imp(hostname): make hostname optional

- generic nixosconfig be known that are hydrated with a target-ip
  during runtime (e.g. from a remote source)
- Example: auto scaling groups

src/cli.rs

@@ -6,7 +6,7 @@
 use std::collections::HashMap;
 use std::io::{stdin, stdout, Write};
 
-use clap::{ArgMatches, FromArgMatches, Parser};
+use clap::{Parser};
 
 use crate as deploy;
 
@@ -69,6 +69,11 @@ fn print_deployment(parts: &[&data::DeployData]) -> Result<(), toml::ser::Error>
     let mut part_map: HashMap<String, HashMap<String, PromptPart>> = HashMap::new();
 
     for data in parts {
+        let hostname = if let Some(x) = &data.node.node_settings.hostname {
+            x
+        } else {
+            panic!()
+        };
         part_map
             .entry(data.node_name.to_string())
             .or_insert_with(HashMap::new)
@@ -78,7 +83,7 @@ fn print_deployment(parts: &[&data::DeployData]) -> Result<(), toml::ser::Error>
                     user: &data.profile_user,
                     ssh_user: &data.ssh_user,
                     path: &data.profile.profile_settings.path,
-                    hostname: &data.node.node_settings.hostname,
+                    hostname,
                     ssh_opts: &data.merged_settings.ssh_opts,
                 },
             );

src/data.rs

@@ -306,8 +306,8 @@ pub struct DeployData<'a> {
 pub enum DeployDataError {
     #[error("Neither `user` nor `sshUser` are set for profile {0} of node {1}")]
     NoProfileUser(String, String),
-    #[error("Value `hostname` is not define for profile {0} of node {1}")]
-    NoProfileHost(String, String),
+    #[error("Value `hostname` is not define for node {0}")]
+    NoHost(String),
 }
 
 #[derive(Parser, Debug, Clone, Default)]
@@ -400,7 +400,11 @@ impl<'a> DeployData<'a> {
         };
         let hostname = match hostname {
             Some(x) => x,
-            None => &node.node_settings.hostname,
+            None => if let Some(ref x) = node.node_settings.hostname {
+                x
+            } else {
+              return Err(DeployDataError::NoHost(node_name));
+            },
         };
         let ssh_uri = format!("ssh://{}@{}", &ssh_user, &hostname);
 

src/settings.rs

@@ -71,7 +71,7 @@ impl GenericSettings {
 
 #[derive(Deserialize, Debug, Clone)]
 pub struct NodeSettings {
-    pub hostname: String,
+    pub hostname: Option<String>,
     pub profiles: HashMap<String, Profile>,
     #[serde(
         skip_serializing_if = "Vec::is_empty",