Also replace HashMap with LinkedHashMap to keep service order

Cargo.lock

@@ -220,6 +220,12 @@ version = "0.2.152"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "13e3bf6590cbc649f4d1a3eefc9d5d6eb746f5200ffb04e5e142700b8faa56e7"
 
+[[package]]
+name = "linked-hash-map"
+version = "0.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0717cef1bc8b636c6e1c1bbdefc09e6322da8a9321966e8928ef80d20f7f770f"
+
 [[package]]
 name = "log"
 version = "0.4.20"
@@ -250,6 +256,7 @@ dependencies = [
  "graph-cycles",
  "hhmmss",
  "libc",
+ "linked-hash-map",
  "nix",
  "petgraph",
  "serde",

Cargo.toml

@@ -12,6 +12,7 @@ daemonize = "0.5.0"
 
 serde = { version = "1.0", features = ["derive"] }
 toml = { version = "0.8.8", features = ["preserve_order"] }
+linked-hash-map = "0.5.6"
 shlex = "1.3.0"
 
 petgraph = "0.6.4"

src/main.rs

@@ -19,7 +19,7 @@ struct Data {
     pub epoll: nix::sys::epoll::Epoll,
     pub sigfd: nix::sys::signalfd::SignalFd,
     pub work_queue: Option<std::sync::mpsc::Sender<WorkItem>>,
-    pub services: std::collections::HashMap<u64, service::Service>
+    pub services: linked_hash_map::LinkedHashMap<u64, service::Service>
 }
 impl Data {
     fn new() -> Self {
@@ -35,7 +35,7 @@ impl Data {
             epoll,
             sigfd,
             work_queue: None,
-            services: std::collections::HashMap::new()
+            services: Default::default()
         }
     }