support for --cache-readonly

Setting this will fetch data from the cache but won't update it.

3 files changed, 15 insertions, 1 deletions

diff --git a/src/engine/SCons/CacheDir.py b/src/engine/SCons/CacheDir.py
index 3516018..9dd18e5 100644
--- a/src/engine/SCons/CacheDir.py
+++ b/src/engine/SCons/CacheDir.py
@@ -37,6 +37,7 @@ cache_enabled = True
 cache_debug = False
 cache_force = False
 cache_show = False
+cache_readonly = False
 
 def CacheRetrieveFunc(target, source, env):
     t = target[0]
@@ -70,6 +71,8 @@ CacheRetrieve = SCons.Action.Action(CacheRetrieveFunc, CacheRetrieveString)
 CacheRetrieveSilent = SCons.Action.Action(CacheRetrieveFunc, None)
 
 def CachePushFunc(target, source, env):
+    if cache_readonly: return
+
     t = target[0]
     if t.nocache:
         return
@@ -150,6 +153,9 @@ class CacheDir(object):
     def is_enabled(self):
         return (cache_enabled and not self.path is None)
 
+    def is_readonly(self):
+        return cache_readonly
+
     def cachepath(self, node):
         """
         """
@@ -201,7 +207,7 @@ class CacheDir(object):
         return False
 
     def push(self, node):
-        if not self.is_enabled():
+        if self.is_readonly() or not self.is_enabled():
             return
         return CachePush(node, [], node.get_build_env())
 
diff --git a/src/engine/SCons/Script/Main.py b/src/engine/SCons/Script/Main.py
index 837c103..fea0916 100644
--- a/src/engine/SCons/Script/Main.py
+++ b/src/engine/SCons/Script/Main.py
@@ -1089,6 +1089,7 @@ def _build_targets(fs, options, targets, target_top):
         SCons.Node.FS.set_diskcheck(options.diskcheck)
 
     SCons.CacheDir.cache_enabled = not options.cache_disable
+    SCons.CacheDir.cache_readonly = options.cache_readonly
     SCons.CacheDir.cache_debug = options.cache_debug
     SCons.CacheDir.cache_force = options.cache_force
     SCons.CacheDir.cache_show = options.cache_show
diff --git a/src/engine/SCons/Script/SConsOptions.py b/src/engine/SCons/Script/SConsOptions.py
index c1f389a..62033ba 100644
--- a/src/engine/SCons/Script/SConsOptions.py
+++ b/src/engine/SCons/Script/SConsOptions.py
@@ -564,6 +564,11 @@ def Parser(version):
                   action="store_true",
                   help="Copy already-built targets into the CacheDir.")
 
+    op.add_option('--cache-readonly',
+                  dest='cache_readonly', default=False,
+                  action="store_true",
+                  help="Do not update CacheDir with built targets.")
+
     op.add_option('--cache-show',
                   dest='cache_show', default=False,
                   action="store_true",
@@ -579,8 +584,10 @@ def Parser(version):
         if not value in c_options:
             raise OptionValueError(opt_invalid('config', value, c_options))
         setattr(parser.values, option.dest, value)
+
     opt_config_help = "Controls Configure subsystem: %s." \
                       % ", ".join(config_options)
+
     op.add_option('--config',
                   nargs=1, type="string",
                   dest="config", default="auto",