306 lines
12 KiB
Python
306 lines
12 KiB
Python
# Adapted with modifications from tensorflow/third_party/py/
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"""Repository rule for Python autoconfiguration.
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`python_configure` depends on the following environment variables:
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* `PYTHON_BIN_PATH`: location of python binary.
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* `PYTHON_LIB_PATH`: Location of python libraries.
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"""
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_BAZEL_SH = "BAZEL_SH"
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_PYTHON_BIN_PATH = "PYTHON_BIN_PATH"
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_PYTHON_LIB_PATH = "PYTHON_LIB_PATH"
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_PYTHON_CONFIG_REPO = "PYTHON_CONFIG_REPO"
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def _tpl(repository_ctx, tpl, substitutions={}, out=None):
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if not out:
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out = tpl
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repository_ctx.template(out, Label("//third_party/py:%s.tpl" % tpl),
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substitutions)
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def _fail(msg):
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"""Output failure message when auto configuration fails."""
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red = "\033[0;31m"
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no_color = "\033[0m"
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fail("%sPython Configuration Error:%s %s\n" % (red, no_color, msg))
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def _is_windows(repository_ctx):
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"""Returns true if the host operating system is windows."""
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os_name = repository_ctx.os.name.lower()
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return os_name.find("windows") != -1
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def _execute(repository_ctx,
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cmdline,
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error_msg=None,
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error_details=None,
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empty_stdout_fine=False):
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"""Executes an arbitrary shell command.
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Args:
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repository_ctx: the repository_ctx object
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cmdline: list of strings, the command to execute
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error_msg: string, a summary of the error if the command fails
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error_details: string, details about the error or steps to fix it
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empty_stdout_fine: bool, if True, an empty stdout result is fine, otherwise
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it's an error
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Return:
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the result of repository_ctx.execute(cmdline)
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"""
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result = repository_ctx.execute(cmdline)
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if result.stderr or not (empty_stdout_fine or result.stdout):
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_fail("\n".join([
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error_msg.strip() if error_msg else "Repository command failed",
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result.stderr.strip(), error_details if error_details else ""
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]))
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else:
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return result
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def _read_dir(repository_ctx, src_dir):
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"""Returns a string with all files in a directory.
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Finds all files inside a directory, traversing subfolders and following
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symlinks. The returned string contains the full path of all files
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separated by line breaks.
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"""
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if _is_windows(repository_ctx):
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src_dir = src_dir.replace("/", "\\")
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find_result = _execute(
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repository_ctx,
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["cmd.exe", "/c", "dir", src_dir, "/b", "/s", "/a-d"],
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empty_stdout_fine=True)
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# src_files will be used in genrule.outs where the paths must
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# use forward slashes.
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return find_result.stdout.replace("\\", "/")
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else:
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find_result = _execute(
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repository_ctx, ["find", src_dir, "-follow", "-type", "f"],
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empty_stdout_fine=True)
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return find_result.stdout
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def _genrule(src_dir, genrule_name, command, outs):
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"""Returns a string with a genrule.
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Genrule executes the given command and produces the given outputs.
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"""
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return ('genrule(\n' + ' name = "' + genrule_name + '",\n' +
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' outs = [\n' + outs + '\n ],\n' + ' cmd = """\n' +
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command + '\n """,\n' + ')\n')
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def _normalize_path(path):
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"""Returns a path with '/' and remove the trailing slash."""
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path = path.replace("\\", "/")
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if path[-1] == "/":
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path = path[:-1]
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return path
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def _symlink_genrule_for_dir(repository_ctx,
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src_dir,
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dest_dir,
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genrule_name,
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src_files=[],
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dest_files=[]):
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"""Returns a genrule to symlink(or copy if on Windows) a set of files.
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If src_dir is passed, files will be read from the given directory; otherwise
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we assume files are in src_files and dest_files
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"""
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if src_dir != None:
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src_dir = _normalize_path(src_dir)
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dest_dir = _normalize_path(dest_dir)
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files = '\n'.join(
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sorted(_read_dir(repository_ctx, src_dir).splitlines()))
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# Create a list with the src_dir stripped to use for outputs.
