[Bug 1276796] Re: Long hostname placeholder for PS1 (\H) fails in Bash

[Marc Bihlmaier]

Same problem here with 16.04 LTS, 17.04 and 17.10 , when not specifying
the FQDN in /etc/hostname:

marc at marcubuntu:~$ hostname --fqdn
marcubuntu.tesdomain.intern
marc at marcubuntu:~$ hostname 
marcubuntu
marc at marcubuntu:~$ head -n 2 /etc/hosts
127.0.0.1       localhost
127.0.1.1       marcubuntu.tesdomain.intern marcubuntu
marc at marcubuntu:~$ grep PS1 .bashrc
    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\H\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
    PS1='${debian_chroot:+($debian_chroot)}\u@\H:\w\$ '
    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\H: \w\a\]$PS1"
marc at marcubuntu:~$ bash
marc at marcubuntu:~$ cat /etc/hostname
marcubuntu

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https://bugs.launchpad.net/bugs/1276796

Title:
  Long hostname placeholder for PS1 (\H) fails in Bash

Status in bash package in Ubuntu:
  Confirmed

Bug description:
  When using "\H" in the PS1 prompt value bash is not displaying the
  FQDN but instead only the short form hostname.  This is the same as
  "\h".

  Issue has also been noted at 
  http://serverfault.com/questions/296970/bash-prompt-on-ubuntu-fqdn-h-same-as-hostname-h
  https://answers.launchpad.net/ubuntu/+source/bash/+question/200900

  This appears related to /etc/hostname only having the host and not the
  FQDN.

  Bash should obtain the \H value from somewhere other than /etc/hostname.
  --- 
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  DistroRelease: Ubuntu 13.10
  InstallationDate: Installed on 2014-01-16 (20 days ago)
  InstallationMedia: Ubuntu-Server 13.10 "Saucy Salamander" - Release amd64 (20131016)
  MarkForUpload: True
  Package: bash 4.2-5ubuntu3
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
  Tags:  saucy
  Uname: Linux 3.11.0-15-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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