protected string GetInstallerScriptSnippet()

in src/BuildScriptGenerator/PlatformInstallerBase.cs [31:128]
88 lines of code
2 McCabe index (conditional complexity)

        protected string GetInstallerScriptSnippet(
            string platformName,
            string version,
            string directoryToInstall = null)
        {
            var sdkStorageBaseUrl = GetPlatformBinariesStorageBaseUrl();

            var versionDirInTemp = directoryToInstall;
            if (string.IsNullOrEmpty(versionDirInTemp))
            {
                versionDirInTemp = Path.Combine(CommonOptions.DynamicInstallRootDir, platformName, version);
            }

            var tarFile = $"{version}.tar.gz";
            var snippet = new StringBuilder();
            snippet
                .AppendLine()
                .AppendLine("PLATFORM_SETUP_START=$SECONDS")
                .AppendLine("echo")
                .AppendLine(
                $"echo \"Downloading and extracting '{platformName}' version '{version}' to '{versionDirInTemp}'...\"")
                .AppendLine($"rm -rf {versionDirInTemp}")
                .AppendLine($"mkdir -p {versionDirInTemp}")
                .AppendLine($"cd {versionDirInTemp}")
                .AppendLine("PLATFORM_BINARY_DOWNLOAD_START=$SECONDS")
                .AppendLine(
                $"curl -D headers.txt -SL \"{sdkStorageBaseUrl}/{platformName}/{platformName}-{version}.tar.gz\" " +
                $"--output {tarFile} >/dev/null 2>&1")
                .AppendLine("PLATFORM_BINARY_DOWNLOAD_ELAPSED_TIME=$(($SECONDS - $PLATFORM_BINARY_DOWNLOAD_START))")
                .AppendLine("echo \"Downloaded in $PLATFORM_BINARY_DOWNLOAD_ELAPSED_TIME sec(s).\"")

                // Search header name ignoring case
                .AppendLine("echo Verifying checksum...")
                .AppendLine("headerName=\"x-ms-meta-checksum\"")
                .AppendLine("checksumHeader=$(cat headers.txt | grep -i $headerName: | tr -d '\\r')")

                // Change header and value to lowercase
                .AppendLine("checksumHeader=$(echo $checksumHeader | tr '[A-Z]' '[a-z]')")
                .AppendLine("checksumValue=${checksumHeader#\"$headerName: \"}")
                .AppendLine("rm -f headers.txt")
                .AppendLine("echo Extracting contents...")
                .AppendLine($"tar -xzf {tarFile} -C .")
                .AppendLine($"platformName=\"{platformName}\"")
                // use sha256 for golang and sha512 for all other platforms 
                .AppendLine($"if [ \"$platformName\" = \"golang\" ]; then")
                .AppendLine($"echo \"performing sha256sum for : {platformName}...\"")
                .AppendLine($"echo \"$checksumValue {version}.tar.gz\" | sha256sum -c - >/dev/null 2>&1")
                .AppendLine("else")
                .AppendLine($"echo \"performing sha512 checksum for: {platformName}...\"")
                .AppendLine($"echo \"$checksumValue {version}.tar.gz\" | sha512sum -c - >/dev/null 2>&1")
                .AppendLine("fi")
                .AppendLine($"rm -f {tarFile}")
                .AppendLine("PLATFORM_SETUP_ELAPSED_TIME=$(($SECONDS - $PLATFORM_SETUP_START))")
                .AppendLine("echo \"Done in $PLATFORM_SETUP_ELAPSED_TIME sec(s).\"")
                .AppendLine("echo")
                .AppendLine("oryxImageDetectorFile=\"/opt/oryx/.imagetype\"")
                .AppendLine($"if [ -f \"$oryxImageDetectorFile\" ] && [ \"$platformName\" = \"dotnet\" ] && grep -q \"jamstack\" \"$oryxImageDetectorFile\"; then")
                .AppendLine("echo \"image detector file exists, platform is dotnet..\"")
                .AppendLine($"export dotnet=/opt/dotnet/{version}/dotnet")
                .AppendLine($"source /opt/tmp/build/createSymlinksForDotnet.sh")
                .AppendLine("fi")
                .AppendLine($"if [ -f \"$oryxImageDetectorFile\" ] && [ \"$platformName\" = \"dotnet\" ] && grep -q \"vso-focal\" \"$oryxImageDetectorFile\"; then")
                .AppendLine("echo \"image detector file exists, platform is dotnet..\"")
                .AppendLine($"source /opt/tmp/build/createSymlinksForDotnet.sh")
                .AppendLine("fi")
                .AppendLine($"if [ -f \"$oryxImageDetectorFile\" ] && [ \"$platformName\" = \"nodejs\" ] && grep -q \"vso-focal\" \"$oryxImageDetectorFile\"; then")
                .AppendLine("echo \"image detector file exists, platform is nodejs..\"")
                .AppendLine($"mkdir -p /home/codespace/.nodejs")
                .AppendLine($"ln -sfn /opt/nodejs/{version} /home/codespace/.nodejs/current")
                .AppendLine("fi")
                .AppendLine($"if [ -f \"$oryxImageDetectorFile\" ] && [ \"$platformName\" = \"php\" ] && grep -q \"vso-focal\" \"$oryxImageDetectorFile\"; then")
                .AppendLine("echo \"image detector file exists, platform is php..\"")
                .AppendLine($"mkdir -p /home/codespace/.php")
                .AppendLine($"ln -sfn /opt/php/{version} /home/codespace/.php/current")
                .AppendLine("fi")
                .AppendLine($"if [ -f \"$oryxImageDetectorFile\" ] && [ \"$platformName\" = \"python\" ] && grep -q \"vso-focal\" \"$oryxImageDetectorFile\"; then")
                .AppendLine("   echo \"image detector file exists, platform is python..\"")
                .AppendLine($"  [ -d \"/opt/python/$VERSION\" ] && echo /opt/python/{version}/lib >> /etc/ld.so.conf.d/python.conf")
                .AppendLine($"  ldconfig")
                .AppendLine($"  mkdir -p /home/codespace/.python")
                .AppendLine($"  ln -sfn /opt/python/{version} /home/codespace/.python/current")
                .AppendLine("fi")
                .AppendLine($"if [ -f \"$oryxImageDetectorFile\" ] && [ \"$platformName\" = \"java\" ] && grep -q \"vso-focal\" \"$oryxImageDetectorFile\"; then")
                .AppendLine("echo \"image detector file exists, platform is java..\"")
                .AppendLine($"mkdir -p /home/codespace/.java")
                .AppendLine($"ln -sfn /opt/java/{version} /home/codespace/.java/current")
                .AppendLine("fi")
                .AppendLine($"if [ -f \"$oryxImageDetectorFile\" ] && [ \"$platformName\" = \"ruby\" ] && grep -q \"vso-focal\" \"$oryxImageDetectorFile\"; then")
                .AppendLine("echo \"image detector file exists, platform is ruby..\"")
                .AppendLine($"mkdir -p /home/codespace/.ruby")
                .AppendLine($"ln -sfn /opt/ruby/{version} /home/codespace/.ruby/current")
                .AppendLine("fi")

                // Write out a sentinel file to indicate downlaod and extraction was successful
                .AppendLine($"echo > {Path.Combine(versionDirInTemp, SdkStorageConstants.SdkDownloadSentinelFileName)}");

            return snippet.ToString();
        }