install: add moonraker system deps json file

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

scripts/install-moonraker.sh

@@ -15,6 +15,17 @@ INSTANCE_ALIAS="${MOONRAKER_ALIAS:-moonraker}"
 SERVICE_VERSION="1"
 MACHINE_PROVIDER="systemd_cli"
 
+package_decode_script=$( cat << EOF
+import sys
+import json
+try:
+  ret = json.load(sys.stdin)
+except Exception:
+  exit(0)
+sys.stdout.write(' '.join(ret['debian']))
+EOF
+)
+
 # Step 2: Clean up legacy installation
 cleanup_legacy() {
     if [ -f "/etc/init.d/moonraker" ]; then
@@ -30,18 +41,30 @@ cleanup_legacy() {
 # Step 3: Install packages
 install_packages()
 {
-    PKGLIST="python3-virtualenv python3-dev"
-    PKGLIST="${PKGLIST} libopenjp2-7 python3-libgpiod liblmdb-dev"
-    PKGLIST="${PKGLIST} libsodium-dev zlib1g-dev libjpeg-dev packagekit"
-    PKGLIST="${PKGLIST} wireless-tools curl"
-
     # Update system package info
     report_status "Running apt-get update..."
     sudo apt-get update --allow-releaseinfo-change
 
+    system_deps="${SRCDIR}/scripts/system-dependencies.json"
+    if [ -f "${system_deps}" ]; then
+        if [ ! -x "$(command -v python3)" ]; then
+            report_status "Installing python3 base package..."
+            sudo apt-get install --yes python3
+        fi
+        PKGS="$( cat ${system_deps} | python3 -c "${package_decode_script}" )"
+
+    else
+        echo "Error: system-dependencies.json not found, falling back to legacy pacakge list"
+        PKGLIST="${PKGLIST} python3-virtualenv python3-dev python3-libgpiod liblmdb-dev"
+        PKGLIST="${PKGLIST} libopenjp2-7 libsodium-dev zlib1g-dev libjpeg-dev packagekit"
+        PKGLIST="${PKGLIST} wireless-tools curl"
+        PKGS=${PKGLIST}
+    fi
+
     # Install desired packages
-    report_status "Installing packages..."
+    report_status "Installing Moonraker Dependencies:"
-    sudo apt-get install --yes ${PKGLIST}
+    report_status "${PKGS}"
+    sudo apt-get install --yes ${PKGS}
 }
 
 # Step 4: Create python virtual environment

scripts/make_sysdeps.py

@@ -0,0 +1,57 @@
+#! /usr/bin/python3
+# Create system dependencies json file from the install script
+#
+# Copyright (C) 2023 Eric Callahan <arksine.code@gmail.com>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license
+from __future__ import annotations
+import argparse
+import pathlib
+import json
+import re
+from typing import List, Dict
+
+def make_sysdeps(input: str, output: str, distro: str, truncate: bool) -> None:
+    sysdeps: Dict[str, List[str]] = {}
+    outpath = pathlib.Path(output).expanduser().resolve()
+    if outpath.is_file() and not truncate:
+        sysdeps = json.loads(outpath.read_bytes())
+    inst_path: pathlib.Path = pathlib.Path(input).expanduser().resolve()
+    if not inst_path.is_file():
+        raise Exception(f"Unable to locate install script: {inst_path}")
+    data = inst_path.read_text()
+    plines: List[str] = re.findall(r'PKGLIST="(.*)"', data)
+    plines = [p.lstrip("${PKGLIST}").strip() for p in plines]
+    packages: List[str] = []
+    for line in plines:
+        packages.extend(line.split())
+    sysdeps[distro] = packages
+    outpath.write_text(json.dumps(sysdeps, indent=4))
+
+
+if __name__ == "__main__":
+    def_path = pathlib.Path(__file__).parent
+    desc = (
+        "make_sysdeps - generate system dependency json file from an install script"
+    )
+    parser = argparse.ArgumentParser(description=desc)
+    parser.add_argument(
+        "-i", "--input", metavar="<install script>",
+        help="path of the install script to read",
+        default=f"{def_path}/install-moonraker.sh"
+    )
+    parser.add_argument(
+        "-o", "--output", metavar="<output file>",
+        help="path of the system dependency file to write",
+        default=f"{def_path}/system-dependencies.json"
+    )
+    parser.add_argument(
+        "-d", "--distro", metavar="<linux distro>",
+        help="linux distro for dependencies", default="debian"
+    )
+    parser.add_argument(
+        "-t", "--truncate", action="store_true",
+        help="truncate output file"
+    )
+    args = parser.parse_args()
+    make_sysdeps(args.input, args.output, args.distro, args.truncate)

scripts/system-dependencies.json

@@ -0,0 +1,15 @@
+{
+    "debian": [
+        "python3-virtualenv",
+        "python3-dev",
+        "python3-libgpiod",
+        "liblmdb-dev",
+        "libopenjp2-7",
+        "libsodium-dev",
+        "zlib1g-dev",
+        "libjpeg-dev",
+        "packagekit",
+        "wireless-tools",
+        "curl"
+    ]
+}