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- #!/usr/bin/env python3
- import sys
- import os
- import hashlib
- def hash_file(fname):
- if not os.path.exists(fname):
- return b""
- hasher = hashlib.md5()
- with open(fname, "rb") as f:
- hasher.update(f.read())
- return hasher.digest()
- old_digest = hash_file(sys.argv[3])
- with open(sys.argv[3] + ".tmp", "wb") as f:
- f.write(open(sys.argv[1], "rb").read())
- if os.path.exists(sys.argv[2]):
- f.write(open(sys.argv[2], "rb").read())
- new_digest = hash_file(sys.argv[3] + ".tmp")
- if new_digest != old_digest:
- print("Replacing")
- os.rename(sys.argv[3] + ".tmp", sys.argv[3])
- else:
- os.remove(sys.argv[3] + ".tmp")
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