Add persistent job claim and file artifact reads

runtime/file_execution.go

@@ -101,6 +101,21 @@ func (executor *FileExecutor) scopeForAssignment(assignment protocol.RunJobAssig
 	return scope, false, err
 }
 
+func (executor *FileExecutor) existingReadTargetForAssignment(assignment protocol.RunJobAssignment) (string, string, bool, error) {
+	scope, deploymentRoot, err := executor.scopeForAssignment(assignment)
+	if err != nil {
+		return "", "", false, err
+	}
+	targetKey := assignment.TargetKey
+	if deploymentRoot {
+		targetKey = deploymentTargetKey(targetKey)
+		filePath, err := existingDeploymentTarget(scope, targetKey)
+		return scope, filePath, deploymentRoot, err
+	}
+	filePath, err := executor.resolver.ExistingTarget(scope, targetKey)
+	return scope, filePath, deploymentRoot, err
+}
+
 type fileListEntry struct {
 	Name         string `json:"name"`
 	Kind         string `json:"kind"`
@@ -175,11 +190,12 @@ func (executor *FileExecutor) list(ctx context.Context, scope string, deployment
 		if err != nil {
 			return err
 		}
-		logicalKey := path.Join(directoryKey, rel)
+		entryRelativePath := rel
 		if relativePath != "." {
-			logicalKey = path.Join(directoryKey, relativePath, rel)
+			entryRelativePath = path.Join(relativePath, rel)
 		}
-		candidate := append(entries, fileListEntry{Name: name, Kind: kind, RelativePath: rel, LogicalKey: logicalKey, SizeBytes: entryInfo.Size(), ModifiedAt: entryInfo.ModTime().UTC().Format(time.RFC3339Nano)})
+		logicalKey := path.Join(directoryKey, entryRelativePath)
+		candidate := append(entries, fileListEntry{Name: name, Kind: kind, RelativePath: entryRelativePath, LogicalKey: logicalKey, SizeBytes: entryInfo.Size(), ModifiedAt: entryInfo.ModTime().UTC().Format(time.RFC3339Nano)})
 		body, marshalErr := json.Marshal(fileListEnvelope{DirectoryKey: directoryKey, Path: strings.TrimPrefix(relativePath, "."), Entries: candidate})
 		if marshalErr != nil {
 			return marshalErr