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#!/usr/bin/env bash

initDistroName()
{
    if [ "$1" == "Linux" ]; then
        # Detect Distro
        if [ "$(cat /etc/*-release | grep -cim1 ubuntu)" -eq 1 ]; then
            export __DistroName=ubuntu
        elif [ "$(cat /etc/*-release | grep -cim1 centos)" -eq 1 ]; then
            export __DistroName=centos
        elif [ "$(cat /etc/*-release | grep -cim1 rhel)" -eq 1 ]; then
            export __DistroName=rhel
        elif [ "$(cat /etc/*-release | grep -cim1 debian)" -eq 1 ]; then
            export __DistroName=debian
        else
            export __DistroName=""
        fi
    fi
}

__scriptpath=$(cd "$(dirname "$0")"; pwd -P)

# CI_SPECIFIC - On CI machines, $HOME may not be set. In such a case, create a subfolder and set the variable to set.
# This is needed by CLI to function.
if [ -z "$HOME" ]; then
    if [ ! -d "$__scriptpath/temp_home" ]; then
        mkdir temp_home
    fi
    export HOME=$__scriptpath/temp_home
    echo "HOME not defined; setting it to $HOME"
fi

__PACKAGES_DIR=$__scriptpath/packages
__TOOLRUNTIME_DIR=$__scriptpath/Tools
__DOTNET_PATH=$__TOOLRUNTIME_DIR/dotnetcli
__DOTNET_CMD=$__DOTNET_PATH/bin/dotnet
if [ -z "$__BUILDTOOLS_SOURCE" ]; then __BUILDTOOLS_SOURCE=https://www.myget.org/F/dotnet-buildtools/; fi
__BUILD_TOOLS_PACKAGE_VERSION=$(cat $__scriptpath/BuildToolsVersion.txt)
__DOTNET_TOOLS_VERSION=$(cat $__scriptpath/DotnetCLIVersion.txt)
__BUILD_TOOLS_PATH=$__PACKAGES_DIR/Microsoft.DotNet.BuildTools/$__BUILD_TOOLS_PACKAGE_VERSION/lib
__PROJECT_JSON_PATH=$__TOOLRUNTIME_DIR/$__BUILD_TOOLS_PACKAGE_VERSION
__PROJECT_JSON_FILE=$__PROJECT_JSON_PATH/project.json
__PROJECT_JSON_CONTENTS="{ \"dependencies\": { \"Microsoft.DotNet.BuildTools\": \"$__BUILD_TOOLS_PACKAGE_VERSION\" }, \"frameworks\": { \"dnxcore50\": { } } }"
__DistroName=""

OSName=$(uname -s)
case $OSName in
    Darwin)
        OS=OSX
        __DOTNET_PKG=dotnet-osx-x64
        ;;

    Linux)
        OS=Linux
        __DOTNET_PKG=dotnet-ubuntu-x64
        ;;

    *)
        echo "Unsupported OS $OSName detected. Downloading ubuntu-x64 tools"
        OS=Linux
        __DOTNET_PKG=dotnet-ubuntu-x64
        ;;
esac

# Initialize Linux Distribution name and .NET CLI package name.

initDistroName $OS
if [ "$__DistroName" == "centos" ]; then
    __DOTNET_PKG=dotnet-centos-x64
fi

if [ "$__DistroName" == "rhel" ]; then
    __DOTNET_PKG=dotnet-centos-x64
fi

__CLIDownloadURL=https://dotnetcli.blob.core.windows.net/dotnet/dev/Binaries/${__DOTNET_TOOLS_VERSION}/${__DOTNET_PKG}.${__DOTNET_TOOLS_VERSION}.tar.gz
echo ".NET CLI will be downloaded from $__CLIDownloadURL"

if [ ! -e $__PROJECT_JSON_FILE ]; then
 if [ -e $__TOOLRUNTIME_DIR ]; then rm -rf -- $__TOOLRUNTIME_DIR; fi

 if [ ! -e $__DOTNET_PATH ]; then
    # curl has HTTPS CA trust-issues less often than wget, so lets try that first.
    which curl > /dev/null 2> /dev/null
    if [ $? -ne 0 ]; then
      mkdir -p "$__DOTNET_PATH"
      wget -q -O $__DOTNET_PATH/dotnet.tar $__CLIDownloadURL
    else
      curl -sSL --create-dirs -o $__DOTNET_PATH/dotnet.tar $__CLIDownloadURL
    fi
    cd $__DOTNET_PATH
    tar -xf $__DOTNET_PATH/dotnet.tar
    if [ -n "$BUILDTOOLS_OVERRIDE_RUNTIME" ]; then
        find $__DOTNET_PATH -name *.ni.* | xargs rm 2>/dev/null
        cp -R $BUILDTOOLS_OVERRIDE_RUNTIME/* $__DOTNET_PATH/bin
        cp -R $BUILDTOOLS_OVERRIDE_RUNTIME/* $__DOTNET_PATH/bin/dnx
        cp -R $BUILDTOOLS_OVERRIDE_RUNTIME/* $__DOTNET_PATH/runtime/coreclr
    fi

    cd $__scriptpath
 fi

 mkdir "$__PROJECT_JSON_PATH"
 echo $__PROJECT_JSON_CONTENTS > "$__PROJECT_JSON_FILE"

 if [ ! -e $__BUILD_TOOLS_PATH ]; then
    $__DOTNET_CMD restore "$__PROJECT_JSON_FILE" --packages $__PACKAGES_DIR --source $__BUILDTOOLS_SOURCE
 fi

 sh $__BUILD_TOOLS_PATH/init-tools.sh $__scriptpath $__DOTNET_CMD $__TOOLRUNTIME_DIR
 chmod a+x $__TOOLRUNTIME_DIR/corerun
fi