"""Installation utilities for Python ISAPI filters and extensions."""
# this code adapted from "Tomcat JK2 ISAPI redirector", part of Apache
# Created July 2004, Mark Hammond.
import sys, os, imp, shutil, stat
import operator
from win32com.client import GetObject,Dispatch
from win32com.client.gencache import EnsureModule,EnsureDispatch
import win32api
import pythoncom
import winerror
import traceback
_APP_INPROC = 0
_APP_OUTPROC = 1
_APP_POOLED = 2
_IIS_OBJECT = "IIS://LocalHost/W3SVC"
_IIS_SERVER = "IIsWebServer"
_IIS_WEBDIR = "IIsWebDirectory"
_IIS_WEBVIRTUALDIR = "IIsWebVirtualDir"
_IIS_FILTERS = "IIsFilters"
_IIS_FILTER = "IIsFilter"
_DEFAULT_SERVER_NAME = "Default Web Site"
_DEFAULT_HEADERS = "X-Powered-By: Python"
_DEFAULT_PROTECTION = _APP_POOLED
# Default is for 'execute' only access - ie, only the extension
# can be used. This can be overridden via your install script.
_DEFAULT_ACCESS_EXECUTE = True
_DEFAULT_ACCESS_READ = False
_DEFAULT_ACCESS_WRITE = False
_DEFAULT_ACCESS_SCRIPT = False
_DEFAULT_CONTENT_INDEXED = False
_DEFAULT_ENABLE_DIR_BROWSING = False
_DEFAULT_ENABLE_DEFAULT_DOC = False
_extensions = [ext for ext, _, _ in imp.get_suffixes()]
is_debug_build = '_d.pyd' in _extensions
this_dir = os.path.abspath(os.path.dirname(__file__))
class FilterParameters:
Name = None
Description = None
Path = None
Server = None
# Params that control if/how AddExtensionFile is called.
AddExtensionFile = True
AddExtensionFile_Enabled = True
AddExtensionFile_GroupID = None # defaults to Name
AddExtensionFile_CanDelete = True
AddExtensionFile_Description = None # defaults to Description.
def __init__(self, **kw):
self.__dict__.update(kw)
class VirtualDirParameters:
Name = None # Must be provided.
Description = None # defaults to Name
AppProtection = _DEFAULT_PROTECTION
Headers = _DEFAULT_HEADERS
Path = None # defaults to WWW root.
Type = _IIS_WEBVIRTUALDIR
AccessExecute = _DEFAULT_ACCESS_EXECUTE
AccessRead = _DEFAULT_ACCESS_READ
AccessWrite = _DEFAULT_ACCESS_WRITE
AccessScript = _DEFAULT_ACCESS_SCRIPT
ContentIndexed = _DEFAULT_CONTENT_INDEXED
EnableDirBrowsing = _DEFAULT_ENABLE_DIR_BROWSING
EnableDefaultDoc = _DEFAULT_ENABLE_DEFAULT_DOC
DefaultDoc = None # Only set in IIS if not None
ScriptMaps = []
ScriptMapUpdate = "end" # can be 'start', 'end', 'replace'
Server = None
def __init__(self, **kw):
self.__dict__.update(kw)
def is_root(self):
"This virtual directory is a root directory if parent and name are blank"
parent, name = self.split_path()
return not parent and not name
def split_path(self):
return split_path(self.Name)
class ScriptMapParams:
Extension = None
Module = None
Flags = 5
Verbs = ""
# Params that control if/how AddExtensionFile is called.
AddExtensionFile = True
AddExtensionFile_Enabled = True
AddExtensionFile_GroupID = None # defaults to Name
AddExtensionFile_CanDelete = True
AddExtensionFile_Description = None # defaults to Description.
def __init__(self, **kw):
self.__dict__.update(kw)
def __str__(self):
"Format this parameter suitable for IIS"
items = [self.Extension, self.Module, self.Flags]
# IIS gets upset if there is a trailing verb comma, but no verbs
if self.Verbs:
items.append(self.Verbs)
items = [str(item) for item in items]
return ','.join(items)
class ISAPIParameters:
ServerName = _DEFAULT_SERVER_NAME
# Description = None
Filters = []
VirtualDirs = []
def __init__(self, **kw):
self.__dict__.update(kw)
verbose = 1 # The level - 0 is quiet.
