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[bazel] Introduce a "py_import" rule, analogous to "java_import"
This allows us to use wheels and other tar.gz third party libraries in our python code. This will prove useful.
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load("//py:import.bzl", _py_import = "py_import") | ||
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py_import = _py_import |
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def _py_import_impl(ctx): | ||
# Unpack the file somewhere, and present as a python library. We need to | ||
# know all the files in the zip, and that's problematic. For now, we might | ||
# be able to get away with just creating and declaring the directory. | ||
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root = ctx.actions.declare_directory("%s-pyroot" % ctx.attr.name) | ||
args = ctx.actions.args() | ||
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if ctx.file.wheel.path.endswith(".zip") or ctx.file.wheel.path.endswith(".whl"): | ||
args.add("x") | ||
args.add(ctx.file.wheel.path) | ||
args.add_all(["-d", root.path]) | ||
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ctx.actions.run( | ||
outputs = [root], | ||
inputs = [ctx.file.wheel], | ||
arguments = [args], | ||
executable = ctx.executable._zip, | ||
) | ||
elif ctx.file.wheel.path.endswith(".tar.gz"): | ||
args.add(ctx.file.wheel.path) | ||
args.add(root.path) | ||
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ctx.actions.run( | ||
outputs = [root], | ||
inputs = [ctx.file.wheel], | ||
arguments = [args], | ||
executable = ctx.executable._untar, | ||
) | ||
else: | ||
fail("Unrecognised file extension: %s" % ctx.attr.wheel) | ||
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runfiles = ctx.runfiles(files = [root]) | ||
for dep in ctx.attr.deps: | ||
runfiles = runfiles.merge(dep[DefaultInfo].default_runfiles) | ||
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imports = depset( | ||
items = [ | ||
"%s/%s/%s-pyroot" % (ctx.workspace_name, ctx.label.package, ctx.label.name), | ||
], | ||
transitive = [dep[PyInfo].imports for dep in ctx.attr.deps], | ||
) | ||
transitive_sources = depset( | ||
items = [], | ||
transitive = [dep[PyInfo].transitive_sources for dep in ctx.attr.deps], | ||
) | ||
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py_srcs = ctx.attr.srcs_version | ||
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info = PyInfo( | ||
imports = imports, | ||
has_py2_only_sources = py_srcs == "PY2", | ||
has_py3_only_sources = py_srcs == "PY3", | ||
transitive_sources = transitive_sources, | ||
uses_shared_libraries = not ctx.attr.zip_safe, | ||
) | ||
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return [ | ||
DefaultInfo( | ||
files = depset(items = [root]), | ||
default_runfiles = runfiles, | ||
), | ||
info, | ||
] | ||
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py_import = rule( | ||
_py_import_impl, | ||
attrs = { | ||
"wheel": attr.label( | ||
allow_single_file = True, | ||
mandatory = True, | ||
), | ||
"zip_safe": attr.bool( | ||
default = True, | ||
), | ||
"python_version": attr.string( | ||
default = "PY3", | ||
values = ["PY2", "PY3"], | ||
), | ||
"srcs_version": attr.string( | ||
default = "PY2AND3", | ||
values = ["PY2", "PY3", "PY2AND3"], | ||
), | ||
"deps": attr.label_list( | ||
allow_empty = True, | ||
providers = [PyInfo], | ||
), | ||
"_zip": attr.label( | ||
allow_single_file = True, | ||
cfg = "host", | ||
default = "@bazel_tools//tools/zip:zipper", | ||
executable = True, | ||
), | ||
"_untar": attr.label( | ||
cfg = "exec", | ||
default = "//py:untar", | ||
executable = True, | ||
), | ||
}, | ||
) |
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import os | ||
import sys | ||
import tarfile | ||
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if __name__ == '__main__': | ||
outdir = sys.argv[2] | ||
if not os.path.exists(outdir): | ||
os.makedirs(outdir) | ||
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tar = tarfile.open(sys.argv[1]) | ||
for member in tar.getmembers(): | ||
parts = member.name.split("/") | ||
parts.pop(0) | ||
if not len(parts): | ||
continue | ||
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basepath = os.path.join(*parts) | ||
basepath = os.path.normpath(basepath) | ||
member.name = basepath | ||
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dir = os.path.join(outdir, os.path.dirname(basepath)) | ||
if not os.path.exists(dir): | ||
os.makedirs(dir) | ||
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tar.extract(member, outdir) | ||
tar.close() |