forked from mirrors/nixpkgs
f665828fa3
This changeset allows for cross-compilation of Python packages. Packages built with buildPythonPackage are not allowed to refer to the build machine. Executables that have shebangs will refer to the host.
53 lines
1.9 KiB
Nix
53 lines
1.9 KiB
Nix
{ lib
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, python
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, makeSetupHook
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, makeWrapper }:
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with lib;
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makeSetupHook {
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deps = makeWrapper;
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substitutions.sitePackages = python.sitePackages;
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substitutions.executable = python.interpreter;
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substitutions.python = python.pythonForBuild;
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substitutions.pythonHost = python;
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substitutions.magicalSedExpression = let
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# Looks weird? Of course, it's between single quoted shell strings.
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# NOTE: Order DOES matter here, so single character quotes need to be
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# at the last position.
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quoteVariants = [ "'\"'''\"'" "\"\"\"" "\"" "'\"'\"'" ]; # hey Vim: ''
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mkStringSkipper = labelNum: quote: let
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label = "q${toString labelNum}";
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isSingle = elem quote [ "\"" "'\"'\"'" ];
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endQuote = if isSingle then "[^\\\\]${quote}" else quote;
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in ''
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/^[a-z]?${quote}/ {
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/${quote}${quote}|${quote}.*${endQuote}/{n;br}
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:${label}; n; /^${quote}/{n;br}; /${endQuote}/{n;br}; b${label}
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}
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'';
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# This preamble does two things:
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# * Sets argv[0] to the original application's name; otherwise it would be .foo-wrapped.
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# Python doesn't support `exec -a`.
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# * Adds all required libraries to sys.path via `site.addsitedir`. It also handles *.pth files.
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preamble = ''
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import sys
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import site
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import functools
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sys.argv[0] = '"'$(readlink -f "$f")'"'
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functools.reduce(lambda k, p: site.addsitedir(p, k), ['"$([ -n "$program_PYTHONPATH" ] && (echo "'$program_PYTHONPATH'" | sed "s|:|','|g") || true)"'], site._init_pathinfo())
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'';
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in ''
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1 {
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:r
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/\\$|,$/{N;br}
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/__future__|^ |^ *(#.*)?$/{n;br}
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${concatImapStrings mkStringSkipper quoteVariants}
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/^[^# ]/i ${replaceStrings ["\n"] [";"] preamble}
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}
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'';
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} ./wrap.sh
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