Removal of /s6-init breaks entrypoint overrides

[troykelly]

Versions

Core version is v6.0 (Latest: v6.0)
Web version is v6.0 (Latest: v6.0)
FTL version is v6.0 (Latest: v6.0)

Platform

• OS and version: Debian GNU/Linux 11

• Platform: Docker

Expected behavior

Anybody with old entrypoint overrides will be calling /s6-init as the last command to allow the container to continue to start as intended, ie:

    entrypoint: |
      /bin/sh -c 
      "echo 'server=/61.10.in-addr.arpa./127.0.0.1#953' > /etc/dnsmasq.d/02-custom.conf &&
       echo 'server=/an.example.invalid./127.0.0.1#953' >> /etc/dnsmasq.d/02-custom.conf && 
       echo 'server=/another.example.invalid./127.0.0.1#953' >> /etc/dnsmasq.d/02-custom.conf && 
       echo 'server=/yet.another.example.invalid./127.0.0.1#953' >> /etc/dnsmasq.d/02-custom.conf && 
       exec /s6-init"

Actual behavior / bug

Without the former startup file, pihole keeps restarting.

Steps to reproduce

Steps to reproduce the behavior:

1. Override entrypoint on container
2. Start container

Debug Token

• URL: N/A

Screenshots

If applicable, add screenshots to help explain your problem.

Additional context

I can't see anything announced that the startup entrypoint was changing, but using the new entrypoint resolves the issue.

To resolve this issue, use start.sh

    entrypoint: |
      /bin/sh -c 
      "echo 'server=/61.10.in-addr.arpa./127.0.0.1#953' > /etc/dnsmasq.d/02-custom.conf &&
       echo 'server=/an.example.invalid./127.0.0.1#953' >> /etc/dnsmasq.d/02-custom.conf && 
       echo 'server=/another.example.invalid./127.0.0.1#953' >> /etc/dnsmasq.d/02-custom.conf && 
       echo 'server=/yet.another.example.invalid./127.0.0.1#953' >> /etc/dnsmasq.d/02-custom.conf && 
       exec /usr/bin/start.sh"

Yes, this isn't the greatest hack - but there's no way to persist minor config settings like this without shared volumes, so creating this file on startup is the only real solution.

[PromoFaux]

Thanks, I'll leave this open in case someone else has a similar issue - though I'm not sure how many folk were doing this.

Interesting way around an issue, though. Any reason why you're not just using a volume mount for /etc/dnsmasq.d?

[PromoFaux]

An alternative solution for you, as i've just learned about the existence of this config option

Setting via the web interface stores it in the config file like so:

 dnsmasq_lines = [
    "server=/61.10.in-addr.arpa./127.0.0.1#953",
    "server=/an.example.invalid./127.0.0.1#953"
  ] ### CHANGED, default = []

This could also be set by the environment variable FTLCONF_misc_dnsmasq_lines, although I'm currently struggling to get a value to stick when setting it this way. @DL6ER What is the correct format to pass this in via the environment?

[troykelly]

@PromoFaux have you tried that - because the "=" breaks it.
I spent hours on it this morning trying every possible combo, and I can't get "FTLCONF_misc_dnsmasq_lines" to add anything other than [server, server, "server, 'server

[troykelly]

Thanks, I'll leave this open in case someone else has a similar issue - though I'm not sure how many folk were doing this.

Interesting way around an issue, though. Any reason why you're not just using a volume mount for /etc/dnsmasq.d?

It's "permanent" (in this environment) and the VM's that run pihole only have ephemeral storage, so, rather than giving it a gluster volume for that tiny little file - I have been creating it on start.

FTLCONF_misc_dnsmasq_lines would be an awesome fix for our hack, but the equals in the string breaks the parsing, so I can't put lines like server=1.2.3 in it.

[PromoFaux]

have you tried that - because the "=" breaks it.

Yeah, sorry - that's what I meant by:

, although I'm currently struggling to get a value to stick when setting it this way

FTLCONF_misc_dnsmasq_lines would be an awesome fix

Lets see what DL comes back with...

[troykelly]

have you tried that - because the "=" breaks it.

Yeah, sorry - that's what I meant by:

, although I'm currently struggling to get a value to stick when setting it this way

AH! Sorry!

Yeah - I've tried (what I think is?) every possible iteration of single, double quotes, list/sequence, mapping - I just can't get anything past the "="

[rdwebdesign]

The value is passed to the container.

Inside the container there will be a variable with the value, like:

FTLCONF_misc_dnsmasq_lines=server=/61.10.in-addr.arpa./127.0.0.1#953;server=/an.example.invalid./127.0.0.1#953

But FTL is not correctly parsing values with = and only the initial part (before the equal sign) is written in the file.

[troykelly]

But FTL is not correctly parsing values with = and only the initial part (before the equal sign) is written in the file.

@rdwebdesign Do you want me to create a new ticket for that?

[rdwebdesign]

No need for another issue.
I was just explaining the results of my tests.

We are aware of the issue and we will fix it when we have the time to dig into the code. Just be patient.

[troykelly]

Just be patient

@rdwebdesign appreciate it - thank you.
No urgency needed - the workaround is fine.

[yubiuser]

This is an FTL issue somewhere around
https://github.com/pi-hole/FTL/blob/eaa7dbb4cf4316413558c9d4b4e3f2a44f8e8203/src/config/env.c#L53-L58

[yubiuser]

Fix for the env setting at pi-hole/FTL#2204

[instantdreams]

Same issue as #1718

[PromoFaux]

@troykelly - the latest tag should fix this issue. Please let us know! https://github.com/pi-hole/docker-pi-hole/releases/tag/2025.02.2