diff options
Diffstat (limited to 'engine/SCons/CacheDir.py')
| -rw-r--r-- | engine/SCons/CacheDir.py | 77 |
1 files changed, 68 insertions, 9 deletions
diff --git a/engine/SCons/CacheDir.py b/engine/SCons/CacheDir.py index 086d44d..05199d9 100644 --- a/engine/SCons/CacheDir.py +++ b/engine/SCons/CacheDir.py @@ -1,5 +1,5 @@ # -# Copyright (c) 2001 - 2015 The SCons Foundation +# Copyright (c) 2001 - 2016 The SCons Foundation # # Permission is hereby granted, free of charge, to any person obtaining # a copy of this software and associated documentation files (the @@ -21,17 +21,19 @@ # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # -__revision__ = "src/engine/SCons/CacheDir.py rel_2.4.1:3453:73fefd3ea0b0 2015/11/09 03:25:05 bdbaddog" +__revision__ = "src/engine/SCons/CacheDir.py rel_2.5.0:3543:937e55cd78f7 2016/04/09 11:29:54 bdbaddog" __doc__ = """ CacheDir support """ -import os.path +import json +import os import stat import sys import SCons.Action +import SCons.Warnings cache_enabled = True cache_debug = False @@ -71,7 +73,8 @@ CacheRetrieve = SCons.Action.Action(CacheRetrieveFunc, CacheRetrieveString) CacheRetrieveSilent = SCons.Action.Action(CacheRetrieveFunc, None) def CachePushFunc(target, source, env): - if cache_readonly: return + if cache_readonly: + return t = target[0] if t.nocache: @@ -124,6 +127,10 @@ def CachePushFunc(target, source, env): CachePush = SCons.Action.Action(CachePushFunc, None) +# Nasty hack to cut down to one warning for each cachedir path that needs +# upgrading. +warned = dict() + class CacheDir(object): def __init__(self, path): @@ -132,11 +139,63 @@ class CacheDir(object): except ImportError: msg = "No hashlib or MD5 module available, CacheDir() not supported" SCons.Warnings.warn(SCons.Warnings.NoMD5ModuleWarning, msg) - self.path = None - else: - self.path = path + path = None + self.path = path self.current_cache_debug = None self.debugFP = None + self.config = dict() + if path is None: + return + # See if there's a config file in the cache directory. If there is, + # use it. If there isn't, and the directory exists and isn't empty, + # produce a warning. If the directory doesn't exist or is empty, + # write a config file. + config_file = os.path.join(path, 'config') + if not os.path.exists(config_file): + # A note: There is a race hazard here, if two processes start and + # attempt to create the cache directory at the same time. However, + # python doesn't really give you the option to do exclusive file + # creation (it doesn't even give you the option to error on opening + # an existing file for writing...). The ordering of events here + # as an attempt to alleviate this, on the basis that it's a pretty + # unlikely occurence (it'd require two builds with a brand new cache + # directory) + if os.path.isdir(path) and len(os.listdir(path)) != 0: + self.config['prefix_len'] = 1 + # When building the project I was testing this on, the warning + # was output over 20 times. That seems excessive + global warned + if self.path not in warned: + msg = "Please upgrade your cache by running " +\ + " scons-configure-cache.py " + self.path + SCons.Warnings.warn(SCons.Warnings.CacheVersionWarning, msg) + warned[self.path] = True + else: + if not os.path.isdir(path): + try: + os.makedirs(path) + except OSError: + # If someone else is trying to create the directory at + # the same time as me, bad things will happen + msg = "Failed to create cache directory " + path + raise SCons.Errors.EnvironmentError(msg) + + self.config['prefix_len'] = 2 + if not os.path.exists(config_file): + try: + with open(config_file, 'w') as config: + json.dump(self.config, config) + except: + msg = "Failed to write cache configuration for " + path + raise SCons.Errors.EnvironmentError(msg) + else: + try: + with open(config_file) as config: + self.config = json.load(config) + except ValueError: + msg = "Failed to read cache configuration for " + path + raise SCons.Errors.EnvironmentError(msg) + def CacheDebug(self, fmt, target, cachefile): if cache_debug != self.current_cache_debug: @@ -151,7 +210,7 @@ class CacheDir(object): self.debugFP.write(fmt % (target, os.path.split(cachefile)[1])) def is_enabled(self): - return (cache_enabled and not self.path is None) + return cache_enabled and not self.path is None def is_readonly(self): return cache_readonly @@ -163,7 +222,7 @@ class CacheDir(object): return None, None sig = node.get_cachedir_bsig() - subdir = sig[0].upper() + subdir = sig[:self.config['prefix_len']].upper() dir = os.path.join(self.path, subdir) return dir, os.path.join(dir, sig) |