fix(docker_refresh): Skip recreation for unchanged images

docker_refresh.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3
+#!/usr/bin/env -S uv run --script
 # /// script
 # dependencies = []
 # ///
@@ -22,6 +22,7 @@ class Project:
     files: tuple[Path, ...]
     environment_files: tuple[Path, ...]
     services: set[str] = field(default_factory=set)
+    running_images: dict[str, set[str]] = field(default_factory=dict)
 
     def command(self) -> list[str]:
         command = [
@@ -116,6 +117,7 @@ def discover_projects(containers: list[dict[str, Any]], selected_projects: set[s
         if (existing.directory, existing.files, existing.environment_files) != (project.directory, project.files, project.environment_files):
             raise ValueError(f"Project {name}: containers have inconsistent Compose file labels")
         existing.services.add(service)
+        existing.running_images.setdefault(service, set()).add(container.get("Image") or "")
     return sorted(projects.values(), key=lambda project: project.name)
 
 
@@ -148,13 +150,30 @@ def refresh_project(project: Project, dry_run: bool) -> None:
             services.append(name)
     if not services:
         return
-    for arguments in (
-        ["pull", "--policy", "always", *services],
-        ["up", "--detach", "--no-deps", "--no-build", "--pull", "never", *services],
-    ):
-        logging.info("%s", shlex.join([*command, *arguments]))
-        if not dry_run:
-            subprocess.run(args=[*command, *arguments], cwd=project.directory, check=True)
+    pull_command = [*command, "pull", "--policy", "always", *services]
+    logging.info("%s", shlex.join(pull_command))
+    if not dry_run:
+        subprocess.run(args=pull_command, cwd=project.directory, check=True)
+        changed_services = []
+        for name in services:
+            result = subprocess.run(
+                args=["docker", "image", "inspect", "--format", "{{.Id}}", configured_services[name]["image"]],
+                check=True, capture_output=True, text=True, timeout=60,
+            )
+            image_id = result.stdout.strip()
+            if not image_id:
+                raise ValueError(f"Project {project.name}: image ID is missing for service {name}")
+            if project.running_images.get(name) == {image_id}:
+                logging.info("Skipping %s/%s: running image is up to date", project.name, name)
+            else:
+                changed_services.append(name)
+        services = changed_services
+    if not services:
+        return
+    up_command = [*command, "up", "--detach", "--no-deps", "--no-build", "--pull", "never", *services]
+    logging.info("%s", shlex.join(up_command))
+    if not dry_run:
+        subprocess.run(args=up_command, cwd=project.directory, check=True)
 
 
 def main() -> int: