Flatpak: build from source instead of repackaging debs (#389)

flatpak/generate-sources.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+#
+# Generate offline dependency source files for Flatpak builds.
+#
+# Prerequisites:
+#   pip install flatpak-node-generator tomlkit aiohttp
+#   Clone https://github.com/flatpak/flatpak-builder-tools (for cargo generator)
+#
+# Usage:
+#   ./flatpak/generate-sources.sh
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+
+# Generate cargo-sources.json
+python3 "$SCRIPT_DIR/flatpak-builder-tools/cargo/flatpak-cargo-generator.py" \
+  -o "$SCRIPT_DIR/cargo-sources.json" "$REPO_ROOT/Cargo.lock"
+
+# Generate node-sources.json from a patched copy of the lockfile.
+# npm omits resolved/integrity for some workspace deps, and
+# flatpak-node-generator can't handle workspace link entries.
+TMPDIR=$(mktemp -d)
+trap 'rm -rf "$TMPDIR"' EXIT
+
+cp "$REPO_ROOT/package-lock.json" "$TMPDIR/package-lock.json"
+cp "$REPO_ROOT/package.json" "$TMPDIR/package.json"
+
+node "$SCRIPT_DIR/fix-lockfile.mjs" "$TMPDIR/package-lock.json"
+
+node -e "
+  const fs = require('fs');
+  const p = process.argv[1];
+  const d = JSON.parse(fs.readFileSync(p, 'utf-8'));
+  for (const [name, info] of Object.entries(d.packages || {})) {
+    if (name && (info.link || !info.resolved)) delete d.packages[name];
+  }
+  fs.writeFileSync(p, JSON.stringify(d, null, 2));
+" "$TMPDIR/package-lock.json"
+
+flatpak-node-generator --no-requests-cache \
+  -o "$SCRIPT_DIR/node-sources.json" npm "$TMPDIR/package-lock.json"