** Also affects: duplicity (Ubuntu Precise)
Importance: Undecided
Status: New
** Also affects: duplicity (Ubuntu Quantal)
Importance: Undecided
Status: New
** Also affects: duplicity (Ubuntu Raring)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1216921
Title:
util.ignore_missing() does not work
Status in Duplicity - Bandwidth Efficient Encrypted Backup:
Confirmed
Status in “duplicity” package in Ubuntu:
Triaged
Status in “duplicity” source package in Precise:
Triaged
Status in “duplicity” source package in Quantal:
Triaged
Status in “duplicity” source package in Raring:
Triaged
Bug description:
duplicity version: 0.6.18-0ubuntu3
python version: 2.7.3
Distro: ubuntu precise 12.04
target file system: ftp
I happen to encounter failed backups with tracebacks like this:
Traceback (most recent call last):
File "/usr/bin/duplicity", line 1403, in <module>
with_tempdir(main)
File "/usr/bin/duplicity", line 1396, in with_tempdir
fn()
File "/usr/bin/duplicity", line 1366, in main
full_backup(col_stats)
File "/usr/bin/duplicity", line 504, in full_backup
sig_outfp.to_remote()
File "/usr/lib/python2.7/dist-packages/duplicity/dup_temp.py", line 184,
in to_remote
globals.backend.move(tgt) #@UndefinedVariable
File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 364, in
move
source_path.delete()
File "/usr/lib/python2.7/dist-packages/duplicity/path.py", line 567, in
delete
util.ignore_missing(os.unlink, self.name)
File "/usr/lib/python2.7/dist-packages/duplicity/util.py", line 116, in
ignore_missing
fn(filename)
OSError: [Errno 2] No such file or directory:
'/BACKUP/.duplycache/duply_foo/duplicity-full-signatures.20130825T140002Z.sigtar.gpg'
Now running test code like
#!/usr/bin/env python
#
# Do what util.ignore_missing(os.unlink, self.name) tries to do and
# fails to achieve
import os
import sys
import errno
if __name__ == "__main__":
try:
os.unlink("/tmp/doesnotexist")
except Exception:
# "type" is a reserved keyword, replaced with "mytype"
mytype, value, tb = sys.exc_info()
print "-" * 78
print "mytype: ", mytype
print "value: ", value
print "value[0]:", value[0]
print "errno.ENOENT: ", errno.ENOENT
print "isinstance(mytype, OSError): ", isinstance(mytype,
OSError)
print "-" * 78
if isinstance(mytype, OSError) and value[0] == errno.ENOENT:
print "Gotcha!"
pass
print "Ooops, missed it ..."
raise
will always raise the exception and not ignore it, because
isinstance(mytype, OSError) is always False.
What I expect ignore_missing to look like is:
def ignore_missing(fn, filename):
"""
Execute fn on filename. Ignore ENOENT errors, otherwise raise exception.
@param fn: callable
@param filename: string
"""
try:
fn(filename)
except OSError, ex:
if ex.errno == errno.ENOENT:
pass
else:
raise
else:
raise
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