prune: dry-run gates bump_timestamp

Author: vrutkovs

src/cmd-prune

@@ -86,6 +86,10 @@ else:
 
 print(f"prune: new builds: {new_builds}")
 
+if len(builds_to_delete) == 0 or args.dry_run:
+    print(f"prune: not removing any builds")
+    sys.exit(0)
+
 # create a new builds list
 builds.raw()['builds'] = []
 for build in reversed(new_builds):
@@ -94,22 +98,18 @@ for build in reversed(new_builds):
 
 builds.bump_timestamp()
 
-if len(builds_to_delete) == 0:
-    print("prune: not removing any builds")
-else:
-    buildids = [x.id for x in builds_to_delete]
-    print(f"prune: removing {' '.join(buildids)}")
+buildids = [x.id for x in builds_to_delete]
+print(f"prune: removing {' '.join(buildids)}")
 
 # now delete other build dirs not in the manifest
 error_during_pruning = False
 for build in builds_to_delete:
     print(f"Pruning {build}")
-    if not args.dry_run:
-        try:
-            rmtree(os.path.join(builds_dir, build.id))
-        except Exception as e:
-            error_during_pruning = True
-            print(f"{e}")
+    try:
+        rmtree(os.path.join(builds_dir, build.id))
+    except Exception as e:
+        error_during_pruning = True
+        print(f"{e}")
 
 if error_during_pruning:
     sys.exit(1)