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[Bug 1665694] [NEW] cc_set_passwords fails to change passwords specified as chpasswd['list'] in cloud-config

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Public bug reported:

If cloud-config contains list of user:password pairs as in example below

chpasswd:
  list:
    - user1:pwd001
    - user2:pwd002

cc_set_passwords module fails to change passwords with error:
Feb 17 15:52:48 si-man [CLOUDINIT] stages.py[DEBUG]: Running module set-passwords (<module 'cloudinit.config.cc_set_passwords' from '/usr/lib/python3/dist-packages/cloudinit/config/cc_set_passwords.py'>) with frequency once-per-instance
Feb 17 15:52:48 si-man [CLOUDINIT] handlers.py[DEBUG]: start: modules-config/config-set-passwords: running config-set-passwords with frequency once-per-instance
Feb 17 15:52:48 si-man [CLOUDINIT] util.py[DEBUG]: Writing to /var/lib/cloud/instances/6d822e81-98a1-4b43-bed2-db8d0cf045bb/sem/config_set_passwords - wb: [420] 25 bytes
Feb 17 15:52:48 si-man [CLOUDINIT] helpers.py[DEBUG]: Running config-set-passwords using lock (<FileLock using file '/var/lib/cloud/instances/6d822e81-98a1-4b43-bed2-db8d0cf045bb/sem/config_set_passwords'>)
Feb 17 15:52:48 si-man [CLOUDINIT] cc_set_passwords.py[DEBUG]: Changing password for ["['user1"]:
Feb 17 15:52:48 si-man [CLOUDINIT] util.py[DEBUG]: Running command ['chpasswd'] with allowed return codes [0] (shell=False, capture=True)
Feb 17 15:52:48 si-man [CLOUDINIT] util.py[WARNING]: Failed to set passwords with chpasswd for ["['user1"]
Feb 17 15:52:48 si-man [CLOUDINIT] util.py[DEBUG]: Failed to set passwords with chpasswd for ["['user1"]#012Traceback (most recent call last):#012  File "/usr/lib/python3/dist-packages/cloudinit/config/cc_set_passwords.py", line 121, in handle#012    util.subp(['chpasswd'], ch_in)#012  File "/usr/lib/python3/dist-packages/cloudinit/util.py", line 1836, in subp#012    cmd=args)#012cloudinit.util.ProcessExecutionError: Unexpected error while running command.#012Command: ['chpasswd']#012Exit code: 1#012Reason: -#012Stdout: ''#012Stderr: "chpasswd: (user ['user1) pam_chauthtok() failed, error:\nAuthentication token manipulation error\nchpasswd: (line 1, user ['user1) password not changed\n"
Feb 17 15:52:48 si-man [CLOUDINIT] util.py[DEBUG]: Running command ['passwd', '--expire', "['user1"] with allowed return codes [0] (shell=False, capture=True)
Feb 17 15:52:48 si-man [CLOUDINIT] util.py[WARNING]: Failed to set 'expire' for ['user1
Feb 17 15:52:48 si-man [CLOUDINIT] util.py[DEBUG]: Failed to set 'expire' for ['user1#012Traceback (most recent call last):#012  File "/usr/lib/python3/dist-packages/cloudinit/config/cc_set_passwords.py", line 136, in handle#012    util.subp(['passwd', '--expire', u])#012  File "/usr/lib/python3/dist-packages/cloudinit/util.py", line 1836, in subp#012    cmd=args)#012cloudinit.util.ProcessExecutionError: Unexpected error while running command.#012Command: ['passwd', '--expire', "['user1"]#012Exit code: 1#012Reason: -#012Stdout: ''#012Stderr: "passwd: user '['user1' does not exist\n"
Feb 17 15:52:48 si-man [CLOUDINIT] cc_set_passwords.py[DEBUG]: 2 errors occured, re-raising the last one

The issue affects cloud-init installed in xenial-server-cloudimg-amd64-disk1.img
# apt-cache policy cloud-init
cloud-init:
  Installed: 0.7.8-49-g9e904bb-0ubuntu1~16.04.4
  Candidate: 0.7.8-49-g9e904bb-0ubuntu1~16.04.4
  Version table:
 *** 0.7.8-49-g9e904bb-0ubuntu1~16.04.4 500
        500 http://zone-1.clouds.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.7.7~bzr1212-0ubuntu1 500
        500 http://zone-1.clouds.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

cc_set_passwords converts list of user:password lists to str and as
result user names get corrupted.

