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#!/usr/bin/env bash

__scriptpath=$(cd "$(dirname "$0")"; pwd -P)
__init_tools_log=$__scriptpath/init-tools.log
__PACKAGES_DIR=$__scriptpath/packages
__TOOLRUNTIME_DIR=$__scriptpath/Tools
__DOTNET_PATH=$__TOOLRUNTIME_DIR/dotnetcli
__DOTNET_CMD=$__DOTNET_PATH/dotnet
if [ -z "$__BUILDTOOLS_SOURCE" ]; then __BUILDTOOLS_SOURCE=https://dotnet.myget.org/F/dotnet-buildtools/api/v3/index.json; fi
export __BUILDTOOLS_USE_CSPROJ=true
__BUILD_TOOLS_PACKAGE_VERSION=$(cat $__scriptpath/BuildToolsVersion.txt)
__DOTNET_TOOLS_VERSION=$(cat $__scriptpath/DotnetCLIVersion.txt)
__ILASM_VERSION=$(cat $__scriptpath/ILAsmVersion.txt)
__BUILD_TOOLS_PATH=$__PACKAGES_DIR/microsoft.dotnet.buildtools/$__BUILD_TOOLS_PACKAGE_VERSION/lib
__INIT_TOOLS_RESTORE_PROJECT=$__scriptpath/init-tools.msbuild
__BUILD_TOOLS_SEMAPHORE=$__TOOLRUNTIME_DIR/$__BUILD_TOOLS_PACKAGE_VERSION/init-tools.complete

if [ -e $__BUILD_TOOLS_SEMAPHORE ]; then
    echo "Tools are already initialized"
    return #return instead of exit because this script is inlined in other scripts which we don't want to exit
fi

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

if [ -d "$DotNetBuildToolsDir" ]; then
    echo "Using tools from '$DotNetBuildToolsDir'."
    ln -s "$DotNetBuildToolsDir" "$__TOOLRUNTIME_DIR"

    if [ ! -e "$__DOTNET_CMD" ]; then
        echo "ERROR: Ensure that $DotNetBuildToolsDir contains the .NET Core SDK at $__DOTNET_PATH"
        exit 1
    fi

    echo "Done initializing tools."
    mkdir -p "$(dirname "$__BUILD_TOOLS_SEMAPHORE")" && touch $__BUILD_TOOLS_SEMAPHORE
    return #return instead of exit because this script is inlined in other scripts which we don't want to exit
fi

echo "Running: $__scriptpath/init-tools.sh" > $__init_tools_log

display_error_message()
{
    echo "Please check the detailed log that follows." 1>&2
    cat "$__init_tools_log" 1>&2
}

# Executes a command and retries if it fails.
execute_with_retry() {
    local count=0
    local retries=${retries:-5}
    local waitFactor=${waitFactor:-6} 
    until "$@"; do
        local exit=$?
        count=$(( $count + 1 ))
        if [ $count -lt $retries ]; then
            local wait=$(( waitFactor ** (( count - 1 )) ))
            echo "Retry $count/$retries exited $exit, retrying in $wait seconds..."
            sleep $wait
        else    
            say_err "Retry $count/$retries exited $exit, no more retries left."
            return $exit
        fi
    done

    return 0
}

if [ ! -e $__DOTNET_PATH ]; then
    if [ -z "$__DOTNET_PKG" ]; then
        if [ "$(uname -m | grep "i[3456]86")" = "i686" ]; then
            echo "Warning: build not supported on 32 bit Unix"
        fi

        __PKG_ARCH=x64

        OSName=$(uname -s)
        case $OSName in
            Darwin)
                OS=OSX
                __PKG_RID=osx
                ulimit -n 2048
                # Format x.y.z as single integer with three digits for each part
                VERSION=`sw_vers -productVersion| sed -e 's/\./ /g' | xargs printf "%03d%03d%03d"`
                if [ "$VERSION" -lt 010012000 ]; then
                    echo error: macOS version `sw_vers -productVersion` is too old. 10.12 is needed as minimum.
                    exit 1
                fi
                ;;

            Linux)
                __PKG_RID=linux
                OS=Linux

                if [ -e /etc/os-release ]; then
                    source /etc/os-release
                    if [[ $ID == "alpine" ]]; then
                        # remove the last version digit
                        VERSION_ID=${VERSION_ID%.*}
                    __PKG_RID=alpine.$VERSION_ID
                    fi
                elif [ -e /etc/redhat-release ]; then
                    redhatRelease=$(</etc/redhat-release)
                    if [[ $redhatRelease == "CentOS release 6."* || $redhatRelease == "Red Hat Enterprise Linux Server release 6."* ]]; then
                    __PKG_RID=rhel.6
                    fi
                fi

