Application is not able to load libz.1.dylib

Question

Created May ’22

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I have created a test app using python3.9.12 version and pyinstaller version 5.0.1. The .pkg is getting created successfully but during runtime getting the below error:

ImportError: dlopen(/Applications/TestApp/Contents/MacOS/lib-dynload/binascii.cpython-39-darwin.so, 2): Library not loaded: /opt/local/lib/libz.1.dylib

Referenced from: /Applications/TestApp/Contents/MacOS/lib-dynload/binascii.cpython-39-darwin.so

Reason: no suitable image found. Did find: /opt/local/lib/libz.1.dylib: code signature in (/opt/local/lib/libz.1.dylib) not valid for use in process using Library Validation: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed.

I have tried disabling library validation, it dint work for me. are there any solution available for this?

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Answer 1

DTS Engineer OP

Apple

May ’22

It sounds like your main app has the hardened runtime enabled, which makes it tricky for it to load unsigned code. The best way to fix this depends on your deployment goals. You wrote:

The .pkg is getting created successfully

How far to intend to deploy this? If you want to deploy it widely, the best path forward is to:

Leave the hardened runtime enabled
Embed a copy of any libraries you depend on within your app, signing them as your code
Alternatively, if the case of libz, use the one built-in to macOS

This setup allows you to leave the hardened runtime fully enabled; you don’t even need to disable library validation.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

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Answer 2

sinkcup OP

Nov ’23

download code of zlib
compile
copy the dylib to the path where you need

cd ~/Downloads/zlib-1.3
./configure
make
ls -la *.dylib
cp libz.1.3.dylib /opt/local/lib/libz.1.dylib

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