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-rw-r--r--fg21sim/configs/manager.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/fg21sim/configs/manager.py b/fg21sim/configs/manager.py
index 5ee4ecf..3206c29 100644
--- a/fg21sim/configs/manager.py
+++ b/fg21sim/configs/manager.py
@@ -28,7 +28,10 @@ logger = logging.getLogger(__name__)
def _get_configspec():
"""Found and read all the configuration specifications"""
files = sorted(pkg_resources.resource_listdir(__name__, ""))
- specfiles = filter(lambda fn: fn.endswith(".conf.spec"), files)
+ # NOTE:
+ # Explicit convert the filter results to a list, since the returned
+ # iterator can ONLY be used ONCE.
+ specfiles = list(filter(lambda fn: fn.endswith(".conf.spec"), files))
if os.environ.get("DEBUG_FG21SIM"):
print("DEBUG: Found config specifications: %s" % ", ".join(specfiles),
file=sys.stderr)