runctl

Manage multiple environment variable setups.

A lot of tools take their configuraetion from environment variables. For certain configurations several environment variables have to be set simulateneously and switching between configurations becomes cumbersome or one has to create wrapper scripts etc. This is where runctl comes to help.

Define your environment variables configurations

create file test.yaml:

myenv:
  - name: FOO
    value: foo 
    action: new
  - name: BAR
    value: bar 
    action: new
otherenv:
  - name: BAR
    value: barother
    action: replace
  - name: BAZ
    value: baz 
    action: merge
    separator: ":"

Run any shell command within specified environment (`myenv`):

runctl -config-file test.yaml -config myenv -- 'echo $BAR'

output is:

bar

then run the same command using different environment configuration (otherenv)

runctl -config-file test.yaml -config otherenv -- 'echo $BAR'

output is:

barother

And of course one can use environment variables runctl_CONFIG and runctl_ENV to streamline use of runctl even further and have it as inobtrusive as possible:

export RUNCTL_CONFIG=test.yaml
export RUNCTL_ENV=myenv

runctl echo '$BAR'

Action: new

only set variable if it hasn't been already set

Action: replace

default behavior: replace existing variable value

Action: merge

treat variable as array splitting using separator, append value to existing array

Action: unset

unset existing value - as if it was never set to begin with

droopy4096/runctl