hgext/convert/gnuarch.py

convert: introduce --full for converting all files

Convert will normally only process files that were changed in a source
revision, apply the filemap, and record it has a change in the target
repository. (If it ends up not really changing anything, nothing changes.)

That means that _if_ the filemap is changed before continuing an incremental
convert, the change will only kick in when the files it affects are modified in
a source revision and thus processed.

With --full, convert will make a full conversion every time and process
all files in the source repo and remove target repo files that shouldn't be
there. Filemap changes will thus kick in on the first converted revision, no
matter what is changed.

This flag should in most cases not make any difference but will make convert
significantly slower.

Other names has been considered for this feature, such as "resync", "sync",
"checkunmodified", "all" or "allfiles", but I found that they were less obvious
and required more explanation than "full" and were harder to describe
consistently.

# gnuarch.py - GNU Arch support for the convert extension
#
#  Copyright 2008, 2009 Aleix Conchillo Flaque <[e-mail]>
#  and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from common import NoRepo, commandline, commit, converter_source
from mercurial.i18n import _
from mercurial import encoding, util
import os, shutil, tempfile, stat
from email.Parser import Parser

class gnuarch_source(converter_source, commandline):

    class gnuarch_rev(object):
        def __init__(self, rev):
            self.rev = rev
            self.summary = ''
            self.date = None
            self.author = ''
            self.continuationof = None
            self.add_files = []
            self.mod_files = []
            self.del_files = []
            self.ren_files = {}
            self.ren_dirs = {}

    def __init__(self, ui, path, rev=None):
        super(gnuarch_source, self).__init__(ui, path, rev=rev)

        if not os.path.exists(os.path.join(path, '{arch}')):
            raise NoRepo(_("%s does not look like a GNU Arch repository")
                         % path)

        # Could use checktool, but we want to check for baz or tla.
        self.execmd = None
        if util.findexe('baz'):
            self.execmd = 'baz'
        else:
            if util.findexe('tla'):
                self.execmd = 'tla'
            else:
                raise util.Abort(_('cannot find a GNU Arch tool'))

        commandline.__init__(self, ui, self.execmd)

        self.path = os.path.realpath(path)
        self.tmppath = None

        self.treeversion = None
        self.lastrev = None
        self.changes = {}
        self.parents = {}
        self.tags = {}
        self.catlogparser = Parser()
        self.encoding = encoding.encoding
        self.archives = []

    def before(self):
        # Get registered archives
        self.archives = [i.rstrip('\n')
                         for i in self.runlines0('archives', '-n')]

        if self.execmd == 'tla':
            output = self.run0('tree-version', self.path)
        else:
            output = self.run0('tree-version', '-d', self.path)
        self.treeversion = output.strip()

        # Get name of temporary directory
        version = self.treeversion.split('/')
        self.tmppath = os.path.join(tempfile.gettempdir(),
                                    'hg-%s' % version[1])

        # Generate parents dictionary
        self.parents[None] = []
        treeversion = self.treeversion
        child = None
        while treeversion:
            self.ui.status(_('analyzing tree version %s...\n') % treeversion)

            archive = treeversion.split('/')[0]
            if archive not in self.archives:
                self.ui.status(_('tree analysis stopped because it points to '
                                 'an unregistered archive %s...\n') % archive)
                break

            # Get the complete list of revisions for that tree version
            output, status = self.runlines('revisions', '-r', '-f', treeversion)
            self.checkexit(status, 'failed retrieving revisions for %s'
                           % treeversion)

            # No new iteration unless a revision has a continuation-of header
            treeversion = None

            for l in output:
                rev = l.strip()
                self.changes[rev] = self.gnuarch_rev(rev)
                self.parents[rev] = []

                # Read author, date and summary
                catlog, status = self.run('cat-log', '-d', self.path, rev)
                if status:
                    catlog  = self.run0('cat-archive-log', rev)
                self._parsecatlog(catlog, rev)

