view mercurial/extensions.py @ 30779:38aa1ca97b6a

repair: migrate revlogs during upgrade

Our next step for in-place upgrade is to migrate store data. Revlogs
are the biggest source of data within the store and a store is useless
without them, so we implement their migration first.

Our strategy for migrating revlogs is to walk the store and call
`revlog.clone()` on each revlog. There are some minor complications.

Because revlogs have different storage options (e.g. changelog has
generaldelta and delta chains disabled), we need to obtain the
correct class of revlog so inserted data is encoded properly for its
type.

Various attempts at implementing progress indicators that didn't lead
to frustration from false "it's almost done" indicators were made.

I initially used a single progress bar based on number of revlogs.
However, this quickly churned through all filelogs, got to 99% then
effectively froze at 99.99% when it got to the manifest.

So I converted the progress bar to total revision count. This was a
little bit better. But the manifest was still significantly slower
than filelogs and it took forever to process the last few percent.

I then tried both revision/chunk bytes and raw bytes as the
denominator. This had the opposite effect: because so much data is in
manifests, it would churn through filelogs without showing much
progress. When it got to manifests, it would fill in 90+% of the
progress bar.

I finally gave up having a unified progress bar and instead implemented
3 progress bars: 1 for filelog revisions, 1 for manifest revisions, and
1 for changelog revisions. I added extra messages indicating the total
number of revisions of each so users know there are more progress bars
coming.

I also added extra messages before and after each stage to give extra
details about what is happening. Strictly speaking, this isn't
necessary. But the numbers are impressive. For example, when converting
a non-generaldelta mozilla-central repository, the messages you see are:

   migrating 2475593 total revisions (1833043 in filelogs, 321156 in manifests, 321394 in changelog)
   migrating 1.67 GB in store; 2508 GB tracked data
   migrating 267868 filelogs containing 1833043 revisions (1.09 GB in store; 57.3 GB tracked data)
   finished migrating 1833043 filelog revisions across 267868 filelogs; change in size: -415776 bytes
   migrating 1 manifests containing 321156 revisions (518 MB in store; 2451 GB tracked data)

That "2508 GB" figure really blew me away. I had no clue that the raw
tracked data in mozilla-central was that large. Granted, 2451 GB is in
the manifest and "only" 57.3 GB is in filelogs. But still.

It's worth noting that gratuitous loading of source revlogs in order
to display numbers and progress bars does serve a purpose: it ensures
we can open all source revlogs. We don't want to spend several minutes
copying revlogs only to encounter a permissions error or similar later.

As part of this commit, we also add swapping of the store directory
to the upgrade function. After revlogs are converted, we move the
old store into the backup directory then move the temporary repo's
store into the old store's location. On well-behaved systems, this
should be 2 atomic operations and the window of inconsistency show be
very narrow.

There are still a few improvements to be made to store copying and
upgrading. But this commit gets the bulk of the work out of the way.

# extensions.py - extension handling for mercurial
#
# Copyright 2005-2007 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import imp
import os

from .i18n import (
    _,
    gettext,
)

from . import (
    cmdutil,
    error,
    pycompat,
    util,
)

_extensions = {}
_disabledextensions = {}
_aftercallbacks = {}
_order = []
_builtin = set(['hbisect', 'bookmarks', 'parentrevspec', 'progress', 'interhg',
                'inotify', 'hgcia'])

def extensions(ui=None):
    if ui:
        def enabled(name):
            for format in ['%s', 'hgext.%s']:
                conf = ui.config('extensions', format % name)
                if conf is not None and not conf.startswith('!'):
                    return True
    else:
        enabled = lambda name: True
    for name in _order:
        module = _extensions[name]
        if module and enabled(name):
            yield name, module

def find(name):
    '''return module with given extension name'''
    mod = None
    try:
        mod = _extensions[name]
    except KeyError:
        for k, v in _extensions.iteritems():
            if k.endswith('.' + name) or k.endswith('/' + name):
                mod = v
                break
    if not mod:
        raise KeyError(name)
    return mod

def loadpath(path, module_name):
    module_name = module_name.replace('.', '_')
    path = util.normpath(util.expandpath(path))
    module_name = pycompat.fsdecode(module_name)
    path = pycompat.fsdecode(path)
    if os.path.isdir(path):
        # module/__init__.py style
        d, f = os.path.split(path)
        fd, fpath, desc = imp.find_module(f, [d])
        return imp.load_module(module_name, fd, fpath, desc)
    else:
        try:
            return imp.load_source(module_name, path)
        except IOError as exc:
            if not exc.filename:
                exc.filename = path # python does not fill this
            raise

