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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.verbose):
print('git.bzl: Cloning or updating repository %s using strip_prefix of [%s]' %
(ctx.name, ctx.attr.strip_prefix if ctx.attr.strip_prefix else 'None'))
if ((not ctx.attr.tag and not ctx.attr.commit) or
(ctx.attr.tag and ctx.attr.commit)):
fail('Exactly one of commit and tag must be provided')
if ctx.attr.commit:
ref = ctx.attr.commit
else:
ref = 'tags/' + ctx.attr.tag
directory=str(ctx.path('.'))
if ctx.attr.strip_prefix:
directory = directory + "-tmp"
st = ctx.execute(['bash', '-c', """
set -ex
( cd {working_dir} &&
if ! ( cd '{dir_link}' && [[ "$(git rev-parse --git-dir)" == '.git' ]] ) >/dev/null 2>&1; then
rm -rf '{directory}' '{dir_link}'
git clone --depth=1 '{remote}' '{directory}'
fi
cd '{directory}'
git reset --hard {ref} || (git fetch --depth=1 origin {ref}:{ref} && git reset --hard {ref})
git clean -xdf )
""".format(
working_dir=ctx.path('.').dirname,
dir_link=ctx.path('.'),
directory=directory,
remote=ctx.attr.remote,
ref=ref,
)])
if st.return_code:
fail('error cloning %s:\n%s' % (ctx.name, st.stderr))
if ctx.attr.strip_prefix:
dest_link="{}/{}".format(directory, ctx.attr.strip_prefix)
if not ctx.path(dest_link).exists:
fail("strip_prefix at {} does not exist in repo".format(ctx.attr.strip_prefix))
ctx.symlink(dest_link, ctx.path('.'))
if ctx.attr.init_submodules:
st = ctx.execute(['bash', '-c', """
set -ex
( cd '{directory}'
git submodule update --init --checkout --force )
""".format(
directory=ctx.path('.'),
)])
if st.return_code:
fail('error updating submodules %s:\n%s' % (ctx.name, st.stderr))
def _new_git_repository_implementation(ctx):
if ((not ctx.attr.build_file and not ctx.attr.build_file_content) or
(ctx.attr.build_file and ctx.attr.build_file_content)):
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.bazel')
else:
ctx.file('BUILD.bazel', 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),
'verbose': attr.bool(default=False),
'strip_prefix': attr.string(default='')
}
new_git_repository = repository_rule(
implementation = _new_git_repository_implementation,
attrs = dict(_common_attrs.items() + {
'build_file': attr.label(allow_single_file=True),
'build_file_content': attr.string(),
}.items())
)
"""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.
strip_prefix: A directory prefix to strip from the extracted files.
"""
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.
strip_prefix: A directory prefix to strip from the extracted files.
"""
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