# archival.py - revision archival for mercurial

#

# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from i18n import _

from node import hex

import cmdutil

import util

import cStringIO, os, stat, tarfile, time, zipfile

import zlib, gzip

def tidyprefix(dest, kind, prefix):

    '''choose prefix to use for names in archive.  make sure prefix is

    safe for consumers.'''

    if prefix:

        prefix = util.normpath(prefix)

    else:

        if not isinstance(dest, str):

            raise ValueError('dest must be string if no prefix')

        prefix = os.path.basename(dest)

        lower = prefix.lower()

        for sfx in exts.get(kind, []):

            if lower.endswith(sfx):

                prefix = prefix[:-len(sfx)]

                break

    lpfx = os.path.normpath(util.localpath(prefix))

    prefix = util.pconvert(lpfx)

    if not prefix.endswith('/'):

        prefix += '/'

    if prefix.startswith('../') or os.path.isabs(lpfx) or '/../' in prefix:

        raise util.Abort(_('archive prefix contains illegal components'))

    return prefix

exts = {

    'tar': ['.tar'],

    'tbz2': ['.tbz2', '.tar.bz2'],

    'tgz': ['.tgz', '.tar.gz'],

    'zip': ['.zip'],

    }

def guesskind(dest):

    for kind, extensions in exts.iteritems():

        if util.any(dest.endswith(ext) for ext in extensions):

            return kind

    return None

class tarit(object):

    '''write archive to tar file or stream.  can write uncompressed,

    or compress with gzip or bzip2.'''

    class GzipFileWithTime(gzip.GzipFile):

        def __init__(self, *args, **kw):

            timestamp = None

            if 'timestamp' in kw:

                timestamp = kw.pop('timestamp')

            if timestamp is None:

                self.timestamp = time.time()

            else:

                self.timestamp = timestamp

            gzip.GzipFile.__init__(self, *args, **kw)

        def _write_gzip_header(self):

            self.fileobj.write('\037\213')             # magic header

            self.fileobj.write('\010')                 # compression method

            # Python 2.6 deprecates self.filename

            fname = getattr(self, 'name', None) or self.filename

            if fname and fname.endswith('.gz'):

                fname = fname[:-3]

            flags = 0

            if fname:

                flags = gzip.FNAME

            self.fileobj.write(chr(flags))

            gzip.write32u(self.fileobj, long(self.timestamp))

            self.fileobj.write('\002')

            self.fileobj.write('\377')

            if fname:

                self.fileobj.write(fname + '\000')

    def __init__(self, dest, mtime, kind=''):

        self.mtime = mtime

        def taropen(name, mode, fileobj=None):

            if kind == 'gz':

                mode = mode[0]

                if not fileobj:

                    fileobj = open(name, mode + 'b')

                gzfileobj = self.GzipFileWithTime(name, mode + 'b',

                                                  zlib.Z_BEST_COMPRESSION,

                                                  fileobj, timestamp=mtime)

                return tarfile.TarFile.taropen(name, mode, gzfileobj)

            else:

                return tarfile.open(name, mode + kind, fileobj)

        if isinstance(dest, str):

            self.z = taropen(dest, mode='w:')

        else:

            # Python 2.5-2.5.1 have a regression that requires a name arg

            self.z = taropen(name='', mode='w|', fileobj=dest)

    def addfile(self, name, mode, islink, data):

        i = tarfile.TarInfo(name)

        i.mtime = self.mtime

        i.size = len(data)

        if islink:

            i.type = tarfile.SYMTYPE

            i.mode = 0777

            i.linkname = data

            data = None

            i.size = 0

        else:

            i.mode = mode

            data = cStringIO.StringIO(data)

        self.z.addfile(i, data)

    def done(self):

        self.z.close()

class tellable(object):

    '''provide tell method for zipfile.ZipFile when writing to http

    response file object.'''

    def __init__(self, fp):

        self.fp = fp

        self.offset = 0

    def __getattr__(self, key):

        return getattr(self.fp, key)

    def write(self, s):

        self.fp.write(s)

        self.offset += len(s)

    def tell(self):

        return self.offset

class zipit(object):

    '''write archive to zip file or stream.  can write uncompressed,

    or compressed with deflate.'''

