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made copy atomic by creating tmp file in dest location (ensures same partition)

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uses pid and epoch to prevent collisions, good enough for most cases
Signed-off-by: Brian Coca <briancoca+ansible@gmail.com>
This commit is contained in:
Brian Coca 2012-09-11 17:53:43 -04:00
parent e7eab93243
commit f5481621f8
1 changed files with 6 additions and 1 deletions
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7
library/copy
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@ -20,6 +20,7 @@
import os import os
import shutil import shutil
import time
def main(): def main():
@ -64,7 +65,11 @@ def main():
if backup: if backup:
if os.path.exists(dest): if os.path.exists(dest):
backup_file = module.backup_local(dest) backup_file = module.backup_local(dest)
shutil.copyfile(src, dest) #TODO:pid + epoch should avoid most collisions, hostname/mac for those using nfs?
# might be an issue with exceeding path length
dest_tmp = "%s.%s.%s.tmp" % (dest,os.getpid(),time.gmtime)
shutil.copyfile(src, dest_tmp)
shutil.copyfile(dest_tmp, dest)
except shutil.Error: except shutil.Error:
module.fail_json(msg="failed to copy: %s and %s are the same" % (src, dest)) module.fail_json(msg="failed to copy: %s and %s are the same" % (src, dest))
except IOError: except IOError: