File: shell.py

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#! /usr/bin/python -tt
# 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 Library 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.
# Copyright 2005 Duke University

"""
A shell implementation for the yum command line interface.
"""

import sys
import cmd
import shlex
import logging

from yum import Errors
from yum.constants import *
import yum.logginglevels as logginglevels


class YumShell(cmd.Cmd):

    """
    Interactive yum shell.
    """

    def __init__(self, base):
        cmd.Cmd.__init__(self)
        self.base = base
        self.prompt = '> '
        self.result = 0
        self.identchars += '-'
        self.from_file = False # if we're running from a file, set this
        self.resultmsgs = ['Leaving Shell']
        if (len(base.extcmds)) > 0:
            self.file = base.extcmds[0]
        self.shell_specific_commands = ['repo', 'repository', 'exit', 'quit',
                'run', 'ts', 'transaction', 'config']
                
        self.commandlist = self.shell_specific_commands + self.base.yum_cli_commands.keys()
        self.logger = logging.getLogger("yum.cli")
        self.verbose_logger = logging.getLogger("yum.verbose.cli")

        # NOTE: This is shared with self.base ... so don't reassign.
        self._shell_history_cmds = []

    def _shell_history_add_cmds(self, cmds):
        if not self.base.conf.history_record:
            return

        self._shell_history_cmds.append(cmds)

    def _shlex_split(self, input_string):
        """split the input using shlex rules, and error or exit accordingly"""
        
        inputs = []
        if input_string is None: # apparently shlex.split() doesn't like None as its input :)
            return inputs
            
        try:
            inputs = shlex.split(input_string)
        except ValueError, e:
            self.logger.critical('Script Error: %s', e)
            if self.from_file:
                raise Errors.YumBaseError, "Fatal error in script, exiting"
        
        return inputs
        
    def script(self):
        try:
            fd = open(self.file, 'r')
        except IOError:
            sys.exit("Error: Cannot open %s for reading" % self.file)
        lines = fd.readlines()
        fd.close()
        self.from_file = True
        for line in lines:
            self.onecmd(line)
        self.onecmd('EOF')
        return True
            
    def default(self, line):
        if len(line) > 0 and line.strip()[0] == '#':
            pass
        else:
            (cmd, args, line) = self.parseline(line)
            if cmd not in self.commandlist:
                xargs = [cmd]
                self.base.plugins.run('args', args=xargs)
                if xargs[0] == cmd:
                    self.do_help('')
                    return False
            if cmd == 'shell':
                return
            self.base.cmdstring = line
            self.base.cmdstring = self.base.cmdstring.replace('\n', '')
            self.base.cmds = self._shlex_split(self.base.cmdstring)
            self.base.plugins.run('args', args=self.base.cmds)

            self._shell_history_add_cmds(self.base.cmds)

            try:
                self.base.parseCommands()
            except Errors.YumBaseError:
                pass
            else:
                self.base.doCommands()
    
    def emptyline(self):
        pass

    def completenames(self, text, line, begidx, endidx):
        ret = cmd.Cmd.completenames(self, text, line, begidx, endidx)
        for command in self.base.yum_cli_commands:
            if command.startswith(text) and command != "shell":
                ret.append(command)
        return ret

    def do_help(self, arg):
        msg = """
    Shell specific arguments:
      config - set config options
      repository (or repo) - enable/disable/list repositories
      transaction (or ts) - list, reset or run the transaction set
      run - run the transaction set
      exit or quit - exit the shell
    """
            
        if arg in ['transaction', 'ts']:
            msg = """
    %s arg
      list: lists the contents of the transaction
      reset: reset (zero-out) the transaction
      solve: run the dependency solver on the transaction
      run: run the transaction
                  """ % arg
        elif arg in ['repo', 'repository']:
            msg = """
    %s arg [option]
      list: lists repositories and their status. option = [all] name/id glob
      enable: enable repositories. option = repository id
      disable: disable repositories. option = repository id
    """ % arg
    
        elif arg == 'config':
            msg = """
    %s arg [value]
      args: debuglevel, errorlevel, obsoletes, gpgcheck, assumeyes, exclude
        If no value is given it prints the current value.
        If value is given it sets that value.
        """ % arg
        
        else:
            self.base.shellUsage()
        
        self.verbose_logger.info(msg)
        
    def do_EOF(self, line):
        self.resultmsgs = ['Leaving Shell']
        return True
    
    def do_quit(self, line):
        self.resultmsgs = ['Leaving Shell']
        return True
    
    def do_exit(self, line):
        self.resultmsgs = ['Leaving Shell']
        return True
    
    def do_ts(self, line):
        self.do_transaction(line)

    def do_transaction(self, line):
        (cmd, args, line) = self.parseline(line)
        if cmd in ['list', None]:
            self.verbose_logger.log(logginglevels.INFO_2,
                self.base.listTransaction())
        
        elif cmd == 'reset':
            self.base.closeRpmDB()
        
        elif cmd == 'solve':
            try:
                (code, msgs) = self.base.buildTransaction()
            except Errors.YumBaseError, e:
                self.logger.critical('Error building transaction: %s', e)
                return False
                
            if code == 1:
                for msg in msgs:
                    self.logger.critical('Error: %s', msg)
            else:
                self.verbose_logger.log(logginglevels.INFO_2,
                    'Success resolving dependencies')
                
