Check for internet connection on make up

[ecotechie]

Is there a way to add a check on the docker.mk file to see if the there is an internet connection and not do a docker-compose pull if not connected?

I sometimes run a dev environment without internet (airplane) and this command fails. I do get around it by running docker-compose up -d, but was wondering...

[BobbyBabes]

I don't know if you're still interested in this. I took the check below from one of my Bash scripts and changed it to fit. You could stick it in a Bash script and alias it.
Variable packetLoss will contain the percentage packet loss of the ping command. For example 0 when 0% packet loss. From this example ping -qc 10 wordpress.com output:

PING wordpress.com (192.0.78.9) 56(84) bytes of data. --- wordpress.com ping statistics --- 10 packets transmitted, 10 received, 0% packet loss, time 21ms rtt min/avg/max/mdev = 42.733/43.114/43.764/0.334 ms

PING wordpress.com (192.0.78.9) 56(84) bytes of data. --- wordpress.com ping statistics --- 10 packets transmitted, 0 received, 100% packet loss, time 117ms

#!/bin/bash

#-- Variable 'packetLoss' must be null (or > 100) before pinging. Because '0' means no packet loss.
packetLoss=
acceptablePacketLoss=0
packetLoss=$(echo $(ping -qc 10 wordpress.com) | sed -r 's|\s*.*,\s*([[:digit:]]*)% packet loss,.*ms$|\1|')
if [ "$packetLoss" -le "$acceptablePacketLoss" ]; then
  make up #-- docker-compose up -d
  return 0
else
  echo -e "Packet loss is $packetLoss%\nAcceptable packet loss is $acceptablePacketLoss%\nSkipping!"
  return 1
fi