nix-bitcoin/examples/qemu-vm/run-vm.sh

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qemuDir=$(cd "${BASH_SOURCE[0]%/*}" && pwd)
tmpDir=/tmp/nix-bitcoin-qemu-vm
mkdir -p $tmpDir
# Cleanup on exit
cleanup() {
set +eu
if [[ $qemuPID ]]; then
kill -9 $qemuPID
fi
rm -rf $tmpDir
}
trap "cleanup" EXIT
identityFile=$qemuDir/id-vm
chmod 0600 $identityFile
runVM() {
vm=$1
vmNumCPUs=$2
vmMemoryMiB=$3
sshPort=$4
export NIX_DISK_IMAGE=$tmpDir/img
export QEMU_NET_OPTS=hostfwd=tcp::$sshPort-:22
</dev/null $vm/bin/run-*-vm -m $vmMemoryMiB -smp $vmNumCPUs &>/dev/null &
qemuPID=$!
}
vmWaitForSSH() {
echo
printf "Waiting for SSH connection..."
while ! c : 2>/dev/null; do :; done
echo
}
# Run command in VM
c() {
ssh -p $sshPort -i $identityFile -o ConnectTimeout=1 \
-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=ERROR \
-o ControlMaster=auto -o ControlPath=$tmpDir/ssh-connection -o ControlPersist=60 \
root@127.0.0.1 "$@"
}
export identityFile
export sshPort
export tmpDir
export -f c