[Bug 1692420] Comment bridged from LTC Bugzilla

[bugproxy]

------- Comment From pavrampu at in.ibm.com 2017-12-20 04:18 EDT-------
Installed powerpc-utils from - proposed. Issue is still observed.

~# sudo apt-get install powerpc-utils
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
powerpc-utils
1 upgraded, 0 newly installed, 0 to remove and 27 not upgraded.
Need to get 1,706 B of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://us.ports.ubuntu.com/ubuntu-ports zesty-proposed/main ppc64el powerpc-utils ppc64el 1.3.2-1ubuntu3~17.04 [1,706 B]
Fetched 1,706 B in 0s (8,144 B/s)
(Reading database ... 51522 files and directories currently installed.)
Preparing to unpack .../powerpc-utils_1.3.2-1ubuntu3~17.04_ppc64el.deb ...
Unpacking powerpc-utils (1.3.2-1ubuntu3~17.04) over (1.3.2-1ubuntu2~17.04) ...
Setting up powerpc-utils (1.3.2-1ubuntu3~17.04) ...
:~# lsdevinfo
/usr/sbin/lsdevinfo: line 233: warning: command substitution: ignored null byte in input
device:
name="ibmveth2"
uniquetype="adapter/vdevice/IBM,l-lan"
class="adapter"
subclass="vdevice"
type="IBM,l-lan"
prefix="eth"
driver="ibmveth"
status="1"

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https://bugs.launchpad.net/bugs/1692420

Title:
  [SRU] powerpc-utils commands exhibits "command substitution: ignored
  null byte in input" warning message

Status in The Ubuntu-power-systems project:
  Fix Committed
Status in powerpc-utils package in Ubuntu:
  Fix Released
Status in powerpc-utils source package in Zesty:
  Fix Committed

Bug description:
  [Impact]

  The current version of powerpc-utils in Ubuntu Zesty and Artful
  carries a bug exposed by bash 4.4+ which causes a warning to be logged
  to stderr in 4 different commands: ls-veth, ls-vscsi, lsdevinfo, and
  ofpathname. Bash is unable to store the NUL bytes in the result of a
  command substitution, prior to 4.4 it silently dropped the NUL bytes,
  but since 4.4 it drops the NUL bytes with a warning: "command
  substitution: ignored null byte in input".

  Additionally to that the ofpathname command also had a bug that caused
  a "cd: too many arguments" warning.

  Upstream has fixed both [1] and they now need to be backport to Zesty.

  [Test Case 1]

  Call any of the affected commands without arguments, they should
  output "command substitution: ignored null byte in input" to stderr.

  The same warning can easily be reproduced in bash 4.4+ by executing:
  $ x=$(cat < /proc/$$/cmdline)
  bash: warning: command substitution: ignored null byte in input

  And to fix it:
  $ x=$(tr -d '\0' < /proc/$$/cmdline)
  <no output, as expected>

  [Test Case 2]
  Call ofpathname with no arguments:
  $ ofpathname
  cd: too many arguments

  [Regression Potential]

  The replacement of 'cat' with 'tr -d "\0"' causes no regression. Also,
  both commands are part of coreutils.

  The 'cd' fix replaces it with a drop_dir call. In case the requested
  path is not found then the previous behavior would be kept (ie. no
  directory change).

  [Other Info]

  Upstream fix link:
  [1] https://github.com/ibm-power-utilities/powerpc-utils/commit/4fcc611a09caea70e6bca6a1275211c72ac4bb45

  [Old description]
  Please cherry pick...

  https://github.com/ibm-power-utilities/powerpc-
  utils/commit/4fcc611a09caea70e6bca6a1275211c72ac4bb45

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