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#!/usr/bin/python
# Create/update debian packaging from a Python .egg-info
# Copyright (C) 2009 Canonical Ltd.
# Author: Martin Pitt
# License: GPL v2 or later

from optparse import OptionParser
import subprocess, tempfile, shutil, sys, os, textwrap

sys.path.insert(0, '.')
from DistUtilsExtra import __version__ as pkgversion

def get_egg_info():
    '''Get egg information from ./setup.py into a dictionary.'''

    if not os.path.isfile('setup.py'):
        print >> sys.stderr, 'No setup.py in current directory'
        sys.exit(1)

    egg = {}
    instdir = tempfile.mkdtemp()
    try:
        result = subprocess.call(['python', 'setup.py', 'install_egg_info', '-d', instdir])
        if result != 0:
            print >> sys.stderr, 'setup.py install_egg_info failed'
            sys.exit(1)

        ls = os.listdir(instdir)
        if len(ls) != 1 or not os.path.isfile(os.path.join(instdir, ls[0])) or \
                not ls[0].endswith('.egg-info'):
            print >> sys.stderr, './setup.py install_egg_info did not generate an .egg-info file'
            sys.exit(1)

        for l in open(os.path.join(instdir, ls[0])):
            k, v = l.strip().split(': ', 1)
            if k in ['Requires', 'Provides']:
                # multi-value fields
                egg.setdefault(k, []).append(v)
            else:
                if k in egg:
                    print >> sys.stderr, 'WARNING: duplicate field %s in .egg-info' % k
                egg[k] = v

        return egg
    finally:
        shutil.rmtree(instdir)

def make_debian(egg, force_control, changelog, additional_dependencies,
                distribution, use_old_changelog, force_copyright, 
                force_rules, prefix):
    '''Create/update debian/* from information in egg dictionary'''

    if not os.path.isdir('debian'):
        os.mkdir('debian')

    if not os.path.exists('debian/compat'):
        f = open('debian/compat', 'w')
        f.write('8\n')
        f.close()

    prefix_string = ''
    if prefix:
        prefix_string = '''override_dh_auto_install:
	dh_auto_install -- --install-scripts=%s \
                --install-data=%s \
                --install-lib=%s

override_dh_python2:
	dh_python2 %s
''' % (prefix, prefix, prefix, prefix)

    if not os.path.exists('debian/rules') or force_rules:
        f = open('debian/rules', 'w')
        f.write('''#!/usr/bin/make -f
%%:
ifneq ($(shell dh -l | grep -xF translations),)
	dh $@ --with python2,translations
else
	dh $@ --with python2
endif

%s
''' % prefix_string)
        f.close()
        os.chmod('debian/rules', 0755)

    if not os.path.exists('debian/copyright') or force_copyright:
        make_copyright(egg)
    if force_control not in ('none', 'deps', 'full'):
        print >> sys.stderr, 'ERROR: --force-control takes one of the following options:\n' \
            '"none", "deps", or "full"'
        sys.exit(0)
    if force_control != 'none':
        make_control(egg, force_control, additional_dependencies)
    make_changelog(egg, changelog, distribution, use_old_changelog)

def make_copyright(egg):
    author = egg.get('Author', '')
    if 'Author-email' in egg:
        author += ' <' + egg['Author-email'] + '>'

    f = open('debian/copyright', 'w')
    f.write('''Format-Specification: http://svn.debian.org/wsvn/dep/web/deps/dep5.mdwn?op=file&rev=135
Name: %s
Maintainer: %s
''' % (egg['Name'], author))
    if 'Home-page' in egg:
        print >> f, 'Source:', egg['Home-page']

    print >> f, '\nFiles: *'

    cgrep = subprocess.Popen("find -type f ! -name 'COPYING*' ! -name LICENSE !  -name '*.pyc' ! -path '*/.*' ! -path './debian/*' ! -name '*.pot' | xargs grep -hi '(c)' | sed 's/^.*([cC])/Copyright: (C)/' | sort -u",
            shell=True, stdout=subprocess.PIPE)
    out = cgrep.communicate()[0]
    assert cgrep.returncode == 0
    f.write(out)

    if 'License' in egg:
        print >> f, 'License:', egg['License']
        if 'gpl' in egg['License'].lower():
            if '2' in egg['License']:
                l = 'GPL-2'
            elif '3' in egg['License']:
                l = 'GPL-3'
            else:
                l = 'GPL'
            print >> f, ''' The full text of the GPL is distributed in
 /usr/share/common-licenses/%s on Debian systems.''' % l

def make_control(egg, force_control, additional_dependencies):
    author = egg.get('Author', '')
    if 'Author-email' in egg:
        author += ' <' + egg['Author-email'] + '>'

