gnome-keyring-change-passwords 'user|username_value=^gilles$' 'action_url|server=acme.example.com'

#!/usr/bin/env python
import getpass, re, sys
import gnomekeyring

def getpass2(prompt):
    input1 = getpass.getpass(prompt)
    input2 = getpass.getpass('Repeat ' + prompt)
    if input1 != input2:
        raise ValueError, 'password mismatch'
    return input1

def check_conditions(conditions, attributes):
    for (names, regexp) in conditions:
        value = ''
        for name in names:
            if attributes.has_key(name):
                value = attributes[name]
                break
        if not re.search(regexp, value): return False
    return True

def parse_condition_string(arg):
    eq = arg.index('=')
    return arg[:eq].split('|'), re.compile(arg[eq+1:])

def change_passwords(keyring_name, conditions, old_password, new_password):
    '''Change the password in many Gnome Keyring entries to new_password.

Iterate over the keyring keyring_name. Only items matching conditions and where
the current password is old_password are considered. The argument conditions
is a list of elements of the form (names, regexp) where names is a list of
attribute names. An item matches the condition if the value of the first
attribute in names that is present on the item contains a match for regexp.
'''
    all_items = gnomekeyring.list_item_ids_sync(keyring_name)
    for item in all_items:
        attributes = gnomekeyring.item_get_attributes_sync(keyring_name, item)
        if not check_conditions(conditions, attributes): continue
        info = gnomekeyring.item_get_info_sync(keyring_name, item)
        display_name = info.get_display_name()
        if info.get_secret() == old_password:
            print 'changing:', display_name
            info.set_secret(new_password)
            gnomekeyring.item_set_info_sync(keyring_name, item, info)
        else:
            print 'has different password, skipping:', display_name

def change_password_ui(condition_strings):
    conditions = map(parse_condition_string, condition_strings)
    old_password = getpass.getpass('Old password:')
    new_password = getpass2('New password:')
    change_passwords('login', conditions, old_password, new_password)

if __name__ == '__main__':
    if '--help' in sys.argv:
        sys.stdout.write('''Usage: ' + sys.argv[0] + ' [CONDITION...]
Change multiple entries in the Gnome Keyring login keyring.
Prompt for the old and new password. Only entries for which the old password
matches are modified.

''')
    else:
        change_password_ui(sys.argv[1:])