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authorKaren Arutyunov <karen@codesynthesis.com>2020-09-03 11:44:20 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2020-09-03 11:47:33 +0200
commitf42eb41a5164780ac8bf5934d0fa6278a6ace6f0 (patch)
tree5dceec3319616297a8100961f83545096716627d /etc/private/vm-start-base
parent35c888632c7cfa8a2c2c3995c79277dd43a179af (diff)
Initial support for private brep instance setup
Diffstat (limited to 'etc/private/vm-start-base')
-rwxr-xr-xetc/private/vm-start-base187
1 files changed, 187 insertions, 0 deletions
diff --git a/etc/private/vm-start-base b/etc/private/vm-start-base
new file mode 100755
index 0000000..df59d6a
--- /dev/null
+++ b/etc/private/vm-start-base
@@ -0,0 +1,187 @@
+#! /usr/bin/env bash
+
+# Start a QEMU/KVM virtual machine.
+#
+# --cpu <num>
+# CPU hardware threads to allocate to the VM, 1 by default.
+#
+# --ram <num>
+# RAM to allocate to the VM, 2G by default (can be specified with G,
+# M suffixes).
+#
+# --tap <tap>
+# Existing tap interface to use instead of creating a new one.
+#
+# --mac <addr>
+# MAC address to use for the machine.
+#
+# --monitor <path>
+# Monitor UNIX socket path, /tmp/machine-<tap>-mon.sock if unspecified.
+#
+# --console <path>
+# Console UNIX socket path, /tmp/machine-<tap>-con.sock if unspecified.
+#
+# --stdio
+# Connect both console and monitor to stdio (multiplexed).
+#
+# --stdio-monior
+# Connect only monitor to stdio.
+#
+usage="usage: $0 [<options>] <machine-img> [<extra-qemu-options>]"
+
+owd="$(pwd)"
+trap "{ cd '$owd'; exit 1; }" ERR
+set -o errtrace # Trap in functions.
+
+function info () { echo "$*" 1>&2; }
+function error () { info "$*"; exit 1; }
+
+qemu=(qemu-system-x86_64 -enable-kvm)
+
+# The bridge is only used if we are cretaing the tap.
+#
+br=br0
+
+cpu=1
+ram=2G
+tap=
+mac="de:ad:be:ef:b8:da"
+mon=
+con=
+stdio=
+stdio_monitor=
+
+while [ "$#" -gt 0 ]; do
+ case "$1" in
+ --cpu)
+ shift
+ cpu="$1"
+ shift
+ ;;
+ --ram)
+ shift
+ ram="$1"
+ shift
+ ;;
+ --tap)
+ shift
+ tap="$1"
+ shift
+ ;;
+ --mac)
+ shift
+ mac="$1"
+ shift
+ ;;
+ --monitor)
+ shift
+ mon="$1"
+ shift
+ ;;
+ --console)
+ shift
+ con="$1"
+ shift
+ ;;
+ --stdio)
+ stdio=true
+ stdio_monitor=
+ shift
+ ;;
+ --stdio-monitor)
+ stdio=
+ stdio_monitor=true
+ shift
+ ;;
+ *)
+ break
+ ;;
+ esac
+done
+
+img="$1"
+shift
+
+if [ -z "$img" ]; then
+ error "missing machine image"
+fi
+
+if [ ! -f "$img" ]; then
+ error "machine image '$img' does not exist"
+fi
+
+# Open the reading file descriptor and lock the machine image. Fail if unable
+# to lock.
+#
+# Note that the file descriptor is automatically closed on the script exit and
+# the lock is released.
+#
+exec {lfd}<"$img"
+
+if ! flock -n "$lfd"; then
+ error "machine is already running"
+fi
+
+del_tap=
+if [ -z "$tap" ]; then
+ tap=tap9
+ sudo ip tuntap delete "$tap" mode tap || true
+ sudo ip tuntap add "$tap" mode tap user "$(whoami)"
+ sudo ip link set "$tap" up
+ #sleep 0.5s
+ sudo ip link set "$tap" master "$br"
+ del_tap=true
+fi
+
+if [ -z "$mon" ]; then
+ mon="/tmp/machine-$tap-mon.sock"
+fi
+
+if [ -z "$con" ]; then
+ con="/tmp/machine-$tap-con.sock"
+fi
+
+ops=(\
+ -m "$ram" \
+ -cpu host -smp "$cpu,sockets=1,cores=$cpu,threads=1" \
+ \
+ -netdev "tap,id=net0,ifname=$tap,script=no" \
+ -device "virtio-net-pci,netdev=net0,mac=$mac" \
+ \
+ -drive "if=none,id=disk0,file=$img,format=raw" \
+ -device "virtio-blk-pci,scsi=off,drive=disk0" \
+ \
+ -nographic \
+)
+
+# Console/monitor options.
+#
+if [ "$stdio" ]; then
+ # Multiplex the monitor and serial console onto stdio. In particular, this
+ # makes sure Ctrl-c is passed to the guest (rather than termination the QEMU
+ # process). To switch between monitor and console, Ctrl-a,c (to terminate
+ # QEMU, type quit in the monitor).
+ #
+ ops+=(-serial mon:stdio)
+else
+ # Monitor.
+ #
+ if [ "$stdio_monitor" ]; then
+ ops+=(-chardev stdio,id=mon)
+ else
+ ops+=(-chardev "socket,id=mon,path=$mon,server,nowait")
+ fi
+
+ ops+=(-mon chardev=mon,mode=readline)
+
+ # Console.
+ #
+ ops+=(-chardev "socket,id=con,path=$con,server,nowait" \
+ -serial chardev:con)
+fi
+
+"${qemu[@]}" "${ops[@]}" -boot c "$@"
+
+if [ "$del_tap" ]; then
+ sudo ip tuntap delete "$tap" mode tap
+fi