Add plugin script shellless

.gitignore

@@ -0,0 +1 @@
+__pycache__/

plugins/elements/script_shellless.py

@@ -0,0 +1,49 @@
+from buildstream import Element, ElementError, Scope
+
+
+class ScriptShelllessElement(Element):
+    __root_read_only:bool
+    __commands:list
+
+    BST_FORBID_RDEPENDS = True
+
+    def configure(self, node):
+        # Get data
+        self.__root_read_only = self.node_get_member(node, bool, 'root_read_only', None)
+        self.__commands = self.node_get_member(node, list, 'commands', None)
+
+    def preflight(self):
+        pass
+
+    def get_unique_key(self):
+        return {'version': 6, "root_read_only": self.__root_read_only, "commands": self.__commands}
+
+    def configure_sandbox(self, sandbox):
+        sandbox.set_environment(self.get_environment())
+
+    def stage(self, sandbox):
+        for build_dep in self.dependencies(Scope.BUILD, recurse=False):
+            with self.timed_activity("Staging {} at /".format(build_dep.name), silent_nested=True):
+                build_dep.stage_dependency_artifacts(sandbox, Scope.RUN, path="/")
+        for build_dep in self.dependencies(Scope.BUILD, recurse=False):
+            with self.timed_activity("Integrating {}".format(build_dep.name), silent_nested=True):
+                for dep in build_dep.dependencies(Scope.RUN):
+                    dep.integrate(sandbox)
+
+    def assemble(self, sandbox):
+        for command in self.__commands:
+            self.status("Running command", detail=" ".join(command))
+            #self.status(sandbox.get_virtual_directory())
+            exitcode = sandbox.run(command, SandboxFlags.ROOT_READ_ONLY if self.__root_read_only else 0, cwd="/")
+            print("Command: %s Exit: %i" % (repr(" ".join(command)), exitcode))
+            if exitcode != 0:
+                raise ElementError("Command '{}' failed with exitcode {}".format(" ".join(command), exitcode))
+
+        # Return where the result can be collected from
+        return "/"
+
+
+
+# Plugin entry point
+def setup():
+    return ScriptShelllessElement

plugins/elements/script_shellless.yaml

@@ -0,0 +1,7 @@
+variables:
+    cwd: /
+
+config:
+  root-read-only: False
+  # List of list of arguments
+  commands: []

project.conf

@@ -6,3 +6,9 @@ format-version: 17
 
 # Subdirectory where elements are stored
 element-path: elements
+
+plugins:
+    -   origin: local
+        path: plugins/elements
+        elements:
+            script_shellless: 0