def log(level, what):
if verbose >= level:
print what
# Convert an ADSI COM exception to the Win32 error code embedded in it.
def _GetWin32ErrorCode(com_exc):
hr = com_exc.hresult
# If we have more details in the 'excepinfo' struct, use it.
if com_exc.excepinfo:
hr = com_exc.excepinfo[-1]
if winerror.HRESULT_FACILITY(hr) != winerror.FACILITY_WIN32:
raise
return winerror.SCODE_CODE(hr)
class InstallationError(Exception): pass
class ItemNotFound(InstallationError): pass
class ConfigurationError(InstallationError): pass
def FindPath(options, server, name):
if name.lower().startswith("iis://"):
return name
else:
if name and name[0] != "/":
name = "/"+name
return FindWebServer(options, server)+"/ROOT"+name
def LocateWebServerPath(description):
"""
Find an IIS web server whose name or comment matches the provided
description (case-insensitive).
>>> LocateWebServerPath('Default Web Site') # doctest: +SKIP
or
>>> LocateWebServerPath('1') #doctest: +SKIP
"""
assert len(description) >= 1, "Server name or comment is required"
iis = GetObject(_IIS_OBJECT)
description = description.lower().strip()
for site in iis:
# Name is generally a number, but no need to assume that.
site_attributes = [getattr(site, attr, "").lower().strip()
for attr in ("Name", "ServerComment")]
if description in site_attributes:
return site.AdsPath
msg = "No web sites match the description '%s'" % description
raise ItemNotFound(msg)
def GetWebServer(description = None):
"""
Load the web server instance (COM object) for a given instance
or description.
If None is specified, the default website is retrieved (indicated
by the identifier 1.
"""
description = description or "1"
path = LocateWebServerPath(description)
server = LoadWebServer(path)
return server
def LoadWebServer(path):
try:
server = GetObject(path)
except pythoncom.com_error, details:
msg = details.strerror
if exc.excepinfo and exc.excepinfo[2]:
msg = exc.excepinfo[2]
msg = "WebServer %s: %s" % (path, msg)
raise ItemNotFound(msg)
return server
def FindWebServer(options, server_desc):
"""
Legacy function to allow options to define a .server property
to override the other parameter. Use GetWebServer instead.
"""
# options takes precedence
server_desc = options.server or server_desc
# make sure server_desc is unicode (could be mbcs if passed in
# sys.argv).
if server_desc and not isinstance(server_desc, unicode):
server_desc = server_desc.decode('mbcs')
# get the server (if server_desc is None, the default site is acquired)
server = GetWebServer(server_desc)
return server.adsPath
def split_path(path):
"""
Get the parent path and basename.
>>> split_path('/')
['', '']
>>> split_path('')
['', '']
>>> split_path('foo')
['', 'foo']
>>> split_path('/foo')
['', 'foo']
>>> split_path('/foo/bar')
['/foo', 'bar']
>>> split_path('foo/bar')
['/foo', 'bar']
"""
if not path.startswith('/'): path = '/' + path
return path.rsplit('/', 1)
def _CreateDirectory(iis_dir, name, params):
# We used to go to lengths to keep an existing virtual directory
# in place. However, in some cases the existing directories got
# into a bad state, and an update failed to get them working.
# So we nuke it first. If this is a problem, we could consider adding
# a --keep-existing option.
try:
# Also seen the Class change to a generic IISObject - so nuke
# *any* existing object, regardless of Class
assert name.strip("/"), "mustn't delete the root!"
iis_dir.Delete('', name)
log(2, "Deleted old directory '%s'" % (name,))
except pythoncom.com_error:
pass
newDir = iis_dir.Create(params.Type, name)
log(2, "Creating new directory '%s' in %s..." % (name,iis_dir.Name))
friendly = params.Description or params.Name
newDir.AppFriendlyName = friendly
# Note that the new directory won't be visible in the IIS UI
# unless the directory exists on the filesystem.
try:
path = params.Path or iis_dir.Path
newDir.Path = path
except AttributeError:
# If params.Type is IIS_WEBDIRECTORY, an exception is thrown
pass
newDir.AppCreate2(params.AppProtection)
# XXX - note that these Headers only work in IIS6 and earlier. IIS7
# only supports them on the w3svc node - not even on individial sites,
# let alone individual extensions in the site!
if params.Headers:
newDir.HttpCustomHeaders = params.Headers
log(2, "Setting directory options...")
