Add recipe to build CIPD package with relocatable Conda environment.

scripts/slave/recipes/infra/build_conda_cipd_pkg.py

+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+DEPS = [
+  'cipd',
+  'conda',
+  'file',
+  'recipe_engine/path',
+  'recipe_engine/platform',
+  'recipe_engine/time',
+]
+
+
+# See https://repo.continuum.io/miniconda/. Miniconda3 is not supported.
+CONDA_VERSION = 'Miniconda2-3.18.3'
+
+
+# These conda packages will be installed into Conda environment.
+EXTRA_CONDA_PACKAGES = [
+  'matplotlib',
+  'numpy',
+  'scipy',
+]
+
+
+def RunSteps(api):
+  # Prepare staging directory to install conda into.
+  staging_dir = api.path['slave_build'].join('conda_staging_dir')
+  api.file.rmtree('cleaning staging dir', staging_dir)
+
+  # Install miniconda and all Conda packages.
+  conda = api.conda.install(CONDA_VERSION, staging_dir)
+  for pkg in EXTRA_CONDA_PACKAGES:
+    conda.install(pkg)
+
+  # Wrap finished conda environment into CIPD package.
+  cipd_pkg_name = 'infra/conda_python/' + api.cipd.platform_suffix()
+  cipd_pkg_file = api.path['slave_build'].join('conda_python.cipd')
+  api.cipd.install_client()
+  conda.convert_to_cipd_package(cipd_pkg_name, cipd_pkg_file)
+
+  # Upload the CIPD package to the server.
+  #
+  # Conda installs unpinned packages at HEAD, and in general the resulting
+  # environment is not reproducible. Tag it with current time, to know when it
+  # was built.
+  if api.platform.is_win:
+    creds = 'C:\\creds\\service_accounts\\service-account-cipd-builder.json'
+  else:
+    creds = '/creds/service_accounts/service-account-cipd-builder.json'
+  api.cipd.set_service_account_credentials(creds)
+  api.cipd.register(
+      package_name=cipd_pkg_name,
+      package_path=cipd_pkg_file,
+      refs=['latest'],
+      tags={
+        'conda': CONDA_VERSION.replace('.', '-'),
+        'ts': api.time.utcnow().strftime('%Y-%m-%dT%H-%M'),
+      })
+
+
+def GenTests(api):
+  yield (
+    api.test('linux') +
+    api.platform.name('linux')
+  )
+  yield (
+    api.test('mac') +
+    api.platform.name('mac')
+  )
+  yield (
+    api.test('win') +
+    api.platform.name('win')
+  )