toolsutils.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Fri, 24 Jul 2009 14:33:37 +0200
changeset 2476 1294a6bdf3bf
parent 2397 cdedc2a32b06
child 2615 1ea41b7c0836
permissions -rw-r--r--
application -> instance where it makes sense
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"""some utilities for cubicweb tools
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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# XXX move most of this in logilab.common (shellutils ?)
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import os, sys
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from os import listdir, makedirs, symlink, environ, chmod, walk, remove
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from os.path import exists, join, abspath, normpath
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from logilab.common.clcommands import Command as BaseCommand, \
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     main_run as base_main_run
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from logilab.common.compat import any
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from logilab.common.shellutils import confirm
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from cubicweb import warning
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from cubicweb import ConfigurationError, ExecutionError
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def iter_dir(directory, condition_file=None, ignore=()):
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    """iterate on a directory"""
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    for sub in listdir(directory):
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        if sub in ('CVS', '.svn', '.hg'):
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            continue
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        if condition_file is not None and \
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               not exists(join(directory, sub, condition_file)):
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            continue
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        if sub in ignore:
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            continue
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        yield sub
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def create_dir(directory):
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    """create a directory if it doesn't exist yet"""
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    try:
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        makedirs(directory)
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        print '-> created directory %s.' % directory
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    except OSError, ex:
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        import errno
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        if ex.errno != errno.EEXIST:
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            raise
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        print '-> directory %s already exists, no need to create it.' % directory
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def create_symlink(source, target):
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    """create a symbolic link"""
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    if exists(target):
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        remove(target)
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    symlink(source, target)
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    print '[symlink] %s <-- %s' % (target, source)
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def create_copy(source, target):
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    import shutil
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    print '[copy] %s <-- %s' % (target, source)
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    shutil.copy2(source, target)
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def rm(whatever):
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    import shutil
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    shutil.rmtree(whatever)
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    print '-> removed %s' % whatever
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def show_diffs(appl_file, ref_file, askconfirm=True):
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    """interactivly replace the old file with the new file according to
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    user decision
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    """
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    import shutil
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    p_output = os.popen('diff -u %s %s' % (appl_file, ref_file), 'r')
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    diffs = p_output.read()
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    if diffs:
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        if askconfirm:
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            print
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            print diffs
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            action = raw_input('replace (N/y/q) ? ').lower()
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        else:
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            action = 'y'
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        if action == 'y':
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            try:
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                shutil.copyfile(ref_file, appl_file)
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            except IOError:
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                os.system('chmod a+w %s' % appl_file)
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                shutil.copyfile(ref_file, appl_file)
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            print 'replaced'
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        elif action == 'q':
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            sys.exit(0)
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        else:
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            copy_file = appl_file + '.default'
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            copy = file(copy_file, 'w')
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            copy.write(open(ref_file).read())
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            copy.close()
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            print 'keep current version, the new file has been written to', copy_file
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    else:
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        print 'no diff between %s and %s' % (appl_file, ref_file)
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def copy_skeleton(skeldir, targetdir, context,
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                  exclude=('*.py[co]', '*.orig', '*~', '*_flymake.py'),
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                  askconfirm=False):
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    import shutil
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    from fnmatch import fnmatch
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    skeldir = normpath(skeldir)
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    targetdir = normpath(targetdir)
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    for dirpath, dirnames, filenames in walk(skeldir):
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        tdirpath = dirpath.replace(skeldir, targetdir)
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        create_dir(tdirpath)
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        for fname in filenames:
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            if any(fnmatch(fname, pat) for pat in exclude):
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                continue
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            fpath = join(dirpath, fname)
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            if 'CUBENAME' in fname:
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                tfpath = join(tdirpath, fname.replace('CUBENAME', context['cubename']))
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            elif 'DISTNAME' in fname:
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                tfpath = join(tdirpath, fname.replace('DISTNAME', context['distname']))
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            else:
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                tfpath = join(tdirpath, fname)
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            if fname.endswith('.tmpl'):
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                tfpath = tfpath[:-5]
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                if not askconfirm or not exists(tfpath) or \
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                       confirm('%s exists, overwrite?' % tfpath):
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                    fill_templated_file(fpath, tfpath, context)
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                    print '[generate] %s <-- %s' % (tfpath, fpath)
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            elif exists(tfpath):
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                show_diffs(tfpath, fpath, askconfirm)
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            else:
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                shutil.copyfile(fpath, tfpath)
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def fill_templated_file(fpath, tfpath, context):
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    fobj = file(tfpath, 'w')
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    templated = file(fpath).read()
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    fobj.write(templated % context)
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    fobj.close()
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def restrict_perms_to_user(filepath, log=None):
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    """set -rw------- permission on the given file"""
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    if log:
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        log('set %s permissions to 0600', filepath)
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    else:
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        print '-> set %s permissions to 0600' % filepath
0
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    chmod(filepath, 0600)
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def read_config(config_file):
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    """read the instance configuration from a file and return it as a
0
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    dictionnary
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    :type config_file: str
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    :param config_file: path to the configuration file
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    :rtype: dict
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    :return: a dictionary with specified values associated to option names
0
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    """
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    from logilab.common.fileutils import lines
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    config = current = {}
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    try:
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        for line in lines(config_file, comments='#'):
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            try:
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                option, value = line.split('=', 1)
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   158
            except ValueError:
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                option = line.strip().lower()
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                if option[0] == '[':
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                    # start a section
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                    section = option[1:-1]
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                    assert not config.has_key(section), \
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                           'Section %s is defined more than once' % section
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                    config[section] = current = {}
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                    continue
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                print >> sys.stderr, 'ignoring malformed line\n%r' % line
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                continue
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            option = option.strip().replace(' ', '_')
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            value = value.strip()
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            current[option] = value or None
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    except IOError, ex:
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        warning('missing or non readable configuration file %s (%s)',
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                config_file, ex)
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    return config
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   176
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def env_path(env_var, default, name):
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    """get a path specified in a variable or using the default value and return
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    it.