newDir.AccessExecute = params.AccessExecute
newDir.AccessRead = params.AccessRead
newDir.AccessWrite = params.AccessWrite
newDir.AccessScript = params.AccessScript
newDir.ContentIndexed = params.ContentIndexed
newDir.EnableDirBrowsing = params.EnableDirBrowsing
newDir.EnableDefaultDoc = params.EnableDefaultDoc
if params.DefaultDoc is not None:
newDir.DefaultDoc = params.DefaultDoc
newDir.SetInfo()
return newDir
def CreateDirectory(params, options):
_CallHook(params, "PreInstall", options)
if not params.Name:
raise ConfigurationError("No Name param")
parent, name = params.split_path()
target_dir = GetObject(FindPath(options, params.Server, parent))
if not params.is_root():
target_dir = _CreateDirectory(target_dir, name, params)
AssignScriptMaps(params.ScriptMaps, target_dir, params.ScriptMapUpdate)
_CallHook(params, "PostInstall", options, target_dir)
log(1, "Configured Virtual Directory: %s" % (params.Name,))
return target_dir
def AssignScriptMaps(script_maps, target, update='replace'):
"""Updates IIS with the supplied script map information.
script_maps is a list of ScriptMapParameter objects
target is an IIS Virtual Directory to assign the script maps to
update is a string indicating how to update the maps, one of ('start',
'end', or 'replace')
"""
# determine which function to use to assign script maps
script_map_func = '_AssignScriptMaps' + update.capitalize()
try:
script_map_func = eval(script_map_func)
except NameError:
msg = "Unknown ScriptMapUpdate option '%s'" % update
raise ConfigurationError(msg)
# use the str method to format the script maps for IIS
script_maps = [str(s) for s in script_maps]
# call the correct function
script_map_func(target, script_maps)
target.SetInfo()
def get_unique_items(sequence, reference):
"Return items in sequence that can't be found in reference."
return tuple([item for item in sequence if item not in reference])
def _AssignScriptMapsReplace(target, script_maps):
target.ScriptMaps = script_maps
def _AssignScriptMapsEnd(target, script_maps):
unique_new_maps = get_unique_items(script_maps, target.ScriptMaps)
target.ScriptMaps = target.ScriptMaps + unique_new_maps
def _AssignScriptMapsStart(target, script_maps):
unique_new_maps = get_unique_items(script_maps, target.ScriptMaps)
target.ScriptMaps = unique_new_maps + target.ScriptMaps
def CreateISAPIFilter(filterParams, options):
server = FindWebServer(options, filterParams.Server)
_CallHook(filterParams, "PreInstall", options)
try:
filters = GetObject(server+"/Filters")
except pythoncom.com_error, exc:
# Brand new sites don't have the '/Filters' collection - create it.
# Any errors other than 'not found' we shouldn't ignore.
if winerror.HRESULT_FACILITY(exc.hresult) != winerror.FACILITY_WIN32 or \
winerror.HRESULT_CODE(exc.hresult) != winerror.ERROR_PATH_NOT_FOUND:
raise
server_ob = GetObject(server)
filters = server_ob.Create(_IIS_FILTERS, "Filters")
filters.FilterLoadOrder = ""
filters.SetInfo()
# As for VirtualDir, delete an existing one.
assert filterParams.Name.strip("/"), "mustn't delete the root!"
try:
filters.Delete(_IIS_FILTER, filterParams.Name)
log(2, "Deleted old filter '%s'" % (filterParams.Name,))
except pythoncom.com_error:
pass
newFilter = filters.Create(_IIS_FILTER, filterParams.Name)
log(2, "Created new ISAPI filter...")
assert os.path.isfile(filterParams.Path)
newFilter.FilterPath = filterParams.Path
newFilter.FilterDescription = filterParams.Description
newFilter.SetInfo()
load_order = [b.strip() for b in filters.FilterLoadOrder.split(",") if b]
if filterParams.Name not in load_order:
load_order.append(filterParams.Name)
filters.FilterLoadOrder = ",".join(load_order)
filters.SetInfo()
_CallHook(filterParams, "PostInstall", options, newFilter)
log (1, "Configured Filter: %s" % (filterParams.Name,))
return newFilter
def DeleteISAPIFilter(filterParams, options):
_CallHook(filterParams, "PreRemove", options)
server = FindWebServer(options, filterParams.Server)
ob_path = server+"/Filters"
try:
filters = GetObject(ob_path)
except pythoncom.com_error, details:
# failure to open the filters just means a totally clean IIS install
# (IIS5 at least has no 'Filters' key when freshly installed).
log(2, "ISAPI filter path '%s' did not exist." % (ob_path,))
return
try:
assert filterParams.Name.strip("/"), "mustn't delete the root!"
