class Configuration(object):
def __init__(self, output_path, all_configs=None):
# We want to make sure to construct only one copy of each config, even
# if configs refer to each other or multiple configs refer to a shared
# config. So, all_configs maps names to configs that we have already
# constructed.
if all_configs is None:
# Note that if we just make all_configs default to {} in the method
# signature, then Python will create a single empty map to use as the
# default value for all calls rather than create a new one every call.
# Since we modify all_configs during this method, we would be modifying
# the shared default value, which would be bad. If you don't understand
# what I mean, try typing the following into the interpreter and then
# calling it several times with no argument:
# def f(l = []):
# l.append("foo")
# return l
# Ouchies.
all_configs = {}
if output_path is None:
all_configs[""] = self
else:
all_configs[output_path] = self
self.name = output_path
self.source_dir = DiskDirectory(".")
if output_path is None:
self.output_dir = self.source_dir
else:
self.source_dir.mkdir(output_path)
self.output_dir = DiskDirectory(output_path)
self.mem_dir = VirtualDirectory()
self.env_dir = VirtualDirectory()
_restore_pickle(self.mem_dir, self.output_dir, "mem.pickle")
_restore_pickle(self.env_dir, self.output_dir, "env.pickle")
self.alt_configs = {}
self.__make_root_dir()
self.alt_configs["host"] = self
if self.env_dir.exists("$mappings"):
mappings = self.env_dir.read("$mappings").split(":")
for mapping in mappings:
if mapping == "":
continue
alias, name = mapping.split("=", 1)
if name in all_configs:
self.alt_configs[alias] = all_configs[name]
else:
if name == "":
name = None
self.alt_configs[alias] = Configuration(name, all_configs)
def __make_root_dir(self):
self.mapping = _WorkingDirMapping(self.source_dir, self.output_dir,
self.mem_dir, self.env_dir,
self.alt_configs)
self.root_dir = MappedDirectory(self.mapping)
def save(self):
if not self.mem_dir.empty():
_save_pickle(self.mem_dir, self.root_dir, "mem.pickle")
if not self.env_dir.empty():
_save_pickle(self.env_dir, self.root_dir, "env.pickle")
def getenv(self, name):
if self.root_dir.read("env/set/" + name) == "true":
return self.root_dir.read("env/" + name)
else:
return None
def clean(self, expunge=False):
for dir in ["tmp", "bin", "lib", "share", "include", "mem", "env"]:
if self.root_dir.exists(dir):
shutil.rmtree(self.root_dir.get_disk_path(dir))
for file in ["mem.pickle", "env.pickle"]:
if self.root_dir.exists(file):
os.remove(self.root_dir.get_disk_path(file))
self.mem_dir = VirtualDirectory()
if expunge:
# Try to remove the output directory itself -- will fail if not empty.
outdir = self.root_dir.get_disk_path(".")
if outdir.endswith("/."):
# rmdir doesn't like a trailing "/.".
outdir = outdir[:-2]
try:
os.rmdir(outdir)
except os.error:
pass
else:
# Restore the parts of env.pickle that were set explicitly.
new_env_dir = VirtualDirectory()
if self.env_dir.exists("$mappings"):
new_env_dir.write("$mappings", self.env_dir.read("$mappings"))
if self.env_dir.exists("$config"):
locked_vars = self.env_dir.read("$config")
new_env_dir.write("$config", locked_vars)
for var in locked_vars.split(","):
if var != "":
new_env_dir.write(var, self.env_dir.read(var))
new_env_dir.write("set/" + var,
self.env_dir.read("set/" + var))
self.env_dir = new_env_dir
self.__make_root_dir()
def get_all_linked_configs(self):
result = set()
self.__get_all_linked_configs_recursive(result)
return result
def __get_all_linked_configs_recursive(self, result):
if self in result:
return
result.add(self)
for link in self.alt_configs.values():
link.__get_all_linked_configs_recursive(result)
class Configuration(object):
def __init__(self, output_path, all_configs = None):
# We want to make sure to construct only one copy of each config, even
# if configs refer to each other or multiple configs refer to a shared
# config. So, all_configs maps names to configs that we have already
# constructed.
if all_configs is None:
# Note that if we just make all_configs default to {} in the method
# signature, then Python will create a single empty map to use as the
# default value for all calls rather than create a new one every call.
# Since we modify all_configs during this method, we would be modifying
# the shared default value, which would be bad. If you don't understand
# what I mean, try typing the following into the interpreter and then
# calling it several times with no argument:
# def f(l = []):
# l.append("foo")
# return l
# Ouchies.
all_configs = {}
if output_path is None:
all_configs[""] = self
else:
all_configs[output_path] = self
self.name = output_path
self.source_dir = DiskDirectory(".")
if output_path is None:
self.output_dir = self.source_dir
else:
self.source_dir.mkdir(output_path)
self.output_dir = DiskDirectory(output_path)
self.mem_dir = VirtualDirectory()
self.env_dir = VirtualDirectory()
_restore_pickle(self.mem_dir, self.output_dir, "mem.pickle")
_restore_pickle(self.env_dir, self.output_dir, "env.pickle")
self.alt_configs = {}
self.__make_root_dir()
self.alt_configs["host"] = self
if self.env_dir.exists("$mappings"):
mappings = self.env_dir.read("$mappings").split(":")
for mapping in mappings:
if mapping == "":
continue
alias, name = mapping.split("=", 1)
if name in all_configs:
self.alt_configs[alias] = all_configs[name]
else:
if name == "":
name = None
self.alt_configs[alias] = Configuration(name, all_configs)
def __make_root_dir(self):
self.mapping = _WorkingDirMapping(self.source_dir, self.output_dir,
self.mem_dir, self.env_dir,
self.alt_configs)
self.root_dir = MappedDirectory(self.mapping)
def save(self):
if not self.mem_dir.empty():
_save_pickle(self.mem_dir, self.root_dir, "mem.pickle")
if not self.env_dir.empty():
_save_pickle(self.env_dir, self.root_dir, "env.pickle")
def getenv(self, name):
if self.root_dir.read("env/set/" + name) == "true":
return self.root_dir.read("env/" + name)
else:
return None
def clean(self, expunge=False):
for dir in ["tmp", "bin", "lib", "share", "include", "mem", "env"]:
if self.root_dir.exists(dir):
shutil.rmtree(self.root_dir.get_disk_path(dir))
for file in [ "mem.pickle", "env.pickle" ]:
if self.root_dir.exists(file):
os.remove(self.root_dir.get_disk_path(file))
self.mem_dir = VirtualDirectory()
if expunge:
# Try to remove the output directory itself -- will fail if not empty.
outdir = self.root_dir.get_disk_path(".")
if outdir.endswith("/."):
# rmdir doesn't like a trailing "/.".
outdir = outdir[:-2]
try:
os.rmdir(outdir)
except os.error:
pass
else:
# Restore the parts of env.pickle that were set explicitly.
new_env_dir = VirtualDirectory()
if self.env_dir.exists("$mappings"):
new_env_dir.write("$mappings", self.env_dir.read("$mappings"))
if self.env_dir.exists("$config"):
locked_vars = self.env_dir.read("$config")
new_env_dir.write("$config", locked_vars)
for var in locked_vars.split(","):
if var != "":
new_env_dir.write(var, self.env_dir.read(var))
new_env_dir.write("set/" + var,
self.env_dir.read("set/" + var))
self.env_dir = new_env_dir
self.__make_root_dir()
def get_all_linked_configs(self):
result = set()
self.__get_all_linked_configs_recursive(result)
return result
def __get_all_linked_configs_recursive(self, result):
if self in result:
return
result.add(self)
for link in self.alt_configs.values():
link.__get_all_linked_configs_recursive(result)
