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"""SCons.Sig
The Signature package for the scons software construction utility.
"""
#
# Copyright (c) 2001 Steven Knight
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import os.path
import string
#XXX Get rid of the global array so this becomes re-entrant.
sig_files = []
def write():
global sig_files
for sig_file in sig_files:
sig_file.write()
class SConsignFile:
"""
Encapsulates reading and writing a .sconsign file.
"""
def __init__(self, dir, module):
"""
dir - the directory for the file
module - the signature module being used
"""
self.path = os.path.join(dir, '.sconsign')
self.entries = {}
try:
file = open(self.path, 'rt')
except:
pass
else:
for line in file.readlines():
filename, rest = map(string.strip, string.split(line, ":"))
time, signature = map(string.strip, string.split(rest, " "))
self.entries[filename] = (int(time), module.from_string(signature))
global sig_files
sig_files.append(self)
def get(self, filename):
"""
Get the signature for a file
filename - the filename whose signature will be returned
returns - (timestamp, signature)
"""
try:
return self.entries[filename]
except KeyError:
return (0, None)
def set(self, filename, timestamp, signature, module):
"""
Set the signature for a file
filename - the filename whose signature will be set
timestamp - the timestamp
signature - the signature
module - the signature module being used
"""
self.entries[filename] = (timestamp, module.to_string(signature))
def write(self):
"""
Write the .sconsign file to disk.
"""
file = open(self.path, 'wt')
for item in self.entries.items():
file.write("%s: %d %s\n" % (item[0], item[1][0], item[1][1]))
class Calculator:
"""
Encapsulates signature calculations and .sconsign file generating
for the build engine.
"""
def __init__(self, module):
"""
Initialize the calculator.
module - the signature module to use for signature calculations
"""
self.module = module
def collect(self, node):
"""
Collect the signatures of a node's sources.
node - the node whose sources will be collected
This no longer handles the recursive descent of the
node's children's signatures. We expect that they're
already built and updated by someone else, if that's
what's wanted.
"""
sigs = map(lambda n,s=self: s.get_signature(n), node.children())
return self.module.collect(filter(lambda x: not x is None, sigs))
def get_signature(self, node):
"""
Get the signature for a node.
node - the node
returns - the signature or None if the signature could not
be computed.
This method does not store the signature in the node and
in the .sconsign file.
"""
if not node.use_signature:
# This node type doesn't use a signature (e.g. a
# directory) so bail right away.
return None
elif node.has_signature():
sig = node.get_signature()
elif node.builder:
sig = self.collect(node)
else:
if not node.exists():
return None
# XXX handle nodes that are not under the source root
sig = self.module.signature(node)
return sig
def current(self, node, newsig):
"""
Check if a node is up to date.
node - the node whose signature will be checked
returns - 0 if the signature has changed since the last invocation,
and 1 if it hasn't
"""
c = node.current()
if not c is None:
# The node itself has told us whether or not it's
# current without checking the signature. The
# canonical uses here are a "0" return for a file
# that doesn't exist, or a directory.
return c
oldtime, oldsig = node.get_oldentry()
newtime = node.get_timestamp()
if not node.builder and newtime == oldtime:
newsig = oldsig
return self.module.current(newsig, oldsig)
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