This file is indexed.

/usr/share/autopkgtest/ssh-setup/SKELETON is in autopkgtest 5.3.1.

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The actual contents of the file can be viewed below.

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#!/bin/sh
# Skeleton for an autopkgtest-virt-ssh setup script that configures a testbed.
# See man autopkgtest-virt-ssh for details.

set -e

# add testbed capabilities here (possibly dynamically), see
# doc/README.virtualisation-server.rst
CAPABILITIES='isolation-machine'

SUDO_PASSWORD=''

# create a testbed (if necessary), configure ssh, copy ssh key into it,
# configure sudo, etc.; print a list of "key=value" parameters to stdout on
# success
# required: login, hostname
# optional: identity, password, port, options, capabilities, extraopts
# see autopkgtest-virt-ssh(1) for details
open() {
    cat<<EOF
login=<username>
hostname=<host>
capabilities=$CAPABILITIES
identity=$HOME/.ssh/id_rsa
extraopts="<additional args to pass to the script with other commands>"
EOF
    if [ -n "$SUDO_PASSWORD" ]; then
        echo "password=$SUDO_PASSWORD"
    fi
}

# called when closing the testbed; should revert/remove things installed in
# open() if the testbed is not ephemeral
cleanup() {
    exit 0
}

# Called for reverting the testbed. This can optionally output some or all of
# the ssh config keys from open() to update the configuration.
# This only needs to be implemented if CAPABILITIES offers "revert".
revert() {
    echo "revert not implemented" >&2
    exit 1

    # calling these two is a common method, but there might be a more efficient
    # way like snapshots
    # cleanup
    # open
}

# Called after "reboot". You only need to implement this if CAPABILITIES offers
# "reboot" and you need to do something more elaborate than just waiting for
# ssh to go down and come back.
wait_reboot() {
    # wait for testbed to shut down, come back up, and re-prepare for ssh login
    exit 1  # not implemented
}

# Called when the setup script fails with nonzero or on timeouts waiting for
# ssh or reboot. If available, this should output some debugging information,
# such as the boot log from the serial console. Implementing this is optional.
debug_failure() {
    exit 1  # not implemented
}

case "$1" in
    open)
        open $@;;
    cleanup)
        cleanup $@;;
    revert)
        revert $@;;
    wait-reboot)
        wait_reboot $@;;
    debug-failure)
        debug_failure $@;;
    '')
        echo "Needs to be called with command as first argument" >&2
        exit 1
        ;;
    *)
        echo "invalid command $1" >&2
        exit 1
        ;;
esac