filters.Delete(_IIS_FILTER, filterParams.Name)
log(2, "Deleted ISAPI filter '%s'" % (filterParams.Name,))
except pythoncom.com_error, details:
rc = _GetWin32ErrorCode(details)
if rc != winerror.ERROR_PATH_NOT_FOUND:
raise
log(2, "ISAPI filter '%s' did not exist." % (filterParams.Name,))
# Remove from the load order
load_order = [b.strip() for b in filters.FilterLoadOrder.split(",") if b]
if filterParams.Name in load_order:
load_order.remove(filterParams.Name)
filters.FilterLoadOrder = ",".join(load_order)
filters.SetInfo()
_CallHook(filterParams, "PostRemove", options)
log (1, "Deleted Filter: %s" % (filterParams.Name,))
def _AddExtensionFile(module, def_groupid, def_desc, params, options):
group_id = params.AddExtensionFile_GroupID or def_groupid
desc = params.AddExtensionFile_Description or def_desc
try:
ob = GetObject(_IIS_OBJECT)
ob.AddExtensionFile(module,
params.AddExtensionFile_Enabled,
group_id,
params.AddExtensionFile_CanDelete,
desc)
log(2, "Added extension file '%s' (%s)" % (module, desc))
except (pythoncom.com_error, AttributeError), details:
# IIS5 always fails. Probably should upgrade this to
# complain more loudly if IIS6 fails.
log(2, "Failed to add extension file '%s': %s" % (module, details))
def AddExtensionFiles(params, options):
"""Register the modules used by the filters/extensions as a trusted
'extension module' - required by the default IIS6 security settings."""
# Add each module only once.
added = {}
for vd in params.VirtualDirs:
for smp in vd.ScriptMaps:
if smp.Module not in added and smp.AddExtensionFile:
_AddExtensionFile(smp.Module, vd.Name, vd.Description, smp,
options)
added[smp.Module] = True
for fd in params.Filters:
if fd.Path not in added and fd.AddExtensionFile:
_AddExtensionFile(fd.Path, fd.Name, fd.Description, fd, options)
added[fd.Path] = True
def _DeleteExtensionFileRecord(module, options):
try:
ob = GetObject(_IIS_OBJECT)
ob.DeleteExtensionFileRecord(module)
log(2, "Deleted extension file record for '%s'" % module)
except (pythoncom.com_error, AttributeError), details:
log(2, "Failed to remove extension file '%s': %s" % (module, details))
def DeleteExtensionFileRecords(params, options):
deleted = {} # only remove each .dll once.
for vd in params.VirtualDirs:
for smp in vd.ScriptMaps:
if smp.Module not in deleted and smp.AddExtensionFile:
_DeleteExtensionFileRecord(smp.Module, options)
deleted[smp.Module] = True
for filter_def in params.Filters:
if filter_def.Path not in deleted and filter_def.AddExtensionFile:
_DeleteExtensionFileRecord(filter_def.Path, options)
deleted[filter_def.Path] = True
def CheckLoaderModule(dll_name):
suffix = ""
if is_debug_build: suffix = "_d"
template = os.path.join(this_dir,
"PyISAPI_loader" + suffix + ".dll")
if not os.path.isfile(template):
raise ConfigurationError(
"Template loader '%s' does not exist" % (template,))
