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according to T'so, this is the correct way to do atomic writes in a file (http://thunk.org/tytso/blog/2009/03/15/dont-fear-the-fsync/)

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Joël Schaerer 2009-03-17 10:39:00 +01:00
parent 29046f4dce
commit 3bd45e5304
1 changed files with 8 additions and 3 deletions
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autojump
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@ -32,9 +32,14 @@ def match(path,pattern,path_dict,re_flags=0):
return False
def save(path_dict,dic_file):
cPickle.dump(path_dict,open(dic_file+".tmp",'w'),-1)
import shutil
shutil.copy(dic_file+".tmp",dic_file) #cPickle.dump doesn't seem to be atomic, so this is more secure
f=open(dic_file+".tmp",'w')
cPickle.dump(path_dict,f,-1)
f.flush()
os.fsync(f)
f.close()
os.rename(dic_file+".tmp",dic_file) #cf. http://thunk.org/tytso/blog/2009/03/15/dont-fear-the-fsync/
#import shutil
#shutil.copy(dic_file+".tmp",dic_file) #cPickle.dump doesn't seem to be atomic, so this is more secure
def forget(path_dict,dic_file):
"""Gradually forget about directories. Only call from the actual jump since it can take time"""