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dest_files = files.replace(src_dir, '').splitlines()
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src_files = files.splitlines()
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command = []
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outs = []
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for i in range(len(dest_files)):
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if dest_files[i] != "":
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# If we have only one file to link we do not want to use the dest_dir, as
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# $(@D) will include the full path to the file.
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dest = '$(@D)/' + dest_dir + dest_files[i] if len(
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dest_files) != 1 else '$(@D)/' + dest_files[i]
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# On Windows, symlink is not supported, so we just copy all the files.
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cmd = 'cp -f' if _is_windows(repository_ctx) else 'ln -s'
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command.append(cmd + ' "%s" "%s"' % (src_files[i], dest))
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outs.append(' "' + dest_dir + dest_files[i] + '",')
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return _genrule(src_dir, genrule_name, " && ".join(command),
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"\n".join(outs))
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def _get_python_bin(repository_ctx):
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"""Gets the python bin path."""
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python_bin = repository_ctx.os.environ.get(_PYTHON_BIN_PATH)
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if python_bin != None:
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return python_bin
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python_bin_path = repository_ctx.which("python")
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if python_bin_path != None:
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return str(python_bin_path)
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_fail("Cannot find python in PATH, please make sure " +
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"python is installed and add its directory in PATH, or --define " +
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"%s='/something/else'.\nPATH=%s" %
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(_PYTHON_BIN_PATH, repository_ctx.os.environ.get("PATH", "")))
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def _get_bash_bin(repository_ctx):
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"""Gets the bash bin path."""
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bash_bin = repository_ctx.os.environ.get(_BAZEL_SH)
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if bash_bin != None:
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return bash_bin
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else:
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bash_bin_path = repository_ctx.which("bash")
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if bash_bin_path != None:
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return str(bash_bin_path)
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else:
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_fail(
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"Cannot find bash in PATH, please make sure " +
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"bash is installed and add its directory in PATH, or --define "
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+ "%s='/path/to/bash'.\nPATH=%s" %
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(_BAZEL_SH, repository_ctx.os.environ.get("PATH", "")))
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def _get_python_lib(repository_ctx, python_bin):
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"""Gets the python lib path."""
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python_lib = repository_ctx.os.environ.get(_PYTHON_LIB_PATH)
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if python_lib != None:
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return python_lib
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print_lib = (
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"<<END\n" + "from __future__ import print_function\n" +
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"import site\n" + "import os\n" + "\n" + "try:\n" +
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" input = raw_input\n" + "except NameError:\n" + " pass\n" + "\n" +
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"python_paths = []\n" + "if os.getenv('PYTHONPATH') is not None:\n" +
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" python_paths = os.getenv('PYTHONPATH').split(':')\n" + "try:\n" +
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" library_paths = site.getsitepackages()\n" +
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"except AttributeError:\n" +
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" from distutils.sysconfig import get_python_lib\n" +
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" library_paths = [get_python_lib()]\n" +
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"all_paths = set(python_paths + library_paths)\n" + "paths = []\n" +
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"for path in all_paths:\n" + " if os.path.isdir(path):\n" +
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" paths.append(path)\n" + "if len(paths) >=1:\n" +
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" print(paths[0])\n" + "END")
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cmd = '%s - %s' % (python_bin, print_lib)
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result = repository_ctx.execute([_get_bash_bin(repository_ctx), "-c", cmd])
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return result.stdout.strip('\n')
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def _check_python_lib(repository_ctx, python_lib):
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"""Checks the python lib path."""
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cmd = 'test -d "%s" -a -x "%s"' % (python_lib, python_lib)
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result = repository_ctx.execute([_get_bash_bin(repository_ctx), "-c", cmd])
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if result.return_code == 1:
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_fail("Invalid python library path: %s" % python_lib)
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def _check_python_bin(repository_ctx, python_bin):
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"""Checks the python bin path."""
