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#!/usr/bin/python3
# vim:set fileencoding=utf-8 et ts=4 sts=4 sw=4:
# This file is shared between postinst and config
import configparser
import os
import shutil
import sys
import debconf
PREFIX_SIZE = len('apt-listchanges/')
DEFAULT_SEEN_DB = '/var/lib/apt/listchanges'
SECTION = 'apt'
previous_version = ''
# See the comment at the top of snapshot.py
snapshots_wanted = False
DO_SNAPSHOTS_OPTION = 'capture_snapshots'
SNAPSHOT_DIR_OPTION = 'snapshot_dir'
DEFAULT_SNAPSHOT_DIR = os.path.join(os.path.dirname(DEFAULT_SEEN_DB),
'listchanges-snapshots')
def _tmpl2Key(name):
return name[PREFIX_SIZE:].replace('-', '_')
def _debug(*args):
if 'APT_LISTCHANGES_DEBCONF_DEBUG' in os.environ:
print(*args, file=sys.stderr)
def _handleString(cfgkey, config, template, db, fromConfig):
_debug("handleString(", template, cfgkey, fromConfig, ")")
if fromConfig:
value = config.get(SECTION, cfgkey)
if value == 'none':
value = ''
db.set(template, value)
else:
value = db.getString(template)
if value == '':
value = 'none'
config.set(SECTION, cfgkey, value)
def _handleList(cfgkey, config, template, db, fromConfig):
_debug("handleList(", template, cfgkey, fromConfig, ")")
if fromConfig:
value = config.get(SECTION, cfgkey)
db.set(template, value.lower())
else:
value = db.getString(template)
config.set(SECTION, cfgkey, value)
def _handleBoolean(cfgkey, config, template, db, fromConfig):
value = config.getboolean(SECTION, cfgkey, fallback=None)
_debug("handleBoolean(", template, cfgkey, fromConfig,
"), old config value:", value)
if fromConfig:
db.set(template, str(value).lower())
else:
newvalue = db.getBoolean(template)
if value is None or value != newvalue:
config.set(SECTION, cfgkey, str(newvalue).lower())
def _handleSeen(cfgkey, config, template, db, fromConfig):
# The 'save-seen' is very special: a path in config file,
# but in debconf is stored as boolean...
value = config.get(SECTION, cfgkey, fallback=None)
_debug("handleSeen(", template, cfgkey, fromConfig,
"), old config value:", value)
if fromConfig:
db.set(template, str(value and value != 'none').lower())
elif not db.getBoolean(template):
value = 'none'
elif not value or value == 'none':
value = DEFAULT_SEEN_DB
if previous_version and previous_version < '4.0' and value.endswith('.db'):
value = value[:-3]
config.set(SECTION, cfgkey, value)
IDX_QUESTION_NUMBER = 0
IDX_PRIORITY = 1
IDX_HANDLER = 2
IDX_SKIP = 3
IDX_CHECK = 4
def _checkFrontend(frontend):
if frontend == 'none':
return True
NAMES['apt-listchanges/confirm'][IDX_SKIP] = frontend == 'mail'
return False
def _checkWhich(which):
NAMES['apt-listchanges/no-network'][IDX_SKIP] = which == 'news'
return False
def _checkEmailAddress(emailAddress):
NAMES['apt-listchanges/email-format'][IDX_SKIP] = not emailAddress
return False
NAMES = {'apt-listchanges/frontend' : [1, debconf.MEDIUM, _handleList, False, _checkFrontend],
'apt-listchanges/which' : [2, debconf.MEDIUM, _handleList, False, _checkWhich],
'apt-listchanges/no-network' : [3, debconf.HIGH, _handleBoolean, False, None],
'apt-listchanges/email-address': [4, debconf.LOW, _handleString, False, _checkEmailAddress],
'apt-listchanges/email-format' : [5, debconf.LOW, _handleList, False, None],
'apt-listchanges/confirm' : [6, debconf.LOW, _handleBoolean, False, None],
'apt-listchanges/headers' : [7, debconf.LOW, _handleBoolean, False, None],
'apt-listchanges/reverse' : [8, debconf.LOW, _handleBoolean, False, None],
'apt-listchanges/save-seen' : [9, debconf.LOW, _handleSeen, False, None]
}
def _updateDebconfFromConfig(config, db):
_debug("updateDebconfFromConfig()")
for tmpl, params in NAMES.items(): # don't need to be sorted
cfgkey = _tmpl2Key(tmpl)
if config.has_option(SECTION, cfgkey):
params[IDX_HANDLER](cfgkey, config, tmpl, db, True)
db.fset(tmpl, 'seen', 'true')
def _communicateWithDebconf(config, db, is_postinst):
_debug("communicateWithDebconf(", is_postinst, ")")
for tmpl, params in sorted(NAMES.items(),
key=lambda x : x[1][IDX_QUESTION_NUMBER]):
if params[IDX_SKIP]:
_debug(f"skipping {tmpl}")
continue
if is_postinst: # store the value
params[IDX_HANDLER](_tmpl2Key(tmpl), config, tmpl, db, False)
else: # ask for the value
db.forceInput(params[IDX_PRIORITY], tmpl)
if params[IDX_CHECK]:
db.go()
if params[IDX_CHECK]:
value = db.get(tmpl)
if params[IDX_CHECK](value):
_debug(f"finishing on {tmpl}")
return
if not is_postinst:
db.go()
def main(argv):
global previous_version # pylint: disable=global-statement
if len(argv) < 3:
print("Usage: script postinst|config config_file mainscript_params",
file=sys.stderr)
sys.exit(1)
debconf.runFrontEnd()
is_postinst = argv[1] == 'postinst' # otherwise it is config
config_file = argv[2]
previous_version = argv[3]
_debug("apt-listchanges debconf script started(",
is_postinst, config_file, ")")
config = configparser.ConfigParser()
config.read(config_file)
if not config.has_section(SECTION):
config.add_section(SECTION)
try:
output = os.fdopen(3, "wt")
except Exception as ex:
_debug("failed to open file descriptor 3", str(ex))
output = sys.stdout
db = debconf.Debconf(write=output)
if not is_postinst:
_updateDebconfFromConfig(config, db)
_communicateWithDebconf(config, db, is_postinst)
if snapshots_wanted:
if not config.has_option(SECTION, DO_SNAPSHOTS_OPTION):
config.set(SECTION, DO_SNAPSHOTS_OPTION, 'auto')
if not config.has_option(SECTION, SNAPSHOT_DIR_OPTION):
config.set(SECTION, SNAPSHOT_DIR_OPTION,
os.path.join(os.path.dirname(DEFAULT_SEEN_DB),
DEFAULT_SNAPSHOT_DIR))
elif config.get(SECTION, DO_SNAPSHOTS_OPTION, fallback=None) == 'auto':
config.remove_option(SECTION, DO_SNAPSHOTS_OPTION)
snapshot_dir = config.get(SECTION, SNAPSHOT_DIR_OPTION, fallback=None)
if snapshot_dir:
shutil.rmtree(snapshot_dir, ignore_errors=True)
config.remove_option(SECTION, SNAPSHOT_DIR_OPTION)
if is_postinst:
with open(config_file + '.new', 'w', encoding='utf-8') as newfile:
config.write(newfile, space_around_delimiters=False)
os.fchmod(newfile.fileno(), 0o644)
if __name__ == "__main__":
main(sys.argv)
sys.exit(0)
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