This sample project illustrates all of the necessary steps to successfully publish a Unity app to Steam with Codemagic. For a much detailed explanation of the basic project steps such as building, build versioning, code signing and publishing in general, please see the Unity Android, iOS, Windows and macOS sample project.

The codemagic.yaml in this project can be used as a starter template for building and publishing your Unity PC application to Steam with Codemagic CI/CD.

The template is for a Windows 64 bit application and uses SteamCMD to upload the build to Steam.

• A Unity Plus or Pro license. Your license is used to activate Unity on the Codemagic build server so the project can be built. The license is returned automatically once the workflow completes.
• A Steam Partner account is required to publish to Steam.

SteamCMD is a tool used to upload builds to Steam. SteamCMD requires logging in to Steam and typically requires entering a Steam Guard code. There are two ways of solving this problem.

1. Disable Steam Guard for the account doing the Steam upload. This is not recommended, as it makes the Steam account less secure.

2. Use sentry files that are generated after logging in successfully to Steam. A Steam Guard code is not required when these sentry files are present on the build machine. Thus, we will save the sentry files as secure environment variables and place them at the correct path when the build starts.

First, you need to install the SteamCMD.

mkdir ~/Steam
curl -sqL "https://steamcdn-a.akamaihd.net/client/installer/steamcmd_osx.tar.gz" | tar zxvf - -C ~/Steam

sudo apt-get install lib32gcc1
mkdir ~/Steam 
curl -sqL "https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz" | tar zxvf - -C ~/Steam

Then log into Steam using the following command, which will prompt for the Steam Guard code:

   ~/Steam/steamcmd.sh +login steam $STEAM_USERNAME $STEAM_PASSWORD

The ssfn file will be stored as ~/Steam/ssfn******************* and the config.vdf file as ~/Steam/config/config.vdf.

Warning: Keep the sentry files private; do not check them into public source control.

1. Open your Codemagic app settings, and go to the Environment variables tab.
2. Enter the desired Variable name, e.g. SSFN_FILE_NAME.
3. Enter the ssfn file name as Variable value.
4. Enter the variable group name, e.g. steam. Click the button to create the group.
5. Make sure the Secure option is selected.
6. Click the Add button to add the variable.
7. Enter another variable named SSFN_FILE and copy/paste the base64 encoded value of the ssfn file. Follow the intructions for storing binary files.
8. Repeat the previous step to add the config.vdf file as a variable named CONFIG_FILE.

Warning: When base64 encoding the files, make sure to remove the new lines \n of the encoded value before saving it to Codemagic.

If you don't want to install the SteamCMD on your local machine to obtain the sentry files, you can use Codemagic machines to do so and then copy them into your local machine using the secure copy command scp.

   scp -P <port> [email protected] ~/Library/Application\ Support/ssfn******************* .
   scp -P <port> [email protected] ~/Library/Application\ Support/config/config.vdf .

In your workflow you need to base64 decode these binary files before they can be used:

  scripts:
    - name: Decode Sentry files
      script: | 
        echo $CONFIG_FILE | base64 --decode > steam/config.vdf
        echo $SSFN_FILE | base64 --decode > steam/$SSFN_FILE_NAME

And then copy them to the correct path, depending on the build machine type:

  scripts:
    - name: Copy Sentry Files
      script: | 
        mkdir -p ~/Library/Application\ Support/Steam/config
        cp ~/clone/steam/$SSFN_FILE_NAME ~/Library/Application\ Support/Steam
        cp ~/clone/steam/config.vdf ~/Library/Application\ Support/Steam/config

  scripts:
    - name: Copy Sentry Files
      script: | 
        mkdir -p ~/Steam/config
          cp ~/clone/steam/$SSFN_FILE_NAME ~/Steam
          cp ~/clone/steam/config.vdf ~/Steam/config

To configure the upload to Steam, edit the following two files in the project by adding your application's AppID, DepotID, and branch name for deployment:

steam/app_build.vdf

"AppBuild"
{
	"AppID" "2086870" // Your AppID
	"Desc" "Published using Codemagic" // internal description for this build
	"Preview" "0" // make this a preview build only, nothing is uploaded
	"Local" "" // put content on local content server instead of uploading to Steam
	"SetLive" "cm-release" // set this build live on cm-branch branch (Change this)
	"ContentRoot" "..\win64" // content root folder relative to this script file
	"BuildOutput" ".\output\" // put build cache and log files on different drive for better performance
	"Depots"
	{
		// file mapping instructions for each depot are in separate script files
		"2086871" "depot_build.vdf"
	}
}

steam/depot_build.vdf

"DepotBuild"
{
	// Set your assigned depot ID here
	"DepotID" "2086871"

	// include all files recursivley
	"FileMapping"
	{
		// This can be a full path, or a path relative to ContentRoot
		"LocalPath" "*"

		// This is a path relative to the install folder of your game
		"DepotPath" "."
		
		// If LocalPath contains wildcards, setting this means that all
		// matching files within subdirectories of LocalPath will also
		// be included.
		"Recursive" "1"
  }
}

These are standard VDF files required for uploading a build to Steam and require your application's AppID, DepotID, and branch name for deployment.

Finally, use the following script in your codemagic.yaml to publish your app to Steam:

  scripts:
    - name: Upload Build to Steam
    script: | 
      ~/Steam/steamcmd.sh +login $STEAM_USERNAME $STEAM_PASSWORD +run_app_build ~/clone/steam/app_build.vdf +quit

Read the full documentation in here.

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