Allow Running Container as Runner Host User (#600)

- Added `runAsHostUser` to allow running the container as the same user as the host system. This fixes most permissions issues on self-hosted runners.
- Perform android sdk setup during entrypoint.sh to ensure it has root permissions if the user switches to a non-root user
- Automatically detect android sdk target version if parameters are not already provided to configure the sdk
- Generate a new uuid for machineID to ensure separate containers are unique to reduce license activation errors
- Add exponential retry strategy for Ubuntu license activations

dist/platforms/ubuntu/entrypoint.sh

@@ -1,47 +1,76 @@
 #!/usr/bin/env bash
 
-#
-# Create directory for license activation
-#
-
-ACTIVATE_LICENSE_PATH="$GITHUB_WORKSPACE/_activate-license~"
-mkdir -p "$ACTIVATE_LICENSE_PATH"
+# Ensure machine ID is randomized
+dbus-uuidgen > /etc/machine-id && mkdir -p /var/lib/dbus/ && ln -sf /etc/machine-id /var/lib/dbus/machine-id
 
 #
-# Run steps
-#
-source /steps/set_extra_git_configs.sh
-source /steps/set_gitcredential.sh
-source /steps/activate.sh
-source /steps/build.sh
-source /steps/return_license.sh
-
-#
-# Remove license activation directory
+# Prepare Android SDK, if needed
+# We do this here to ensure it has root permissions
 #
 
-rm -r "$ACTIVATE_LICENSE_PATH"
-chmod -R 777 "/BlankProject"
+fullProjectPath="$GITHUB_WORKSPACE/$PROJECT_PATH"
 
-#
-# Instructions for debugging
-#
+if [[ "$BUILD_TARGET" == "Android" ]]; then
+  export JAVA_HOME="$(awk -F'=' '/JAVA_HOME=/{print $2}' /usr/bin/unity-editor.d/*)"
+  ANDROID_HOME_DIRECTORY="$(awk -F'=' '/ANDROID_HOME=/{print $2}' /usr/bin/unity-editor.d/*)"
+  SDKMANAGER=$(find $ANDROID_HOME_DIRECTORY/cmdline-tools -name sdkmanager)
+  if [ -z "${SDKMANAGER}" ]
+  then
+    echo "No sdkmanager found"
+    exit 1
+  fi
 
-if [[ $BUILD_EXIT_CODE -gt 0 ]]; then
-echo ""
-echo "###########################"
-echo "#         Failure         #"
-echo "###########################"
-echo ""
-echo "Please note that the exit code is not very descriptive."
-echo "Most likely it will not help you solve the issue."
-echo ""
-echo "To find the reason for failure: please search for errors in the log above."
-echo ""
-fi;
+  if [[ -n "$ANDROID_SDK_MANAGER_PARAMETERS" ]]; then
+    echo "Updating Android SDK with parameters: $ANDROID_SDK_MANAGER_PARAMETERS"
+    $SDKMANAGER "$ANDROID_SDK_MANAGER_PARAMETERS"
+  else
+    echo "Updating Android SDK with auto detected target API version"
+    # Read the line containing AndroidTargetSdkVersion from the file
+    targetAPILine=$(grep 'AndroidTargetSdkVersion' "$fullProjectPath/ProjectSettings/ProjectSettings.asset")
 
-#
-# Exit with code from the build step.
-#
+    # Extract the number after the semicolon
+    targetAPI=$(echo "$targetAPILine" | cut -d':' -f2 | tr -d '[:space:]')
 
-exit $BUILD_EXIT_CODE
+    $SDKMANAGER "platforms;android-$targetAPI"
+  fi
+
+  echo "Updated Android SDK."
+else
+  echo "Not updating Android SDK."
+fi
+
+if [[ "$RUN_AS_HOST_USER" == "true" ]]; then
+  echo "Running as host user"
+
+  # Stop on error if we can't set up the user
+  set -e
+
+  # Get host user/group info so we create files with the correct ownership
+  USERNAME=$(stat -c '%U' "$fullProjectPath")
+  USERID=$(stat -c '%u' "$fullProjectPath")
+  GROUPNAME=$(stat -c '%G' "$fullProjectPath")
+  GROUPID=$(stat -c '%g' "$fullProjectPath")
+
+  groupadd -g $GROUPID $GROUPNAME
+  useradd -u $USERID -g $GROUPID $USERNAME
+  usermod -aG $GROUPNAME $USERNAME
+  mkdir -p "/home/$USERNAME"
+  chown $USERNAME:$GROUPNAME "/home/$USERNAME"
+
+  # Normally need root permissions to access when using su
+  chmod 777 /dev/stdout
+  chmod 777 /dev/stderr
+
+  # Don't stop on error when running our scripts as error handling is baked in
+  set +e
+
+  # Switch to the host user so we can create files with the correct ownership
+  su $USERNAME -c "$SHELL -c 'source /steps/runsteps.sh'"
+else
+  echo "Running as root"
+
+  # Run as root
+  source /steps/runsteps.sh
+fi
+
+exit $?