feat: build CouchOS Melee appliance

scripts/install_slippi.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+API_URL="${SLIPPI_RELEASE_API_URL:-https://api.github.com/repos/project-slippi/slippi-launcher/releases/latest}"
+INSTALL_DIR="${SLIPPI_INSTALL_DIR:-/home/couch/Applications}"
+TMP_DIR="$(mktemp -d)"
+trap 'rm -rf "${TMP_DIR}"' EXIT
+
+log() {
+  printf '[install_slippi] %s\n' "$*"
+}
+
+require_cmd() {
+  command -v "$1" >/dev/null 2>&1 || {
+    printf 'missing required command: %s\n' "$1" >&2
+    exit 1
+  }
+}
+
+require_cmd curl
+require_cmd jq
+require_cmd install
+
+mkdir -p "${INSTALL_DIR}"
+
+validate_asset_url() {
+  local url="$1"
+  local expected_name_regex="$2"
+  if [[ ! "${url}" =~ ^https://github\.com/project-slippi/slippi-launcher/releases/download/ ]]; then
+    printf 'unexpected asset host or path: %s\n' "${url}" >&2
+    exit 1
+  fi
+  local name
+  name="$(basename "${url}")"
+  if [[ ! "${name}" =~ ${expected_name_regex} ]]; then
+    printf 'unexpected asset name: %s\n' "${name}" >&2
+    exit 1
+  fi
+}
+
+release_json="${TMP_DIR}/release.json"
+curl -fsSL "${API_URL}" -o "${release_json}"
+
+appimage_url="$(jq -r '[.assets[] | select(.name | test("^Slippi-Launcher-.*x86_64\\.AppImage$")) | .browser_download_url] | first // empty' "${release_json}")"
+checksum_url="$(jq -r '[.assets[] | select(.name | test("(sha256|checksums?)(\\.txt)?$"; "i")) | .browser_download_url] | first // empty' "${release_json}")"
+
+if [[ -z "${appimage_url}" ]]; then
+  printf 'could not find official Slippi Launcher AppImage asset\n' >&2
+  exit 1
+fi
+validate_asset_url "${appimage_url}" '^Slippi-Launcher-.*x86_64\.AppImage$'
+
+appimage_name="$(basename "${appimage_url}")"
+appimage_path="${TMP_DIR}/${appimage_name}"
+curl -fsSL "${appimage_url}" -o "${appimage_path}"
+
+if [[ -n "${checksum_url}" ]]; then
+  validate_asset_url "${checksum_url}" '^(sha256|checksums?)(\.[A-Za-z0-9]+)?$'
+  checksum_path="${TMP_DIR}/checksums.txt"
+  curl -fsSL "${checksum_url}" -o "${checksum_path}"
+  if grep -F "${appimage_name}" "${checksum_path}" >/dev/null 2>&1; then
+    (
+      cd "${TMP_DIR}"
+      grep -F "${appimage_name}" "${checksum_path}" | sha256sum --check --status
+    )
+    log "checksum verified for ${appimage_name}"
+  else
+    printf 'checksum asset present but does not include %s\n' "${appimage_name}" >&2
+    exit 1
+  fi
+else
+  log "no upstream checksum asset published for this release; upstream verification unavailable"
+fi
+
+install -m 0755 "${appimage_path}" "${INSTALL_DIR}/${appimage_name}"
+ln -sfn "${INSTALL_DIR}/${appimage_name}" "${INSTALL_DIR}/SlippiLauncher.AppImage"
+log "installed ${INSTALL_DIR}/${appimage_name}"