How can I import app settings within a script?

Supporting your customers
1

I need to run replicatedctl app-config import < settings.json from within a script, but whenever I use output redirection for the script things break. How can I avoid this?

Here’s a minimal example:

laverya@laverya-script-testing:~$ cat test.sh
#/bin/bash

replicatedctl app-config export > settings.json
replicatedctl app-config import < settings.json

laverya@laverya-script-testing:~$ ./test.sh
Settings import success
laverya@laverya-script-testing:~$ ./test.sh > test.out
Error: decode json: EOF
2

There are several flags that can be provided to replicatedctl that determine how input is passed to the docker exec (or kubectl exec, depending on scheduler), though the relevant one for this issue is -i. If this flag is present, the replicatedctl script will pass it on to docker - where it enables listening to the input stream.

Like this:

laverya@laverya-script-testing:~$ cat test.sh
#/bin/bash

replicatedctl app-config export > settings.json
replicatedctl -i app-config import < settings.json

laverya@laverya-script-testing:~$ ./test.sh
Settings import success
laverya@laverya-script-testing:~$ ./test.sh > test.out
laverya@laverya-script-testing:~$ cat test.out
Settings import success
laverya@laverya-script-testing:~$

There’s a few of these - -i, -t, --no-tty - you can view them all with cat $(which replicatedctl). We do our best to determine the appropriate set of docker flags, but you can always override them when things break!