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#!/bin/bash

###############################################################################
# Copyright (c) 2011 Linaro
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Eclipse Public License v1.0
# which accompanies this distribution, and is available at
# http://www.eclipse.org/legal/epl-v10.html
###############################################################################
#
# $1 = mirror service host
# $2 = build CONFIG, base64-encoded
#

BUILD_SCRIPT_ROOT=$(readlink -f "$(dirname "${0}")/../build-scripts")

source "${BUILD_SCRIPT_ROOT}"/helpers
REPO_TOOL_URL="https://android-git.linaro.org/gitweb?p=tools/repo.git;a=blob_plain;f=repo;hb=refs/heads/stable"

# Dump system release to build log
echo
cat /etc/issue

set -xe

# We need to map which build config to trigger based on the change.
function map_build_config() {
    case $GERRIT_PROJECT in
        "platform/manifest") echo "premerge-ci/armv8-android-juno-lsk";;
        "android/device/linaro/juno") echo "premerge-ci/armv8-android-juno-lsk";;
        "device/linaro/common") echo "premerge-ci/armv8-android-juno-lsk";;
        "device/linaro/juno32") echo "premerge-ci/armv8-android-juno32-lsk";;
        "device/linaro/vexpress") echo "premerge-ci/vexpress-lcr";;
        "device/linaro/fvp-armv8") echo "premerge-ci/armv8-android-fvp-lsk";;
        "android-patchsets") echo "premerge-ci/armv8-android-juno-lsk";;
    esac
}

# We need ramdisk size when executing under root, but still don't want
# to evaluate build config (== arbitrary code) as such.
function get_ramdisk_size () {
    sudo -E -H -u jenkins-build bash -es <<\EOF
    source /var/run/build-tools/build-config
    echo $RAMDISK_SIZE
EOF
}

function update-repo-tool () {
    curl --location ${REPO_TOOL_URL} > /tmp/repo
    chmod a+x /tmp/repo
    mv /tmp/repo /usr/local/bin/repo
}

if is_on_ec2; then
    update-repo-tool
fi

mkdir -p $(get_build_config)/build-tools

if ! $BUILD_SCRIPT_ROOT/../node/prepare_build_config.py --base64 "$2"; then
    echo "Early exit due to build environment validation failure"
    exit 1
fi
# At this point, safely sourceable build config is in /tmp/build-tools/build-config
cat $(get_build_config)/build-tools/build-config
source $(get_build_config)/build-tools/build-config

if [ -n "$BUILD_CONFIG_REPO" ]; then
    echo "Fetching build config indirectly from git"
    save_dir=$PWD
    rm -rf /tmp/buildconf.$$
    mkdir -p /tmp/buildconf.$$
    cd /tmp/buildconf.$$
    git clone "$BUILD_CONFIG_REPO"
    cd *
    git checkout "$BUILD_CONFIG_BRANCH"
    $BUILD_SCRIPT_ROOT/../node/prepare_build_config.py "$(cat "$BUILD_CONFIG_FILENAME")"
    cd $save_dir
    source $(get_build_config)/build-tools/build-config
fi

if [ -n "$GERRIT_PROJECT" ] && [ $GERRIT_EVENT_TYPE == "patchset-created" ] ; then
    echo "Fetching build config indirectly from git for gerrit trigger"
    save_dir=$PWD
    rm -rf /tmp/buildconf.$$
    mkdir -p /tmp/buildconf.$$
    cd /tmp/buildconf.$$
    git clone https://android.git.linaro.org/git/android-build-configs.git
    cd *
    git checkout master
    build_config=$(map_build_config)
    $BUILD_SCRIPT_ROOT/../node/prepare_build_config.py "$(cat $build_config)"
    cd $save_dir
    source $(get_build_config)/build-tools/build-config
fi


# Stopgap measure to cleanup environment on instances reused for different jobs
mount | grep -E "^tmpfs on .+workspace/" | awk ' {print $3}' | xargs --no-run-if-empty -n1 umount

umount build/out/target || true
umount build/out || true
umount build || true

if is_on_ec2; then
    rm -rf build
fi
mkdir -p build

if is_on_ec2; then
    ramdisk_size=$(get_ramdisk_size $2)

    if [ -z "$ramdisk_size" ]; then
        ramdisk_size=0
    fi
fi

# Put build/* on a ramdisk to speed up build
if is_on_ec2; then
    if [ -z "$ramdisk_size" -o "$ramdisk_size" != "0" ]; then
        mem_total=`cat /proc/meminfo | grep MemTotal | sed -s 's/[^0-9]*\([0-9]*\) kB/\1/'`
        if [ "$mem_total" -gt 15680064 ]; then
          ramdisk_size=${ramdisk_size:-11750M}
          echo "Using $ramdisk_size tmpfs for build"
          mount -t tmpfs -o size=$ramdisk_size tmpfs build
        elif [ "$mem_total" -gt 12485760 ]; then
        # XXX mounting build/out/target on a tmpfs is probably a bit android specific...
          ramdisk_size=${ramdisk_size:-11G}
          echo "Using $ramdisk_size tmpfs for build/out/target#"
          mkdir -p build/out/target
          mount -t tmpfs -o size=$ramdisk_size tmpfs build/out/target
        else
          mkdir build/out
        fi
    fi
else
    mkdir build/out
fi

if is_on_ec2; then
    chown :nogroup -R /mnt/jenkins
    chown jenkins-build:nogroup -R build
fi

cd build
if is_on_ec2; then
    exec_cmd="sudo -E -H -u jenkins-build bash"
else
    exec_cmd="bash"
fi
$exec_cmd -xes "${BUILD_SCRIPT_ROOT}" "$@" <<\EOF
export BUILD_SCRIPT_ROOT="${1}"
HOST="${2}"
source "${BUILD_SCRIPT_ROOT}"/helpers
set -a
source $(get_build_config)/build-tools/build-config
set +a


# Backward compatibility with SCRIPT_NAME
if [ -n "$SCRIPT_NAME" ]; then
  BUILD_TYPE="$SCRIPT_NAME"
  echo "WARNING: SCRIPT_NAME is deprecated, use BUILD_TYPE instead"
fi
if [ -z "$BUILD_TYPE" ]; then
  BUILD_TYPE=build-android
fi

if [ "$(echo "$BUILD_TYPE" | sed -n -e 's/^[-a-zA-Z_]\+$/&/p')" != "$BUILD_TYPE" ]; then
  echo "Invalid BUILD_TYPE: $BUILD_TYPE"
  exit 1
fi
exec bash -xe "${BUILD_SCRIPT_ROOT}/${BUILD_TYPE}" "${HOST}"
EOF