                # Populate the parents map
                self.parents[child].append(rev)

                # Keep track of the current revision as the child of the next
                # revision scanned
                child = rev

                # Check if we have to follow the usual incremental history
                # or if we have to 'jump' to a different treeversion given
                # by the continuation-of header.
                if self.changes[rev].continuationof:
                    treeversion = '--'.join(
                        self.changes[rev].continuationof.split('--')[:-1])
                    break

                # If we reached a base-0 revision w/o any continuation-of
                # header, it means the tree history ends here.
                if rev[-6:] == 'base-0':
                    break

    def after(self):
        self.ui.debug('cleaning up %s\n' % self.tmppath)
        shutil.rmtree(self.tmppath, ignore_errors=True)

    def getheads(self):
        return self.parents[None]

    def getfile(self, name, rev):
        if rev != self.lastrev:
            raise util.Abort(_('internal calling inconsistency'))

        if not os.path.lexists(os.path.join(self.tmppath, name)):
            return None, None

        return self._getfile(name, rev)

    def getchanges(self, rev, full):
        if full:
            raise util.Abort(_("convert from arch do not support --full"))
        self._update(rev)
        changes = []
        copies = {}

        for f in self.changes[rev].add_files:
            changes.append((f, rev))

        for f in self.changes[rev].mod_files:
            changes.append((f, rev))

        for f in self.changes[rev].del_files:
            changes.append((f, rev))

        for src in self.changes[rev].ren_files:
            to = self.changes[rev].ren_files[src]
            changes.append((src, rev))
            changes.append((to, rev))
            copies[to] = src

        for src in self.changes[rev].ren_dirs:
            to = self.changes[rev].ren_dirs[src]
            chgs, cps = self._rendirchanges(src, to)
            changes += [(f, rev) for f in chgs]
            copies.update(cps)

        self.lastrev = rev
        return sorted(set(changes)), copies

    def getcommit(self, rev):
        changes = self.changes[rev]
        return commit(author=changes.author, date=changes.date,
                      desc=changes.summary, parents=self.parents[rev], rev=rev)

    def gettags(self):
        return self.tags

    def _execute(self, cmd, *args, **kwargs):
        cmdline = [self.execmd, cmd]
        cmdline += args
        cmdline = [util.shellquote(arg) for arg in cmdline]
        cmdline += ['>', os.devnull, '2>', os.devnull]
        cmdline = util.quotecommand(' '.join(cmdline))
        self.ui.debug(cmdline, '\n')
        return os.system(cmdline)

    def _update(self, rev):
        self.ui.debug('applying revision %s...\n' % rev)
        changeset, status = self.runlines('replay', '-d', self.tmppath,
                                              rev)
        if status:
            # Something went wrong while merging (baz or tla
            # issue?), get latest revision and try from there
            shutil.rmtree(self.tmppath, ignore_errors=True)
            self._obtainrevision(rev)
        else:
            old_rev = self.parents[rev][0]
            self.ui.debug('computing changeset between %s and %s...\n'
                          % (old_rev, rev))
            self._parsechangeset(changeset, rev)

    def _getfile(self, name, rev):
        mode = os.lstat(os.path.join(self.tmppath, name)).st_mode
        if stat.S_ISLNK(mode):
            data = os.readlink(os.path.join(self.tmppath, name))
            mode = mode and 'l' or ''
        else:
            data = open(os.path.join(self.tmppath, name), 'rb').read()
            mode = (mode & 0111) and 'x' or ''
        return data, mode

    def _exclude(self, name):
        exclude = ['{arch}', '.arch-ids', '.arch-inventory']
        for exc in exclude:
            if name.find(exc) != -1:
                return True
        return False

    def _readcontents(self, path):
        files = []
        contents = os.listdir(path)
        while len(contents) > 0:
            c = contents.pop()
            p = os.path.join(path, c)
            # os.walk could be used, but here we avoid internal GNU
            # Arch files and directories, thus saving a lot time.
            if not self._exclude(p):
                if os.path.isdir(p):
                    contents += [os.path.join(c, f) for f in os.listdir(p)]
                else:
                    files.append(c)
        return files

