comparison hgext/purge.py @ 5517:98d5f9b95699

purge: simplify safety net for case mangling filesystems

Relying on the exact return of statwalk would cause us to abort
when there was at least one tracked file inside an ignored directory.

This patch forces an extra walk of the whole working directory even
on sane filesystems, where it wouldn't be needed.

Fixes issue621.

5516:f252ba975925

            except OSError, e:
                error(_('%s cannot be removed') % name)
        else:
            ui.write('%s%s' % (name, eol))

    directories = []
    files = []
    missing = []
    roots, match, anypats = util.cmdmatcher(repo.root, repo.getcwd(), dirs,
                                            include, exclude)

        elif src == 'm':
            missing.append(f)
        elif src == 'f' and f not in repo.dirstate:
            files.append(f)

    _check_missing(ui, repo, missing, force)

    directories.sort()

    for f in files:
        if f not in repo.dirstate:
            ui.note(_('Removing file %s\n') % f)

    for f in directories[::-1]:
        if match(f) and not os.listdir(repo.wjoin(f)):
            ui.note(_('Removing directory %s\n') % f)
            remove(os.rmdir, f)

def _check_missing(ui, repo, missing, force=False):
    """Abort if there is the chance of having problems with name-mangling fs

    In a name mangling filesystem (e.g. a case insensitive one)
    dirstate.walk() can yield filenames different from the ones
    stored in the dirstate. This already confuses the status and
    add commands, but with purge this may cause data loss.

    To prevent this, _check_missing will abort if there are missing
    files. The force option will let the user skip the check if he
    knows it is safe.

    Even with the force option this function will check if any of the
    missing files is still available in the working dir: if so there
    may be some problem with the underlying filesystem, so it
    aborts unconditionally."""

    found = [f for f in missing if util.lexists(repo.wjoin(f))]

    if found:
        if not ui.quiet:
            ui.warn(_("The following tracked files weren't listed by the "
                      "filesystem, but could still be found:\n"))
            for f in found:
                ui.warn("%s\n" % f)
            if util.checkfolding(repo.path):
                ui.warn(_("This is probably due to a case-insensitive "
                          "filesystem\n"))
        raise util.Abort(_("purging on name mangling filesystems is not "
                           "yet fully supported"))

    if missing and not force:
        raise util.Abort(_("there are missing files in the working dir and "
                           "purge still has problems with them due to name "
                           "mangling filesystems. "
                           "Use --force if you know what you are doing"))


def purge(ui, repo, *dirs, **opts):
    '''removes files not tracked by mercurial

cmdtable = {
    'purge|clean':
        (purge,
         [('a', 'abort-on-err', None, _('abort if an error occurs')),
          ('',  'all', None, _('purge ignored files too')),
          ('f', 'force', None, _('purge even when missing files are detected')),
          ('p', 'print', None, _('print the file names instead of deleting them')),
          ('0', 'print0', None, _('end filenames with NUL, for use with xargs'
                                  ' (implies -p)')),
         ] + commands.walkopts,
         _('hg purge [OPTION]... [DIR]...'))

5517:98d5f9b95699

            except OSError, e:
                error(_('%s cannot be removed') % name)
        else:
            ui.write('%s%s' % (name, eol))

    if not force:
        _check_fs(ui, repo)

    directories = []
    files = []
    missing = []
    roots, match, anypats = util.cmdmatcher(repo.root, repo.getcwd(), dirs,
                                            include, exclude)

        elif src == 'm':
            missing.append(f)
        elif src == 'f' and f not in repo.dirstate:
            files.append(f)

    directories.sort()

    for f in files:
        if f not in repo.dirstate:
            ui.note(_('Removing file %s\n') % f)

    for f in directories[::-1]:
        if match(f) and not os.listdir(repo.wjoin(f)):
            ui.note(_('Removing directory %s\n') % f)
            remove(os.rmdir, f)

def _check_fs(ui, repo):
    """Abort if there is the chance of having problems with name-mangling fs

    In a name mangling filesystem (e.g. a case insensitive one)
    dirstate.walk() can yield filenames different from the ones
    stored in the dirstate. This already confuses the status and
    add commands, but with purge this may cause data loss.

    To prevent this, this function will abort if there are uncommitted
    changes.
    """

    # We can't use (files, match) to do a partial walk here - we wouldn't
    # notice a modified README file if the user ran "hg purge readme"
    modified, added, removed, deleted = repo.status()[:4]
    if modified or added or removed or deleted:
        if not util.checkfolding(repo.path) and not ui.quiet:
            ui.warn(_("Purging on name mangling filesystems is not "
                      "fully supported.\n"))
        raise util.Abort(_("outstanding uncommitted changes"))


def purge(ui, repo, *dirs, **opts):
    '''removes files not tracked by mercurial

cmdtable = {
    'purge|clean':
        (purge,
         [('a', 'abort-on-err', None, _('abort if an error occurs')),
          ('',  'all', None, _('purge ignored files too')),
          ('f', 'force', None, _('purge even when there are uncommitted changes')),
          ('p', 'print', None, _('print the file names instead of deleting them')),
          ('0', 'print0', None, _('end filenames with NUL, for use with xargs'
                                  ' (implies -p)')),
         ] + commands.walkopts,
         _('hg purge [OPTION]... [DIR]...'))