def _importh(name):
    """import and return the <name> module"""
    mod = __import__(pycompat.sysstr(name))
    components = name.split('.')
    for comp in components[1:]:
        mod = getattr(mod, comp)
    return mod

def _importext(name, path=None, reportfunc=None):
    if path:
        # the module will be loaded in sys.modules
        # choose an unique name so that it doesn't
        # conflicts with other modules
        mod = loadpath(path, 'hgext.%s' % name)
    else:
        try:
            mod = _importh("hgext.%s" % name)
        except ImportError as err:
            if reportfunc:
                reportfunc(err, "hgext.%s" % name, "hgext3rd.%s" % name)
            try:
                mod = _importh("hgext3rd.%s" % name)
            except ImportError as err:
                if reportfunc:
                    reportfunc(err, "hgext3rd.%s" % name, name)
                mod = _importh(name)
    return mod

def _reportimporterror(ui, err, failed, next):
    # note: this ui.debug happens before --debug is processed,
    #       Use --config ui.debug=1 to see them.
    ui.debug('could not import %s (%s): trying %s\n'
             % (failed, err, next))
    if ui.debugflag:
        ui.traceback()

def load(ui, name, path):
    if name.startswith('hgext.') or name.startswith('hgext/'):
        shortname = name[6:]
    else:
        shortname = name
    if shortname in _builtin:
        return None
    if shortname in _extensions:
        return _extensions[shortname]
    _extensions[shortname] = None
    mod = _importext(name, path, bind(_reportimporterror, ui))

    # Before we do anything with the extension, check against minimum stated
    # compatibility. This gives extension authors a mechanism to have their
    # extensions short circuit when loaded with a known incompatible version
    # of Mercurial.
    minver = getattr(mod, 'minimumhgversion', None)
    if minver and util.versiontuple(minver, 2) > util.versiontuple(n=2):
        ui.warn(_('(third party extension %s requires version %s or newer '
                  'of Mercurial; disabling)\n') % (shortname, minver))
        return

    _extensions[shortname] = mod
    _order.append(shortname)
    for fn in _aftercallbacks.get(shortname, []):
        fn(loaded=True)
    return mod

def _runuisetup(name, ui):
    uisetup = getattr(_extensions[name], 'uisetup', None)
    if uisetup:
        uisetup(ui)

def _runextsetup(name, ui):
    extsetup = getattr(_extensions[name], 'extsetup', None)
    if extsetup:
        try:
            extsetup(ui)
        except TypeError:
            if extsetup.func_code.co_argcount != 0:
                raise
            extsetup() # old extsetup with no ui argument

def loadall(ui):
    result = ui.configitems("extensions")
    newindex = len(_order)
    for (name, path) in result:
        if path:
            if path[0] == '!':
                _disabledextensions[name] = path[1:]
                continue
        try:
            load(ui, name, path)
        except KeyboardInterrupt:
            raise
        except Exception as inst:
            if path:
                ui.warn(_("*** failed to import extension %s from %s: %s\n")
                        % (name, path, inst))
            else:
                ui.warn(_("*** failed to import extension %s: %s\n")
                        % (name, inst))
            ui.traceback()

    for name in _order[newindex:]:
        _runuisetup(name, ui)

    for name in _order[newindex:]:
        _runextsetup(name, ui)

    # Call aftercallbacks that were never met.
    for shortname in _aftercallbacks:
        if shortname in _extensions:
            continue

        for fn in _aftercallbacks[shortname]:
            fn(loaded=False)

    # loadall() is called multiple times and lingering _aftercallbacks
    # entries could result in double execution. See issue4646.
    _aftercallbacks.clear()

def afterloaded(extension, callback):
    '''Run the specified function after a named extension is loaded.

    If the named extension is already loaded, the callback will be called
    immediately.

    If the named extension never loads, the callback will be called after
    all extensions have been loaded.

    The callback receives the named argument ``loaded``, which is a boolean
    indicating whether the dependent extension actually loaded.
    '''

    if extension in _extensions:
        callback(loaded=True)
    else:
        _aftercallbacks.setdefault(extension, []).append(callback)

def bind(func, *args):
    '''Partial function application

      Returns a new function that is the partial application of args and kwargs
      to func.  For example,

          f(1, 2, bar=3) === bind(f, 1)(2, bar=3)'''
    assert callable(func)
    def closure(*a, **kw):
        return func(*(args + a), **kw)
    return closure

def _updatewrapper(wrap, origfn, unboundwrapper):
    '''Copy and add some useful attributes to wrapper'''
    wrap.__module__ = getattr(origfn, '__module__')
    wrap.__doc__ = getattr(origfn, '__doc__')
    wrap.__dict__.update(getattr(origfn, '__dict__', {}))
    wrap._origfunc = origfn
    wrap._unboundwrapper = unboundwrapper

def wrapcommand(table, command, wrapper, synopsis=None, docstring=None):
    '''Wrap the command named `command' in table

    Replace command in the command table with wrapper. The wrapped command will
    be inserted into the command table specified by the table argument.

