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#!/usr/bin/env python3
# Copyright (C) 2012 Michał Masłowski <mtjm@mtjm.eu>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Check which libraries are provided or required by a package, store
this in a database, update and list broken packages.
Dependencies:
- Python 3.2 or later with SQLite 3 support
- ``bsdtar``
- ``readelf``
"""
import os.path
import re
import sqlite3
import subprocess
import tempfile
#: Regexp matching an interesting dynamic entry.
_DYNAMIC = re.compile(r"^\s*[0-9a-fx]+"
"\s*\((NEEDED|SONAME)\)[^:]*:\s*\[(.+)\]$")
def make_db(path):
"""Make a new, empty, library database at *path*."""
con = sqlite3.connect(path)
con.executescript("""
create table provided(
library varchar not null,
package varchar not null
);
create table used(
library varchar not null,
package varchar not null
);
""")
con.close()
def begin(database):
"""Connect to *database* and start a transaction."""
con = sqlite3.connect(database)
con.execute("begin exclusive")
return con
def add_provided(con, package, libraries):
"""Write that *package* provides *libraries*."""
for library in libraries:
con.execute("insert into provided (package, library) values (?,?)",
(package, library))
def add_used(con, package, libraries):
"""Write that *package* uses *libraries*."""
for library in libraries:
con.execute("insert into used (package, library) values (?,?)",
(package, library))
def remove_package(con, package):
"""Remove all entries for a package."""
con.execute("delete from provided where package=?", (package,))
con.execute("delete from used where package=?", (package,))
def add_package(con, package):
"""Add entries from a named *package*."""
# Extract to a temporary directory. This could be done more
# efficiently, since there is no need to store more than one file
# at once.
with tempfile.TemporaryDirectory() as temp:
tar = subprocess.Popen(("bsdtar", "xf", package, "-C", temp))
tar.communicate()
with open(os.path.join(temp, ".PKGINFO")) as pkginfo:
for line in pkginfo:
if line.startswith("pkgname ="):
pkgname = line[len("pkgname ="):].strip()
break
# Don't list previously removed libraries.
remove_package(con, pkgname)
provided = set()
used = set()
# Search for ELFs.
for dirname, dirnames, filenames in os.walk(temp):
assert dirnames is not None # unused, avoid pylint warning
for file_name in filenames:
path = os.path.join(dirname, file_name)
with open(path, "rb") as file_object:
if file_object.read(4) != b"\177ELF":
continue
readelf = subprocess.Popen(("readelf", "-d", path),
stdout=subprocess.PIPE)
for line in readelf.communicate()[0].split(b"\n"):
match = _DYNAMIC.match(line.decode("ascii"))
if match:
if match.group(1) == "SONAME":
provided.add(match.group(2))
elif match.group(1) == "NEEDED":
used.add(match.group(2))
else:
raise AssertionError("unknown entry type "
+ match.group(1))
add_provided(con, pkgname, provided)
add_used(con, pkgname, used)
def init(arguments):
"""Initialize."""
make_db(arguments.database)
def add(arguments):
"""Add packages."""
con = begin(arguments.database)
for package in arguments.packages:
add_package(con, package)
con.commit()
con.close()
def remove(arguments):
"""Remove packages."""
con = begin(arguments.database)
for package in arguments.packages:
remove_package(con, package)
con.commit()
con.close()
def check(arguments):
"""List broken packages."""
con = begin(arguments.database)
available = set(row[0] for row
in con.execute("select library from provided"))
for package, library in con.execute("select package, library from used"):
if library not in available:
print(package, "needs", library)
con.close()
def main():
"""Get arguments and run the command."""
from argparse import ArgumentParser
parser = ArgumentParser(prog="db-check-package-libraries",
description="Check packages for "
"provided/needed libraries")
parser.add_argument("-d", "--database", type=str,
help="Database file to use",
default="package-libraries.sqlite")
subparsers = parser.add_subparsers()
subparser = subparsers.add_parser(name="init",
help="initialize the database")
subparser.set_defaults(command=init)
subparser = subparsers.add_parser(name="add",
help="add packages to database")
subparser.add_argument("packages", nargs="+", type=str,
help="package files to add")
subparser.set_defaults(command=add)
subparser = subparsers.add_parser(name="remove",
help="remove packages from database")
subparser.add_argument("packages", nargs="+", type=str,
help="package names to remove")
subparser.set_defaults(command=remove)
subparser = subparsers.add_parser(name="check",
help="list broken packages")
subparser.set_defaults(command=check)
arguments = parser.parse_args()
arguments.command(arguments)
if __name__ == "__main__":
main()
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