# Copyright (C) 2006, 2007, 2009, 2010 Canonical Ltd
#
# 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 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Tests for lock-breaking user interface"""

from bzrlib import (
    branch,
    bzrdir,
    config,
    errors,
    osutils,
    tests,
    )
from bzrlib.tests.matchers import ContainsNoVfsCalls
from bzrlib.tests.script import (
    run_script,
    )


class TestBreakLock(tests.TestCaseWithTransport):

    # General principal for break-lock: All the elements that might be locked
    # by a bzr operation on PATH, are candidates that break-lock may unlock.
    # so pathologically if we have a lightweight checkout A, of branch B, which
    # is bound to location C, the following things should be checked for locks
    # to break:
    # wt = WorkingTree(A)
    # wt.branch
    # wt.branch.repository
    # wt.branch.get_master_branch()
    # wt.branch.get_master_branch().repository
    # so for smoke tests all we need is a bound branch with a checkout of that
    # and we can then use different urls to test individual cases, for as much
    # granularity as needed.

    def setUp(self):
        super(TestBreakLock, self).setUp()
        self.build_tree(
            ['master-repo/',
             'master-repo/master-branch/',
             'repo/',
             'repo/branch/',
             'checkout/'])
        bzrdir.BzrDir.create('master-repo').create_repository()
        self.master_branch = bzrdir.BzrDir.create_branch_convenience(
            'master-repo/master-branch')
        bzrdir.BzrDir.create('repo').create_repository()
        local_branch = bzrdir.BzrDir.create_branch_convenience('repo/branch')
        local_branch.bind(self.master_branch)
        checkoutdir = bzrdir.BzrDir.create('checkout')
        checkoutdir.set_branch_reference(local_branch)
        self.wt = checkoutdir.create_workingtree()

    def test_break_lock_help(self):
        out, err = self.run_bzr('break-lock --help')
        # shouldn't fail and should not produce error output
        self.assertEqual('', err)

    def test_break_lock_no_interaction(self):
        """With --force, the user isn't asked for confirmation"""
        self.master_branch.lock_write()
        run_script(self, """
        $ bzr break-lock --force master-repo/master-branch
        Broke lock ...master-branch/.bzr/...
        """)
        # lock should now be dead
        self.assertRaises(errors.LockBroken, self.master_branch.unlock)

    def test_break_lock_everything_locked(self):
        ### if everything is locked, we should be able to unlock the lot.
        # however, we dont test breaking the working tree because we
        # cannot accurately do so right now: the dirstate lock is held
        # by an os lock, and we need to spawn a separate process to lock it
        # then kill -9 it.
        # sketch of test:
        # lock most of the dir:
        self.wt.branch.lock_write()
        self.master_branch.lock_write()
        # run the break-lock
        # we need 5 yes's - wt, branch, repo, bound branch, bound repo.
        self.run_bzr('break-lock checkout', stdin="y\ny\ny\ny\n")
        # a new tree instance should be lockable
        br = branch.Branch.open('checkout')
        br.lock_write()
        br.unlock()
        # and a new instance of the master branch
        mb = br.get_master_branch()
        mb.lock_write()
        mb.unlock()
        self.assertRaises(errors.LockBroken, self.wt.unlock)
        self.assertRaises(errors.LockBroken, self.master_branch.unlock)


class TestConfigBreakLock(tests.TestCaseWithTransport):

    def setUp(self):
        super(TestConfigBreakLock, self).setUp()
        self.config_file_name = './my.conf'
        self.build_tree_contents([(self.config_file_name,
                                   '[DEFAULT]\none=1\n')])
        self.config = config.LockableConfig(file_name=self.config_file_name)
        self.config.lock_write()

    def test_create_pending_lock(self):
        self.addCleanup(self.config.unlock)
        self.assertTrue(self.config._lock.is_held)

    def test_break_lock(self):
        self.run_bzr('break-lock --config %s'
                     % osutils.dirname(self.config_file_name),
                     stdin="y\n")
        self.assertRaises(errors.LockBroken, self.config.unlock)


class TestSmartServerBreakLock(tests.TestCaseWithTransport):

    def test_simple_branch_break_lock(self):
        self.setup_smart_server_with_call_log()
        t = self.make_branch_and_tree('branch')
        t.branch.lock_write()
        self.reset_smart_call_log()
        out, err = self.run_bzr(['break-lock', '--force', self.get_url('branch')])
        # This figure represent the amount of work to perform this use case. It
        # is entirely ok to reduce this number if a test fails due to rpc_count
        # being too low. If rpc_count increases, more network roundtrips have
        # become necessary for this use case. Please do not adjust this number
        # upwards without agreement from bzr's network support maintainers.
        self.assertThat(self.hpss_calls, ContainsNoVfsCalls)
        self.assertLength(1, self.hpss_connections)
        self.assertLength(5, self.hpss_calls)