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    :type env_var: str
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    :param env_var: name of an environment variable
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   183
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   184
    :type default: str
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    :param default: default value if the environment variable is not defined
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diff changeset
   186
0
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    :type name: str
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    :param name: the informal name of the path, used for error message
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0
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    :rtype: str
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    :return: the value of the environment variable or the default value
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   192
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    :raise `ConfigurationError`: if the returned path does not exist
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   194
    """
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   195
    path = environ.get(env_var, default)
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   196
    if not exists(path):
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   197
        raise ConfigurationError('%s path %s doesn\'t exist' % (name, path))
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   198
    return abspath(path)
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   199
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   200
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   201
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_HDLRS = {}
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   203
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class metacmdhandler(type):
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    def __new__(mcs, name, bases, classdict):
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        cls = super(metacmdhandler, mcs).__new__(mcs, name, bases, classdict)
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        if getattr(cls, 'cfgname', None) and getattr(cls, 'cmdname', None):
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   208
            _HDLRS.setdefault(cls.cmdname, []).append(cls)
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   209
        return cls
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diff changeset
   210
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diff changeset
   211
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   212
class CommandHandler(object):
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    """configuration specific helper for cubicweb-ctl commands"""
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    __metaclass__ = metacmdhandler
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   215
    def __init__(self, config):
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   216
        self.config = config
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class Command(BaseCommand):
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    """base class for cubicweb-ctl commands"""
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   220
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    def config_helper(self, config, required=True, cmdname=None):
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   222
        if cmdname is None:
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            cmdname = self.name
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   224
        for helpercls in _HDLRS.get(cmdname, ()):
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   225
            if helpercls.cfgname == config.name:
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                return helpercls(config)
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        if config.name == 'all-in-one':
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   228
            for helpercls in _HDLRS.get(cmdname, ()):
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   229
                if helpercls.cfgname == 'repository':
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   230
                    return helpercls(config)
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   231
        if required:
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   232
            msg = 'No helper for command %s using %s configuration' % (
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   233
                cmdname, config.name)
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   234
            raise ConfigurationError(msg)
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diff changeset
   235
0
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   236
    def fail(self, reason):
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   237
        print "command failed:", reason
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   238
        sys.exit(1)
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diff changeset
   239
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   240
0
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   241
def main_run(args, doc):
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   242
    """command line tool"""
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diff changeset
   243
    try:
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   244
        base_main_run(args, doc)
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   245
    except ConfigurationError, err:
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diff changeset
   246
        print 'ERROR: ', err
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diff changeset
   247
        sys.exit(1)
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diff changeset
   248
    except ExecutionError, err:
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diff changeset
   249
        print err
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   250
        sys.exit(2)
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diff changeset
   251
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   252
CONNECT_OPTIONS = (
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   253
    ("user",
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diff changeset
   254
     {'short': 'u', 'type' : 'string', 'metavar': '<user>',
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parents:
diff changeset
   255
      'help': 'connect as <user> instead of being prompted to give it.',
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parents:
diff changeset
   256
      }
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   257
     ),
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   258
    ("password",
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   259
     {'short': 'p', 'type' : 'password', 'metavar': '<password>',
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diff changeset
   260
      'help': 'automatically give <password> for authentication instead of \
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parents:
diff changeset
   261
being prompted to give it.',
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parents:
diff changeset
   262
      }),
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parents:
diff changeset
   263
    ("host",
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parents:
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     {'short': 'H', 'type' : 'string', 'metavar': '<hostname>',
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      'default': None,
0
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      'help': 'specify the name server\'s host name. Will be detected by \
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broadcast if not provided.',
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      }),
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    )
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def config_connect(appid, optconfig):
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    from cubicweb.dbapi import connect
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    from getpass import getpass
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    user = optconfig.user
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    if not user:
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        user = raw_input('login: ')
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    password = optconfig.password
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    if not password:
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        password = getpass('password: ')
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    return connect(login=user, password=password, host=optconfig.host, database=appid)
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