pet

#!/bin/bash
set -euo pipefail

PET_IMAGE=registry.fedoraproject.org/fedora:27

main() {
    local name=pet
    if [ $# -ne 0 ]; then
        name=$1; shift
    fi

    if [[ $name == -h ]] || [[ $name == --help ]]; then
        echo "Enter a pet container, creating it first if it doesn't exist."
        echo "Usage: $0 [pet-name]"
        return 0
    fi

    if ! pet_exists $name; then
        pet_create $name
    else
        pet_resume $name
    fi

    pet_exec $name
}

pet_exists() {
    local name=$1; shift
    sudo podman inspect $name &>/dev/null
}

pet_create() {
    local name=$1; shift

    # pass DISPLAY so we can copy to clipboard in vimx
    # pass TERM otherwise it defaults to xterm
    # use --net=host to keep topology simple but point to the libvirtd
    # dnsmasq so we don't need to worry about on/off VPN resolv.conf
    # updating
    echo -n "Creating $name: "
    sudo podman run --name $name -e DISPLAY -e TERM -t --privileged \
       -v /srv:/srv -v /var/cache/dnf:/var/cache/dnf -v $HOME:$HOME \
       -v /etc/localtime:/etc/localtime --detach-keys='ctrl-q,ctrl-p' \
       --detach --dns=192.168.122.1 --net=host --hostname=$name \
       $PET_IMAGE /bin/bash

    # do the strict minimum here
    sudo podman exec $name sh -c "
        dnf install -y sudo
        echo '%wheel ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers
        useradd --groups wheel --uid 1000 jlebon
    "
}

pet_resume() {
    local name=$1; shift
    local state=$(get_pet_state $name)
    if [[ $state == configured ]] || [[ $state == exited ]]; then
        echo -n "Resuming $name: "
        sudo podman start $name
    elif [[ $state != running ]]; then
        echo "Container '$name' in unknown state: $state"
        return 1
    fi
}

get_pet_state() {
    local name=$1; shift
    sudo podman inspect $name --format '{{.State.Status}}'
}

pet_exec() {
    local name=$1; shift
    sudo podman exec -t -e TERM=$TERM -e DISPLAY=$DISPLAY $name sudo -i -u jlebon
}

main "$@"