Issue 1646: Block-wise signature computation for large files

1 files changed, 13 insertions, 0 deletions

diff --git a/src/engine/SCons/Script/SConsOptions.py b/src/engine/SCons/Script/SConsOptions.py
index 0e28fd2..d01ec04 100644
--- a/src/engine/SCons/Script/SConsOptions.py
+++ b/src/engine/SCons/Script/SConsOptions.py
@@ -126,6 +126,7 @@ class SConsValues(optparse.Values):
         'help',
         'implicit_cache',
         'max_drift',
+        'md5_chunksize',
         'no_exec',
         'num_jobs',
         'random',
@@ -177,6 +178,11 @@ class SConsValues(optparse.Values):
                 value = int(value)
             except ValueError:
                 raise SCons.Errors.UserError, "An integer is required: %s"%repr(value)
+        elif name == 'md5_chunksize':
+            try:
+                value = int(value)
+            except ValueError:
+                raise SCons.Errors.UserError, "An integer is required: %s"%repr(value)
         elif name == 'warn':
             if SCons.Util.is_String(value):
                 value = [value]
@@ -726,6 +732,13 @@ def Parser(version):
                   help="Set maximum system clock drift to N seconds.",
                   metavar="N")
 
+    op.add_option('--md5-chunksize',
+                  nargs=1, type="int",
+                  dest='md5_chunksize', default=SCons.Node.FS.File.md5_chunksize,
+                  action="store",
+                  help="Set chunk-size for MD5 signature computation to N kilobytes.",
+                  metavar="N")
+
     op.add_option('-n', '--no-exec', '--just-print', '--dry-run', '--recon',
                   dest='no_exec', default=False,
                   action="store_true",