This file is indexed.

/etc/bash_completion.d/devscripts.pkgnames is in devscripts 2.15.3+deb8u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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_pkg_names()
{
    local cur prev opts
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"

    COMPREPLY=( $( apt-cache pkgnames $cur 2> /dev/null ) )

    return 0
}

_debc()
{
    local cur
    cur="${COMP_WORDS[COMP_CWORD]}"
    COMPREPLY=($(compgen -f -X '!*.changes' -- "$cur"))
    if echo "$cur" | grep -qs '^[a-z0-9+.-]*$'; then
        COMPREPLY=(${COMPREPLY[@]} $(apt-cache pkgnames -- $cur 2> /dev/null))
    fi
    return 0
}
complete -F _pkg_names wnpp-alert wnpp-check mk-build-deps rmadison mass-bug debsnap dd-list build-rdeps who-uploads transition-check getbuildlog dcontrol grep-excuses rc-alert bts whodepends dget pts-subscribe debc pts-unsubscribe
complete -o dirnames -F _debc debc