Current File : //usr/lib/python3/dist-packages/CommandNotFound/db/creator.py
#!/usr/bin/python3
import errno
import json
import logging
import os
import sqlite3
import subprocess
import sys
import time
import apt_pkg
apt_pkg.init()
# TODO:
# - add apt.conf.d snippet for download handling
# - add apt::update::post-invoke-success handler
component_priorities = {
'main': 120,
'universe': 100,
'contrib': 80,
'restricted': 60,
'non-free': 40,
'multiverse': 20,
}
# pkgnames in here are blacklisted
create_db_sql="""
CREATE TABLE IF NOT EXISTS "commands"
(
[cmdID] INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
[pkgID] INTEGER NOT NULL,
[command] TEXT,
FOREIGN KEY ([pkgID]) REFERENCES "pkgs" ([pkgID])
);
CREATE TABLE IF NOT EXISTS "packages"
(
[pkgID] INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
[name] TEXT,
[version] TEXT,
[component] TEXT,
[priority] INTEGER
);
CREATE INDEX IF NOT EXISTS idx_commands_command ON commands (command);
CREATE INDEX IF NOT EXISTS idx_packages_name ON packages (name);
"""
# FIXME:
# - add support for foreign arch in DB (add foreign commands if there
# is not native command)
# - addd support for -backports: pkgname must be appended with /backports
# and only be shown if there is no other command available
# - do not re-create the DB everytime, only if sources.list changed
# - add "last-mtime" into the DB, then we can skip all packages files
# where the mtime is older and we only need to update the DB
class measure:
def __init__(self, what, stats):
self.what = what
self.stats = stats
def __enter__(self):
self.now = time.time()
def __exit__(self, *args):
if not self.what in self.stats:
self.stats[self.what] = 0
self.stats[self.what] += time.time() - self.now
def rm_f(path):
try:
os.remove(path)
except OSError as e:
if e.errno != errno.ENOENT:
raise
class DbCreator:
def __init__(self, files):
self.files = files
self.primary_arch = apt_pkg.get_architectures()[0]
self.stats = {"total": 0,"total_time": time.time()}
def create(self, dbname):
metadata_file = dbname+".metadata"
if not self._db_update_needed(metadata_file):
logging.info(
"%s does not require an update (inputs unchanged)", dbname)
return
tmpdb = dbname+".tmp"
with sqlite3.connect(tmpdb) as con:
try:
con.executescript(create_db_sql)
self._fill_commands(con)
except sqlite3.OperationalError as e:
# There might be a parallel cnf-update-db process, updating the
# tmpdb. Just stop execution in this case, as the other process
# should produce the correct result.
if str(e) == "database is locked":
logging.warning(
"%s is locked by another process. Ignoring.", tmpdb)
sys.exit(0)
else:
raise e
# remove now stale metadata
rm_f(metadata_file)
# put database in place
os.rename(tmpdb, dbname)
# add new metadata
with open(metadata_file, "w") as fp:
json.dump(self._calc_input_metadata(), fp)
def _db_update_needed(self, metadata_file):
if not os.path.exists(metadata_file):
return True
try:
with open(metadata_file) as fp:
meta = json.load(fp)
return meta != self._calc_input_metadata()
except Exception as e:
logging.warning("cannot read %s: %s", metadata_file, e)
return True
def _calc_input_metadata(self):
meta = {}
for p in self.files:
st = os.stat(p)
meta[p] = {
'st_ino': st.st_ino,
'st_dev': st.st_dev,
'st_uid': st.st_uid,
'st_gid': st.st_gid,
'st_size': st.st_size,
'st_mtime': st.st_mtime,
}
return meta
def _fill_commands(self, con):
for f in self.files:
with subprocess.Popen(["/usr/lib/apt/apt-helper", "cat-file", f], stdout=subprocess.PIPE) as sub:
if "Contents" in f:
self._parse_single_contents_file(con, f, sub.stdout)
else:
self._parse_single_commands_file(con, sub.stdout)
if sub.wait() != 0:
raise subprocess.CalledProcessError(returncode=sub.returncode,
cmd="/usr/lib/apt/apt-helper cat-file {}".format(f))
self.stats["total_time"] = time.time() - self.stats["total_time"]
logging.info("processed %i packages in %.2fs" % (
self.stats["total"], self.stats["total_time"]))
def _in_db(self, con, command, pkgname):
already_in_db = con.execute(
"""
SELECT packages.pkgID, name, version
FROM commands
INNER JOIN packages on packages.pkgID = commands.pkgID
WHERE commands.command=? AND packages.name=?;
""", (command, pkgname)).fetchone()
return already_in_db
def _delete_pkgid(self, con, pkgid):
con.execute("DELETE FROM packages WHERE pkgID=?", (pkgid,) )
con.execute("DELETE FROM commands WHERE pkgID=?", (pkgid,) )
def _get_pkgid(self, con, pkgname):
have_pkg = con.execute(
"SELECT pkgID from packages WHERE name=?", (pkgname,)).fetchone()
if have_pkg:
return have_pkg[0]
return None
def _insert_package(self, con, pkgname, version, component, priority):
cur=con.execute("""
INSERT INTO packages (name, version, component, priority)
VALUES (?, ?, ?, ?);
""", (pkgname, version, component, priority))
return cur.lastrowid
def _insert_command(self, con, command, pkg_id):
con.execute("""
INSERT INTO commands (command, pkgID) VALUES (?, ?);
""", (command, pkg_id))
def _parse_single_commands_file(self, con, fp):
tagf = apt_pkg.TagFile(fp)
# file empty
if not tagf.step():
return
# read header
suite=tagf.section["suite"]
# FIXME: support backports
if suite.endswith("-backports"):
return
component=tagf.section["component"]
arch=tagf.section["arch"]
# FIXME: add code for secondary arch handling!
if arch != "all" and arch != self.primary_arch:
return
# step over the pkgs
while tagf.step():
self.stats["total"] += 1
pkgname=tagf.section["name"]
# allow to override the viisble pkgname to accomodate for
# cases like "python2.7" which is part of python2.7-minimal
# but users should just install python2.7
if tagf.section.get("visible-pkgname"):
pkgname = tagf.section["visible-pkgname"]
version=tagf.section.get("version", "")
ignore_commands=set()
if tagf.section.get("ignore-commands", ""):
ignore_commands=set(tagf.section.get("ignore-commands", "").split(","))
for command in tagf.section["commands"].split(","):
if command in ignore_commands:
continue
# see if we have the command already
with measure("sql_already_db", self.stats):
already_in_db=self._in_db(con, command, pkgname)
if already_in_db:
# we found a version that is higher what we have
# in the DB -> remove current, insert higher
if apt_pkg.version_compare(version, already_in_db[2]) > 0:
logging.debug("replacing exiting %s in DB (higher version)" % command)
with measure("sql_delete_already_in_db", self.stats):
self._delete_pkgid(con, already_in_db[0])
else:
logging.debug("skipping %s from %s (lower/same version)" % (command, suite))
continue
logging.debug("adding %s from %s/%s (%s)" % (
command, pkgname, version, suite))
# insert new data
with measure("sql_have_pkg", self.stats):
pkg_id = self._get_pkgid(con, pkgname)
if not pkg_id:
priority = component_priorities[component]
priority += int(tagf.section.get("priority-bonus", "0"))
with measure("sql_insert_pkg", self.stats):
pkg_id = self._insert_package(con, pkgname, version, component, priority)
with measure("sql_insert_cmd", self.stats):
self._insert_command(con, command, pkg_id)
def _parse_single_contents_file(self, con, f, fp):
# read header
suite=None # FIXME
for l in fp:
l = l.decode("utf-8")
if not (l.startswith('usr/sbin') or l.startswith('usr/bin') or
l.startswith('bin') or l.startswith('sbin')):
continue
try:
command, pkgnames = l.split(None, 1)
except ValueError:
continue
command = os.path.basename(command)
for pkgname in pkgnames.split(','):
try:
section, pkgname = pkgname.strip().rsplit('/', 1)
except ValueError:
pkgname = pkgname.strip()
section = "unknown"
if len(section.split('/')) == 2:
component, section = section.split('/')
else:
component = 'main'
# FIXME - Don't really know how.
version = None
# see if we have the command already
with measure("sql_already_db", self.stats):
already_in_db=self._in_db(con, command, pkgname)
if already_in_db:
# we found a version that is higher what we have
# in the DB -> remove current, insert higher
if False and apt_pkg.version_compare(version, already_in_db[2]) > 0:
logging.debug("replacing exiting %s in DB (higher version)" % command)
with measure("sql_delete_already_in_db", self.stats):
self._delete_pkgid(con, already_in_db[0])
else:
logging.debug("skipping %s from %s (lower/same version)" % (command, suite))
continue
logging.debug("adding %s from %s/%s (%s)" % (
command, pkgname, version, suite))
# insert new data
with measure("sql_have_pkg", self.stats):
pkg_id = self._get_pkgid(con, pkgname)
if not pkg_id:
priority = component_priorities[component]
with measure("sql_insert_pkg", self.stats):
pkg_id = self._insert_package(con, pkgname, version, component, priority)
with measure("sql_insert_cmd", self.stats):
self._insert_command(con, command, pkg_id)
if __name__ == "__main__":
logging.basicConfig(level=logging.INFO)
if len(sys.argv) < 3:
print("usage: %s <output-db-path> <files...>" % sys.argv[0])
print(" e.g.: %s commands.db ./dists/*/*/*/Commands-*" % sys.argv[0])
print(" e.g.: %s /var/lib/command-not-found/commands.db /var/lib/apt/lists/*Commands-*", sys.argv[0])
sys.exit(1)
col = DbCreator(sys.argv[2:])
col.create(sys.argv[1])
for stat, amount in col.stats.items():
logging.debug("%s: %s" % (stat, amount))
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