How to set a variable to the output of a `docker-compose restart` command in Bash?

Question

I write a bash shell to detemine docker-compose up or docker-compose restart:

#!/bin/bash
re=$(docker-compose -f prod.yml restart)
echo re:${re}
if [[ -n ${re} && ${re} == *"No containers to restart"* ]];then
  echo -e '\e[0;31;1mNO CONTAINER FOUND. WILL EXEC UP COMMAND...\e[0m'
  docker-compose -f prod.yml up
fi

but each time I exec this script, the var re is always empty. The output of script is:

ERROR: No containers to restart
re:

ERROR: No containers to restart is the output of docker-compose -f prod.yml restart

Is there any way to solve this issue or another way to achieve my goal ?

Add output of docker-compose -f prod.yml restart to your question. — Cyrus
– Cyrus, Commented Jul 21, 2018 at 6:06
Checking for a particular output string is brittle and error-prone. If Docker is at all correctly written, it will set its exit code to reflect whether it succeeded. Then you can simply say if docker-compose -f prod.yml restart; then... — tripleee
– tripleee, Commented Jul 21, 2018 at 6:52

aauutthh · Accepted Answer · 2018-07-21 06:36:50Z

3

You can try to redirect stderr output. For example: re=$(docker-compose -f prod.yml restart 2>&1)

answered Jul 21, 2018 at 6:36

aauutthh

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