duplicityBackup: Could not connect to remote using SSH password

[C-Duv]

Attempts to backup to a remote SSH storage using login/password fails:

[DEBUG] 2014-10-13 09:35:25 UTC - Duplicity backup will be ran with following command line:
[DEBUG] 2014-10-13 09:35:25 UTC - /usr/bin/duplicity incremental --archive-dir "/var/backups/duplicityArchiveDir" --exclude-if-present ".cc_skip_save" --verbosity 8 --f
ull-if-older-than 10D --volsize 200 "/root" "ssh://backup-user@server.example.com:22/backups/fs/root"
[DEBUG] 2014-10-13 09:35:27 UTC - $actionResult{exitCode} = 23
[DEBUG] 2014-10-13 09:35:27 UTC - $actionResult{stdout} =
[DEBUG] 2014-10-13 09:35:27 UTC - Utilisation du répertoire d’archive : /var/backups/duplicityArchiveDir/cca2953bb06fb8cdd072aaad8a4329c4
Utilisation du nom de sauvegarde : cca2953bb06fb8cdd072aaad8a4329c4
Import of duplicity.backends.ftpbackend Succeeded
Import of duplicity.backends.tahoebackend Succeeded
Import of duplicity.backends.localbackend Succeeded
Import of duplicity.backends.botobackend Succeeded
Import of duplicity.backends.rsyncbackend Succeeded
Import of duplicity.backends.giobackend Succeeded
Import of duplicity.backends.hsibackend Succeeded
Import of duplicity.backends.ftpsbackend Succeeded
Import of duplicity.backends.gdocsbackend Succeeded
Import of duplicity.backends.imapbackend Succeeded
Import of duplicity.backends.u1backend Succeeded
Import of duplicity.backends.sshbackend Succeeded
Import of duplicity.backends.webdavbackend Succeeded
Import of duplicity.backends.cloudfilesbackend Succeeded
Using temporary directory /tmp/duplicity-W8dPac-tempdir
Détails de l’erreur de sauvegarde : Traceback (most recent call last):
File "/usr/bin/duplicity", line 1404, in
with_tempdir(main)
File "/usr/bin/duplicity", line 1397, in with_tempdir
fn()
File "/usr/bin/duplicity", line 1248, in main
action = commandline.ProcessCommandLine(sys.argv[1:])
File "/usr/lib/python2.7/dist-packages/duplicity/commandline.py", line 1007, in ProcessCommandLine
backup, local_pathname = set_backend(args[0], args[1])
File "/usr/lib/python2.7/dist-packages/duplicity/commandline.py", line 900, in set_backend
globals.backend = backend.get_backend(bend)
File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 158, in get_backend
return _backendspu.scheme
File "/usr/lib/python2.7/dist-packages/duplicity/backends/sshbackend.py", line 140, in init
raise BackendException("ssh connection to %s:%d failed: %s" % (parsed_url.hostname,portnumber,e))
BackendException: ssh connection to server.example.com:22 failed: Authentication failed.

[DEBUG] 2014-10-13 09:35:27 UTC - $actionResult{stderr} =
[DEBUG] 2014-10-13 09:35:27 UTC - ssh: Connected (version 2.0, client OpenSSH_6.0p1)
ssh: Authentication (publickey) failed.
BackendException: ssh connection to server.example.com:22 failed: Authentication failed.

[DEBUG] 2014-10-13 09:35:27 UTC - --- /execDuplicity("incremental", $options, "/root", "ssh://backup-user@server.example.com:22/backups/fs/root") ---
[ERROR] 2014-10-13 09:35:27 UTC - An error occurred during backup of "/root" to Storage "secureArchiveNas" (exitcode = 23)
[ERROR] 2014-10-13 09:35:27 UTC - STDOUT: Utilisation du répertoire d’archive : /var/backups/duplicityArchiveDir/cca2953bb06fb8cdd072aaad8a4329c4
Utilisation du nom de sauvegarde : cca2953bb06fb8cdd072aaad8a4329c4
Import of duplicity.backends.ftpbackend Succeeded
Import of duplicity.backends.tahoebackend Succeeded
Import of duplicity.backends.localbackend Succeeded
Import of duplicity.backends.botobackend Succeeded
Import of duplicity.backends.rsyncbackend Succeeded
Import of duplicity.backends.giobackend Succeeded
Import of duplicity.backends.hsibackend Succeeded
Import of duplicity.backends.ftpsbackend Succeeded
Import of duplicity.backends.gdocsbackend Succeeded
Import of duplicity.backends.imapbackend Succeeded
Import of duplicity.backends.u1backend Succeeded
Import of duplicity.backends.sshbackend Succeeded
Import of duplicity.backends.webdavbackend Succeeded
Import of duplicity.backends.cloudfilesbackend Succeeded
Using temporary directory /tmp/duplicity-W8dPac-tempdir
Détails de l’erreur de sauvegarde : Traceback (most recent call last):
File "/usr/bin/duplicity", line 1404, in
with_tempdir(main)
File "/usr/bin/duplicity", line 1397, in with_tempdir
fn()
File "/usr/bin/duplicity", line 1248, in main
action = commandline.ProcessCommandLine(sys.argv[1:])
File "/usr/lib/python2.7/dist-packages/duplicity/commandline.py", line 1007, in ProcessCommandLine
backup, local_pathname = set_backend(args[0], args[1])
File "/usr/lib/python2.7/dist-packages/duplicity/commandline.py", line 900, in set_backend
globals.backend = backend.get_backend(bend)
File "/usr/lib/python2.7/dist-packages/duplicity/backend.py", line 158, in get_backend
return _backendspu.scheme
File "/usr/lib/python2.7/dist-packages/duplicity/backends/sshbackend.py", line 140, in init
raise BackendException("ssh connection to %s:%d failed: %s" % (parsed_url.hostname,portnumber,e))
BackendException: ssh connection to server.example.com:22 failed: Authentication failed.

[ERROR] 2014-10-13 09:35:27 UTC - STDERR: ssh: Connected (version 2.0, client OpenSSH_6.0p1)
ssh: Authentication (publickey) failed.
BackendException: ssh connection to server.example.com:22 failed: Authentication failed.

[DEBUG] 2014-10-13 09:35:27 UTC - --- /executeDuplicityPathBackup("localDisk", "/root", secureArchiveNas, $storage) ---
[DEBUG] 2014-10-13 09:35:27 UTC - [Backup:localDisk#/root -> secureArchiveNas] ERROR

According to pexpect backend does not use FTP_PASSWORD without --ssh-askpass flag, the FTP_PASSWORD environment variable is ignored in some cases: maybe this is also the case here.

[C-Duv]

Fixed by merging #11