add activateMatlab.py script

This is useful for when Matlab can't start due to needing license reactivation

Author: scivision

pyproject.toml

@@ -0,0 +1,2 @@
+[tool.black]
+line-length = 100

scripts/activateMatlab.py

@@ -0,0 +1,129 @@
+#!/usr/bin/env python3
+"""
+When institutional network Matlab licenses are renewed,
+Matlab might not be startable to reactivate the license.
+Hence we have a convenient Python script to find the MathWorksProductAuthorizer
+program used to re-activate the Matlab license.
+
+After running the MathWorksProductAuthorizer executable found by this script,
+Matlab should be able to start again.
+If license error 5201 still occurs upon starting Matlab, try rebooting the computer.
+This might be necessary because the Matlab service might be used in the background by other programs
+like Visual Studio Code or JupyterLab.
+"""
+
+import shutil
+import os
+import argparse
+from pathlib import Path
+import logging
+import platform
+
+try:
+    import winreg
+except ModuleNotFoundError:
+    winreg = None  # type: ignore[assignment]
+
+
+def _registry_search(release: str) -> Path | None:
+    try:
+        # must use "\" as path separator in Windows registry
+        matlab_path = winreg.QueryValue(
+            winreg.HKEY_LOCAL_MACHINE, rf"SOFTWARE\MathWorks\{release}\MATLAB"
+        )
+
+        return Path(matlab_path)
+    except (AttributeError, OSError) as e:
+        logging.debug(f"Registry key not found {e}, falling back to ProgramFiles search.")
+        return None
+
+
+def _windows_search(release: str) -> Path | None:
+    """Look at Windows registry, Program Files, Path for Matlab installation."""
+
+    if winreg is not None:
+        if (p := _registry_search(release)) is not None and p.is_dir():
+            logging.info(f"Using Matlab from registry: {p}")
+            return p
+
+    if (r := os.environ.get("ProgramFiles")) is not None:
+        if (p := Path(r) / "MATLAB" / release / "bin/win64").is_dir():
+            logging.info(f"Using Matlab from ProgramFiles: {p}")
+            return p
+
+    if (r := shutil.which("matlab")) is not None:
+        if (p := Path(r).parent / "win64").is_dir():
+            logging.info(f"Using Matlab from PATH: {p}")
+            return p
+
+    return None
+
+
+def _macos_search(release: str) -> Path | None:
+    """Search for Matlab in common macOS application directories."""
+
+    arch = platform.machine()
+    match (arch):
+        case "x86_64":
+            tail = "maci64"
+        case "arm64":
+            tail = "maca64"
+        case _:
+            raise SystemExit(f"ERROR: Unsupported architecture for macOS {arch}.")
+
+    roots = ["~/Applications", "/Applications"]
+    for root in roots:
+        if (p := Path(root).expanduser() / f"MATLAB_{release}.app" / "bin" / tail).is_dir():
+            return p
+
+    return None
+
+
+def _linux_search(release: str) -> Path | None:
+
+    if (r := shutil.which("matlab")) is not None and release in r:
+        if (p := Path(r).parent / "glnxa64").is_dir():
+            logging.info(f"Using Matlab from PATH: {p}")
+            return p
+
+    return None
+
+
+def find_activate_matlab(release: str) -> str | None:
+    """
+    Fallback to PATH if the platform-specific search fails.
+    Linux doesn't have a platform-specific search.
+    """
+    name = "MathWorksProductAuthorizer"
+
+    mr = None
+
+    match (os.name):
+        case "nt":
+            mr = _windows_search(release)
+        case "darwin":
+            mr = _macos_search(release)
+        case _:
+            mr = _linux_search(release)
+
+    return shutil.which(name, path=mr)
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Find the MathWorksProductAuthorizer executable.")
+    parser.add_argument(
+        "release",
+        type=str,
+        help="Specify the MATLAB version to search for (e.g., R2023a)",
+        default=None,
+    )
+    parser.add_argument("-v", "--verbose", action="store_true", help="Enable verbose output")
+    args = parser.parse_args()
+
+    if args.verbose:
+        logging.basicConfig(level=logging.DEBUG)
+
+    exe = find_activate_matlab(args.release)
+
+    print("run this program to reactivate the Matlab license:\n")
+    print(exe)