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cmd = '[[ -x "%s" ]] && [[ ! -d "%s" ]]' % (python_bin, python_bin)
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result = repository_ctx.execute([_get_bash_bin(repository_ctx), "-c", cmd])
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if result.return_code == 1:
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_fail("--define %s='%s' is not executable. Is it the python binary?" %
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(_PYTHON_BIN_PATH, python_bin))
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def _get_python_include(repository_ctx, python_bin):
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"""Gets the python include path."""
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result = _execute(
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repository_ctx, [
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python_bin, "-c", 'from __future__ import print_function;' +
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'from distutils import sysconfig;' +
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'print(sysconfig.get_python_inc())'
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],
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error_msg="Problem getting python include path.",
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error_details=(
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"Is the Python binary path set up right? " + "(See ./configure or "
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+ _PYTHON_BIN_PATH + ".) " + "Is distutils installed?"))
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return result.stdout.splitlines()[0]
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def _get_python_import_lib_name(repository_ctx, python_bin):
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"""Get Python import library name (pythonXY.lib) on Windows."""
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result = _execute(
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repository_ctx, [
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python_bin, "-c",
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'import sys;' + 'print("python" + str(sys.version_info[0]) + ' +
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' str(sys.version_info[1]) + ".lib")'
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],
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error_msg="Problem getting python import library.",
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error_details=("Is the Python binary path set up right? " +
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"(See ./configure or " + _PYTHON_BIN_PATH + ".) "))
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return result.stdout.splitlines()[0]
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def _create_local_python_repository(repository_ctx):
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"""Creates the repository containing files set up to build with Python."""
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python_bin = _get_python_bin(repository_ctx)
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_check_python_bin(repository_ctx, python_bin)
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python_lib = _get_python_lib(repository_ctx, python_bin)
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_check_python_lib(repository_ctx, python_lib)
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python_include = _get_python_include(repository_ctx, python_bin)
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python_include_rule = _symlink_genrule_for_dir(
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repository_ctx, python_include, 'python_include', 'python_include')
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python_import_lib_genrule = ""
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# To build Python C/C++ extension on Windows, we need to link to python import library pythonXY.lib
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# See https://docs.python.org/3/extending/windows.html
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if _is_windows(repository_ctx):
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python_include = _normalize_path(python_include)
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python_import_lib_name = _get_python_import_lib_name(
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repository_ctx, python_bin)
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python_import_lib_src = python_include.rsplit(
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'/', 1)[0] + "/libs/" + python_import_lib_name
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python_import_lib_genrule = _symlink_genrule_for_dir(
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repository_ctx, None, '', 'python_import_lib',
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[python_import_lib_src], [python_import_lib_name])
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_tpl(
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repository_ctx, "BUILD", {
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"%{PYTHON_INCLUDE_GENRULE}": python_include_rule,
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"%{PYTHON_IMPORT_LIB_GENRULE}": python_import_lib_genrule,
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})
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def _create_remote_python_repository(repository_ctx, remote_config_repo):
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"""Creates pointers to a remotely configured repo set up to build with Python.
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"""
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_tpl(repository_ctx, "remote.BUILD", {
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"%{REMOTE_PYTHON_REPO}": remote_config_repo,
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}, "BUILD")
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def _python_autoconf_impl(repository_ctx):
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"""Implementation of the python_autoconf repository rule."""
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if _PYTHON_CONFIG_REPO in repository_ctx.os.environ:
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_create_remote_python_repository(
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repository_ctx, repository_ctx.os.environ[_PYTHON_CONFIG_REPO])
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else:
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_create_local_python_repository(repository_ctx)
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python_configure = repository_rule(
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implementation=_python_autoconf_impl,
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environ=[
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_BAZEL_SH,
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_PYTHON_BIN_PATH,
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_PYTHON_LIB_PATH,
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_PYTHON_CONFIG_REPO,
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],
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)
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"""Detects and configures the local Python.
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Add the following to your WORKSPACE FILE:
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```python
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python_configure(name = "local_config_python")
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```
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Args:
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name: A unique name for this workspace rule.
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"""
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