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# 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
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