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diff --git a/usr/src/tools/onbld/Scm/Ignore.py b/usr/src/tools/onbld/Scm/Ignore.py
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+++ b/usr/src/tools/onbld/Scm/Ignore.py
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+#
+# 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
+#
+# Copyright (c) 2013, Joyent Inc. All rights reserved.
+#
+
+'''
+Process our ignore/exception_list file format.
+
+The format is broadly similar, if not identical, to .gitignore and .hgignore
+files.
+'''
+
+import re
+import fnmatch
+
+RE_SYNTAX = re.compile(r'^syntax:\s*(.*)\s*$')
+
+#
+# It is important that this module not rely on Mercurial
+#
+
+def _read_ignore_file(ignorefile):
+    '''Read an ignore file and return an array of regular expressions
+    to match ignored paths.'''
+
+    syntax = 'regex'
+    ignore_list = []
+    lc = 0
+
+    with open(ignorefile, 'r') as f:
+        for l in f:
+            lc += 1
+            # Remove comments and blank lines
+            l = l.split('#', 2)[0].strip()
+            if l == '':
+                continue
+            # Process "syntax:" lines
+            m = RE_SYNTAX.match(l)
+            if m:
+                syntax = m.group(1)
+                continue
+            # All other lines are considered patterns
+            if (syntax == 'glob'):
+                ignore_list.append(re.compile('.*' + fnmatch.translate(l)))
+            elif (syntax == 'regex'):
+                ignore_list.append(re.compile(l))
+            else:
+                raise Exception('%s:%d: syntax "%s" is not supported' %
+                    (ignorefile, lc, syntax))
+
+    return ignore_list
+
+def ignore(root, ignorefiles):
+    # If we aren't provided any ignore files, we'll never ignore
+    # any paths:
+    if (len(ignorefiles) < 1):
+        return lambda x: False
+
+    ignore_list = []
+    for ignorefile in ignorefiles:
+        ignore_list.extend(_read_ignore_file(ignorefile))
+
+    # If the ignore files contained no patterns, we'll never ignore
+    # any paths:
+    if (len(ignore_list) < 1):
+        return lambda x: False
+
+    def _ignore_func(path):
+        for regex in ignore_list:
+            if (regex.match(path)):
+                return True
+        return False
+
+    return _ignore_func