Next try

build.sh

@@ -1,16 +1,6 @@
 #!/usr/bin/env bash
 
-echo $(bash --version 2>&1 | head -n 1)
-
-#CUSTOMPARAM=0
-BUILD_ARGUMENTS=()
-for i in "$@"; do
-    case $(echo $1 | awk '{print tolower($0)}') in
-        # -custom-param) CUSTOMPARAM=1;;
-        *) BUILD_ARGUMENTS+=("$1") ;;
-    esac
-    shift
-done
+bash --version 2>&1 | head -n 1
 
 set -eo pipefail
 SCRIPT_DIR=$(cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd)
@@ -20,11 +10,53 @@ SCRIPT_DIR=$(cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd)
 ###########################################################################
 
 BUILD_PROJECT_FILE="$SCRIPT_DIR/nukebuild/_build.csproj"
+TEMP_DIRECTORY="$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 NUGET_XMLDOC_MODE="skip"
+export DOTNET_MULTILEVEL_LOOKUP=0
 
-dotnet --info
+###########################################################################
+# EXECUTION
+###########################################################################
 
-dotnet run --project "$BUILD_PROJECT_FILE" -- ${BUILD_ARGUMENTS[@]}
+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 "$DOTNET_INSTALL_FILE"
+
+    # If global.json exists, load expected version
+    if [[ -f "$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
+    DOTNET_DIRECTORY="$TEMP_DIRECTORY/dotnet-unix"
+    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 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 -- "$@"