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[Bug 1540286] [NEW] deja-dup asks for passphrase over and over again when doing incremental backup, never completes

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Public bug reported:

I’ve been doing backups with deja-dup to an external HDD for several
years without any issue. Yesterday though, after manually triggering a
backup, deja-dup kept on asking me my passphrase over and over again,
after which it would start the "analysis" phase again. The backup would
never actually start.

I re-ran deja-dup from a terminal, and got the following output:

DUPLICITY: INFO 1
DUPLICITY: . GPG error detail: Traceback (most recent call last):
DUPLICITY: .   File "/usr/bin/duplicity", line 1519, in <module>
DUPLICITY: .     with_tempdir(main)
DUPLICITY: .   File "/usr/bin/duplicity", line 1513, in with_tempdir
DUPLICITY: .     fn()
DUPLICITY: .   File "/usr/bin/duplicity", line 1370, in main
DUPLICITY: .     do_backup(action)
DUPLICITY: .   File "/usr/bin/duplicity", line 1391, in do_backup
DUPLICITY: .     sync_archive(decrypt)
DUPLICITY: .   File "/usr/bin/duplicity", line 1179, in sync_archive
DUPLICITY: .     copy_to_local(fn)
DUPLICITY: .   File "/usr/bin/duplicity", line 1124, in copy_to_local
DUPLICITY: .     gpg.GzipWriteFile(src_iter, tdp.name, size=sys.maxsize)
DUPLICITY: .   File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 395, in GzipWriteFile
DUPLICITY: .     new_block = block_iter.next()
DUPLICITY: .   File "/usr/bin/duplicity", line 1104, in next
DUPLICITY: .     self.fileobj.close()
DUPLICITY: .   File "/usr/lib/python2.7/dist-packages/duplicity/dup_temp.py", line 226, in close
DUPLICITY: .     assert not self.fileobj.close()
DUPLICITY: .   File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 256, in close
DUPLICITY: .     self.gpg_failed()
DUPLICITY: .   File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 223, in gpg_failed
DUPLICITY: .     raise GPGError(msg)
DUPLICITY: . GPGError: GPG Failed, see log below:
DUPLICITY: . ===== Begin GnuPG log =====
DUPLICITY: . gpg: CAST5 encrypted data
DUPLICITY: . gpg: encrypted with 1 passphrase
DUPLICITY: . gpg: WARNING: encrypted message has been manipulated!
DUPLICITY: . ===== End GnuPG log =====
DUPLICITY: . 
DUPLICITY: . 

DUPLICITY: ERROR 31 GPGError
DUPLICITY: . GPGError: GPG Failed, see log below:
DUPLICITY: . ===== Begin GnuPG log =====
DUPLICITY: . gpg: CAST5 encrypted data
DUPLICITY: . gpg: encrypted with 1 passphrase
DUPLICITY: . gpg: WARNING: encrypted message has been manipulated!
DUPLICITY: . ===== End GnuPG log =====
DUPLICITY: . 

After poking at different things (including entirely deleting ~/.cache
/deja-dup), I tried backing up to a new folder on the same external HDD,
and the backup completed successfully (obviously it had to do a
completely new backup, which took longer).

So it looks like the previous backup was somehow corrupted, though I
have no idea how that happened.

In any case, deja-dup should detect that error condition and display a
useful error message, instead of asking for the passphrase over and over
again.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: deja-dup 34.0-1ubuntu3
ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6
Uname: Linux 4.2.0-25-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Feb  1 10:58:22 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-11-12 (810 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: deja-dup
UpgradeStatus: Upgraded to wily on 2015-11-01 (91 days ago)

** Affects: deja-dup (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug wily

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https://bugs.launchpad.net/bugs/1540286

Title:
  deja-dup asks for passphrase over and over again when doing
  incremental backup, never completes

Status in deja-dup package in Ubuntu:
  New

Bug description:
  I’ve been doing backups with deja-dup to an external HDD for several
  years without any issue. Yesterday though, after manually triggering a
  backup, deja-dup kept on asking me my passphrase over and over again,
  after which it would start the "analysis" phase again. The backup
  would never actually start.

  I re-ran deja-dup from a terminal, and got the following output:

  DUPLICITY: INFO 1
  DUPLICITY: . GPG error detail: Traceback (most recent call last):
  DUPLICITY: .   File "/usr/bin/duplicity", line 1519, in <module>
  DUPLICITY: .     with_tempdir(main)
  DUPLICITY: .   File "/usr/bin/duplicity", line 1513, in with_tempdir
  DUPLICITY: .     fn()
  DUPLICITY: .   File "/usr/bin/duplicity", line 1370, in main
  DUPLICITY: .     do_backup(action)
  DUPLICITY: .   File "/usr/bin/duplicity", line 1391, in do_backup
  DUPLICITY: .     sync_archive(decrypt)
  DUPLICITY: .   File "/usr/bin/duplicity", line 1179, in sync_archive
  DUPLICITY: .     copy_to_local(fn)
  DUPLICITY: .   File "/usr/bin/duplicity", line 1124, in copy_to_local
  DUPLICITY: .     gpg.GzipWriteFile(src_iter, tdp.name, size=sys.maxsize)
  DUPLICITY: .   File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 395, in GzipWriteFile
  DUPLICITY: .     new_block = block_iter.next()
  DUPLICITY: .   File "/usr/bin/duplicity", line 1104, in next
  DUPLICITY: .     self.fileobj.close()
  DUPLICITY: .   File "/usr/lib/python2.7/dist-packages/duplicity/dup_temp.py", line 226, in close
  DUPLICITY: .     assert not self.fileobj.close()
  DUPLICITY: .   File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 256, in close
  DUPLICITY: .     self.gpg_failed()
  DUPLICITY: .   File "/usr/lib/python2.7/dist-packages/duplicity/gpg.py", line 223, in gpg_failed
  DUPLICITY: .     raise GPGError(msg)
  DUPLICITY: . GPGError: GPG Failed, see log below:
  DUPLICITY: . ===== Begin GnuPG log =====
  DUPLICITY: . gpg: CAST5 encrypted data
  DUPLICITY: . gpg: encrypted with 1 passphrase
  DUPLICITY: . gpg: WARNING: encrypted message has been manipulated!
  DUPLICITY: . ===== End GnuPG log =====
  DUPLICITY: . 
  DUPLICITY: . 

  DUPLICITY: ERROR 31 GPGError
  DUPLICITY: . GPGError: GPG Failed, see log below:
  DUPLICITY: . ===== Begin GnuPG log =====
  DUPLICITY: . gpg: CAST5 encrypted data
  DUPLICITY: . gpg: encrypted with 1 passphrase
  DUPLICITY: . gpg: WARNING: encrypted message has been manipulated!
  DUPLICITY: . ===== End GnuPG log =====
  DUPLICITY: . 

  After poking at different things (including entirely deleting ~/.cache
  /deja-dup), I tried backing up to a new folder on the same external
  HDD, and the backup completed successfully (obviously it had to do a
  completely new backup, which took longer).

  So it looks like the previous backup was somehow corrupted, though I
  have no idea how that happened.

  In any case, deja-dup should detect that error condition and display a
  useful error message, instead of asking for the passphrase over and
  over again.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: deja-dup 34.0-1ubuntu3
  ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6
  Uname: Linux 4.2.0-25-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Feb  1 10:58:22 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-11-12 (810 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  SourcePackage: deja-dup
  UpgradeStatus: Upgraded to wily on 2015-11-01 (91 days ago)

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