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# Copyright 2015 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.
"""Rules for cloning external git repositories."""
def _clone_or_update(ctx):
if ((ctx.attr.tag == "" and ctx.attr.commit == "") or
(ctx.attr.tag != "" and ctx.attr.commit != "")):
ctx.fail("Exactly one of commit and tag must be provided")
if ctx.attr.commit != "":
ref = ctx.attr.commit
else:
ref = "tags/" + ctx.attr.tag
st = ctx.execute(["bash", '-c', """
set -ex
( cd {working_dir} &&
if ! ( cd '{dir}' && git rev-parse --git-dir ) >/dev/null 2>&1; then
rm -rf '{dir}'
git clone '{remote}' '{dir}'
fi
cd '{dir}'
git reset --hard {ref} || (git fetch && git reset --hard {ref})
git clean -xdf )
""".format(
working_dir=ctx.path(".").dirname,
dir=ctx.path("."),
remote=ctx.attr.remote,
ref=ref,
)])
if st.return_code != 0:
fail("error cloning %s:\n%s" % (ctx.name, st.stderr))
if ctx.attr.init_submodules:
st = ctx.execute(["bash", '-c', """
set -ex
( cd '{dir}'
git submodule update --init --checkout --force )
""".format(
dir=ctx.path("."),
)])
if st.return_code != 0:
fail("error updating submodules %s:\n%s" % (ctx.name, st.stderr))
def _new_git_repository_implementation(ctx):
if ((ctx.attr.build_file == None and ctx.attr.build_file_content == '') or
(ctx.attr.build_file != None and ctx.attr.build_file_content != '')):
ctx.fail("Exactly one of build_file and build_file_content must be provided.")
_clone_or_update(ctx)
ctx.file('WORKSPACE', "workspace(name = \"{name}\")\n".format(name=ctx.name))
if ctx.attr.build_file:
ctx.symlink(ctx.attr.build_file, 'BUILD')
else:
ctx.file('BUILD', ctx.attr.build_file_content)
def _git_repository_implementation(ctx):
_clone_or_update(ctx)
_common_attrs = {
"remote": attr.string(mandatory=True),
"commit": attr.string(default=""),
"tag": attr.string(default=""),
"init_submodules": attr.bool(default=False),
}
new_git_repository = repository_rule(
implementation=_new_git_repository_implementation,
attrs=_common_attrs + {
"build_file": attr.label(),
"build_file_content": attr.string(),
}
)
"""Clone an external git repository.
Clones a Git repository, checks out the specified tag, or commit, and
makes its targets available for binding.
Args:
name: A unique name for this rule.
build_file: The file to use as the BUILD file for this repository.
Either build_file or build_file_content must be specified.
This attribute is a label relative to the main workspace. The file
does not need to be named BUILD, but can be (something like
BUILD.new-repo-name may work well for distinguishing it from the
repository's actual BUILD files.
build_file_content: The content for the BUILD file for this repository.
Either build_file or build_file_content must be specified.
init_submodules: Whether to clone submodules in the repository.
remote: The URI of the remote Git repository.
"""
git_repository = repository_rule(
implementation=_git_repository_implementation,
attrs=_common_attrs,
)
"""Clone an external git repository.
Clones a Git repository, checks out the specified tag, or commit, and
makes its targets available for binding.
Args:
name: A unique name for this rule.
init_submodules: Whether to clone submodules in the repository.
remote: The URI of the remote Git repository.
"""
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