#!/bin/bash
set -e

BRANCH_PATH="/var/lib/steamos-branch"

if [[ "$#" = 1 ]]; then
  case "$1" in
    "-c")
      branch=$(cat "$BRANCH_PATH" 2> /dev/null || echo "rel")
      case "$branch" in
        "rel" | "rc" | "beta" | "bc" | "main")
          echo "$branch"
          exit 0
          ;;
        *)
          echo "unknown branch name in $BRANCH_PATH: $branch" 1>&2
          exit 1
          ;;
      esac
      ;;
    "-l")
      echo rel
      echo rc
      echo beta
      echo bc
      echo main
      exit 0
      ;;
    "rel" | "rc" | "beta" | "bc" | "main")
      echo "$1" > "$BRANCH_PATH"
      exit 0
      ;;
  esac
fi

echo "Usage: steamos-select-branch <-c|-l|rel|rc|beta|bc|main>" 1>&2