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[Ryota Mibu <1237802@xxxxxxxxxxxxxxxxxx>]

** Changed in: ironic
       Status: New => Opinion

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https://bugs.launchpad.net/bugs/1237802

Title:
  IPMI power manager hangs when the password is empty.

Status in Ironic (Bare Metal Provisioning):
  Opinion
Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  While creating Baremetal Node by `nova baremetal-node-create' with
  --pm_password '' [1] and starting a deployment, IPMI power manager
  hangs with showing prompt "Password:" in nova-compute process. IPMI
  power manager creates an empty file and specifies it as the password
  file in the ipmitool command line, but ipmitool ignores that file [2].

  This is an uncommon case that an administrator set password empty, but
  this is not a low importance bug due to it stops the thread.

  I think we can avoid this bug by writing '\0' into the password file
  [3], since ipmitool checks return value of fgets() is not NULL which
  means the file is not start with EOF and no error had occurred.

  [1] e.g.:
      $ nova baremetal-node-create --pm_address 192.0.2.200 --pm_user admin --pm_password '' service-host 1 1000 10000 00:11:22:33:44:55

  [2] In ipmitool manpage:
      -f <password_file>
          Specifies a file containing the remote server password. If this option is absent, or if password_file is empty, the password will default to NULL.

  [3] I checked that ipmitool works with a file containing '\0';
      # touch a
      # ipmitool -I lanplus -H 192.0.2.94 -f a -U administrator power status
      Unable to read password from file a
      Unable to read password from file a
      Password:                       <-- Enter
      Chassis Power is off
      # echo -ne '\0' > b
      # ipmitool -I lanplus -H 192.0.2.94 -f b -U administrator power status
      Chassis Power is off

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