Cannot pipe stdin to kafkacat

[Nekroze]

Bug Report

Describe the bug

Cannot pipe a file (eg. via cat) into the kafkacat app for writing data to kafka.

To Reproduce

Steps to reproduce the behavior:

1. Run dab apps run kafkacat -C -b kafka -t test
2. Run echo "test" | kafkacat -P -b kafka -t test
3. See no test message in the consumer (first) command.

Expected behavior

Kafkacat should get the data and write it.

Example

None.

dab version output

Dab Version: 5f8f19f1a39c5b5b8c7a4ae160031e0dab38c24a
Server Version: 18.09.0
Runtimes: runc
Kernel Version: 4.14.88
Operating System: NixOS 18.09.1676.7e88992a8c7 (Jellyfish)
Architecture: x86_64

Additional context

None.

[Nekroze]

Issue is likely things being called in subshells are not propagating stdin etc. Could try detect and manually direct it in or perhaps using exec to replace the subshell process in the right places can keep stdin.

[Nekroze]

At least for kafkacat producer mode you can still type stuff in manually but this issue also exists for piping stdout from dab into another command as well.