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+# Copyright 2017 Google Inc. All rights reserved.
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+#
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+# Licensed under the Apache License, Version 2.0 (the "License");
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+# you may not use this file except in compliance with the License.
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+# You may obtain a copy of the License at
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+#
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+# http://www.apache.org/licenses/LICENSE-2.0
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+#
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+# Unless required by applicable law or agreed to in writing, software
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+# distributed under the License is distributed on an "AS IS" BASIS,
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+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+# See the License for the specific language governing permissions and
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+# limitations under the License.
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+
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+# Set of utility functions to build and run go code with microfactory
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+#
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+# Inputs:
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+# ${TOP}: The top of the android source tree
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+# ${OUT_DIR}: The output directory location (defaults to ${TOP}/out)
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+# ${OUT_DIR_COMMON_BASE}: Change the default out directory to
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+# ${OUT_DIR_COMMON_BASE}/$(basename ${TOP})
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+
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+# Ensure GOROOT is set to the in-tree version.
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+case $(uname) in
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+ Linux)
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+ export GOROOT="${TOP}/prebuilts/go/linux-x86/"
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+ ;;
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+ Darwin)
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+ export GOROOT="${TOP}/prebuilts/go/darwin-x86/"
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+ ;;
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+ *) echo "unknown OS:" $(uname) >&2 && exit 1;;
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+esac
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+
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+# Find the output directory
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+function getoutdir
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+{
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+ local out_dir="${OUT_DIR-}"
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+ if [ -z "${out_dir}" ]; then
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+ if [ "${OUT_DIR_COMMON_BASE-}" ]; then
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+ out_dir="${OUT_DIR_COMMON_BASE}/$(basename ${TOP})"
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+ else
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+ out_dir="${TOP}/out"
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+ fi
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+ fi
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+ echo "${out_dir}"
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+}
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+
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+# Bootstrap microfactory from source if necessary and use it to build the
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+# requested binary.
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+#
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+# Arguments:
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+# $1: name of the requested binary
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+# $2: package name
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+function build_go
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+{
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+ # Increment when microfactory changes enough that it cannot rebuild itself.
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+ # For example, if we use a new command line argument that doesn't work on older versions.
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+ local mf_version=2
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+
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+ local mf_src="${TOP}/build/soong/cmd/microfactory"
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+
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+ local out_dir=$(getoutdir)
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+ local mf_bin="${out_dir}/microfactory_$(uname)"
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+ local mf_version_file="${out_dir}/.microfactory_$(uname)_version"
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+ local built_bin="${out_dir}/$1"
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+ local from_src=1
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+
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+ if [ -f "${mf_bin}" ] && [ -f "${mf_version_file}" ]; then
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+ if [ "${mf_version}" -eq "$(cat "${mf_version_file}")" ]; then
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+ from_src=0
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+ fi
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+ fi
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+
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+ local mf_cmd
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+ if [ $from_src -eq 1 ]; then
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+ mf_cmd="${GOROOT}/bin/go run ${mf_src}/microfactory.go"
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+ else
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+ mf_cmd="${mf_bin}"
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+ fi
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+
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+ ${mf_cmd} -s "${mf_src}" -b "${mf_bin}" \
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+ -pkg-path "android/soong=${TOP}/build/soong" -trimpath "${TOP}/build/soong" \
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+ -o "${built_bin}" $2
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+
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+ if [ $from_src -eq 1 ]; then
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+ echo "${mf_version}" >"${mf_version_file}"
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+ fi
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+}
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