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METADATA=http://metadata.google.internal/computeMetadata/v1
SVC_ACCT=$METADATA/instance/service-accounts/default
ACCESS_TOKEN=$(curl -H 'Metadata-Flavor: Google' $SVC_ACCT/token | cut -d'"' -f 4)

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gcloud config configurations list
gcloud config configurations activate MY_OLD_CONFIG
gcloud_switch xxx

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I develop on a Macbook inside an Ubuntu VM.

Mac needs drivers: https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers

Then installation of toolchain and ESP32 looks like this:

# Install USB serial drivers
apt-get install linux-image-extra-virtual

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<snippet>
  <content><![CDATA[
#!/usr/bin/env ${1:bash}
]]></content>
  <!-- Optional: Set a tabTrigger to define how to trigger the snippet -->
  <tabTrigger>#!</tabTrigger>
  <!-- Optional: Set a scope to limit where the snippet will trigger -->
  <!-- <scope>source.bash</scope> -->
</snippet>

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# https://cloud.google.com/compute/docs/disks/add-persistent-disk#resize_partitions

sudo growpart /dev/sda 1
sudo resize2fs /dev/sda

sudo resize2fs /dev/sdb

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eval "for i, name in ipairs(redis.call('KEYS', 'pattern-*')) do redis.call('DEL', name); end" 0

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# using VirtualBox version $VBOX_VERSION

FROM boot2docker/boot2docker
RUN apt-get install p7zip-full

RUN mkdir -p /vboxguest && \
    cd /vboxguest && \
    curl -L -o vboxguest.iso http://download.virtualbox.org/virtualbox/$VBOX_VERSION/VBoxGuestAdditions_$VBOX_VERSION.iso && \
    7z x vboxguest.iso -ir'!VBoxLinuxAdditions.run' && \
    sh VBoxLinuxAdditions.run --noexec --target . && \

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openssl genrsa -out server-ca-key.pem 4096
openssl req -x509 -new -key server-ca-key.pem -days 1825 -out server-ca.pem -subj '/C=US/ST=California/L=Palo Alto/O=Organization/CN=Debug Root CA'
openssl genrsa -out server-key.pem 4096
openssl req -subj '/CN=*' -sha256 -new -key server-key.pem -out server.csr
echo "subjectAltName = IP:127.0.0.1" > server-extfile.cnf
openssl x509 -req -days 1825 -sha256 -in server.csr -CA server-ca.pem -CAkey server-ca-key.pem -CAcreateserial -out server.pem -extfile server-extfile.cnf

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du -sch * ./
ncdu

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ws = new WebSocket("ws://localhost:8080");
ws.onopen = function(evt) {
  console.log("OPEN");
}

ws.onclose = function(evt) {
  console.log("CLOSE");
  ws = null;
}