diff options
| -rw-r--r-- | lib/bb/utils.py | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/lib/bb/utils.py b/lib/bb/utils.py index c540b49cf..f75312399 100644 --- a/lib/bb/utils.py +++ b/lib/bb/utils.py @@ -523,12 +523,17 @@ def md5_file(filename): """ Return the hex string representation of the MD5 checksum of filename. """ - import hashlib - m = hashlib.md5() + import hashlib, mmap with open(filename, "rb") as f: - for line in f: - m.update(line) + m = hashlib.md5() + try: + with mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ) as mm: + for chunk in iter(lambda: mm.read(8192), b''): + m.update(chunk) + except ValueError: + # You can't mmap() an empty file so silence this exception + pass return m.hexdigest() def sha256_file(filename): |