    The wrapper will be called like

      wrapper(orig, *args, **kwargs)

    where orig is the original (wrapped) function, and *args, **kwargs
    are the arguments passed to it.

    Optionally append to the command synopsis and docstring, used for help.
    For example, if your extension wraps the ``bookmarks`` command to add the
    flags ``--remote`` and ``--all`` you might call this function like so:

      synopsis = ' [-a] [--remote]'
      docstring = """

      The ``remotenames`` extension adds the ``--remote`` and ``--all`` (``-a``)
      flags to the bookmarks command. Either flag will show the remote bookmarks
      known to the repository; ``--remote`` will also suppress the output of the
      local bookmarks.
      """

      extensions.wrapcommand(commands.table, 'bookmarks', exbookmarks,
                             synopsis, docstring)
    '''
    assert callable(wrapper)
    aliases, entry = cmdutil.findcmd(command, table)
    for alias, e in table.iteritems():
        if e is entry:
            key = alias
            break

    origfn = entry[0]
    wrap = bind(util.checksignature(wrapper), util.checksignature(origfn))
    _updatewrapper(wrap, origfn, wrapper)
    if docstring is not None:
        wrap.__doc__ += docstring

    newentry = list(entry)
    newentry[0] = wrap
    if synopsis is not None:
        newentry[2] += synopsis
    table[key] = tuple(newentry)
    return entry

def wrapfunction(container, funcname, wrapper):
    '''Wrap the function named funcname in container

    Replace the funcname member in the given container with the specified
    wrapper. The container is typically a module, class, or instance.

    The wrapper will be called like

      wrapper(orig, *args, **kwargs)

    where orig is the original (wrapped) function, and *args, **kwargs
    are the arguments passed to it.

    Wrapping methods of the repository object is not recommended since
    it conflicts with extensions that extend the repository by
    subclassing. All extensions that need to extend methods of
    localrepository should use this subclassing trick: namely,
    reposetup() should look like

      def reposetup(ui, repo):
          class myrepo(repo.__class__):
              def whatever(self, *args, **kwargs):
                  [...extension stuff...]
                  super(myrepo, self).whatever(*args, **kwargs)
                  [...extension stuff...]

          repo.__class__ = myrepo

    In general, combining wrapfunction() with subclassing does not
    work. Since you cannot control what other extensions are loaded by
    your end users, you should play nicely with others by using the
    subclass trick.
    '''
    assert callable(wrapper)

    origfn = getattr(container, funcname)
    assert callable(origfn)
    wrap = bind(wrapper, origfn)
    _updatewrapper(wrap, origfn, wrapper)
    setattr(container, funcname, wrap)
    return origfn

def unwrapfunction(container, funcname, wrapper=None):
    '''undo wrapfunction

    If wrappers is None, undo the last wrap. Otherwise removes the wrapper
    from the chain of wrappers.

    Return the removed wrapper.
    Raise IndexError if wrapper is None and nothing to unwrap; ValueError if
    wrapper is not None but is not found in the wrapper chain.
    '''
    chain = getwrapperchain(container, funcname)
    origfn = chain.pop()
    if wrapper is None:
        wrapper = chain[0]
    chain.remove(wrapper)
    setattr(container, funcname, origfn)
    for w in reversed(chain):
        wrapfunction(container, funcname, w)
    return wrapper

def getwrapperchain(container, funcname):
    '''get a chain of wrappers of a function

    Return a list of functions: [newest wrapper, ..., oldest wrapper, origfunc]

    The wrapper functions are the ones passed to wrapfunction, whose first
    argument is origfunc.
    '''
    result = []
    fn = getattr(container, funcname)
    while fn:
        assert callable(fn)
        result.append(getattr(fn, '_unboundwrapper', fn))
        fn = getattr(fn, '_origfunc', None)
    return result

def _disabledpaths(strip_init=False):
    '''find paths of disabled extensions. returns a dict of {name: path}
    removes /__init__.py from packages if strip_init is True'''
    import hgext
    extpath = os.path.dirname(os.path.abspath(hgext.__file__))
    try: # might not be a filesystem path
        files = os.listdir(extpath)
    except OSError:
        return {}

    exts = {}
    for e in files:
        if e.endswith('.py'):
            name = e.rsplit('.', 1)[0]
            path = os.path.join(extpath, e)
        else:
            name = e
            path = os.path.join(extpath, e, '__init__.py')
            if not os.path.exists(path):
                continue
            if strip_init:
                path = os.path.dirname(path)
        if name in exts or name in _order or name == '__init__':
            continue
        exts[name] = path
    exts.update(_disabledextensions)
    return exts

def _moduledoc(file):
    '''return the top-level python documentation for the given file

