dgrove-oss commented on a change in pull request #4570: KCF: propagate
cf_ca_extraArgs_env_i into user containers
URL:
https://github.com/apache/incubator-openwhisk/pull/4570#discussion_r309316353
##########
File path: core/invoker/src/main/resources/application.conf
##########
@@ -93,6 +93,7 @@ whisk {
dns-servers: []
dns-search: []
dns-options: []
+ extra-env-vars: [] # sequence of `key` and/or `key=value` bindings to
add to all user action container environments
Review comment:
I prototyped using a map instead of a seq[k=v] and found an unfortunate
interaction with `transformEnvironment.sh` that makes a map cumbersome to use.
The problem is `transformEnvirovnment.sh` rewrites `_` to `.` which makes it
quite cumbersome to define environment variables whose name contains an `_`
without adding an escape sequence.
For example, consider trying to set `__OW_ALLOW_CONCURRENT=false` via a
`CONFIG_` envar. With a Seq, it is:
```
CONFIG_whisk_containerFactory_containerArgs_extraArgs_env_0=__OW_ALLOW_CONCURRENT=false
```
With a Map, it would be
```
CONFIG_whisk_containerFactory_containerArgs_extraArgs_env___OW_ALLOW_CONCURRENT=false
```
but we also need to somehow escape all the `_` after `env_` to prevent
`transformEnvironment.sh` from converting them to `.`.
So, I think using Seq to avoid needing to escape `_` is a better trade-off
overall.
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