Build an OpenWRT target with some extra packages, either using the OpenWRT image builder, or compile from git

openwrt_build.sh

#!/usr/bin/env bash
set -euo pipefail

target=${1:-}
subtarget=${2:-}
profile=${3:-}
release=${4:-snapshot}
target_path=$(readlink -f "${5:-$(pwd)}")
packages="luci luci-base luci-mod-admin-full luci-proto-relay luci-app-statistics"

# set this to 0 to build from git instead (NOTE: release parameter will need to be a git revision!)
builder=0

if [[ -z "$target" || -z "$subtarget" || -z "$profile" ]]; then
  echo "usage: $0 target subtarget profile [release] [target_path]"
  echo "example: $0 mvebu cortexa9 linksys_wrt1900acs 18.06.4 /tmp/mybuild"
  exit 1
fi

cores=$(nproc --all)
threads=$((cores+1))
scratch=$(mktemp -d -t tmp.XXXXXXXXXXXXX)
function finish {
  rm -rf "$scratch"
}
trap finish EXIT
cd "$scratch"

echo "Building OpenWRT $release for ${target}-${subtarget}-${profile}"
echo "Detected $cores cores, using $threads threads for build"

if [[ "$builder" == 1 ]]; then
  echo "Downloading OpenWRT image builder..."

  builder_archive="openwrt-imagebuilder-${target}-${subtarget}.Linux-x86_64.tar.xz"
  builder_url="https://downloads.openwrt.org/releases/${release}/targets/${target}/${subtarget}/${builder_archive}"
  if [[ "$release" == "snapshot" || "$release" == "master" ]]; then
    builder_url="https://downloads.openwrt.org/snapshots/targets/${target}/${subtarget}/${builder_archive}"
  fi

  wget --quiet "$builder_url"
  tar xf "$builder_archive"
  cd "$(basename "$builder_archive" .tar.xz)"

  make -j"$threads" image \
    PROFILE="$profile" \
    PACKAGES="$packages"
else
  echo "Downloading from git..."

  git clone --quiet https://github.com/openwrt/openwrt.git "$scratch"
  git checkout --quiet "$release"

  ./scripts/feeds update -a
  ./scripts/feeds install -a

  cat << EOF > .config
CONFIG_TARGET_${target}=y
CONFIG_TARGET_${target}_${subtarget}_DEVICE_${profile}=y
EOF

  for package in $packages; do
    echo "CONFIG_PACKAGE_${package}=y" >> .config
  done

  make defconfig
  make download
  make -j"$threads"
fi

cp -r "bin/targets/${target}/${subtarget}/." "$target_path"