#!/usr/bin/env python3 # # This script is in the public domain # # Author: Johannes Schauer Marin Rodrigues <josch@mister-muffin.de> # # thin layer around /usr/lib/apt/solvers/apt, so that we can capture the solver # result # # we set Debug::EDSP::WriteSolution=yes so that Install stanzas also come with # Package and Version fields. That way, we do not also have to parse the EDSP # request and spend time matching ID numbers import subprocess import sys import os import getpass if not os.path.exists("/usr/lib/apt/solvers/apt"): print( """Error: ERR_NO_SOLVER Message: The external apt solver doesn't exist. You must install the apt-utils package. """ ) exit() fname = os.environ.get("APT_EDSP_DUMP_FILENAME") if fname is None: print( """Error: ERR_NO_FILENAME Message: You have to set the environment variable APT_EDSP_DUMP_FILENAME to a valid filename to store the dump of EDSP solver input in. For example with: export APT_EDSP_DUMP_FILENAME=/tmp/dump.edsp """ ) exit() try: with open(fname, "w") as f: with subprocess.Popen( ["/usr/lib/apt/solvers/apt", "-oDebug::EDSP::WriteSolution=yes"], stdin=sys.stdin.fileno(), stdout=subprocess.PIPE, bufsize=0, # unbuffered text=True, # open in text mode ) as p: for line in p.stdout: print(line, end="") f.write(line) except (FileNotFoundError, PermissionError) as e: print( """Error: ERR_CREATE_FILE Message: Writing EDSP solver input to file '%s' failed as it couldn't be created! """ % fname )