from focker.jail import backup_file, \
    jail_fs_create, \
    gen_env_command
import tempfile
import os
import subprocess
from focker.zfs import zfs_mountpoint, \
    zfs_exists, \
    zfs_tag


def test_backup_file():
    with tempfile.TemporaryDirectory() as d:
        fname = os.path.join(d, 'dummy.conf')
        with open(fname, 'w') as f:
            f.write('init')
        nbackups = 10
        for i in range(15):
            backup_file(fname, nbackups=nbackups, chmod=0o640)
            with open(fname, 'w') as f:
                f.write(str(i))

        fname = os.path.join(d, 'dummy.conf')
        with open(fname, 'r') as f:
            assert f.read() == '14'

        for i in range(nbackups):
            fname = os.path.join(d, 'dummy.conf.%d' % i)
            assert os.path.exists(fname)
            with open(fname, 'r') as f:
                if i < 5:
                    assert f.read() == str(i + 9)
                else:
                    assert f.read() == str(i - 1)


def test_jail_fs_create_01():
    subprocess.check_output(['focker', 'image', 'remove', '--force', '-R', 'test-jail-fs-create-01'])
    subprocess.check_output(['focker', 'bootstrap', '--empty', '-t', 'test-jail-fs-create-01'])
    name = jail_fs_create('test-jail-fs-create-01')
    assert zfs_exists(name)
    mountpoint = zfs_mountpoint(name)
    assert os.path.exists(mountpoint)
    with open(os.path.join(mountpoint, 'test.txt'), 'w') as f:
        f.write('test\n')
    assert os.path.exists(os.path.join(mountpoint, 'test.txt'))
    with open(os.path.join(mountpoint, 'test.txt'), 'r') as f:
        assert f.read() == 'test\n'
    subprocess.check_output(['focker', 'image', 'remove', '-R', 'test-jail-fs-create-01'])
    assert not zfs_exists(name)
    assert not os.path.exists(mountpoint)


def test_jail_fs_create_02():
    subprocess.check_output(['focker', 'jail', 'remove', '--force', 'test-jail-fs-create-02'])
    name = jail_fs_create()
    zfs_tag(name, ['test-jail-fs-create-02'])
    assert zfs_exists(name)
    mountpoint = zfs_mountpoint(name)
    assert os.path.exists(mountpoint)
    with open(os.path.join(mountpoint, 'test.txt'), 'w') as f:
        f.write('test\n')
    assert os.path.exists(os.path.join(mountpoint, 'test.txt'))
    with open(os.path.join(mountpoint, 'test.txt'), 'r') as f:
        assert f.read() == 'test\n'
    subprocess.check_output(['focker', 'jail', 'remove', 'test-jail-fs-create-02'])
    assert not zfs_exists(name)
    assert not os.path.exists(mountpoint)


def test_gen_env_command():
    command = gen_env_command('echo $TEST_VARIABLE_1 && echo $TEST_VARIABLE_2',
        {'TEST_VARIABLE_1': 'foo', 'TEST_VARIABLE_2': 'foo bar'})
    assert command == 'export TEST_VARIABLE_1=foo && export TEST_VARIABLE_2=\'foo bar\' && echo $TEST_VARIABLE_1 && echo $TEST_VARIABLE_2'