fix: align Game Mode update channels with newstesting-44.20261023.1

Select the feed matching each image branch and expose Steam channels
that match the announcement data for testing and unstable builds.

1 files changed, 23 insertions, 0 deletions

diff --git a/build_files/patch-bazzite-os-branch-select.sh b/build_files/patch-bazzite-os-branch-select.sh
index 544b1a5..a360a2e 100755
--- a/build_files/patch-bazzite-os-branch-select.sh
+++ b/build_files/patch-bazzite-os-branch-select.sh
@@ -33,3 +33,26 @@ awk -v old="$old" '
 
 install -m 0755 "$patched_file" "$file"
 rm -f "$patched_file"
+
+# Match the channel names used by Bazzite's Game Mode announcement feeds.
+# Steam's rc/beta and bc/main aliases still select the same image branches.
+python3 - "$file" <<'PY'
+from pathlib import Path
+import sys
+
+path = Path(sys.argv[1])
+text = path.read_text()
+replacements = {
+    "        testing)\n          echo rc\n": "        testing)\n          echo beta\n",
+    "        unstable)\n          echo main\n": "        unstable)\n          echo preview\n",
+    "      echo rc\n      echo beta\n      echo bc\n      echo main\n":
+        "      echo rc\n      echo beta\n      echo bc\n      echo preview\n      echo main\n",
+    "    bc|main|unstable)\n": "    bc|preview|main|unstable)\n",
+}
+for old in replacements:
+    if text.count(old) != 1:
+        raise SystemExit(f"Bazzite branch selector changed; expected exactly one {old!r}")
+for old, new in replacements.items():
+    text = text.replace(old, new, 1)
+path.write_text(text)
+PY