Docker debug image, Fluent Bit 1.9: section 'in_exec' tried to instance a plugin name that don't exists

[Neki]

Bug Report

Describe the bug

The Fluentbit 1.9 Docker image does not start when the exec input plugin is used, even with the "debug" image.

To Reproduce

Run

docker run fluent/fluent-bit:1.9.9-debug /fluent-bit/bin/fluent-bit -i exec -p 'command=ls /etc' -o stdout

Output:

Fluent Bit v1.9.9
* Copyright (C) 2015-2022 The Fluent Bit Authors
* Fluent Bit is a CNCF sub-project under the umbrella of Fluentd
* https://fluentbit.io

[2022/10/19 08:24:43] [error] [config] section 'exec' tried to instance a plugin name that don't exists
[2022/10/19 08:24:43] [error] configuration file contains errors, aborting.

Expected behavior

The Fluent Bit container should start.

Your Environment

• Version used: 1.9.9, "debug" Docker image
• Configuration: see arguments above
• Environment name and version: local (Mac M1, Apple Silicon)
• Server type and version: N/A
• Operating System and version: Mac OS 12.5.1
• Filters and plugins: exec input plugin

Additional context

I'm trying to use the exec plugin in a configuration file, but Fluent Bit always fails with [error] [config] section 'in_exec' tried to instance a plugin name that don't exists.

The command line above is the simplest way to reproduce the error.

[patrick-stephens]

The exec plugin is disabled for containers - it cannot work in the production image as it requires /bin/sh and the debug image uses the same binary as the production image.

• fluent-bit/dockerfiles/Dockerfile

  Line 71 in 1969007

  -DFLB_IN_EXEC=Off \

• dockerfiles: disable exec plugin for distroless containers #4719