# We can't do a simple "is newer" check, as the DLL is specific to the
# Python version. So we check the date-time and size are identical,
# and skip the copy in that case.
src_stat = os.stat(template)
try:
dest_stat = os.stat(dll_name)
except os.error:
same = 0
else:
same = src_stat[stat.ST_SIZE]==dest_stat[stat.ST_SIZE] and \
src_stat[stat.ST_MTIME]==dest_stat[stat.ST_MTIME]
if not same:
log(2, "Updating %s->%s" % (template, dll_name))
shutil.copyfile(template, dll_name)
shutil.copystat(template, dll_name)
else:
log(2, "%s is up to date." % (dll_name,))
def _CallHook(ob, hook_name, options, *extra_args):
func = getattr(ob, hook_name, None)
if func is not None:
args = (ob,options) + extra_args
func(*args)
def Install(params, options):
_CallHook(params, "PreInstall", options)
for vd in params.VirtualDirs:
CreateDirectory(vd, options)
for filter_def in params.Filters:
CreateISAPIFilter(filter_def, options)
AddExtensionFiles(params, options)
_CallHook(params, "PostInstall", options)
def RemoveDirectory(params, options):
if params.is_root():
return
try:
directory = GetObject(FindPath(options, params.Server, params.Name))
except pythoncom.com_error, details:
rc = _GetWin32ErrorCode(details)
if rc != winerror.ERROR_PATH_NOT_FOUND:
raise
log(2, "VirtualDirectory '%s' did not exist" % params.Name)
directory = None
if directory is not None:
# Be robust should IIS get upset about unloading.
try:
directory.AppUnLoad()
except:
exc_val = sys.exc_info()[1]
log(2, "AppUnLoad() for %s failed: %s" % (params.Name, exc_val))
# Continue trying to delete it.
try:
parent = GetObject(directory.Parent)
parent.Delete(directory.Class, directory.Name)
log (1, "Deleted Virtual Directory: %s" % (params.Name,))
except:
exc_val = sys.exc_info()[1]
log(1, "Failed to remove directory %s: %s" % (params.Name, exc_val))
def RemoveScriptMaps(vd_params, options):
"Remove script maps from the already installed virtual directory"
parent, name = vd_params.split_path()
target_dir = GetObject(FindPath(options, vd_params.Server, parent))
installed_maps = list(target_dir.ScriptMaps)
for _map in map(str, vd_params.ScriptMaps):
if _map in installed_maps:
installed_maps.remove(_map)
target_dir.ScriptMaps = installed_maps
target_dir.SetInfo()
def Uninstall(params, options):
_CallHook(params, "PreRemove", options)
DeleteExtensionFileRecords(params, options)
for vd in params.VirtualDirs:
_CallHook(vd, "PreRemove", options)
RemoveDirectory(vd, options)
if vd.is_root():
# if this is installed to the root virtual directory, we can't delete it
# so remove the script maps.
RemoveScriptMaps(vd, options)
_CallHook(vd, "PostRemove", options)
for filter_def in params.Filters:
DeleteISAPIFilter(filter_def, options)
_CallHook(params, "PostRemove", options)
# Patch up any missing module names in the params, replacing them with
# the DLL name that hosts this extension/filter.
def _PatchParamsModule(params, dll_name, file_must_exist = True):
if file_must_exist:
if not os.path.isfile(dll_name):
raise ConfigurationError("%s does not exist" % (dll_name,))
# Patch up all references to the DLL.
for f in params.Filters:
if f.Path is None: f.Path = dll_name
for d in params.VirtualDirs:
for sm in d.ScriptMaps:
if sm.Module is None: sm.Module = dll_name
def GetLoaderModuleName(mod_name, check_module = None):
# find the name of the DLL hosting us.
# By default, this is "_{module_base_name}.dll"
if hasattr(sys, "frozen"):
# What to do? The .dll knows its name, but this is likely to be
# executed via a .exe, which does not know.
base, ext = os.path.splitext(mod_name)
path, base = os.path.split(base)
# handle the common case of 'foo.exe'/'foow.exe'
if base.endswith('w'):
base = base[:-1]
# For py2exe, we have '_foo.dll' as the standard pyisapi loader - but
# 'foo.dll' is what we use (it just delegates).
# So no leading '_' on the installed name.
dll_name = os.path.abspath(os.path.join(path, base + ".dll"))
else:
base, ext = os.path.splitext(mod_name)
path, base = os.path.split(base)
dll_name = os.path.abspath(os.path.join(path, "_" + base + ".dll"))
# Check we actually have it.
if check_module is None: check_module = not hasattr(sys, "frozen")
if check_module:
CheckLoaderModule(dll_name)
return dll_name
# Note the 'log' params to these 'builtin' args - old versions of pywin32
# didn't log at all in this function (by intent; anyone calling this was
# responsible). So existing code that calls this function with the old
# signature (ie, without a 'log' param) still gets the same behaviour as
# before...
def InstallModule(conf_module_name, params, options, log=lambda *args:None):
"Install the extension"
if not hasattr(sys, "frozen"):
conf_module_name = os.path.abspath(conf_module_name)
if not os.path.isfile(conf_module_name):
raise ConfigurationError("%s does not exist" % (conf_module_name,))
loader_dll = GetLoaderModuleName(conf_module_name)
_PatchParamsModule(params, loader_dll)
Install(params, options)
log(1, "Installation complete.")
