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/usr/bin/add-apt-repository is in python-software-properties 0.82.7.5.

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The actual contents of the file can be viewed below.

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#!/usr/bin/python

import os
import sys
import gettext
import locale

from softwareproperties.SoftwareProperties import SoftwareProperties
from softwareproperties.ppa import DEFAULT_KEYSERVER, expand_ppa_line
from softwareproperties import lp_application_name
from aptsources.sourceslist import SourceEntry
from optparse import OptionParser
from gettext import gettext as _
from urllib2 import HTTPError, URLError

def utf8(s):
    """
    Takes a string or unicode object and returns a utf-8 encoded
    string, errors are ignored
    """
    if s is None:
        return None
    if isinstance(s, unicode):
        return s.encode("utf-8", "ignore")
    return unicode(s, "utf8", "ignore").encode("utf8")

def _maybe_suggest_ppa_name_based_on_user(user):
    try:
        from launchpadlib.launchpad import Launchpad
        lp = Launchpad.login_anonymously(lp_application_name, "production")
        try:
            user_inst = lp.people[user]
            entity_name = "team" if user_inst.is_team else "user"
            if len(user_inst.ppas) > 0:
                print _("The %s named '%s' has no PPA named '%s'" 
                        %(entity_name, user, ppa_name))
                print _("Please choose from the following available PPAs:")
                for ppa in user_inst.ppas:
                    print _(" * '%s':  %s" %(ppa.name, ppa.displayname))
            else:
                print _("The %s named '%s' does not have any PPA"
                        %(entity_name, user))
        except KeyError:
            pass
    except ImportError:
        print _("Please check that the PPA name or format is correct.")



def utf8(s):
    """
    Takes a string or unicode object and returns a utf-8 encoded
    string, errors are ignored
    """
    if s is None:
        return None
    if isinstance(s, unicode):
        return s.encode("utf-8", "ignore")
    return unicode(s, "utf8", "ignore").encode("utf8")

if __name__ == "__main__":
    try:
        locale.setlocale(locale.LC_ALL, "")
    except:
        pass
    usage = """Usage: %prog <sourceline>

%prog is a script for adding apt sources.list entries. 
It can be used to add any repository and also provides a shorthand 
syntax for adding a Launchpad PPA (Personal Package Archive)
repository.

<sourceline> - The apt repository source line to add. This is one of:
  a complete apt line in quotes, 
  a repo url and areas in quotes (areas defaults to 'main')
  a PPA shortcut.

  Examples:
    apt-add-repository 'deb http://myserver/path/to/repo stable myrepo'
    apt-add-repository 'http://myserver/path/to/repo myrepo'
    apt-add-repository 'https://packages.medibuntu.org free non-free'
    apt-add-repository http://extras.ubuntu.com/ubuntu 
    apt-add-repository ppa:user/repository

If --remove is given the tool will remove the given sourceline from your
sources.list
"""
    parser = OptionParser(usage)
    # FIXME: provide a --sources-list-file= option that 
    #        puts the line into a specific file in sources.list.d
    parser.add_option ("-m", "--massive-debug", action="store_true",
        dest="massive_debug", default=False,
        help="Print a lot of debug information to the command line")
    parser.add_option("-r", "--remove", action="store_true",
        dest="remove", default=False,
        help="remove repository from sources.list.d directory")
    parser.add_option("-k", "--keyserver",
        dest="keyserver", default=DEFAULT_KEYSERVER,
        help="URL of keyserver. Default: %default")
    parser.add_option("-y", "--yes", action="store_true",
        dest="assume_yes", default=False,
        help="Assume yes to all queries")
    (options, args) = parser.parse_args()

    if os.geteuid() != 0:
        print _("Error: must run as root")
        sys.exit(1)

    if (len(args) != 1):
        print _("Error: need a repository as argument")
        sys.exit(1)

    # force new ppa file to be 644 (LP: #399709)
    os.umask(0022)

    # get the line
    line = args[0]

    # display PPA info (if needed)
    if line.startswith("ppa:") and not options.assume_yes:
        from softwareproperties.ppa import get_ppa_info_from_lp, LAUNCHPAD_PPA_API
        user, sep, ppa_name = line.split(":")[1].partition("/")
        ppa_name = ppa_name or "ppa"
        try:
            ppa_info = get_ppa_info_from_lp(user, ppa_name)
        except HTTPError:
            print _("Cannot add PPA: '%s'.") % line
            if user.startswith("~"):
                print _("Did you mean 'ppa:%s/%s' ?" %(user[1:], ppa_name))
                sys.exit(1) # Exit because the user cannot be correct
            # If the PPA does not exist, then try to find if the user/team 
            # exists. If it exists, list down the PPAs
            _maybe_suggest_ppa_name_based_on_user(user)
            sys.exit(1)
        except (ValueError, URLError):
            print _("Cannot access PPA (%s) to get PPA information, "
                    "please check your internet connection.") % \
                (LAUNCHPAD_PPA_API % (user, ppa_name))
            sys.exit(1)
        # private PPAs are not supported
        if "private" in ppa_info and ppa_info["private"]:
            print _("Adding private PPAs is not supported currently")
            sys.exit(1)
        
        if options.remove:
            print _("You are about to remove the following PPA from your system:")
        else:
            print _("You are about to add the following PPA to your system:")
        print " %s" % utf8(ppa_info["description"] or "")
        print _(" More info: %s") % ppa_info["web_link"]
        if (sys.stdin.isatty() and
            not "FORCE_ADD_APT_REPOSITORY" in os.environ):
            if options.remove:
                print _("Press [ENTER] to continue or ctrl-c to cancel removing it")
            else:
                print _("Press [ENTER] to continue or ctrl-c to cancel adding it")
            sys.stdin.readline()

    # add it
    sp = SoftwareProperties(options=options)
    if options.remove:
        (line, file) = expand_ppa_line(line.strip(), sp.distro.codename)
        deb_line = sp.expand_http_line(line)
        debsrc_line = 'deb-src' + deb_line[3:]
        deb_entry = SourceEntry(deb_line, file)
        debsrc_entry = SourceEntry(debsrc_line, file)
        try:
            sp.remove_source(deb_entry)
        except ValueError:
            print _("Error: '%s' doesn't exist in a sourcelist file" % deb_line)
        try:
            sp.remove_source(debsrc_entry)
        except ValueError:
            print _("Error: '%s' doesn't exist in a sourcelist file" % debsrc_line)

    else:
        if not sp.add_source_from_line(line):
            print _("Error: '%s' invalid" % line)
            sys.exit(1)
        sp.sourceslist.save()