Debugging Shepherd Daemon. Possible escape char issue.

Debugging Shepherd Daemon. Possible escape char issue.

[Jesse Millwood]

Hello,

I am trying to run some docker services as an oci-service-configuration 
entry.

I have one simple one running fine. However the one that I am having 
trouble with, I assume is an issue with quoting and escaping. I don't 
see any issue in /var/log/messages. I'd like to be able to see the 
actual command that Shepherd is trying to run. Is there a way to do that?

The Shepherd service I am trying to run is this:


(service oci-container-service-type
   (list
    (oci-container-configuration
     (image "traefik/whoami")
     (network "traefik-network")
     (extra-arguments
      '("--label"
"traefik.http.routers.whoami.rule=Host\(\\\"whoami.geekslab\\\")"))
     (log-file "/var/docker.whoami.log")
    )
))

The only feedback I get is this:

admin@geekslab ~/geekslab/scripts$ sudo herd status docker-whoami
Status of docker-whoami:
  It is stopped.
  It is enabled.
  Provides (docker-whoami).
  Requires (dockerd user-processes).
  Will not be respawned.

admin@geekslab ~/geekslab/scripts$ sudo herd start docker-whoami
  Service user-homes has been started.
  Service dockerd depends on elogind.
  Service docker-whoami depends on dockerd.
  herd: error: failed to start service docker-whoami

As stated before, nothing in /var/log/messages. I'm not sure where else 
to look. I feel like I'm missing something when trying to debug Shepherd 
services. I've also tried a lot of different combinations of escapes and 
such.

If I run the following from the shell though, it works fine:

sudo docker run --rm --name whoami --label 
"traefik.http.routers.whoami.rule=Host(\"whoami.geekslab\")" traefik/whoami

Notice the escaped quotes that need to be passed through. I am 
essentially trying to daemonize this docker run command.

Any Shepherd pointers here would be appreciated!

Re: Debugging Shepherd Daemon. Possible escape char issue.

[Felix Lechner via]

Hi Jesse,

On Fri, Nov 29 2024, Jesse Millwood wrote:

> "traefik.http.routers.whoami.rule=Host\(\\\"whoami.geekslab\\\")"

It's a bit of a long short, but I might try:

> "traefik.http.routers.whoami.rule=Host(\"whoami.geekslab\")"

I dropped the escape from the opening parenthesis \( which which worked
on Geiser but seemed not needed.

Perhaps more significantly, I also the dropped escape character \\
before each of the escaped quotes because I'm not sure the Shepherd
offers shell expansion.

Kind regards
Felix

Re: Debugging Shepherd Daemon. Possible escape char issue.

[Jesse Millwood]

Thanks Felix,

I tried that just now and get the same exact error message when trying 
to start it.

Fwiw, this is in my operating system guile file. I run "sudo guix system 
-L <path-to-modules>/modules system.scm", where I have my services 
defined in modules in the modules directory structure. Then I try to run 
"sudo herd start docker-whoami" but I get the same error message on the 
cli but I don't see any error messages in /var/log/messages.

Is there a better interactive way to try running these services for 
debugging purposes?

On 11/29/24 16:25, Felix Lechner via wrote:
> Hi Jesse,
>
> On Fri, Nov 29 2024, Jesse Millwood wrote:
>
>> "traefik.http.routers.whoami.rule=Host\(\\\"whoami.geekslab\\\")"
> It's a bit of a long short, but I might try:
>
>> "traefik.http.routers.whoami.rule=Host(\"whoami.geekslab\")"
> I dropped the escape from the opening parenthesis \( which which worked
> on Geiser but seemed not needed.
>
> Perhaps more significantly, I also the dropped escape character \\
> before each of the escaped quotes because I'm not sure the Shepherd
> offers shell expansion.
>
> Kind regards
> Felix
>