[Bug 790043] Re: Bash-completion slows up the start of bash

[Peter Cordes]

So to be clear, the changes I'm suggesting are:

* /etc/skel/.bashrc (pkg=base-files) change the progcomp check to an un-commented
# enable programmable completion
[[ -e /etc/profile.d/bash_completion.sh ]] && . /etc/profile.d/bash_completion.sh

* /etc/bash.bashrc (pkg=bash): remove the progcomp commented-out section, maybe replace with a comment like:
# enable programmable completion with this line, here or (default) in ~/.bashrc
# [[ -e /etc/profile.d/bash_completion.sh ]] && . /etc/profile.d/bash_completion.sh

Root's /root/.bashrc doesn't come into play on an ubuntu system,
normally.  Even if you use sudo -s, HOME doesn't change, so you still
get your own ~/.bashrc

If you're mucking around with testing corner cases, put
echo "bash_completion callstack: ${BASH_SOURCE[*]}"
 in /usr/share/bash-completion/bash_completion to get output like
bash_completion callstack: /usr/share/bash-completion/bash_completion /etc/profile.d/bash_completion.sh /home/peter/.bashrc

 Or drop that line into /etc/bash_completion.d/trace, if you don't want
to modify a non-conffile.

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https://bugs.launchpad.net/bugs/790043

Title:
  Bash-completion slows up the start of bash

Status in bash-completion package in Ubuntu:
  Triaged

Bug description:
  Binary package hint: bash-completion

  I have been noticing that bash has unusually slow start-up times.
  After looking into the problem, I found out this is mostly caused by
  the execution of /etc/bash_completion (calls to this exist in several
  places). Of course, removing them speeds up the start but leaves a
  less functional shell. As a work-around I would like to suggest
  starting up /etc/bash_completion in the background. In this way, bash
  will start quickly, have access only to basic built-in completions for
  the first 2 seconds until /etc/bash_completion finishes executing.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: bash-completion 1:1.3-1ubuntu3
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  Architecture: amd64
  Date: Sun May 29 22:43:51 2011
  EcryptfsInUse: Yes
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US.UTF-8:en
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: bash-completion
  UpgradeStatus: Upgraded to natty on 2011-04-24 (35 days ago)

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