revert getsdk scripts.

build.sh

@@ -20,11 +20,55 @@ SCRIPT_DIR=$(cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd)
 ###########################################################################
 
 BUILD_PROJECT_FILE="$SCRIPT_DIR/nukebuild/_build.csproj"
+TEMP_DIRECTORY="$SCRIPT_DIR//.tmp"
+
+DOTNET_GLOBAL_FILE="$SCRIPT_DIR//global.json"
+DOTNET_INSTALL_URL="https://raw.githubusercontent.com/dotnet/cli/master/scripts/obtain/dotnet-install.sh"
+DOTNET_CHANNEL="Current"
 
 export DOTNET_CLI_TELEMETRY_OPTOUT=1
 export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
 export NUGET_XMLDOC_MODE="skip"
 
-dotnet --info
+###########################################################################
+# EXECUTION
+###########################################################################
+
+function FirstJsonValue {
+    perl -nle 'print $1 if m{"'$1'": "([^"\-]+)",?}' <<< ${@:2}
+}
+
+# If global.json exists, load expected version
+if [ -f "$DOTNET_GLOBAL_FILE" ]; then
+    DOTNET_VERSION=$(FirstJsonValue "version" $(cat "$DOTNET_GLOBAL_FILE"))
+    if [ "$DOTNET_VERSION" == ""  ]; then
+        unset DOTNET_VERSION
+    fi
+fi
+
+# If dotnet is installed locally, and expected version is not set or installation matches the expected version
+if [[ -x "$(command -v dotnet)" && (-z ${DOTNET_VERSION+x} || $(dotnet --version) == "$DOTNET_VERSION") || "$SKIP_DOTNET_DOWNLOAD" == "1" ]]; then
+    export DOTNET_EXE="$(command -v dotnet)"
+else
+    DOTNET_DIRECTORY="$TEMP_DIRECTORY/dotnet-unix"
+    export DOTNET_EXE="$DOTNET_DIRECTORY/dotnet"
+    
+    # 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"
+    
+    # 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 "$DOTNET_VERSION" --no-path
+    fi
+fi
+
+export PATH=$DOTNET_DIRECTORY:$PATH
+
+echo "Microsoft (R) .NET Core SDK version $("$DOTNET_EXE" --version)"
 
-dotnet run --project "$BUILD_PROJECT_FILE" -- ${BUILD_ARGUMENTS[@]}
+"$DOTNET_EXE" run --project "$BUILD_PROJECT_FILE" -- ${BUILD_ARGUMENTS[@]}

get-sdk.sh

@@ -1,22 +0,0 @@
-#!/usr/bin/env bash
-
-SCRIPT_DIR="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
-SDK_DIR=$SCRIPT_DIR/sdk
-
-DOTNET_INSTALL_FILE="$SDK_DIR/dotnet-install.sh"
-DOTNET_INSTALL_URL="https://raw.githubusercontent.com/dotnet/cli/master/scripts/obtain/dotnet-install.sh"
-
-DOTNET_VERSION=5.0.402
-
-mkdir -p "$SDK_DIR"
-
-if [ ! -f "$DOTNET_INSTALL_FILE" ]; then
-	curl -Lsfo "$DOTNET_INSTALL_FILE" "$DOTNET_INSTALL_URL"
-	chmod +x "$DOTNET_INSTALL_FILE"
-fi
-
-"$DOTNET_INSTALL_FILE" --install-dir "$SDK_DIR" --version 5.0.402
-"$DOTNET_INSTALL_FILE" --install-dir "$SDK_DIR" --version 3.1.20 --runtime dotnet
-"$DOTNET_INSTALL_FILE" --install-dir "$SDK_DIR" --version 3.1.20 --runtime aspnetcore
-
-