/etc/profile.d/bash_completion.sh only sources /usr/share/bash-
completion/bash_completion if it hasn't been already. note the check on
-z "$BASH_COMPLETION_COMPAT_DIR", which the giant bash_completion script
defines with
: ${BASH_COMPLETION_COMPAT_DIR:=/etc/bash_completion.d}
readonly BASH_COMPLETION_COMPAT_DIR
So I guess BASH_COMPLETION_COMPAT_DIR is the canonical way to check if
it's already loaded, since the variable gets marked readonly. (That
prevents even unset from working on it.)
This doesn't help if profile.d goes first, and then bash.bashrc or the
user's ~/.bashrc sources completions without checking, though.
The commented-out lines in the default /etc/bash.bashrc should have the same
check added, if they haven't. My /etc/bash.bashrc.dpkg-old from 2013 still
shows it with the crusty old:
# enable bash completion in interactive shells
#if [ -f /etc/bash_completion ] && ! shopt -oq posix; then
# . /etc/bash_completion
#fi
/etc/profile.d is a silly place to have this, though. How and whether
programmable completion is enabled by default is a topic for another
bug, but I don't think there's any way to justify having it for login
shells but not for non-login shells. xterm, gnome-terminal, etc. all
normally start non-login shells.
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https://bugs.launchpad.net/bugs/790043
Title:
Bash-completion slows up the start of bash
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