#!/usr/bin/env python

# rhona, cleans up unassociated binary and source packages
# Copyright (C) 2000, 2001  James Troup <james@nocrew.org>
# $Id: rhona,v 1.9 2001-03-14 20:31:56 troup Exp $

# 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 2 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 General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

###################################################################################################

# 07:05|<elmo> well.. *shrug*.. no, probably not.. but to fix it,
#      |       we're going to have to implement reference counting
#      |       through dependencies.. do we really want to go down
#      |       that road?
#
# 07:05|<Culus> elmo: Augh! <brain jumps out of skull>

###################################################################################################

import os, pg, stat, string, sys, time
import apt_pkg
import utils

###################################################################################################

projectB = None
Cnf = None
delete_date = None;
overrides = {};

###################################################################################################

def usage (exit_code):
    print """Usage: rhona [OPTION]... [CHANGES]...
  -D, --debug=VALUE         debug
  -n, --no-action           don't do anything
  -v, --verbose             be verbose
  -V, --version             display version number and exit"""
    sys.exit(exit_code)

###################################################################################################

# FIXME: why can't we make (sane speed) UPDATEs out of these SELECTs?

def check_binaries():
    global delete_date;
    
    print "Checking for orphaned binary packages..."

    # Get the list of binary packages not in a suite and mark them for
    # deletion.

    q = projectB.query("""
SELECT b.file FROM binaries b WHERE NOT EXISTS
        (SELECT ba.bin FROM bin_associations ba WHERE ba.bin = b.id)""");
    ql = q.getresult();

    projectB.query("BEGIN WORK");
    for i in ql:
        file_id = i[0];
        projectB.query("UPDATE files SET last_used = '%s' WHERE id = %s" % (delete_date, file_id))
    projectB.query("COMMIT WORK");

    # Check for any binaries which are marked for eventual deletion
    # but are now used again.

    q = projectB.query("""
SELECT b.file FROM binaries b, files f
   WHERE f.last_used IS NOT NULL AND f.id = b.file AND
      EXISTS (SELECT suite FROM bin_associations ba WHERE ba.bin = b.id)""");
    ql = q.getresult();
    projectB.query("BEGIN WORK");
    for i in ql:
        file_id = i[0];
        projectB.query("UPDATE files SET last_used = NULL WHERE id = %s" % (file_id));
    projectB.query("COMMIT WORK");

def check_sources():
    global delete_date;

    print "Checking for orphaned source packages..."

    # Get the list of source packages not in a suite and not linked to
    # by any binary packages.

    q = projectB.query("""
SELECT s.id, s.file FROM source s
  WHERE NOT EXISTS
   (SELECT sa.suite FROM src_associations sa WHERE sa.source = s.id)
  AND NOT EXISTS (SELECT b.id FROM binaries b WHERE b.source = s.id)""");
    ql = q.getresult();

    projectB.query("BEGIN WORK");
    for i in ql:
        source_id = i[0];
        dsc_file_id = i[1];

        # Mark the .dsc file for deletion
        projectB.query("UPDATE files SET last_used = '%s' WHERE id = %s" % (delete_date, dsc_file_id))
        # Mark all other files references by .dsc too if they're not used by anyone else
        x = projectB.query("SELECT f.id FROM files f, dsc_files d WHERE d.source = %s AND d.file = f.id" % (source_id));
        for j in x.getresult():
            file_id = i[0];
            y = projectB.query("SELECT id FROM dsc_files d WHERE file = %s" % (file_id));
            if len(y.getresult()) == 1:
                projectB.query("UPDATE files SET last_used = '%s' WHERE id = %s" % (delete_date, file_id));
    projectB.query("COMMIT WORK");

    # Check for any sources which are marked for deletion but which
    # are now used again.

    q = projectB.query("""
SELECT f.id FROM source s, files f, dsc_files df
  WHERE f.last_used IS NOT NULL AND s.id = df.source AND df.file = f.id
    AND ((EXISTS (SELECT sa.suite FROM src_associations sa WHERE sa.source = s.id))
      OR (EXISTS (SELECT b.id FROM binaries b WHERE b.source = s.id)))""");
    ql = q.getresult();
    # Could be done in SQL; but left this way for hysterical raisins
    # [and freedom to innovate don'cha know?]
    projectB.query("BEGIN WORK");
    for i in ql:
        file_id = i[0];
        projectB.query("UPDATE files SET last_used = NULL WHERE id = %s" % (file_id));
    projectB.query("COMMIT WORK");

def check_files():
    global delete_date;

    # FIXME: this is evil; nothing should ever be in this state.  if
    # they are, it's a bug and the files should not be auto-deleted.

    return;

    print "Checking for unused files..."

    # Check for files not references in either binaries or dsc_files
    used = {};
    q = projectB.query("SELECT file FROM binaries");
    for i in q.getresult():
        used[i[0]] = "";
    q = projectB.query("SELECT file FROM dsc_files");
    for i in q.getresult():
        used[i[0]] = "";
        
    all = {};
    q = projectB.query("SELECT f.id, l.path, f.filename FROM files f, location l WHERE f.location = l.id;");
    for i in q.getresult():
        all[i[0]] = i[1] + i[2];

    projectB.query("BEGIN WORK");
    for id in all.keys():
        if not used.has_key(id):
            projectB.query("UPDATE files SET last_used = '%s' WHERE id = %s" % (delete_date, id));
    projectB.query("COMMIT WORK");
    
def clean_binaries():
    global delete_date;

    # We do this here so that the binaries we remove will have their
    # source also removed (if possible).

    print "Cleaning binaries from the DB..."
    if not Cnf["Rhona::Options::No-Action"]:
        before = time.time();
        sys.stdout.write("[Deleting from binaries table... ");
        projectB.query("DELETE FROM binaries WHERE EXISTS (SELECT id FROM files WHERE binaries.file = files.id AND files.last_used <= '%s')" % (delete_date));
        sys.stdout.write("done. (%d)]\n" % (int(time.time()-before)));

def clean():
    global delete_date;
    count = 0;
    size = 0;

    print "Cleaning out packages..."

