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"""Repository rule for Python autoconfiguration.
"""
load(
"//third_party/remote_config:common.bzl",
"BAZEL_SH",
"PYTHON_BIN_PATH",
"PYTHON_LIB_PATH",
)
def _create_local_python_repository(repository_ctx):
"""Creates the repository containing files set up to build with Python."""
# Resolve all labels before doing any real work. Resolving causes the
# function to be restarted with all previous state being lost. This
# can easily lead to a O(n^2) runtime in the number of labels.
build_tpl = repository_ctx.path(Label("//third_party/py:BUILD.tpl"))
platform_constraint = ""
if repository_ctx.attr.platform_constraint:
platform_constraint = "\"%s\"" % repository_ctx.attr.platform_constraint
repository_ctx.template("BUILD", build_tpl, {"%{PLATFORM_CONSTRAINT}": platform_constraint})
def _python_autoconf_impl(repository_ctx):
"""Implementation of the python_autoconf repository rule."""
_create_local_python_repository(repository_ctx)
_ENVIRONS = [
BAZEL_SH,
PYTHON_BIN_PATH,
PYTHON_LIB_PATH,
]
local_python_configure = repository_rule(
implementation = _create_local_python_repository,
attrs = {
"environ": attr.string_dict(),
"platform_constraint": attr.string(),
},
)
remote_python_configure = repository_rule(
implementation = _create_local_python_repository,
environ = _ENVIRONS,
remotable = True,
attrs = {
"environ": attr.string_dict(),
"platform_constraint": attr.string(),
},
)
python_configure = repository_rule(
implementation = _python_autoconf_impl,
attrs = {
"platform_constraint": attr.string(),
},
)
"""Detects and configures the local Python.
Add the following to your WORKSPACE FILE:
```python
python_configure(name = "local_config_python")
```
Args:
name: A unique name for this workspace rule.
"""
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