data/com.somepackage/files/usr to /data/local/tmp ? it should work ?

[eakteam]

Can You help please ?

[ghost]

@eakteam You put only python files in lib directory. Iny previous comments I wrote that you need to put files of every python package dependency and in the last comment I provided a list of dependency packages.

Packages are not standalone. One package depend on other(s) and form dependency chain. So get all Deb files required to run Python and extract them to prefix directory.

If you are going to use ADB, your prefix should be /data/local/tmp and therefore lib path is going to be /data/local/tmp/lib. As paths are hardcoded into binaries, changing prefix will require rebuilding.