build.sh

#!/bin/bash
# build and pack a rust lambda library
# https://aws.amazon.com/blogs/opensource/rust-runtime-for-aws-lambda/

set -eo pipefail
mkdir -p target/lambda
export PROFILE=${PROFILE:-release}
# cargo uses different names for target
# of its build profiles
if [[ "${PROFILE}" == "release" ]]; then
    TARGET_PROFILE="${PROFILE}"
else
    TARGET_PROFILE="debug"
fi
export CARGO_TARGET_DIR=$PWD/target/lambda
(
    if [[ $# -gt 0 ]]; then
        yum install -y "$@"
    fi
    # source cargo
    . $HOME/.cargo/env
    # cargo only supports --release flag for release
    # profiles. dev is implicit
    if [ "${PROFILE}" == "release" ]; then
        cargo build ${CARGO_FLAGS:-} --${PROFILE}
    else
        cargo build ${CARGO_FLAGS:-}
    fi
) 1>&2

function package() {
    file="$1"
    if [[ "${PROFILE}" == "release" ]]; then
        objcopy --only-keep-debug "$file" "$file.debug"
        objcopy --strip-debug --strip-unneeded "$file"
        objcopy --add-gnu-debuglink="$file.debug" "$file"
    fi
    rm "$file.zip" > 2&>/dev/null || true
    # note: would use printf "@ $(basename $file)\n@=bootstrap" | zipnote -w "$file.zip"
    # if not for https://bugs.launchpad.net/ubuntu/+source/zip/+bug/519611
    if [ "$file" != ./bootstrap ] && [ "$file" != bootstrap ]; then
        mv "${file}" bootstrap
        mv "${file}.debug" bootstrap.debug > 2&>/dev/null || true
    fi
    zip "$file.zip" bootstrap
    rm bootstrap
}

cd "${CARGO_TARGET_DIR}/${TARGET_PROFILE}"
(
    . $HOME/.cargo/env
    if [ -z "$BIN" ]; then
        IFS=$'\n'
        for executable in $(cargo read-manifest | jq -r '.targets[] | select(.kind[] | contains("bin")) | .name'); do
          package "$executable"
        done
    else
        package "$BIN"
    fi

) 1>&2