** Affects: cloud-init
     Importance: Undecided
         Status: New

** Patch added: "0001-Fixes-cc_set_passwords-to-set-passwords-from-list-of.patch"
   https://bugs.launchpad.net/bugs/1665694/+attachment/4820888/+files/0001-Fixes-cc_set_passwords-to-set-passwords-from-list-of.patch

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https://bugs.launchpad.net/bugs/1665694

Title:
  cc_set_passwords fails to change passwords specified as
  chpasswd['list'] in cloud-config

Status in cloud-init:
  New

Bug description:
  If cloud-config contains list of user:password pairs as in example
  below

  chpasswd:
    list:
      - user1:pwd001
      - user2:pwd002

  cc_set_passwords module fails to change passwords with error:
  Feb 17 15:52:48 si-man [CLOUDINIT] stages.py[DEBUG]: Running module set-passwords (<module 'cloudinit.config.cc_set_passwords' from '/usr/lib/python3/dist-packages/cloudinit/config/cc_set_passwords.py'>) with frequency once-per-instance
  Feb 17 15:52:48 si-man [CLOUDINIT] handlers.py[DEBUG]: start: modules-config/config-set-passwords: running config-set-passwords with frequency once-per-instance
  Feb 17 15:52:48 si-man [CLOUDINIT] util.py[DEBUG]: Writing to /var/lib/cloud/instances/6d822e81-98a1-4b43-bed2-db8d0cf045bb/sem/config_set_passwords - wb: [420] 25 bytes
  Feb 17 15:52:48 si-man [CLOUDINIT] helpers.py[DEBUG]: Running config-set-passwords using lock (<FileLock using file '/var/lib/cloud/instances/6d822e81-98a1-4b43-bed2-db8d0cf045bb/sem/config_set_passwords'>)
  Feb 17 15:52:48 si-man [CLOUDINIT] cc_set_passwords.py[DEBUG]: Changing password for ["['user1"]:
  Feb 17 15:52:48 si-man [CLOUDINIT] util.py[DEBUG]: Running command ['chpasswd'] with allowed return codes [0] (shell=False, capture=True)
  Feb 17 15:52:48 si-man [CLOUDINIT] util.py[WARNING]: Failed to set passwords with chpasswd for ["['user1"]
  Feb 17 15:52:48 si-man [CLOUDINIT] util.py[DEBUG]: Failed to set passwords with chpasswd for ["['user1"]#012Traceback (most recent call last):#012  File "/usr/lib/python3/dist-packages/cloudinit/config/cc_set_passwords.py", line 121, in handle#012    util.subp(['chpasswd'], ch_in)#012  File "/usr/lib/python3/dist-packages/cloudinit/util.py", line 1836, in subp#012    cmd=args)#012cloudinit.util.ProcessExecutionError: Unexpected error while running command.#012Command: ['chpasswd']#012Exit code: 1#012Reason: -#012Stdout: ''#012Stderr: "chpasswd: (user ['user1) pam_chauthtok() failed, error:\nAuthentication token manipulation error\nchpasswd: (line 1, user ['user1) password not changed\n"
  Feb 17 15:52:48 si-man [CLOUDINIT] util.py[DEBUG]: Running command ['passwd', '--expire', "['user1"] with allowed return codes [0] (shell=False, capture=True)
  Feb 17 15:52:48 si-man [CLOUDINIT] util.py[WARNING]: Failed to set 'expire' for ['user1
  Feb 17 15:52:48 si-man [CLOUDINIT] util.py[DEBUG]: Failed to set 'expire' for ['user1#012Traceback (most recent call last):#012  File "/usr/lib/python3/dist-packages/cloudinit/config/cc_set_passwords.py", line 136, in handle#012    util.subp(['passwd', '--expire', u])#012  File "/usr/lib/python3/dist-packages/cloudinit/util.py", line 1836, in subp#012    cmd=args)#012cloudinit.util.ProcessExecutionError: Unexpected error while running command.#012Command: ['passwd', '--expire', "['user1"]#012Exit code: 1#012Reason: -#012Stdout: ''#012Stderr: "passwd: user '['user1' does not exist\n"
  Feb 17 15:52:48 si-man [CLOUDINIT] cc_set_passwords.py[DEBUG]: 2 errors occured, re-raising the last one

  The issue affects cloud-init installed in xenial-server-cloudimg-amd64-disk1.img
  # apt-cache policy cloud-init
  cloud-init:
    Installed: 0.7.8-49-g9e904bb-0ubuntu1~16.04.4
    Candidate: 0.7.8-49-g9e904bb-0ubuntu1~16.04.4
    Version table:
   *** 0.7.8-49-g9e904bb-0ubuntu1~16.04.4 500
          500 http://zone-1.clouds.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       0.7.7~bzr1212-0ubuntu1 500
          500 http://zone-1.clouds.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

  cc_set_passwords converts list of user:password lists to str and as
  result user names get corrupted.

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