    def __init__(self, dest, mtime, compress=True):

        if not isinstance(dest, str):

            try:

                dest.tell()

            except (AttributeError, IOError):

                dest = tellable(dest)

        self.z = zipfile.ZipFile(dest, 'w',

                                 compress and zipfile.ZIP_DEFLATED or

                                 zipfile.ZIP_STORED)

        # Python's zipfile module emits deprecation warnings if we try

        # to store files with a date before 1980.

        epoch = 315532800 # calendar.timegm((1980, 1, 1, 0, 0, 0, 1, 1, 0))

        if mtime < epoch:

            mtime = epoch

        self.date_time = time.gmtime(mtime)[:6]

    def addfile(self, name, mode, islink, data):

        i = zipfile.ZipInfo(name, self.date_time)

        i.compress_type = self.z.compression

        # unzip will not honor unix file modes unless file creator is

        # set to unix (id 3).

        i.create_system = 3

        ftype = stat.S_IFREG

        if islink:

            mode = 0777

            ftype = stat.S_IFLNK

        i.external_attr = (mode | ftype) << 16L

        self.z.writestr(i, data)

    def done(self):

        self.z.close()

class fileit(object):

    '''write archive as files in directory.'''

    def __init__(self, name, mtime):

        self.basedir = name

        self.opener = util.opener(self.basedir)

    def addfile(self, name, mode, islink, data):

        if islink:

            self.opener.symlink(data, name)

            return

        f = self.opener(name, "w", atomictemp=True)

        f.write(data)

        f.rename()

        destfile = os.path.join(self.basedir, name)

        os.chmod(destfile, mode)

    def done(self):

        pass

archivers = {

    'files': fileit,

    'tar': tarit,

    'tbz2': lambda name, mtime: tarit(name, mtime, 'bz2'),

    'tgz': lambda name, mtime: tarit(name, mtime, 'gz'),

    'uzip': lambda name, mtime: zipit(name, mtime, False),

    'zip': zipit,

    }

def archive(repo, dest, node, kind, decode=True, matchfn=None,

            prefix=None, mtime=None, subrepos=False):

    '''create archive of repo as it was at node.

    dest can be name of directory, name of archive file, or file

    object to write archive to.

    kind is type of archive to create.

    decode tells whether to put files through decode filters from

    hgrc.

    matchfn is function to filter names of files to write to archive.

    prefix is name of path to put before every archive member.'''

    if kind == 'files':

        if prefix:

            raise util.Abort(_('cannot give prefix when archiving to files'))

    else:

        prefix = tidyprefix(dest, kind, prefix)

    def write(name, mode, islink, getdata):

        if matchfn and not matchfn(name):

            return

        data = getdata()

        if decode:

            data = repo.wwritedata(name, data)

        archiver.addfile(prefix + name, mode, islink, data)

    if kind not in archivers:

        raise util.Abort(_("unknown archive type '%s'") % kind)

    ctx = repo[node]

    archiver = archivers[kind](dest, mtime or ctx.date()[0])

    if repo.ui.configbool("ui", "archivemeta", True):

        def metadata():

            base = 'repo: %s\nnode: %s\nbranch: %s\n' % (

                repo[0].hex(), hex(node), ctx.branch())

            tags = ''.join('tag: %s\n' % t for t in ctx.tags()

                           if repo.tagtype(t) == 'global')

            if not tags:

                repo.ui.pushbuffer()

                opts = {'template': '{latesttag}\n{latesttagdistance}',

                        'style': '', 'patch': None, 'git': None}

                cmdutil.show_changeset(repo.ui, repo, opts).show(ctx)

                ltags, dist = repo.ui.popbuffer().split('\n')

                tags = ''.join('latesttag: %s\n' % t for t in ltags.split(':'))

                tags += 'latesttagdistance: %s\n' % dist

            return base + tags

        write('.hg_archival.txt', 0644, False, metadata)

    for f in ctx:

        ff = ctx.flags(f)

        write(f, 'x' in ff and 0755 or 0644, 'l' in ff, ctx[f].data)

    if subrepos:

        for subpath in ctx.substate:

            sub = ctx.sub(subpath)

            sub.archive(archiver, prefix)

    archiver.done()