Check whether images have changed

src/compose.rs

@@ -1,4 +1,5 @@
 use std::collections::HashSet;
+use std::fmt;
 use std::path::{Path, PathBuf};
 use std::process::Command;
 
@@ -39,3 +40,9 @@ impl ComposeProject {
         stdout.trim().split('\n').map(String::from).collect()
     }
 }
+
+impl fmt::Display for ComposeProject {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.compose_file.display())
+    }
+}

src/main.rs

@@ -33,7 +33,20 @@ fn get_files(files: &[String]) -> Option<Vec<PathBuf>> {
 }
 
 fn do_update(compose_project: compose::ComposeProject) {
+    info!("Processing {}...", compose_project);
+    let pre_images = compose_project.get_images();
+    if pre_images.is_empty() {
+        warn!("no running images, skipping");
+        return;
+    }
+
     compose_project.pull();
+
+    let post_images = compose_project.get_images();
+
+    if post_images == pre_images {
+        info!("No change to images");
+    }
 }
 
 fn main() {