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#!/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
)
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