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-rw-r--r--src/engine/SCons/CacheDir.py77
1 files changed, 68 insertions, 9 deletions
diff --git a/src/engine/SCons/CacheDir.py b/src/engine/SCons/CacheDir.py
index 086d44d..05199d9 100644
--- a/src/engine/SCons/CacheDir.py
+++ b/src/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)