        elif cmd == 'run':
            return self.do_run('')
            
        else:
            self.do_help('transaction')
    
    def do_config(self, line):
        (cmd, args, line) = self.parseline(line)
        # logs
        if cmd in ['debuglevel', 'errorlevel']:
            opts = self._shlex_split(args)
            if not opts:
                self.verbose_logger.log(logginglevels.INFO_2, '%s: %s', cmd,
                    getattr(self.base.conf, cmd))
            else:
                val = opts[0]
                try:
                    val = int(val)
                except ValueError:
                    self.logger.critical('Value %s for %s cannot be made to an int', val, cmd)
                    return
                setattr(self.base.conf, cmd, val)
                if cmd == 'debuglevel':
                    logginglevels.setDebugLevel(val)
                elif cmd == 'errorlevel':
                    logginglevels.setErrorLevel(val)
        # bools
        elif cmd in ['gpgcheck', 'repo_gpgcheck', 'obsoletes', 'assumeyes']:
            opts = self._shlex_split(args)
            if not opts:
                self.verbose_logger.log(logginglevels.INFO_2, '%s: %s', cmd,
                    getattr(self.base.conf, cmd))
            else:
                value = opts[0]
                if value.lower() not in BOOLEAN_STATES:
                    self.logger.critical('Value %s for %s is not a Boolean', value, cmd)
                    return False
                value = BOOLEAN_STATES[value.lower()]
                setattr(self.base.conf, cmd, value)
                if cmd == 'obsoletes':
                    self.base.up = None
        
        elif cmd in ['exclude']:
            args = args.replace(',', ' ')
            opts = self._shlex_split(args)
            if not opts:
                msg = '%s: ' % cmd
                msg = msg + ' '.join(getattr(self.base.conf, cmd))
                self.verbose_logger.log(logginglevels.INFO_2, msg)
                return False
            else:
                setattr(self.base.conf, cmd, opts)
                if self.base.pkgSack:       # kill the pkgSack
                    self.base.pkgSack = None
                self.base.up = None         # reset the updates
                # reset the transaction set, we have to or we shall surely die!
                self.base.closeRpmDB() 
        else:
            self.do_help('config')

    def do_repository(self, line):
        self.do_repo(line)
        
    def do_repo(self, line):
        (cmd, args, line) = self.parseline(line)
        if cmd in ['list', None]:
            # Munge things to run the repolist command
            cmds = self._shlex_split(args)

            if not cmds:
                cmds = ['enabled']
            cmds.insert(0, 'repolist')
            self.base.cmds = cmds

            self._shell_history_add_cmds(self.base.cmds)

            try:
                self.base.parseCommands()
            except Errors.YumBaseError:
                pass
            else:
                self.base.doCommands()

        elif cmd == 'enable':
            repos = self._shlex_split(args)
            for repo in repos:
                try:
                    #  Setup the sacks/repos, we need this because we are about
                    # to setup the enabled one. And having some setup is bad.
                    self.base.pkgSack
                    changed = self.base.repos.enableRepo(repo)
                except Errors.ConfigError, e:
                    self.logger.critical(e)
                except Errors.RepoError, e:
                    self.logger.critical(e)
                    
                else:
                    for repo in changed:
                        try:
                            self.base.doRepoSetup(thisrepo=repo)
                        except Errors.RepoError, e:
                            self.logger.critical('Disabling Repository')
                            self.base.repos.disableRepo(repo)
                            return False
                            
                    self.base.up = None
            
        elif cmd == 'disable':
            repos = self._shlex_split(args)
            for repo in repos:
                try:
                    offrepos = self.base.repos.disableRepo(repo)
                except Errors.ConfigError, e:
                    self.logger.critical(e)
                except Errors.RepoError, e:
                    self.logger.critical(e)

                else:
                    # close the repos, too
                    for repoid in offrepos:
                        thisrepo = self.base.repos.repos[repoid]
                        thisrepo.close()       # kill the pkgSack
            # rebuild the indexes to be sure we cleaned up
            self.base.pkgSack.buildIndexes()
            
        else:
            self.do_help('repo')
                
    def do_test(self, line):
        (cmd, args, line) = self.parseline(line)
        print cmd
        print args
        print line
        
    def do_run(self, line):
        if len(self.base.tsInfo) > 0:
            try:
                (code, msgs) = self.base.buildTransaction()
                if code == 1:
                    for msg in msgs:
                        self.logger.critical('Error: %s', msg)
                    return False

                returnval = self.base.doTransaction()
            except Errors.YumBaseError, e:
                self.logger.critical('Error: %s', e)
            except KeyboardInterrupt, e:
                self.logger.critical('\n\nExiting on user cancel')
            except IOError, e:
                if e.errno == 32:
                    self.logger.critical('\n\nExiting on Broken Pipe')
            else:
                if returnval not in [0,1,-1]:
                    self.verbose_logger.info('Transaction encountered a serious error.')
                else:
                    if returnval == 1:
                        self.verbose_logger.info('There were non-fatal errors in the transaction')
                    elif returnval == -1:
                        self.verbose_logger.info("Transaction didn't start")
                    self.verbose_logger.log(logginglevels.INFO_2,
                        'Finished Transaction')
                self.base.closeRpmDB()