    # calculate dependencies
    print 'Searching packages which provide required Python modules:'
    deps = set()
    for m in egg.get('Requires', []):
        print '  ', m, '...',
        p = mod2package(m)
        if p:
            deps.add(p)
            print p
        else:
            print '[not found]'
 
    # calculate extra build dependencies
    bdeps = ''
    if subprocess.call('find -name "*.ui" | xargs grep -q \'<widget class="Q\'', 
            shell=True) == 0:
        print 'Package uses KDE *.ui files, adding python-kde4-dev build dependency'
        bdeps += ',\n python-kde4-dev'

    # prepare tags
    control_content = {'Depends': '''${misc:Depends},
 ${python:Depends}%s''' % ',\n '.join(['',] + list(deps) + additional_dependencies)
    }
    # add additional fields (even when updating if user chooses them)
    if not os.path.exists('debian/control') or force_control == 'full':
        control_content.update({
        'Source': egg['Name'],
        'Build-Depends': '''cdbs (>= 0.4.43),
 debhelper (>= 6),
 python (>= 2.6.6-3~),
 python-distutils-extra (>= 2.10)%s''' % bdeps,
        'Maintainer': author,
        'Package': egg['Name'],
        'Description' : egg.get('Summary', '') + '\n '.join(['',] + list(textwrap.wrap(egg.get('Description', ''), 72)))
    })

    if not os.path.exists('debian/control'):
        f = open('debian/control', 'w')
        f.write('''Source: %(Source)s
Section: python
Priority: extra
Build-Depends: %(Build-Depends)s
Maintainer: %(Maintainer)s
Standards-Version: 3.8.3
XS-Python-Version: current

Package: %(Package)s
Architecture: all
XB-Python-Version: ${python:Versions}
Depends: %(Depends)s
Description: %(Description)s
''' % control_content)
        f.close()
    else:
        #  update debian/control
        in_ = open('debian/control')
        out = open('debian/control.new', 'w')
        skip_until_new_key = False
        try:
            for line in in_:
                # toggle the switch to off if we encounter a new key not overwritten
                if not line.startswith(' '):
                    skip_until_new_key = False

                for controlkey in control_content:
                    if line.startswith(controlkey):
                        # skip old values and write our own
                        out.write('%s: %s\n' % (controlkey, control_content[controlkey]))
                        skip_until_new_key = True
                        break

                # write current line if not in a overwritten section
                if not skip_until_new_key:
                    out.write(line)

            out.close()
            in_.close()
        except:
            os.unlink('debian/control.new')
            raise
        os.rename('debian/control.new', 'debian/control')

def make_changelog(egg, changelog, distribution, use_old_changelog):
    command = ['debchange']
    if not distribution:
        lsb_release = subprocess.Popen(['lsb_release', '-si'],
                stdout=subprocess.PIPE)
        distro = lsb_release.communicate()[0].strip()
        assert lsb_release.returncode == 0

        if distro == 'Debian':
            release = 'unstable'
        else:
            lsb_release = subprocess.Popen(['lsb_release', '-sc'],
                    stdout=subprocess.PIPE)
            release = lsb_release.communicate()[0].strip()
            assert lsb_release.returncode == 0
    else:
        release = distribution
        # Use --force-distribution only if distribution specified by user
        command.append('--force-distribution')

    command.append('-D' + release)

    if not os.path.exists('/usr/bin/debchange'):
        print >> sys.stderr, 'ERROR: Could not find "debchange".\n' \
            'You need to install the "devscripts" package for this.'
        sys.exit(0)

    if not os.path.exists('debian/changelog'):
        if not changelog:
            changelog = ['Initial release.']
        try:
            command.extend(['--create', '--package', egg['Name'], 
                '-v' + egg['Version'], changelog[0]])
            assert subprocess.call(command) == 0
        except OSError, e:
            print >> sys.stderr, 'ERROR: Could not run "debchange": %s\n' \
                'You need to install the "devscripts" package for this.' % str(e)
            sys.exit(0)
    else:
        if not changelog:
            changelog = use_old_changelog and [''] or ['New release.']
        if not use_old_changelog:
            command.append('-v' + egg['Version'])
        command.append(changelog[0])

        if (subprocess.call(command, stderr=subprocess.PIPE) != 0):
            print >> sys.stderr, "Can\'t update changelog."
            sys.exit(1)
    for message in changelog[1:]:
        subprocess.call(['debchange', message])

def mod2package(module):
    '''Convert Python module into a package name.

