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# Copyright 2018 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.
"""Utils for manipulating external repositories, once fetched.
### Setup
These utility are intended to be used by other repository rules. They
can be loaded as follows.
```python
load(
"@bazel_tools//tools/build_defs/repo:utils.bzl",
"workspace_and_buildfile",
)
```
"""
def workspace_and_buildfile(ctx):
"""Utility function for writing WORKSPACE and, if requested, a BUILD file.
It assumes the parameters name, build_file, build_file_contents,
workspace_file, and workspace_file_content to be
present in ctx.attr, the latter four possibly with value None.
Args:
ctx: The repository context of the repository rule calling this utility
function.
"""
if ctx.attr.build_file and ctx.attr.build_file_content:
ctx.fail("Only one of build_file and build_file_content can be provided.")
if ctx.attr.workspace_file and ctx.attr.workspace_file_content:
ctx.fail("Only one of workspace_file and workspace_file_content can be provided.")
if ctx.attr.workspace_file:
bash_exe = ctx.os.environ["BAZEL_SH"] if "BAZEL_SH" in ctx.os.environ else "bash"
ctx.execute([bash_exe, "-c", "rm -f WORKSPACE"])
ctx.symlink(ctx.attr.workspace_file, "WORKSPACE")
elif ctx.attr.workspace_file_content:
bash_exe = ctx.os.environ["BAZEL_SH"] if "BAZEL_SH" in ctx.os.environ else "bash"
ctx.execute([bash_exe, "-c", "rm -f WORKSPACE"])
ctx.file("WORKSPACE", ctx.attr.workspace_file_content)
else:
ctx.file("WORKSPACE", "workspace(name = \"{name}\")\n".format(name = ctx.name))
if ctx.attr.build_file:
bash_exe = ctx.os.environ["BAZEL_SH"] if "BAZEL_SH" in ctx.os.environ else "bash"
ctx.execute([bash_exe, "-c", "rm -f BUILD BUILD.bazel"])
ctx.symlink(ctx.attr.build_file, "BUILD.bazel")
elif ctx.attr.build_file_content:
bash_exe = ctx.os.environ["BAZEL_SH"] if "BAZEL_SH" in ctx.os.environ else "bash"
ctx.execute([bash_exe, "-c", "rm -f BUILD.bazel"])
ctx.file("BUILD.bazel", ctx.attr.build_file_content)
def patch(ctx):
"""Implementation of patching an already extracted repository"""
bash_exe = ctx.os.environ["BAZEL_SH"] if "BAZEL_SH" in ctx.os.environ else "bash"
for patchfile in ctx.attr.patches:
command = "{patchtool} {patch_args} < {patchfile}".format(
patchtool = ctx.attr.patch_tool,
patchfile = ctx.path(patchfile),
patch_args = " ".join([
"'%s'" % arg
for arg in ctx.attr.patch_args
]),
)
st = ctx.execute([bash_exe, "-c", command])
if st.return_code:
fail("Error applying patch %s:\n%s%s" %
(str(patchfile), st.stderr, st.stdout))
for cmd in ctx.attr.patch_cmds:
st = ctx.execute([bash_exe, "-c", cmd])
if st.return_code:
fail("Error applying patch command %s:\n%s%s" %
(cmd, st.stdout, st.stderr))
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