engine.#Copy

Signed-off-by: Joel Longtine <joel@dagger.io>

tests/tasks/copy/copy_file.cue

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"alpha.dagger.io/europa/dagger/engine"
+)
+
+engine.#Plan & {
+	actions: {
+		alpine3_15_0: engine.#Pull & {
+			source: "alpine:3.15.0@sha256:e7d88de73db3d3fd9b2d63aa7f447a10fd0220b7cbf39803c803f2af9ba256b3"
+		}
+
+		busybox1_34_1: engine.#Pull & {
+			source: "busybox:1.34.1-glibc@sha256:ec98391b8f0911db08be2ee6c46813eeac17b9625b402ea1ce45dcfcd05d78d6"
+		}
+
+		verify_alpine_3_15_0: engine.#ReadFile & {
+			input: alpine3_15_0.output
+			path:  "/etc/alpine-release"
+		} & {
+			// assert result
+			contents: "3.15.0\n"
+		}
+
+		copy: engine.#Copy & {
+			input: busybox1_34_1.output
+			source: {
+				root: alpine3_15_0.output
+				path: "/etc/alpine-release"
+			}
+			dest: "/alpine3_15_0_release"
+		}
+
+		verify_copy: engine.#ReadFile & {
+			input: copy.output
+			path:  "/alpine3_15_0_release"
+		} & {
+			// assert result
+			contents: "3.15.0\n"
+		}
+	}
+}