build.sh

#!/usr/bin/env bash

bash --version 2>&1 | head -n 1

set -eo pipefail
SCRIPT_DIR=$(cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd)

###########################################################################
# CONFIGURATION
###########################################################################

BUILD_PROJECT_FILE="$SCRIPT_DIR/.build/Build.csproj"
TEMP_DIRECTORY="$SCRIPT_DIR/.nuke/temp"

DOTNET_GLOBAL_FILE="$SCRIPT_DIR//global.json"
DOTNET_INSTALL_URL="https://dot.net/v1/dotnet-install.sh"
DOTNET_CHANNEL="Current"

export DOTNET_CLI_TELEMETRY_OPTOUT=1
export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
export DOTNET_MULTILEVEL_LOOKUP=0

###########################################################################
# EXECUTION
###########################################################################

function FirstJsonValue {
    perl -nle 'print $1 if m{"'"$1"'": "([^"]+)",?}' <<< "${@:2}"
}

# If dotnet CLI is installed globally and it matches requested version, use for execution
if [ -x "$(command -v dotnet)" ] && dotnet --version &>/dev/null; then
    export DOTNET_EXE="$(command -v dotnet)"
else
    # Download install script
    DOTNET_INSTALL_FILE="$TEMP_DIRECTORY/dotnet-install.sh"
    mkdir -p "$TEMP_DIRECTORY"
    curl -Lsfo "$DOTNET_INSTALL_FILE" "$DOTNET_INSTALL_URL"
    chmod +x "$DOTNET_INSTALL_FILE"

    DOTNET_DIRECTORY="$TEMP_DIRECTORY/dotnet-unix"

    # install older frameworks for tests
    "$DOTNET_INSTALL_FILE" --install-dir "$DOTNET_DIRECTORY" --version "3.1.409" --no-path
    "$DOTNET_INSTALL_FILE" --install-dir "$DOTNET_DIRECTORY" --version "5.0.401" --no-path

    # If global.json exists, load expected version
    if [[ -f "$DOTNET_GLOBAL_FILE" ]]; then
        DOTNET_VERSION=$(FirstJsonValue "version" "$(cat "$DOTNET_GLOBAL_FILE")")
        if [[ "$DOTNET_VERSION" == ""  ]]; then
            unset DOTNET_VERSION
        fi
    fi

    # Install by channel or version
    if [[ -z ${DOTNET_VERSION+x} ]]; then
        "$DOTNET_INSTALL_FILE" --install-dir "$DOTNET_DIRECTORY" --channel "$DOTNET_CHANNEL" --no-path
    else
        "$DOTNET_INSTALL_FILE" --install-dir "$DOTNET_DIRECTORY" --version "$DOTNET_VERSION" --no-path
    fi
    export DOTNET_EXE="$DOTNET_DIRECTORY/dotnet"
fi

echo "Microsoft (R) .NET Core SDK version $("$DOTNET_EXE" --version)"

"$DOTNET_EXE" build "$BUILD_PROJECT_FILE" /nodeReuse:false /p:UseSharedCompilation=false -nologo -clp:NoSummary --verbosity quiet
"$DOTNET_EXE" run --project "$BUILD_PROJECT_FILE" --no-build -- "$@"