def UninstallModule(conf_module_name, params, options, log=lambda *args:None):
"Remove the extension"
loader_dll = GetLoaderModuleName(conf_module_name, False)
_PatchParamsModule(params, loader_dll, False)
Uninstall(params, options)
log(1, "Uninstallation complete.")
standard_arguments = {
"install" : InstallModule,
"remove" : UninstallModule,
}
def build_usage(handler_map):
docstrings = [handler.__doc__ for handler in handler_map.itervalues()]
all_args = dict(zip(handler_map.iterkeys(), docstrings))
arg_names = "|".join(all_args.iterkeys())
usage_string = "%prog [options] [" + arg_names + "]\n"
usage_string += "commands:\n"
for arg, desc in all_args.iteritems():
usage_string += " %-10s: %s" % (arg, desc) + "\n"
return usage_string[:-1]
def MergeStandardOptions(options, params):
"""
Take an options object generated by the command line and merge
the values into the IISParameters object.
"""
pass
# We support 2 ways of extending our command-line/install support.
# * Many of the installation items allow you to specify "PreInstall",
# "PostInstall", "PreRemove" and "PostRemove" hooks
# All hooks are called with the 'params' object being operated on, and
# the 'optparser' options for this session (ie, the command-line options)
# PostInstall for VirtualDirectories and Filters both have an additional
# param - the ADSI object just created.
# * You can pass your own option parser for us to use, and/or define a map
# with your own custom arg handlers. It is a map of 'arg'->function.
# The function is called with (options, log_fn, arg). The function's
# docstring is used in the usage output.
def HandleCommandLine(params, argv=None, conf_module_name = None,
default_arg = "install",
opt_parser = None, custom_arg_handlers = {}):
"""Perform installation or removal of an ISAPI filter or extension.
This module handles standard command-line options and configuration
information, and installs, removes or updates the configuration of an
ISAPI filter or extension.
You must pass your configuration information in params - all other
arguments are optional, and allow you to configure the installation
process.
"""
global verbose
from optparse import OptionParser
argv = argv or sys.argv
if not conf_module_name:
conf_module_name = sys.argv[0]
# convert to a long name so that if we were somehow registered with
# the "short" version but unregistered with the "long" version we
# still work (that will depend on exactly how the installer was
# started)
try:
conf_module_name = win32api.GetLongPathName(conf_module_name)
except win32api.error, exc:
log(2, "Couldn't determine the long name for %r: %s" %
(conf_module_name, exc))
if opt_parser is None:
# Build our own parser.
parser = OptionParser(usage='')
else:
# The caller is providing their own filter, presumably with their
# own options all setup.
parser = opt_parser
# build a usage string if we don't have one.
if not parser.get_usage():
all_handlers = standard_arguments.copy()
all_handlers.update(custom_arg_handlers)
parser.set_usage(build_usage(all_handlers))
# allow the user to use uninstall as a synonym for remove if it wasn't
# defined by the custom arg handlers.
all_handlers.setdefault('uninstall', all_handlers['remove'])
parser.add_option("-q", "--quiet",
action="store_false", dest="verbose", default=True,
help="don't print status messages to stdout")
parser.add_option("-v", "--verbosity", action="count",
dest="verbose", default=1,
help="increase the verbosity of status messages")
parser.add_option("", "--server", action="store",
help="Specifies the IIS server to install/uninstall on." \
" Default is '%s/1'" % (_IIS_OBJECT,))
(options, args) = parser.parse_args(argv[1:])
MergeStandardOptions(options, params)
verbose = options.verbose
if not args:
args = [default_arg]
try:
for arg in args:
handler = all_handlers[arg]
handler(conf_module_name, params, options, log)
except (ItemNotFound, InstallationError), details:
if options.verbose > 1:
traceback.print_exc()
print "%s: %s" % (details.__class__.__name__, details)
except KeyError:
parser.error("Invalid arg '%s'" % arg)
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