    This can return None if the package name cannot be determined.
    '''

    # first attempt: python-<modulename> (common case)
    package = 'python-' + module.split('.')[0].lower()
    dpkg = subprocess.Popen(['dpkg', '-L', package], stdout=subprocess.PIPE,
            stderr=subprocess.PIPE)
    out = dpkg.communicate()[0]
    if dpkg.returncode == 0 and \
       ('/%s/__init__.py\n' % module.replace('.', '/') in out or \
        '/%s.py\n' % module.replace('.', '/') in out):
        return package

    # try for gi modules
    if module.startswith('gi.repository.'):
        module_name = module.split('.')[-1]
        try:
            _module = __import__(module, fromlist=[module_name])
        except RuntimeError: # thrown by Gtk without $DISPLAY
            print '[cannot import, ignoring]',
            return None
        pkg = _get_pkg_from_path(_module.__path__)
        if pkg:
            return pkg
    # bigger hammer: dpkg -S for Python packages
    # module can be module.submodule.subsubmodule packaged independently
    # (e. g. python-desktopcouch and python-desktopcouch-records)
    module_name = module.split('.')
    while(module_name):
        pkg = _get_pkg_from_path('*/%s/__init__.py' % '/'.join(module_name))
        if pkg:
            return pkg
        module_name = module_name[:-1]

    # bigger hammer: dpkg -S for compiled extensions
    dpkg = subprocess.Popen(['dpkg', '-S', '*/%s.so' % module.replace('.', '/')], 
            stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out = dpkg.communicate()[0]
    pkgs = set()
    for line in out.splitlines():
        p = line.split(':')[0]
        # ignore debug extensions
        if p.endswith('-dbg'):
            continue
        pkgs.add(p)
    if len(pkgs) == 1:
        return list(pkgs)[0]
    elif len(pkgs) > 1:
        print '[dpkg -S found more than one extension: %s; ignoring]' % ', '.join(pkgs),

    return None

def _get_pkg_from_path(path):
    dpkg = subprocess.Popen(['dpkg', '-S', path],
            stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out = dpkg.communicate()[0]
    pkgs = set()
    for line in out.splitlines():
        pkgs.add(line.split(':')[0])
    if len(pkgs) == 1:
        package = list(pkgs)[0]
        return package
    elif len(pkgs) > 1:
        py_pkgs = [p for p in pkgs if p.startswith('python-')]
        if len(py_pkgs) == 1:
            return py_pkgs[0]
        else:
            print '[dpkg -S found more than one package: %s; ignoring]' % ', '.join(pkgs),
    return None

#
# main
#
usage = "usage: %prog [options]"
parser = OptionParser(prog='python_mkdebian', usage=usage, version=pkgversion)
parser.add_option('', '--force-control', dest='force_control', action='store',
                  help='Force control file behaviour. Can be one of "none" (keep unchanged), "deps" (only update dependencies), or "full" (recreate whole file). By default only dependencies will be updated ("deps").')
parser.add_option('', '--force-copyright', dest='force_copyright', action='store_true',
                  help='Force the copyright file to be recreated')
parser.add_option('', '--force-rules', dest='force_rules', action='store_true',
                  help='Force the rules file to be recreated')
parser.add_option('', '--changelog', dest='changelog', action='append',
                  help='Add string changelog to debian/changelog (can be specified multiple times)')
parser.add_option('', '--dependency', dest='dependencies', action='append',
                  help='Add additional debian package dependency (can be specified multiple times)')
parser.add_option('-D', '--distribution', dest='distribution', action='store',
                  help='Specify which Debian/Ubuntu distribution should be used in the changelog')
parser.add_option('', '--no-changelog', dest='use_old_changelog', action='store_true',
                  help='Don\'t create a new changelog entry')
parser.add_option('', '--prefix', dest='prefix', action='store',
                  help='Ask to install into a dedicated prefix')
parser.set_defaults(changelog=None, dependencies=[], force_control="deps", distribution=None, use_old_changelog=False, prefix=None)
options, args = parser.parse_args()

# switch stdout to line buffering, for scripts reading our output on the fly
sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 1)

egg = get_egg_info()
make_debian(egg, force_control=options.force_control,
                 changelog=options.changelog,
                 additional_dependencies=options.dependencies,
                 distribution=options.distribution,
                 use_old_changelog=options.use_old_changelog,
                 force_copyright=options.force_copyright,
                 force_rules=options.force_rules,
                 prefix=options.prefix)