feat: add extra_filesystems config option

Author: vernette

README.md

@@ -75,6 +75,9 @@ config agent 'agent'
   # (see https://beszel.dev/guide/security for details)
   option hub_url 'https://YOUR_BESZEL_HUB_URL_HERE'
   option token 'YOUR_AGENT_TOKEN_HERE'
+
+  # optional, monitor extra disks (comma-separated, `device__label`)
+  option extra_filesystems 'sda1__NAS'
 ```
 
 Get your authentication key (and agent token, if necessary) from the Beszel hub when adding a new system.

beszel-agent/files/beszel-agent.config

@@ -4,4 +4,5 @@ config agent 'agent'
 	option public_key ''
 	option hub_url ''      # optional, for outbound mode (websockets)
 	option token ''        # optional, for outbound mode (websockets)
+	option extra_filesystems ''  # optional, comma-separated, e.g. 'sda1__NAS'
 

beszel-agent/files/beszel-agent.init

@@ -7,14 +7,15 @@ USE_PROCD=1
 PROG=/usr/bin/beszel-agent
 
 start_service() {
-  local enabled port key url token
+  local enabled port key url token extra_fs
 
   config_load 'beszel-agent'
   config_get_bool enabled 'agent' 'enabled' '0'
   config_get port 'agent' 'port' '45876'
   config_get key 'agent' 'public_key' ''
   config_get url 'agent' 'hub_url' ''
   config_get token 'agent' 'token' ''
+  config_get extra_fs 'agent' 'extra_filesystems' ''
 
   [ "$enabled" -eq 0 ] && return 0
 
@@ -39,6 +40,7 @@ start_service() {
   }
 
   procd_set_param env DATA_DIR=/usr/share/beszel-agent
+  [ -n "$extra_fs" ] && procd_append_param env EXTRA_FILESYSTEMS="$extra_fs"
   procd_set_param respawn 3600 5 5
   procd_set_param stdout 1
   procd_set_param stderr 1