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-rw-r--r--pym/cache/flat_hash.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/pym/cache/flat_hash.py b/pym/cache/flat_hash.py
index 722e9f184..d4c5930c7 100644
--- a/pym/cache/flat_hash.py
+++ b/pym/cache/flat_hash.py
@@ -26,7 +26,10 @@ class database(fs_template.FsBased):
myf = open(fp, "r")
try:
d = self._parse_data(myf, cpv)
- d["_mtime_"] = long(os.fstat(myf.fileno()).st_mtime)
+ if "_mtime_" not in d:
+ """Backward compatibility with old cache that uses mtime
+ mangling."""
+ d["_mtime_"] = long(os.fstat(myf.fileno()).st_mtime)
return d
finally:
myf.close()