from bootstrapvz.base import Task
from .. import phases
from ..tools import log_check_call
from . import assets
import os.path


class InstallInitScripts(Task):
    description = 'Installing startup scripts'
    phase = phases.system_modification

    @classmethod
    def run(cls, info):
        import stat
        rwxr_xr_x = (stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR |
                     stat.S_IRGRP                | stat.S_IXGRP |
                     stat.S_IROTH                | stat.S_IXOTH)
        from shutil import copy
        for name, src in info.initd['install'].iteritems():
            dst = os.path.join(info.root, 'etc/init.d', name)
            copy(src, dst)
            os.chmod(dst, rwxr_xr_x)
            log_check_call(['chroot', info.root, 'insserv', '--default', name])

        for name in info.initd['disable']:
            log_check_call(['chroot', info.root, 'insserv', '--remove', name])


class AddExpandRoot(Task):
    description = 'Adding init script to expand the root volume'
    phase = phases.system_modification
    successors = [InstallInitScripts]

    @classmethod
    def run(cls, info):
        init_scripts_dir = os.path.join(assets, 'init.d')
        info.initd['install']['expand-root'] = os.path.join(init_scripts_dir, 'expand-root')


class RemoveHWClock(Task):
    description = 'Removing hardware clock init scripts'
    phase = phases.system_modification
    successors = [InstallInitScripts]

    @classmethod
    def run(cls, info):
        from bootstrapvz.common.releases import squeeze
        info.initd['disable'].append('hwclock.sh')
        if info.manifest.release == squeeze:
            info.initd['disable'].append('hwclockfirst.sh')


class AdjustExpandRootScript(Task):
    description = 'Adjusting the expand-root script'
    phase = phases.system_modification
    predecessors = [InstallInitScripts]

    @classmethod
    def run(cls, info):
        from ..tools import sed_i
        script = os.path.join(info.root, 'etc/init.d/expand-root')

        root_idx = info.volume.partition_map.root.get_index()
        root_index_line = 'root_index="{idx}"'.format(idx=root_idx)
        sed_i(script, '^root_index="0"$', root_index_line)

        root_device_path = 'root_device_path="{device}"'.format(device=info.volume.device_path)
        sed_i(script, '^root_device_path="/dev/xvda"$', root_device_path)


class AdjustGrowpartWorkaround(Task):
    description = 'Adjusting expand-root for growpart-workaround'
    phase = phases.system_modification
    predecessors = [AdjustExpandRootScript]

    @classmethod
    def run(cls, info):
        from ..tools import sed_i
        script = os.path.join(info.root, 'etc/init.d/expand-root')
        sed_i(script, '^growpart="growpart"$', 'growpart-workaround')