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Rev1800, Use -tmpnew and -tmpold postfix for atomic write

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shortcutme 2017-01-05 03:03:17 +01:00
parent 5c2b90c20f
commit 431415c052
2 changed files with 10 additions and 10 deletions
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16
src/util/helper.py
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@ -15,16 +15,16 @@ from Config import config
def atomicWrite(dest, content, mode="w"):
try:
permissions = stat.S_IMODE(os.lstat(dest).st_mode)
with open(dest + "-new", mode) as f:
with open(dest + "-tmpnew", mode) as f:
f.write(content)
f.flush()
os.fsync(f.fileno())
if os.path.isfile(dest + "-old"): # Previous incomplete write
os.rename(dest + "-old", dest + "-old-%s" % time.time())
os.rename(dest, dest + "-old")
os.rename(dest + "-new", dest)
if os.path.isfile(dest + "-tmpold"): # Previous incomplete write
os.rename(dest + "-tmpold", dest + "-tmpold-%s" % time.time())
os.rename(dest, dest + "-tmpold")
os.rename(dest + "-tmpnew", dest)
os.chmod(dest, permissions)
os.unlink(dest + "-old")
os.unlink(dest + "-tmpold")
return True
except Exception, err:
from Debug import Debug
@ -32,8 +32,8 @@ def atomicWrite(dest, content, mode="w"):
"File %s write failed: %s, reverting..." %
(dest, Debug.formatException(err))
)
if os.path.isfile(dest + "-old") and not os.path.isfile(dest):
os.rename(dest + "-old", dest)
if os.path.isfile(dest + "-tmpold") and not os.path.isfile(dest):
os.rename(dest + "-tmpold", dest)
return False