    # Ensure destination directory exists
    dest = Cnf["Dir::Morgue"] + '/' + Cnf["Rhona::MorgueSubDir"];
    if not os.path.exists(dest):
        os.mkdir(dest);
        
    # Delete from source
    if not Cnf["Rhona::Options::No-Action"]:
        before = time.time();
        sys.stdout.write("[Deleting from source table... ");
        projectB.query("DELETE FROM dsc_files WHERE EXISTS (SELECT df.id FROM source s, files f, dsc_files df WHERE f.last_used <= '%s' AND s.file = f.id AND s.id = df.source AND df.id = dsc_files.id)" % (delete_date));
        projectB.query("DELETE FROM source WHERE EXISTS (SELECT id FROM files WHERE source.file = files.id AND files.last_used <= '%s')" % (delete_date));
        sys.stdout.write("done. (%d)]\n" % (int(time.time()-before)));
        
    # Delete files from the pool
    q = projectB.query("SELECT l.path, f.filename FROM location l, files f WHERE f.last_used <= '%s' AND l.id = f.location" % (delete_date));
    for i in q.getresult():
        filename = i[0] + i[1];
        if not os.path.exists(filename):
            sys.stderr.write("E: can not find %s.\n" % (filename));
            continue;
        if os.path.isfile(filename):
            if os.path.islink(filename):
                count = count + 1;
                if Cnf["Rhona::Options::No-Action"]:
                    print "Removing symlink %s..." % (filename);
                else:
                    os.unlink(filename);
            else:
                size = size + os.stat(filename)[stat.ST_SIZE];
                count = count + 1;
                if Cnf["Rhona::Options::No-Action"]:
                    print "Cleaning %s to %s..." % (filename, dest);
                else:
                    utils.move(filename, dest);
        else:
            sys.stderr.write("%s is neither symlink nor file?!\n" % (filename));
            sys.exit(1);
    # delete from files
    if not Cnf["Rhona::Options::No-Action"]:
        before = time.time();
        sys.stdout.write("[Deleting from files table... ");
        projectB.query("DELETE FROM files WHERE last_used <= '%s'" % (delete_date));
        sys.stdout.write("done. (%d)]\n" % (int(time.time()-before)));
    if count > 0:
        sys.stderr.write("Cleaned %d files, %s.\n" % (count, utils.size_type(size)));

def clean_maintainers():
    print "Cleaning out unused Maintainer entries..."
    
    used = {};
    q = projectB.query("SELECT maintainer FROM binaries WHERE maintainer IS NOT NULL");
    for i in q.getresult():
        used[i[0]] = "";
    q = projectB.query("SELECT maintainer FROM source WHERE maintainer IS NOT NULL");
    for i in q.getresult():
        used[i[0]] = "";

    all = {};
    q = projectB.query("SELECT id, name FROM maintainer");
    for i in q.getresult():
        all[i[0]] = i[1];

    count = 0;
    projectB.query("BEGIN WORK");
    for id in all.keys():
        if not used.has_key(id):
            if not Cnf["Rhona::Options::No-Action"]:
                projectB.query("DELETE FROM maintainer WHERE id = %s" % (id));
            count = count + 1;
    projectB.query("COMMIT WORK");

    if count > 0:
        sys.stderr.write("Cleared out %d maintainer entries.\n" % (count));

def main():
    global Cnf, projectB, delete_date;
    
    projectB = pg.connect('projectb', 'localhost');

    apt_pkg.init();
    
    Cnf = apt_pkg.newConfiguration();
    apt_pkg.ReadConfigFileISC(Cnf,utils.which_conf_file());

    Arguments = [('D',"debug","Rhona::Options::Debug", "IntVal"),
                 ('h',"help","Rhona::Options::Help"),
                 ('n',"no-action","Rhona::Options::No-Action"),
                 ('V',"version","Rhona::Options::Version")];
    
    apt_pkg.ParseCommandLine(Cnf,Arguments,sys.argv);
    Options = Cnf.SubTree("Rhona::Options")

    if Options["Help"]:
        usage(0);
        
    if Options["Version"]:
        print "rhona version 0.0000000000";
        usage(0);

    override_filename = Cnf["Dir::OverrideDir"] + Cnf["Rhona::OverrideFilename"];
    if not os.access(override_filename, os.R_OK):
        sys.stderr.write("W: Could not find source-only override file '%s'.\n" % (override_filename));

    delete_date = time.strftime("%Y-%m-%d %H:%M", time.localtime(time.time()-int(Cnf["Rhona::StayOfExecution"])));

    check_binaries();
    clean_binaries();
    check_sources();
    #check_files();
    clean();
    clean_maintainers();

if __name__ == '__main__':
    main()