fix: auto read dns.extra_records_path instead of making it required

Closes HP-538

app/server/headscale/config-loader.ts

@@ -251,7 +251,7 @@ export async function loadHeadscaleConfig(path?: string, strict = true, dnsPath?
     return new HeadscaleConfig("no");
   }
 
-  const dns = await loadHeadscaleDNS(dnsPath);
+  const dns = await loadHeadscaleDNS(dnsPath ?? config.dns.extra_records_path);
   if (dns && !config.dns.extra_records_path) {
     log.error(
       "config",

config.example.yaml

@@ -101,11 +101,11 @@ headscale:
   config_strict: true
 
   # If you are using `dns.extra_records_path` in your Headscale
-  # configuration, you need to set this to the path for Headplane
-  # to be able to read the DNS records.
+  # configuration, Headplane will read that path automatically. Set
+  # this only when Headplane needs to access the same file at a
+  # different path, such as in Docker bind mounts.
   #
-  # Pass it in if using Docker and ensure that the file is both
-  # readable and writable to the Headplane process.
+  # Ensure that the file is both readable and writable to the Headplane process.
   # When using this, Headplane will no longer need to automatically
   # restart Headscale for DNS record changes.
   # dns_records_path: "/var/lib/headscale/extra_records.json"

docs/NixOS-options.md

@@ -83,7 +83,7 @@ _Default:_ `true`
 
 ## settings.headscale.dns_records_path
 
-_Description:_ If you are using `dns.extra_records_path` in your Headscale configuration, you need to set this to the path for Headplane to be able to read the DNS records.
+_Description:_ If you are using `dns.extra_records_path` in your Headscale configuration, Headplane reads that path automatically. Set this only when Headplane needs to access the same file at a different path.
 Ensure that the file is both readable and writable by the Headplane process.
 When using this, Headplane will no longer need to automatically restart Headscale for DNS record changes.
 

docs/install/docker.md

@@ -123,10 +123,10 @@ services:
       # Headplane config.yaml file.
       - "/path/to/headscale/config.yaml:/etc/headscale/config.yaml"
 
-      # If you are using dns.extra_records in Headscale (recommended), you
-      # should also mount that file here so Headplane can read and write it.
-      # Ensure that the path matches `headscale.dns_records_path` in your
-      # Headplane config.yaml file.
+      # If you are using dns.extra_records_path in Headscale (recommended),
+      # also mount that file here so Headplane can read and write it. If the
+      # in-container path differs from Headscale's dns.extra_records_path,
+      # set `headscale.dns_records_path` in your Headplane config.yaml file.
       - "/path/to/headscale/dns_records.json:/etc/headscale/dns_records.json"
 
       # Read-only access to the Docker socket (or a proxy)