qvm/qvm

#!/usr/bin/env sh

# qvm - Trivial management of 64 bit virtual machines with qemu.
#
# Written in 2016 by Franco Masotti/frnmst <franco.masotti@student.unife.it>
#
# To the extent possible under law, the author(s) have dedicated all 
# copyright and related and neighboring rights to this software to the public 
# domain worldwide. This software is distributed without any warranty.
#
# You should have received a copy of the CC0 Public Domain Dedication along 
# with this software. If not, see 
# <http://creativecommons.org/publicdomain/zero/1.0/>. 

help()
{
    cat <<-EOF
Usage: qvm [OPTION]
Trivial management of 64 bit virtual machines with qemu.

Options:
    -a, --attach                connect via SSH
    -b, --backup                backup vhd
    -c, --create                create new vhd
    -d, --delete                delete vhd backup
        --delete-orig           delete original vhd
    -h, --help                  print this help
    -i, --install               install img on vhd
    -n, --run-nox               run vm without opening a graphical window
                                (useful for background jobs like SSH)
        --run-nox-orig          run-orig and run-nox combined
    -s, --mkdir-shared          create shared directory
    -x, --run                   run vm
        --run-orig              run from original vhd


Only a single option is accepted.
By default, the backup vhd is run.

CC0
Written in 2016 by Franco Masotti/frnmst <franco.masotti@student.unife.it>
EOF
}

unrecognized_option()
{
    printf "%s\n" "Try 'qvm --help' for more information"
} 1>&2-

attach()
{
    ssh -p "$ssh_host_port" -l "$ssh_guest_username" 127.0.0.1
}

backup()
{
    qemu-img create -f "$vhd_type" \
-b "$vhd_name" \
"$vhd_name".mod
}

create()
{
    qemu-img create -f "$vhd_type" \
"$vhd_name" \
"$vhd_size"
}

delete()
{
    local argc="$1"
    local vhd=""

    if [ "$argc" = "orig" ]; then
        vhd="$vhd_name"
    else
        vhd=""$vhd_name".mod"
    fi

    rm "$vhd"
}

installs()
{
    qemu-system-x86_64 -m "$vm_memory" \
-enable-kvm \
-cdrom "$img_name" \
-boot order=d \
"$vhd_name" &
}

shared()
{
    mkdir -p "$shared_data_path"
}

run()
{
    local argc1="$1"
    local argc2="$2"
    local vhd=""
    local display=""

    if [ "$argc2" = "orig" ]; then
        vhd="$vhd_name"
    else
        vhd=""$vhd_name".mod"
    fi

    if [ "$argc1" = "none" ]; then
        display="none"
    else
        display="gtk"
    fi

    export QEMU_AUDIO_DRV=alsa

    if [ -f "$vhd" ]; then
        qemu-system-x86_64 \
-m "$vm_memory" \
-enable-kvm \
-device e1000,netdev=user.0 \
-netdev user,\
id=user.0,hostfwd=tcp::"$host_port"-:"$guest_port",\
hostfwd=tcp::"$ssh_host_port"-:"$ssh_guest_port" \
-virtfs local,path="$shared_data_path",\
security_model=none,mount_tag="$mount_tag" \
-soundhw ac97 \
-display "$display" \
"$vhd" &
    else
        printf "VHD file \""$vhd"\" is missing.\n"
        exit 1
    fi
}

main()
{
    local argc="$1"
    local options="abcdhinrx"
    local long_options="attach,backup,create,delete,delete-orig\
,help,install,run,run-orig,run-nox,run-nox-orig"
    local opts
    local opt

    [ -z "$argc" ] && argc="-x"

    opts="$(getopt --options $options --longoptions $long_options -- $argc)"

    [ $? -ne 0 ] && unrecognized_option && return 1

    eval set -- "$opts"

    # Source variables globally.
    . ./configvmrc

    for opt in $opts; do
        case "$opt" in
            -- )                                        ;;
            -a | --attach )             attach          ;;
            -b | --backup )             backup          ;;
            -c | --create )             create          ;;
            -d | --delete )             delete          ;;
                 --delete-orig )        delete orig     ;;
            -h | --help )               help            ;;
            -i | --install )            installs        ;;
            -n | --run-nox )            run none        ;;
                 --run-nox-orig )       run none orig   ;;
            -s | --mkdir-shared )       shared          ;;
            -x | --run )                run gtk         ;;
                 --run-orig )           run gtk orig    ;;
        esac
    done
}

main "$*"