[Moon] snap/snap-llama.cpp: LLAMA_BUILD_UI now defaults OFF — server Web UI dropped (upstream v0.3.0 to v0.4.0) #317

Packaging Gap Detected

Maintained package: talhaHavadar/snap-llama.cpp (snap)
Upstream change: ggml-org/llama.cpp v0.3.0 to v0.4.0
Renovate PR: #316

Gap Description

In llama.cpp v0.4.0 the top-level CMakeLists.txt flipped the default for the embedded Web UI option from ON to OFF.

The llama-cpp part in snap/snapcraft.yaml builds the server (LLAMA_BUILD_SERVER defaults ON in a standalone build) but never explicitly sets -DLLAMA_BUILD_UI. Under v0.3.0 the Web UI was embedded by default; after this bump it will silently be built without the embedded Web UI. Users who open the llama-server web interface shipped in the snap will lose it unless we opt back in.

Upstream Evidence

-option(LLAMA_BUILD_UI        "llama: build the embedded Web UI for server"  ON)
-option(LLAMA_USE_PREBUILT_UI "llama: use prebuilt UI from HF Bucket when available (requires LLAMA_BUILD_UI=ON)" ON)
+option(LLAMA_BUILD_UI        "llama: build the embedded Web UI for server"  OFF)
+option(LLAMA_USE_PREBUILT_UI "llama: use prebuilt UI from HF Bucket when available" ON)

Current Packaging State

The llama-cpp part's cmake-parameters currently contains:

- -DCMAKE_INSTALL_PREFIX=/usr
- -DCMAKE_BUILD_TYPE=Release
- -DBUILD_SHARED_LIBS=ON
- -DLLAMA_USE_SYSTEM_GGML=ON
- -DGGML_NATIVE=OFF
- -DLLAMA_BUILD_TESTS=OFF
- -DLLAMA_BUILD_EXAMPLES=OFF
- -DCMAKE_PREFIX_PATH=${CRAFT_STAGE}/usr

There is no -DLLAMA_BUILD_UI flag, so the build now inherits the new upstream default of OFF.

Suggested Fix

• File: snap/snapcraft.yaml
• Change: Add -DLLAMA_BUILD_UI=ON to the cmake-parameters list in the llama-cpp part to preserve the embedded server Web UI that shipped in v0.3.0.
• Note: LLAMA_USE_PREBUILT_UI already defaults ON; building the UI may need network access at build time to fetch the prebuilt UI from the HF bucket, or the UI is built from source. If the self-hosted/offline builders cannot reach the HF bucket, also consider whether the UI build stage has the required toolchain (node) available.

Why This Matters

llama-server's built-in Web UI is the primary graphical entry point for many snap users. Silently dropping it on a version bump is a user-facing regression; explicitly pinning -DLLAMA_BUILD_UI=ON keeps behaviour stable and intentional across upstream default changes.

Automatically detected by Moon Skywalker (Renovate PR Maintenance Bot).
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