Describe the bug
On MacOS, nested shebangs/shebangs pointing at scripts are not allowed. When using pkgs.python39.withPackages(...) and installing packages with pip into a sandbox environment, binary executables get a shebang that makes them unable to execute.
To Reproduce
- Create shell.nix, and run nix-shell:
let
pkgs = import <nixpkgs> {};
python = pkgs.python39.withPackages(ps: [ ps.pip ]);
in pkgs.mkShell {
buildInputs = [ python ];
shellHook = ''
export PIP_DISABLE_PIP_VERSION_CHECK=1
export PIP_PREFIX="$(pwd)/_build/pip"
export PYTHONPATH="$PIP_PREFIX/lib/python3.9/site-packages:$PYTHONPATH"
export PATH="$PIP_PREFIX/bin:$PATH"
'';
}
- Install ipython with pip, and try to execute it.
[nix-shell]$ pip install ipython
[nix-shell]$ ipython
/Users/tobias/nix-python-issue/_build/pip/bin/ipython: line 3: import: command not found
/Users/tobias/nix-python-issue/_build/pip/bin/ipython: line 4: import: command not found
from: can't read /var/mail/IPython
/Users/tobias//nix-python-issue/_build/pip/bin/ipython: line 7: syntax error near unexpected token `('
/Users/tobias//nix-python-issue/_build/pip/bin/ipython: line 7: ` sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])'Expected behavior
It should be possible to do $ pip install ipython, followed by $ ipython - and have ipython actually execute successfully.
Observations
The shebang in _build/pip/bin/ipython points to a script, which is not allowed on MacOS (only Linux):
[nix-shell]$ cat $PIP_PREFIX/bin/ipython
#!/nix/store/i46k148mi830riq4wxh49ki8qmq0731k-python3-3.9.2-env/bin/python3.9
# -*- coding: utf-8 -*-
import re
import sys
from IPython import start_ipython
if __name__ == '__main__':
sys.argv[0] = re.sub(r'(-script\.pyw|\.exe)?$', '', sys.argv[0])
sys.exit(start_ipython())If /nix/store/i46k148mi830riq4wxh49ki8qmq0731k-python3-3.9.2-env/bin/python3.9 was an executable, everything would be fine. But since this is a script, with its own shebang, this causes issues:
[nix-shell]$ cat /nix/store/i46k148mi830riq4wxh49ki8qmq0731k-python3-3.9.2-env/bin/python3.9
#! /nix/store/ra8yvijdfjcs5f66b99gdjn86gparrbz-bash-4.4-p23/bin/bash -e
export NIX_PYTHONPREFIX='/nix/store/i46k148mi830riq4wxh49ki8qmq0731k-python3-3.9.2-env'
export NIX_PYTHONEXECUTABLE='/nix/store/i46k148mi830riq4wxh49ki8qmq0731k-python3-3.9.2-env/bin/python3.9'
export NIX_PYTHONPATH='/nix/store/i46k148mi830riq4wxh49ki8qmq0731k-python3-3.9.2-env/lib/python3.9/site-packages'
export PYTHONNOUSERSITE='true'
exec "/nix/store/7pjbbmnrch7frgyp7gz19ay0z1173c7y-python3-3.9.2/bin/python3.9" "$@"
Metadata
- system:
"x86_64-darwin"
- host os:
Darwin 20.3.0, macOS 10.16
- multi-user?:
no
- sandbox:
no
- version:
nix-env (Nix) 2.3.10
- channels(tobias):
"darwin, nixpkgs-21.05pre284563.ab6943a7450"
- nixpkgs:
/Users/tobias/.nix-defexpr/channels/nixpkgs
Describe the bug
On MacOS, nested shebangs/shebangs pointing at scripts are not allowed. When using
pkgs.python39.withPackages(...)and installing packages with pip into a sandbox environment, binary executables get a shebang that makes them unable to execute.To Reproduce
Expected behavior
It should be possible to do
$ pip install ipython, followed by$ ipython- and have ipython actually execute successfully.Observations
The shebang in _build/pip/bin/ipython points to a script, which is not allowed on MacOS (only Linux):
[nix-shell]$ cat $PIP_PREFIX/bin/ipythonIf
/nix/store/i46k148mi830riq4wxh49ki8qmq0731k-python3-3.9.2-env/bin/python3.9was an executable, everything would be fine. But since this is a script, with its own shebang, this causes issues:Metadata
"x86_64-darwin"Darwin 20.3.0, macOS 10.16nononix-env (Nix) 2.3.10"darwin, nixpkgs-21.05pre284563.ab6943a7450"/Users/tobias/.nix-defexpr/channels/nixpkgs