    Loosely inspired by pydoc.source_synopsis(), but rewritten to
    handle triple quotes and to return the whole text instead of just
    the synopsis'''
    result = []

    line = file.readline()
    while line[:1] == '#' or not line.strip():
        line = file.readline()
        if not line:
            break

    start = line[:3]
    if start == '"""' or start == "'''":
        line = line[3:]
        while line:
            if line.rstrip().endswith(start):
                line = line.split(start)[0]
                if line:
                    result.append(line)
                break
            elif not line:
                return None # unmatched delimiter
            result.append(line)
            line = file.readline()
    else:
        return None

    return ''.join(result)

def _disabledhelp(path):
    '''retrieve help synopsis of a disabled extension (without importing)'''
    try:
        file = open(path)
    except IOError:
        return
    else:
        doc = _moduledoc(file)
        file.close()

    if doc: # extracting localized synopsis
        return gettext(doc)
    else:
        return _('(no help text available)')

def disabled():
    '''find disabled extensions from hgext. returns a dict of {name: desc}'''
    try:
        from hgext import __index__
        return dict((name, gettext(desc))
                    for name, desc in __index__.docs.iteritems()
                    if name not in _order)
    except (ImportError, AttributeError):
        pass

    paths = _disabledpaths()
    if not paths:
        return {}

    exts = {}
    for name, path in paths.iteritems():
        doc = _disabledhelp(path)
        if doc:
            exts[name] = doc.splitlines()[0]

    return exts

def disabledext(name):
    '''find a specific disabled extension from hgext. returns desc'''
    try:
        from hgext import __index__
        if name in _order:  # enabled
            return
        else:
            return gettext(__index__.docs.get(name))
    except (ImportError, AttributeError):
        pass

    paths = _disabledpaths()
    if name in paths:
        return _disabledhelp(paths[name])

def disabledcmd(ui, cmd, strict=False):
    '''import disabled extensions until cmd is found.
    returns (cmdname, extname, module)'''

    paths = _disabledpaths(strip_init=True)
    if not paths:
        raise error.UnknownCommand(cmd)

    def findcmd(cmd, name, path):
        try:
            mod = loadpath(path, 'hgext.%s' % name)
        except Exception:
            return
        try:
            aliases, entry = cmdutil.findcmd(cmd,
                getattr(mod, 'cmdtable', {}), strict)
        except (error.AmbiguousCommand, error.UnknownCommand):
            return
        except Exception:
            ui.warn(_('warning: error finding commands in %s\n') % path)
            ui.traceback()
            return
        for c in aliases:
            if c.startswith(cmd):
                cmd = c
                break
        else:
            cmd = aliases[0]
        return (cmd, name, mod)

    ext = None
    # first, search for an extension with the same name as the command
    path = paths.pop(cmd, None)
    if path:
        ext = findcmd(cmd, cmd, path)
    if not ext:
        # otherwise, interrogate each extension until there's a match
        for name, path in paths.iteritems():
            ext = findcmd(cmd, name, path)
            if ext:
                break
    if ext and 'DEPRECATED' not in ext.__doc__:
        return ext

    raise error.UnknownCommand(cmd)

def enabled(shortname=True):
    '''return a dict of {name: desc} of extensions'''
    exts = {}
    for ename, ext in extensions():
        doc = (gettext(ext.__doc__) or _('(no help text available)'))
        if shortname:
            ename = ename.split('.')[-1]
        exts[ename] = doc.splitlines()[0].strip()

    return exts

def notloaded():
    '''return short names of extensions that failed to load'''
    return [name for name, mod in _extensions.iteritems() if mod is None]

def moduleversion(module):
    '''return version information from given module as a string'''
    if (util.safehasattr(module, 'getversion')
          and callable(module.getversion)):
        version = module.getversion()
    elif util.safehasattr(module, '__version__'):
        version = module.__version__
    else:
        version = ''
    if isinstance(version, (list, tuple)):
        version = '.'.join(str(o) for o in version)
    return version

def ismoduleinternal(module):
    exttestedwith = getattr(module, 'testedwith', None)
    return exttestedwith == "ships-with-hg-core"