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|
#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
vm [-G] [-S] [-v] ACTION [OS]
vm -h
EOF
}
help() {
cat <<-'EOF'
Options:
-G use graphics
-S don't write to VM image (snapshot on)
-v verbose mode
-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
$XDG_STATE_HOME/vm/qemu/, as "$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 under
$XDG_DATA_HOME/vm/ssh.conf to be `Included` by the main
~/.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
GRAPHICS=false
SNAPSHOT=false
VERBOSE=false
while getopts 'GSvh' flag; do
case "$flag" in
G)
GRAPHICS=true
;;
S)
SNAPSHOT=true
;;
v)
VERBOSE=true
;;
h)
usage
help
exit
;;
*)
usage >&2
exit 2
;;
esac
done
shift $((OPTIND - 1))
QCOW_DIR="${XDG_STATE_HOME:-$HOME/.local/state}"/vm/qemu
RUNDIR="${XDG_RUNTIME_DIR:-${TMPDIR:-/tmp}}/vm"
LOGS="$RUNDIR"/logs
mkdir -p "$RUNDIR" "$QCOW_DIR" "$XDG_DATA_HOME"/vm
guess_name() {
PREFIX="$1"
IMAGES="$(find "$QCOW_DIR" -type f -name "${PREFIX}*")"
COUNT="$(echo "$IMAGES" | wc -l)"
if [ "$COUNT" != 1 ]; then
printf 'Cannot guess name with the given prefix: "%s".\n' "$PREFIX" >&2
printf '\nThe possibilities are:\n' >&2
printf '%s\n' "$IMAGES" |
xargs -I% basename % .qcow2 |
sed 's/^/- /' >&2
exit 2
fi
printf '%s\n' "$(basename "$IMAGES" .qcow2)"
}
write_ssh_config() {
for port in "$RUNDIR"/*.port; do
if [ ! -e "$port" ]; then
break
fi
NAME="$(basename "$port" .port)"
PORT="$(cat "$port")"
cat <<-EOF
Host $NAME
HostName localhost
Port $PORT
EOF
done > "$XDG_DATA_HOME"/vm/ssh.conf
}
write_ssh_config
ACTION="${1:-}"
OS="${2:-}"
eval "$(assert-arg "$ACTION" 'ACTION')"
FLAGS=''
if [ "$GRAPHICS" = false ]; then
FLAGS="$FLAGS -nographic"
else
FLAGS="$FLAGS -display sdl"
fi
if [ "$SNAPSHOT" = true ]; then
FLAGS="$FLAGS -snapshot"
fi
case "$ACTION" in
status)
for img in "$QCOW_DIR"/*.qcow2; do
if [ ! -e "$img" ]; then
break
fi
NAME="$(basename "$img" .qcow2)"
if [ -e "$RUNDIR/$NAME.pid" ]; then
STATUS=up
else
STATUS=down
fi
printf '%s\t%s\n' "$NAME" "$STATUS"
done
;;
up)
eval "$(assert-arg "$OS" 'OS')"
OS="$(guess_name "$OS")"
PID_F="$RUNDIR/$OS.pid"
PORT_F="$RUNDIR/$OS.port"
if [ -e "$PID_F" ]; then
printf 'The VM for "%s" is already running with PID %s.\n' \
"$OS" "$(cat "$PID_F")" >&2
exit 1
fi
PORT="$(free-port)"
QCOW="$QCOW_DIR"/"$OS".qcow2
if [ "$VERBOSE" = true ]; then
set -x
fi
# shellcheck disable=2086
qemu-system-x86_64 \
-m 1G \
-nic user,model=virtio,hostfwd=tcp::"$PORT"-:22 \
-drive file="$QCOW",media=disk,if=virtio \
-enable-kvm \
$FLAGS 1>>"$LOGS" 2>&1 &
PID=$!
set +x
printf '%s' "$PID" > "$PID_F"
printf '%s' "$PORT" > "$PORT_F"
write_ssh_config
;;
down)
eval "$(assert-arg "$OS" 'OS')"
OS="$(guess_name "$OS")"
PID_F="$RUNDIR/$OS.pid"
PORT_F="$RUNDIR/$OS.port"
if [ ! -e "$PID_F" ]; then
printf 'The VM for "%s" is not running, already.\n' "$OS" >&2
exit 1
fi
PID="$(cat "$PID_F")"
rm -f "$PID_F" "$PORT_F"
kill "$PID"
write_ssh_config
;;
*)
printf 'Unrecognized action: "%s".\n\n' "$ACTION" >&2
usage >&2
exit 2
esac
|