    def _rendirchanges(self, src, dest):
        changes = []
        copies = {}
        files = self._readcontents(os.path.join(self.tmppath, dest))
        for f in files:
            s = os.path.join(src, f)
            d = os.path.join(dest, f)
            changes.append(s)
            changes.append(d)
            copies[d] = s
        return changes, copies

    def _obtainrevision(self, rev):
        self.ui.debug('obtaining revision %s...\n' % rev)
        output = self._execute('get', rev, self.tmppath)
        self.checkexit(output)
        self.ui.debug('analyzing revision %s...\n' % rev)
        files = self._readcontents(self.tmppath)
        self.changes[rev].add_files += files

    def _stripbasepath(self, path):
        if path.startswith('./'):
            return path[2:]
        return path

    def _parsecatlog(self, data, rev):
        try:
            catlog = self.catlogparser.parsestr(data)

            # Commit date
            self.changes[rev].date = util.datestr(
                util.strdate(catlog['Standard-date'],
                             '%Y-%m-%d %H:%M:%S'))

            # Commit author
            self.changes[rev].author = self.recode(catlog['Creator'])

            # Commit description
            self.changes[rev].summary = '\n\n'.join((catlog['Summary'],
                                                    catlog.get_payload()))
            self.changes[rev].summary = self.recode(self.changes[rev].summary)

            # Commit revision origin when dealing with a branch or tag
            if 'Continuation-of' in catlog:
                self.changes[rev].continuationof = self.recode(
                    catlog['Continuation-of'])
        except Exception:
            raise util.Abort(_('could not parse cat-log of %s') % rev)

    def _parsechangeset(self, data, rev):
        for l in data:
            l = l.strip()
            # Added file (ignore added directory)
            if l.startswith('A') and not l.startswith('A/'):
                file = self._stripbasepath(l[1:].strip())
                if not self._exclude(file):
                    self.changes[rev].add_files.append(file)
            # Deleted file (ignore deleted directory)
            elif l.startswith('D') and not l.startswith('D/'):
                file = self._stripbasepath(l[1:].strip())
                if not self._exclude(file):
                    self.changes[rev].del_files.append(file)
            # Modified binary file
            elif l.startswith('Mb'):
                file = self._stripbasepath(l[2:].strip())
                if not self._exclude(file):
                    self.changes[rev].mod_files.append(file)
            # Modified link
            elif l.startswith('M->'):
                file = self._stripbasepath(l[3:].strip())
                if not self._exclude(file):
                    self.changes[rev].mod_files.append(file)
            # Modified file
            elif l.startswith('M'):
                file = self._stripbasepath(l[1:].strip())
                if not self._exclude(file):
                    self.changes[rev].mod_files.append(file)
            # Renamed file (or link)
            elif l.startswith('=>'):
                files = l[2:].strip().split(' ')
                if len(files) == 1:
                    files = l[2:].strip().split('\t')
                src = self._stripbasepath(files[0])
                dst = self._stripbasepath(files[1])
                if not self._exclude(src) and not self._exclude(dst):
                    self.changes[rev].ren_files[src] = dst
            # Conversion from file to link or from link to file (modified)
            elif l.startswith('ch'):
                file = self._stripbasepath(l[2:].strip())
                if not self._exclude(file):
                    self.changes[rev].mod_files.append(file)
            # Renamed directory
            elif l.startswith('/>'):
                dirs = l[2:].strip().split(' ')
                if len(dirs) == 1:
                    dirs = l[2:].strip().split('\t')
                src = self._stripbasepath(dirs[0])
                dst = self._stripbasepath(dirs[1])
                if not self._exclude(src) and not self._exclude(dst):
                    self.changes[rev].ren_dirs[src] = dst