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# Copyright 2016 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Helper functions that don't depend on Skylark, so can be unit tested."""
def safe_short_path(file_):
"""Like `File.short_path` but safe for use with files from external repositories.
"""
# Note: "F" is "File", "FO": is "File.owner". (Lifted from genpkg.bzl.)
# | File type | Repo | `F.path` | `F.root.path` | `F.short_path` | `FO.workspace_name` | `FO.workspace_root` |
# |-----------|----------|----------------------------------------------------------|------------------------------|-------------------------|---------------------|---------------------|
# | Source | Local | `dirA/fooA` | | `dirA/fooA` | | |
# | Generated | Local | `bazel-out/k8-fastbuild/bin/dirA/gen.out` | `bazel-out/k8-fastbuild/bin` | `dirA/gen.out` | | |
# | Source | External | `external/repo2/dirA/fooA` | | `../repo2/dirA/fooA` | `repo2` | `external/repo2` |
# | Generated | External | `bazel-out/k8-fastbuild/bin/external/repo2/dirA/gen.out` | `bazel-out/k8-fastbuild/bin` | `../repo2/dirA/gen.out` | `repo2` | `external/repo2` |
# Beginning with `file_.path`, remove optional `F.root.path`.
working_path = file_.path
if not file_.is_source:
working_path = working_path[len(file_.root.path)+1:]
return working_path
def _short_path_dirname(path):
"""Returns the directory's name of the short path of an artifact."""
sp = safe_short_path(path)
last_pkg = sp.rfind("/")
if last_pkg == -1:
# Top-level BUILD file.
return ""
return sp[:last_pkg]
def dest_path(f, strip_prefix, data_path_without_prefix = ""):
"""Returns the short path of f, stripped of strip_prefix."""
f_short_path = safe_short_path(f)
if strip_prefix == None:
# If no strip_prefix was specified, use the package of the
# given input as the strip_prefix.
strip_prefix = _short_path_dirname(f)
if not strip_prefix:
return f_short_path
if f_short_path.startswith(strip_prefix):
# Check that the last directory in strip_prefix is a complete
# directory (so that we don't strip part of a dir name)
prefix_last_dir_index = strip_prefix.rfind("/")
prefix_last_dir = strip_prefix[prefix_last_dir_index + 1:]
# Avoid stripping prefix if final directory is incomplete
if prefix_last_dir not in f_short_path.split("/"):
strip_prefix = data_path_without_prefix
return f_short_path[len(strip_prefix):]
return f_short_path
def compute_data_path(ctx, data_path):
"""Compute the relative data path prefix from the data_path attribute.
Args:
ctx: rule implementation ctx.
data_path: path to a file, relative to the package of the rule ctx.
"""
build_dir = ctx.label.package
if data_path:
# Strip ./ from the beginning if specified.
# There is no way to handle .// correctly (no function that would make
# that possible and Skylark is not turing complete) so just consider it
# as an absolute path.
if len(data_path) >= 2 and data_path[0:2] == "./":
data_path = data_path[2:]
if not data_path or data_path == ".": # Relative to current package
return build_dir
elif data_path[0] == "/": # Absolute path
return data_path[1:]
else: # Relative to a sub-directory
tmp_short_path_dirname = build_dir
if tmp_short_path_dirname:
return tmp_short_path_dirname + "/" + data_path
return data_path
else:
return None
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