Implement git commit hash tracking for build display

- Add get_git_commit() method to read /var/lib/cm-dashboard/git-commit
- Replace NixOS build version with actual git commit hash
- Show deployed commit hash as 'Build:' value for accurate tracking
- Enable verification of which exact commit is deployed per host
- Update version to 0.1.42

Cargo.lock

@@ -270,7 +270,7 @@ checksum = "a1d728cc89cf3aee9ff92b05e62b19ee65a02b5702cff7d5a377e32c6ae29d8d"
 
 [[package]]
 name = "cm-dashboard"
-version = "0.1.38"
+version = "0.1.40"
 dependencies = [
  "anyhow",
  "chrono",
@@ -291,7 +291,7 @@ dependencies = [
 
 [[package]]
 name = "cm-dashboard-agent"
-version = "0.1.38"
+version = "0.1.40"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -314,7 +314,7 @@ dependencies = [
 
 [[package]]
 name = "cm-dashboard-shared"
-version = "0.1.38"
+version = "0.1.40"
 dependencies = [
  "chrono",
  "serde",

agent/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard-agent"
-version = "0.1.39"
+version = "0.1.42"
 edition = "2021"
 
 [dependencies]

agent/src/collectors/nixos.rs

@@ -37,6 +37,22 @@ impl NixOSCollector {
     }
 
     /// Get configuration hash from deployed nix store system
+    /// Get git commit hash from rebuild process
+    fn get_git_commit(&self) -> Result<String, Box<dyn std::error::Error>> {
+        let commit_file = "/var/lib/cm-dashboard/git-commit";
+        match std::fs::read_to_string(commit_file) {
+            Ok(content) => {
+                let commit_hash = content.trim();
+                if commit_hash.len() >= 7 {
+                    Ok(commit_hash.to_string())
+                } else {
+                    Err("Git commit hash too short".into())
+                }
+            }
+            Err(e) => Err(format!("Failed to read git commit file: {}", e).into())
+        }
+    }
+
     fn get_config_hash(&self) -> Result<String, Box<dyn std::error::Error>> {
         // Read the symlink target of /run/current-system to get nix store path
         let output = Command::new("readlink")
@@ -74,25 +90,25 @@ impl Collector for NixOSCollector {
         let mut metrics = Vec::new();
         let timestamp = chrono::Utc::now().timestamp() as u64;
 
-        // Collect NixOS build information (config hash)
-        match self.get_config_hash() {
-            Ok(config_hash) => {
+        // Collect git commit information (shows what's actually deployed)
+        match self.get_git_commit() {
+            Ok(git_commit) => {
                 metrics.push(Metric {
                     name: "system_nixos_build".to_string(),
-                    value: MetricValue::String(config_hash),
+                    value: MetricValue::String(git_commit),
                     unit: None,
-                    description: Some("NixOS deployed configuration hash".to_string()),
+                    description: Some("Git commit hash of deployed configuration".to_string()),
                     status: Status::Ok,
                     timestamp,
                 });
             }
             Err(e) => {
-                debug!("Failed to get config hash: {}", e);
+                debug!("Failed to get git commit: {}", e);
                 metrics.push(Metric {
                     name: "system_nixos_build".to_string(),
                     value: MetricValue::String("unknown".to_string()),
                     unit: None,
-                    description: Some("NixOS config hash (failed to detect)".to_string()),
+                    description: Some("Git commit hash (failed to detect)".to_string()),
                     status: Status::Unknown,
                     timestamp,
                 });

dashboard/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard"
-version = "0.1.39"
+version = "0.1.42"
 edition = "2021"
 
 [dependencies]

dashboard/src/main.rs

@@ -14,7 +14,7 @@ use app::Dashboard;
 
 /// Get hardcoded version
 fn get_version() -> &'static str {
-    "v0.1.33"
+    "v0.1.42"
 }
 
