FM / snapd

/snap/snapd/27710/usr/lib/snapd

Name	Size	Mode	Actions
apparmor/	-	0755	rm
apparmor.d/	-	0755	rm
apparmor_parser	1700832	0755	edit dl rm
complete.sh	5394	0644	edit dl rm
etelpmoc.sh	7031	0644	edit dl rm
info	118	0644	edit dl rm
preseed.json	841	0644	edit dl rm
snap-bootstrap	13865297	0755	edit dl rm
snap-confine	218241	0755	edit dl rm
snap-confine.caps	143	0644	edit dl rm
snap-confine.v2-only.caps	121	0644	edit dl rm
snap-debug-info.sh	2372	0755	edit dl rm
snap-device-helper	67545	0755	edit dl rm
snap-discard-ns	51113	0755	edit dl rm
snap-exec	5616696	0755	edit dl rm
snap-failure	3219529	0755	edit dl rm
snap-fde-keymgr	5328969	0755	edit dl rm
snap-gdbserver-shim	1079280	0755	edit dl rm
snap-gpio-helper	3080265	0755	edit dl rm
snap-mgmt	22207	0755	edit dl rm
snap-mgmt-selinux	3269	0755	edit dl rm
snap-preseed	11771977	0755	edit dl rm
snap-recovery-chooser	9486409	0755	edit dl rm
snap-repair	8765513	0755	edit dl rm
snap-seccomp	3010897	0755	edit dl rm
snap-strace-shim	34273	0755	edit dl rm
snap-update-ns	6718584	0755	edit dl rm
snapctl	8455848	0755	edit dl rm
snapd	31965257	0755	edit dl rm
snapd-apparmor	2695241	0755	edit dl rm
snapd.core-fixup.sh	3826	0755	edit dl rm
snapd.run-from-snap	73	0755	edit dl rm
system-shutdown	38585	0755	edit dl rm

Edit: /snap/snapd/27710/usr/lib/snapd/complete.sh (5394B)

# shellcheck shell=bash
#
#  Copyright (C) 2017 Canonical Ltd
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License version 3 as
#  published by the Free Software Foundation.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.

# _complete_from_snap performs the tab completion request by calling the
# appropriate 'snap run --command=complete' with serialized args, and
# deserializes the response into the usual tab completion result.
#
# How snap command completion works is:
# 1. snapd's complete.sh is sourced into the user's shell environment
# 2. user performs '<command> <tab>'. If '<command>' is a snap command,
#    proceed to step '3', otherwise perform normal bash completion
# 3. run 'snap run --command=complete ...', converting bash completion
#    environment into serialized command line arguments
# 4. 'snap run --command=complete ...' exec()s 'etelpmoc.sh' within the snap's
#    runtime environment and confinement
# 5. 'etelpmoc.sh' takes the serialized command line arguments from step '3'
#    and puts them back into the bash completion environment variables
# 6. 'etelpmoc.sh' sources the snap's 'completer' script, performs the bash
#    completion and serializes the resulting completion environment variables
#    by printing to stdout the results in a format that snapd's complete.sh
#    will understand, then exits
# 7. control returns to snapd's 'complete.sh' and it deserializes the output
#    from 'etelpmoc.sh', validates the results and puts the validated results
#    into the bash completion environment variables
# 8. bash displays the results to the user
type -t _complete_from_snap > /dev/null ||
_complete_from_snap() {
    {
        # De-serialize the output of 'snap run --command=complete ...' into the format
        # bash expects:
        read -r -a opts
        # opts is expected to be a series of compopt options
        if [[ ${#opts[@]} -gt 0 ]]; then
            if [[ "${opts[0]}" == "cannot" ]]; then
                # older snap-execs sent errors over stdout :-(
                return 1
            fi

for i in "${opts[@]}"; do
                if ! [[ "$i" =~ ^[a-z]+$ ]]; then
                    # only lowercase alpha characters allowed
                    return 2
                fi
            done
        fi

read -r bounced
        case "$bounced" in
            ""|"alias"|"export"|"job"|"variable")
                # OK
                ;;
            *)
                # unrecognised bounce
                return 2
                ;;
        esac

read -r sep
        if [ -n "$sep" ]; then
            # non-blank separator? madness!
            return 2
        fi
        local oldIFS="$IFS"

if [ ! "$bounced" ]; then
            local IFS=$'\n'
            # Ignore any suspicious results that are uncommon in filenames and that
            # might be used to trick the user. A whitelist approach would be better
            # but is impractical with UTF-8 and common characters like quotes.
            COMPREPLY=( $( command grep -v '[[:cntrl:];&?*{}]' ) )
            IFS="$oldIFS"
        fi

if [[ ${#opts[@]} -gt 0 ]]; then
            # shellcheck disable=SC2046
            # (we *want* word splitting to happen here)
            compopt $(printf " -o %s" "${opts[@]}")
        fi
        if [ "$bounced" ]; then
            # We validated '$bounced' above and '${COMP_WORDS[$COMP_CWORD]}' is
            # coming from the user's session, not the snap so skip input
            # validation: we aren't trying to protect the user from themselves.
            COMPREPLY+=(compgen -A "$bounced" -- "${COMP_WORDS[$COMP_CWORD]}")
        fi
    } < <(
        snap run --command=complete "$1" "$COMP_TYPE" "$COMP_KEY" "$COMP_POINT" "$COMP_CWORD" "$COMP_WORDBREAKS" "$COMP_LINE" "${COMP_WORDS[@]}" 2>/dev/null || return 1
    )

}

# this file can be sourced directly as e.g. /usr/lib/snapd/complete.sh, or via
# a symlink from /var/lib/snapd/desktop/bash-completion/completions/. In the first case we
# want to load the default loader; in the second, the specific one.
#
if [[ "${BASH_SOURCE[0]}" =~ ^(/var/lib/snapd/desktop|/usr/share)/bash-completion/completions/ ]]; then
    complete -F _complete_from_snap "$1"
else

# _complete_from_snap_maybe calls _complete_from_snap if the command is in
    # bin/snap, and otherwise does bash-completion's _completion_loader (which is
    # what -D would've done before).
    type -t _complete_from_snap_maybe > /dev/null ||
    _complete_from_snap_maybe() {
        local etel=snap/core/current/usr/lib/snapd/etelpmoc.sh
        # catch /snap/bin and /var/lib/snapd/snap/bin
        if [[ "$(command -v "$1")" =~ ^(/var/lib/snapd)?/snap/bin/ && ( -e "/var/lib/snapd/$etel" || -e "/$etel" )  ]]; then
            complete -F _complete_from_snap "$1"
            return 124
        fi
        # fallback to the old -D
        _completion_loader "$1"
    }

complete -D -F _complete_from_snap_maybe
fi

cmd: