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

[Peter Cordes]

The shell builtin command return can be used to exit early from a file
sourced with . or source.

bash_completion could protect itself from being re-sourced by doing
type __reassemble_comp_words_by_ref 2>/dev/null && return
Or maybe
complete -p paste 2>/dev/null && return
So complete -r; source /usr/share/bash-completion/bash_completion would re-load.

 This still violates the expectation that users might have that if they
changed stuff in /etc/bash_completion.d, they could just re-source the
system bash_completion script.

 Maybe
complete -p paste 2>/dev/null && 
  echo "completions already loaded, complete -r before sourcing if you want them re-loaded" >&2 && 
  return

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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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