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https://github.com/NixOS/nixpkgs.git
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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.
129 lines
4.8 KiB
Bash
129 lines
4.8 KiB
Bash
# Wrapper around wrapPythonProgramsIn, below. The $pythonPath
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# variable is passed in from the buildPythonPackage function.
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wrapPythonPrograms() {
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wrapPythonProgramsIn "$out/bin" "$out $pythonPath"
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}
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# Builds environment variables like PYTHONPATH and PATH walking through closure
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# of dependencies.
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buildPythonPath() {
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local pythonPath="$1"
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local path
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# Create an empty table of python paths (see doc on _addToPythonPath
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# for how this is used). Build up the program_PATH and program_PYTHONPATH
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# variables.
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declare -A pythonPathsSeen=()
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program_PYTHONPATH=
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program_PATH=
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pythonPathsSeen["@pythonHost@"]=1
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addToSearchPath program_PATH @pythonHost@/bin
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for path in $pythonPath; do
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_addToPythonPath $path
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done
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}
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# Patches a Python script so that it has correct libraries path and executable
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# name.
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patchPythonScript() {
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local f="$1"
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# The magicalSedExpression will invoke a "$(basename "$f")", so
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# if you change $f to something else, be sure to also change it
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# in pkgs/top-level/python-packages.nix!
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# It also uses $program_PYTHONPATH.
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sed -i "$f" -re '@magicalSedExpression@'
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}
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# Transforms any binaries generated by the setup.py script, replacing them
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# with an executable shell script which will set some environment variables
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# and then call into the original binary (which has been given a .wrapped
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# suffix).
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wrapPythonProgramsIn() {
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local dir="$1"
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local pythonPath="$2"
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local f
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buildPythonPath "$pythonPath"
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# Find all regular files in the output directory that are executable.
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if [ -d "$dir" ]; then
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find "$dir" -type f -perm -0100 -print0 | while read -d "" f; do
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# Rewrite "#! .../env python" to "#! /nix/store/.../python".
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# Strip suffix, like "3" or "2.7m" -- we don't have any choice on which
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# Python to use besides one with this hook anyway.
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if head -n1 "$f" | grep -q '#!.*/env.*\(python\|pypy\)'; then
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sed -i "$f" -e "1 s^.*/env[ ]*\(python\|pypy\)[^ ]*^#!@executable@^"
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fi
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if head -n1 "$f" | grep -q '#!.*'; then
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# Cross-compilation hack: ensure shebangs are for the host
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echo "Rewriting $(head -n 1 $f) to #!@pythonHost@"
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sed -i "$f" -e "1 s^#!@python@^#!@pythonHost@^"
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fi
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# catch /python and /.python-wrapped
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if head -n1 "$f" | grep -q '/\.\?\(python\|pypy\)'; then
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# dont wrap EGG-INFO scripts since they are called from python
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if echo "$f" | grep -qv EGG-INFO/scripts; then
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echo "wrapping \`$f'..."
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patchPythonScript "$f"
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# wrapProgram creates the executable shell script described
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# above. The script will set PYTHONPATH and PATH variables.!
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# (see pkgs/build-support/setup-hooks/make-wrapper.sh)
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local -a wrap_args=("$f"
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--prefix PATH ':' "$program_PATH"
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--set PYTHONNOUSERSITE "true"
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)
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# Add any additional arguments provided by makeWrapperArgs
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# argument to buildPythonPackage.
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local -a user_args="($makeWrapperArgs)"
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local -a wrapProgramArgs=("${wrap_args[@]}" "${user_args[@]}")
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wrapProgram "${wrapProgramArgs[@]}"
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fi
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fi
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done
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fi
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}
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# Adds the lib and bin directories to the PYTHONPATH and PATH variables,
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# respectively. Recurses on any paths declared in
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# `propagated-build-inputs`, while avoiding duplicating paths by
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# flagging the directories it has visited in `pythonPathsSeen`.
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_addToPythonPath() {
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local dir="$1"
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# Stop if we've already visited here.
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if [ -n "${pythonPathsSeen[$dir]}" ]; then return; fi
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pythonPathsSeen[$dir]=1
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# addToSearchPath is defined in stdenv/generic/setup.sh. It will have
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# the effect of calling `export program_X=$dir/...:$program_X`.
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addToSearchPath program_PYTHONPATH $dir/@sitePackages@
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addToSearchPath program_PATH $dir/bin
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# Inspect the propagated inputs (if they exist) and recur on them.
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local prop="$dir/nix-support/propagated-build-inputs"
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if [ -e $prop ]; then
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local new_path
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for new_path in $(cat $prop); do
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_addToPythonPath $new_path
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done
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fi
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}
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createBuildInputsPth() {
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local category="$1"
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local inputs="$2"
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if [ foo"$inputs" != foo ]; then
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for x in $inputs; do
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if $(echo -n $x |grep -q python-recursive-pth-loader); then
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continue
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fi
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if test -d "$x"/@sitePackages@; then
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echo $x/@sitePackages@ \
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>> "$out"/@sitePackages@/${name}-nix-python-$category.pth
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fi
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done
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fi
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}
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