 /// Check if running inside tmux session

dashboard/src/ui/mod.rs

@@ -246,20 +246,12 @@ impl TuiApp {
                     if let Some(hostname) = self.current_host.clone() {
                         // Create command that shows CM Dashboard logo and then rebuilds
                         let logo_and_rebuild = format!(
-                            "echo ''; \
-                             echo -e '\\033[1;32m  _____ __  __   _____            _     _                         _ \\033[0m'; \
-                             echo -e '\\033[1;32m / ____|  \\/  | |  __ \\          | |   | |                       | |\\033[0m'; \
-                             echo -e '\\033[1;32m| |    | \\  / | | |  | | __ _ ___| |__ | |__   ___   __ _ _ __ __| |\\033[0m'; \
-                             echo -e '\\033[1;32m| |    | |\\/| | | |  | |/ _` / __| \\'_ \\| \\'_ \\ / _ \\ / _` | \\'__/ _` |\\033[0m'; \
-                             echo -e '\\033[1;32m| |____| |  | | | |__| | (_| \\__ \\ | | | |_) | (_) | (_| | | | (_| |\\033[0m'; \
-                             echo -e '\\033[1;32m \\_____|_|  |_| |_____/ \\__,_|___/_| |_|_.__/ \\___/ \\__,_|_|  \\__,_|\\033[0m'; \
-                             echo ''; \
-                             echo -e '\\033[1;33m                    NixOS System Rebuild\\033[0m'; \
-                             echo -e '\\033[1;32m                       Target: {}\\033[0m'; \
-                             echo ''; \
-                             echo -e '\\033[1;90m────────────────────────────────────────────────────────────────────────────────\\033[0m'; \
-                             echo ''; \
-                             ssh -tt {}@{} 'bash -ic {}'",
+                            r"cat << 'EOF'
+NixOS System Rebuild
+Target: {}
+
+EOF
+ssh -tt {}@{} 'bash -ic {}'",
                             hostname,
                             self.config.ssh.rebuild_user,
                             hostname,
@@ -576,7 +568,7 @@ impl TuiApp {
         // Left side: "cm-dashboard" text
         let left_span = Span::styled(
             " cm-dashboard", 
-            Style::default().fg(Theme::background()).bg(background_color)
+            Style::default().fg(Theme::background()).bg(background_color).add_modifier(Modifier::BOLD)
         );
         let left_title = Paragraph::new(Line::from(vec![left_span]))
             .style(Style::default().bg(background_color));
@@ -716,7 +708,7 @@ impl TuiApp {
                 host_widgets.system_scroll_offset
             };
             let host_widgets = self.get_or_create_host_widgets(&hostname);
-            host_widgets.system_widget.render_with_scroll(frame, inner_area, scroll_offset);
+            host_widgets.system_widget.render_with_scroll(frame, inner_area, scroll_offset, &hostname);
         }
     }
 

dashboard/src/ui/theme.rs

@@ -292,12 +292,6 @@ impl Components {
 }
 
 impl Typography {
-    /// Main title style (dashboard header)
-    pub fn title() -> Style {
-        Style::default()
-            .fg(Theme::primary_text())
-            .bg(Theme::background())
-    }
 
     /// Widget title style (panel headers) - bold bright white
     pub fn widget_title() -> Style {

dashboard/src/ui/widgets/system.rs

@@ -439,12 +439,12 @@ impl Widget for SystemWidget {
 
 impl SystemWidget {
     /// Render with scroll offset support
-    pub fn render_with_scroll(&mut self, frame: &mut Frame, area: Rect, scroll_offset: usize) {
+    pub fn render_with_scroll(&mut self, frame: &mut Frame, area: Rect, scroll_offset: usize, hostname: &str) {
         let mut lines = Vec::new();
 
         // NixOS section
         lines.push(Line::from(vec![
-            Span::styled("NixOS:", Typography::widget_title())
+            Span::styled(format!("NixOS {}:", hostname), Typography::widget_title())
         ]));
         
         let build_text = self.nixos_build.as_deref().unwrap_or("unknown");

shared/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard-shared"
-version = "0.1.39"
+version = "0.1.42"
 edition = "2021"
 
 [dependencies]