dotfiles/bin/qemush

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#!/bin/bash
exec_as() {
local user="$1"
shift
if [ "$(whoami)" != "$user" ]; then
exec sudo -u "$user" "$0" "$@"
else
cd
fi
}
exec_as qemu "$@" || exit
PATH="./bin:${PATH}"
perror() {
>&2 printf '\033[1;31mERROR:\033[0m \033[1m%s\033[0m\n' "$*"
}
public_help() {
local name
name="$(basename "$0")"
cat << EOF
${name}: usage:
${name} start <VM name> - start a VM
${name} watch <VM name> - attach VM screen session
${name} active - (default behaviour) list active VMs
${name} list - list available VMs
${name} help - show this help
${name} diskls - list available disk images
${name} diskadd <disk name> <size> - create a disk image
${name} diskrm <disk name> - delete disk image
${name} add <VM name> <template> - add launch script based on template
${name} rm <VM name> - delete launch script
EOF
}
error_usage() {
perror "Invalid usage"
>&2 public_help
return 1
}
public_start() {
local vm_name="$1"
shift
screen -d -m -S "$vm_name" "$vm_name" "$@"
}
public_watch() {
screen -dr "$1"
}
public_active() {
screen -ls
}
public_list() {
echo "Available machines:"
ls --color=auto bin
}
diskpath() {
printf 'images/%s.qcow2' "$1"
}
public_diskadd() {
qemu-img create -f qcow2 "$(diskpath "$1")" "$2"
}
public_diskrm() {
rm -vi -- "$(diskpath "$1")"
}
public_diskls() {
echo "Available disks:"
ls --color=auto images
}
public_add() {
ln -vs "$2" "bin/${1}"
}
public_rm() {
unlink "bin/${1}"
}
function="$1"
shift
if declare -F | cut -d \ -f 3- | grep '^public_' | sed 's/^public_//' | grep -q "^${function}$"; then
"public_${function}" "$@"
else
error_usage
fi