diff --git a/synapse/util/stringutils.py b/synapse/util/stringutils.py
index 61d96a6c28..b103c8694c 100644
--- a/synapse/util/stringutils.py
+++ b/synapse/util/stringutils.py
@@ -75,3 +75,22 @@ def shortstr(iterable: Iterable, maxitems: int = 5) -> str:
if len(items) <= maxitems:
return str(items)
return "[" + ", ".join(repr(r) for r in items[:maxitems]) + ", ...]"
+
+
+def strtobool(val: str) -> bool:
+ """Convert a string representation of truth to True or False
+
+ True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values
+ are 'n', 'no', 'f', 'false', 'off', and '0'. Raises ValueError if
+ 'val' is anything else.
+
+ This is lifted from distutils.util.strtobool, with the exception that it actually
+ returns a bool, rather than an int.
+ """
+ val = val.lower()
+ if val in ("y", "yes", "t", "true", "on", "1"):
+ return True
+ elif val in ("n", "no", "f", "false", "off", "0"):
+ return False
+ else:
+ raise ValueError("invalid truth value %r" % (val,))
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