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|
#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
vm ACTION [OS]
vm -h
EOF
}
help() {
cat <<-'EOF'
Options:
-h, --help show this message
ACTION one of:
- up
- down
- status
OS the name of the OS to be acted upon
Manage the state of known virtual machines.
The VM QCOW2 images are stored under
$XDG_STATE_HOME/euandreh/qemu/, as "$OS.qcow2" files. The PIDs
of the running images are stored in individual files under
$XDG_RUNTIME_DIR/vm-pids/, as "$OS.pid" files.
It also generates an SSH configuration file to bu `Included`
by the main $XDG_CONFIG_HOME/ssh/config file, which contains
one alias entry for each VM, so that one can do a combination
of `vm up alpine && ssh alpine`.
Examples:
Start the VM for Alpine:
$ vm up alpine
Stop the VM for Slackware, which was already down
$ vm down slackware
The VM for "slackware" is not running, already.
List the available VMs, and their current state:
$ vm status
alpine:up
slackware:down
freebsd:up
EOF
}
for flag in "$@"; do
case "$flag" in
--)
break
;;
--help)
usage
help
exit
;;
*)
;;
esac
done
while getopts 'h' flag; do
case "$flag" in
h)
usage
help
exit
;;
*)
usage >&2
exit 2
;;
esac
done
shift $((OPTIND - 1))
ACTION="${1:-}"
OS="${2:-}"
eval "$(assert-arg "$ACTION" 'ACTION')"
VMS='
alpine:60022
'
for vm in $VMS; do
NAME="$(echo "$vm" | cut -d: -f1)"
PORT="$(echo "$vm" | cut -d: -f2)"
cat <<-EOF
Host $NAME
HostName localhost
Port $PORT
EOF
done > "$XDG_DATA_HOME"/euandreh/vm-ssh.conf
PIDS_DIR="${XDG_RUNTIME_DIR:-${TMPDIR:-/tmp}}/vm-pids"
PID_F="$PIDS_DIR/$OS.pid"
mkdir -p "$PIDS_DIR"
port_for_os() {
_OS="$1"
_PORT="$(echo "$VMS" | awk -F: -vOS="$_OS" '$1 == OS { print $2 }')"
if [ -z "$_PORT" ]; then
printf 'Unknown OS: "%s".\n\n' "$_OS" >&2
usage >&2
exit 2
fi
printf '%s' "$_PORT"
}
case "$ACTION" in
status)
echo "$VMS" | awk -F: '$0=$1' | while read -r vm; do
if [ -e "$PIDS_DIR/$vm.pid" ]; then
STATUS=up
else
STATUS=down
fi
printf '%s:%s\n' "$vm" "$STATUS"
done
;;
up)
eval "$(assert-arg "$OS" 'OS')"
PORT="$(port_for_os "$OS")"
if [ -e "$PID_F" ]; then
printf 'The VM for "%s" is already running with PID %s.\n' \
"$OS" "$(cat "$PID_F")" >&2
else
QCOW="$XDG_STATE_HOME"/euandreh/qemu/"$OS".qcow2
qemu-system-x86_64 \
-m 1G \
-nic user,model=virtio,hostfwd=tcp::"$PORT"-:22 \
-drive file="$QCOW",media=disk,if=virtio \
-enable-kvm \
-nographic 1>/dev/null 2>&1 &
printf '%s' $! > "$PID_F.pid"
fi
;;
down)
eval "$(assert-arg "$OS" 'OS')"
PORT="$(port_for_os "$OS")"
if [ ! -e "$PID_F" ]; then
printf 'The VM for "%s" is not running, already.\n' "$OS" >&2
else
# shellcheck disable=2064
trap "rm -f $PID_F" EXIT
kill "$(cat "$PID_F")"
fi
;;
*)
printf 'Unrecognized action: "%s".\n\n' "$ACTION" >&2
usage >&2
exit 2
esac
|
