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# R Overlay -- package info class
# Copyright 2006-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
import re
import os.path
import logging
import threading
from roverlay import config, util
LOGGER = logging.getLogger ( 'PackageInfo' )
VIRTUAL_KEYS = dict (
DISTDIR = frozenset ( ( 'distdir', 'pkg_distdir' ) ),
# removing this key
#EBUILD_FILE = frozenset ( ( 'ebuild_file', 'efile' ) ),
HAS_SUGGESTS = frozenset ( ( 'has_suggests', 'has_rsuggests' ) ),
SRC_URI = frozenset ( ( 'src_uri', 'package_url', 'url' ) ),
ALWAYS_FALLBACK = frozenset ( ( 'ebuild_filepath' ) ),
)
class PackageInfo ( object ):
"""PackageInfo offers easy, subscriptable (['sth']) access to package
information, whether stored or calculated.
"""
def __init__ ( self, **initial_info ):
"""Initializes a PackageInfo.
arguments:
* **initial_info -- passed to update ( **kw )
"""
self._info = dict()
self.readonly = False
self._update_lock = threading.RLock()
self.update ( **initial_info )
# --- end of __init__ (...) ---
def set_readonly ( self, immediate=False, final=False ):
"""Makes the package info readonly.
arguments:
* immediate -- do not acquire lock, set readonly directly,
defaults to False
* final -- if set and True: make this decision final
"""
self._set_mode ( True, immediate, final )
# --- end of set_readonly (...) ---
def set_writeable ( self, immediate=False ):
"""Makes the package info writeable.
arguments:
* immediate -- do not acquire lock, set writeable directly,
defaults to False
"""
self._set_mode ( False, immediate )
# --- end of set_writeable (...) ---
def _set_mode ( self, readonly_val, immediate=False, final=False ):
"""Sets readonly to True/False.
arguments:
* readonly_val -- new value for readonly
* immediate -- do not acquire lock
* final -- only if readonly_val is True: make this decision final,
raises: Exception if self.readonly is a constant (_readonly_final is set)
"""
if hasattr ( self, '_readonly_final' ):
raise Exception ( "cannot modify readonly - it's a constant." )
elif immediate:
self.readonly = readonly_val
if final and readonly_val:
self._readonly_final = True
elif not self.readonly is readonly_val:
self._update_lock.acquire()
self.readonly = readonly_val
if final and readonly_val:
self._readonly_final = True
self._update_lock.release()
# --- end of _set_mode (...) ---
def _writelock_acquire ( self ):
"""Acquires the lock required for adding new information.
raises: Exception if readonly (writing not allowed)
"""
if self.readonly or hasattr ( self, '_readonly_final' ):
raise Exception ( "package info is readonly!" )
self._update_lock.acquire()
if self.readonly or hasattr ( self, '_readonly_final' ):
self._update_lock.release()
raise Exception ( "package info is readonly!" )
return True
# --- end of _writelock_acquire (...) ---
def get ( self, key, fallback_value=None, do_fallback=False ):
"""Returns the value specified by key.
The value is either calculated or taken from dict self._info.
arguments:
* key --
* fallback_value -- fallback value if key not found / unknown
* do_fallback -- if True: return fallback_value, else raise KeyError
raises: KeyError
"""
key_low = key.lower()
# 'virtual' keys - calculate result
if key_low in VIRTUAL_KEYS ['DISTDIR']:
if 'package_dir' in self._info:
return self._info ['package_dir']
elif 'origin' in self._info:
return util.get_distdir ( self._info ['origin'] )
elif key_low in VIRTUAL_KEYS ['HAS_SUGGESTS']:
if 'has_suggests' in self._info:
return self._info ['has_suggests']
else:
return False
elif key_low in VIRTUAL_KEYS ['SRC_URI']:
# comment from ebuildjob:
## origin is todo (sync module knows the package origin)
## could calculate SRC_URI in the eclass depending on origin
# comment from ebuild:
## calculate SRC_URI using self._data ['origin'],
## either here or in eclass
return "**packageinfo needs information from sync module!"
# normal keys
if key in self._info:
return self._info [key]
elif key_low in self._info:
return self._info [key_low]
elif do_fallback or key_low in VIRTUAL_KEYS ['ALWAYS_FALLBACK']:
return fallback_value
else:
raise KeyError ( key )
# --- end of get (...) ---
def __getitem__ ( self, key ):
return self.get ( key, do_fallback=False )
# --- end of __getitem__ (...) ---
def __setitem__ ( self, key, value ):
"""Sets an item.
arguments:
* key --
* value --
raises: Exception when readonly
"""
self._writelock_acquire()
self._info [key] = value
self._update_lock.release()
# --- end of __setitem__ (...) ---
def update ( self, **info ):
"""Uses **info to update the package info data.
arguments:
* **info --
raises: Exception when readonly
"""
if len ( info ) == 0 :
# nothing to do
return
self._writelock_acquire()
if 'filepath' in info:
self._use_filepath ( info ['filepath'] )
if 'ebuild' in info:
self._use_ebuild ( info ['ebuild'] )
if 'desc_data' in info
self ['desc_data'] = info ['desc_data']
elif 'desc' in info:
self ['desc_data'] = info ['desc']
if 'suggests' in info:
self ['has_suggests'] = info ['suggests']
self._update_lock.release()
# --- end of update (**kw) ---
def _use_filepath ( self, filepath ):
"""auxiliary method for update(**kw)
arguments:
* filepath --
"""
package_file = os.path.basename ( filepath )
# remove .tar.gz .tar.bz2 etc.
filename = re.sub (
config.get ( 'R_PACKAGE.suffix_regex' ) + '$',
'',
package_file
)
package_name, sepa, package_version = filename.partition (
config.get ( 'R_PACKAGE.name_ver_separator', '_' )
)
if not sepa:
# file name unexpected, tarball extraction will (probably) fail
LOGGER.error ( "unexpected file name '%s'." % filename )
raise Exception ( "cannot use file '%s'." % filename )
return
self ['filepath'] = filepath
self ['package_file'] = package_file
self ['package_dir' ] = os.path.dirname ( filepath )
self ['filename'] = filename
self ['package_name'] = package_name
self ['package_version'] = package_version
# --- end of _use_filepath (...) ---
def _use_ebuild ( self, ebuild ):
"""auxiliary method for update(**kw)
arguments:
* ebuild --
"""
self ['ebuild'] = ebuild
# set status to ready for overlay
# this does no longer work FIXME
self ['has_suggests'] = ebuild.has_rsuggests
# todo move Ebuild funcs to here
self ['ebuild_dir'] = ebuild.suggest_dir_name()
self ['ebuild_name'] = ebuild.suggest_name()
# --- end of _use_ebuild (...) ---
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