                ;;

            *)
            echo "Unsupported OS '$OSName' detected. Downloading linux-$__PKG_ARCH tools."
                OS=Linux
                __PKG_RID=linux
                ;;
      esac
    __DOTNET_PKG=dotnet-sdk-${__DOTNET_TOOLS_VERSION}-$__PKG_RID-$__PKG_ARCH
    fi
    mkdir -p "$__DOTNET_PATH"

    echo "Installing dotnet cli..."
    __DOTNET_LOCATION="https://dotnetcli.azureedge.net/dotnet/Sdk/${__DOTNET_TOOLS_VERSION}/${__DOTNET_PKG}.tar.gz"

    install_dotnet_cli() {
        echo "Installing '${__DOTNET_LOCATION}' to '$__DOTNET_PATH/dotnet.tar'" >> "$__init_tools_log"
        rm -rf -- "$__DOTNET_PATH/*"
        # curl has HTTPS CA trust-issues less often than wget, so lets try that first.
        if command -v curl > /dev/null; then
            curl --retry 10 -sSL --create-dirs -o $__DOTNET_PATH/dotnet.tar ${__DOTNET_LOCATION}
        else
            wget -q -O $__DOTNET_PATH/dotnet.tar ${__DOTNET_LOCATION}
        fi
        cd $__DOTNET_PATH
        tar -xf $__DOTNET_PATH/dotnet.tar
    }
    execute_with_retry install_dotnet_cli >> "$__init_tools_log" 2>&1

    cd $__scriptpath
fi

if [ ! -e $__BUILD_TOOLS_PATH ]; then
    echo "Restoring BuildTools version $__BUILD_TOOLS_PACKAGE_VERSION..."
    echo "Running: $__DOTNET_CMD restore \"$__INIT_TOOLS_RESTORE_PROJECT\" --no-cache --packages $__PACKAGES_DIR --source $__BUILDTOOLS_SOURCE /p:BuildToolsPackageVersion=$__BUILD_TOOLS_PACKAGE_VERSION /p:ToolsDir=$__TOOLRUNTIME_DIR" >> $__init_tools_log
    $__DOTNET_CMD restore "$__INIT_TOOLS_RESTORE_PROJECT" --no-cache --packages $__PACKAGES_DIR --source $__BUILDTOOLS_SOURCE /p:BuildToolsPackageVersion=$__BUILD_TOOLS_PACKAGE_VERSION /p:ToolsDir=$__TOOLRUNTIME_DIR >> $__init_tools_log
    if [ ! -e "$__BUILD_TOOLS_PATH/init-tools.sh" ]; then
        echo "ERROR: Could not restore build tools correctly." 1>&2
        display_error_message
    fi
fi

if [ -z "$__ILASM_RID" ]; then
    __ILASM_RID=$__PKG_RID-$__PKG_ARCH
fi

echo "Using RID $__ILASM_RID for BuildTools native tools"

export ILASMCOMPILER_VERSION=$__ILASM_VERSION
export NATIVE_TOOLS_RID=$__ILASM_RID

echo "Initializing BuildTools..."
echo "Running: $__BUILD_TOOLS_PATH/init-tools.sh $__scriptpath $__DOTNET_CMD $__TOOLRUNTIME_DIR" >> $__init_tools_log

# Executables restored with .NET Core 2.0 do not have executable permission flags. https://github.com/NuGet/Home/issues/4424
chmod +x $__BUILD_TOOLS_PATH/init-tools.sh
$__BUILD_TOOLS_PATH/init-tools.sh $__scriptpath $__DOTNET_CMD $__TOOLRUNTIME_DIR >> $__init_tools_log
if [ "$?" != "0" ]; then
    echo "ERROR: An error occurred when trying to initialize the tools." 1>&2
    display_error_message
    exit 1
fi

echo "Making all .sh files executable under Tools."
# Executables restored with .NET Core 2.0 do not have executable permission flags. https://github.com/NuGet/Home/issues/4424
ls $__scriptpath/Tools/*.sh | xargs chmod +x
ls $__scriptpath/Tools/scripts/docker/*.sh | xargs chmod +x

Tools/crossgen.sh $__scriptpath/Tools

mkdir -p "$(dirname "$__BUILD_TOOLS_SEMAPHORE")" && touch $__BUILD_TOOLS_SEMAPHORE

echo "Done initializing tools."