make forked bash update its environment itself - Githubissues

leflamm / afpre

CLI for the AWS Federation Proxy

Apache License 2.0

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make forked bash update its environment itself #6

Closed leflamm closed 7 years ago

leflamm commented 7 years ago

vague ideas

maybe hook into PS1 re-rendering, problem: how to call export in string assignment to variable without forking, $() forks, PS1=$(function_that_renders_and_also_export) would be easy... doesn't help here

use command substitution $() (still a fork), but manipulate parent shell via gdb... weird sh*t

better ideas

$ cat rc 
PROMPT_COMMAND="export DDD=\$(date)"
$ bash --rcfile rc 
$ env | grep -i ddd
DDD=Mi 24. Mai 22:45:05 CEST 2017
$ env | grep -i ddd
DDD=Mi 24. Mai 22:45:07 CEST 2017
$ env | grep -i ddd
DDD=Mi 24. Mai 22:45:07 CEST 2017
$ env | grep -i ddd
DDD=Mi 24. Mai 22:45:08 CEST 2017

make actual PROMPT_COMMAND to be conditional on token expiry and perform everything necessary to update the environment, should be possible, see
```
PROMPT_COMMAND="{
export DDD=\$(date)
export UUU=\$(uptime)
}"
```
see https://stackoverflow.com/a/3058390/2124712 for another example

leflamm commented 7 years ago

done