stdlib: io for portable I/O interfaces, os for system primitives

Signed-off-by: Solomon Hykes <sh.github.6811@hykes.org>

stdlib/os/os.cue

@@ -0,0 +1,65 @@
+package os
+
+import (
+	"dagger.io/io"
+
+	"dagger.io/dagger"
+	"dagger.io/dagger/op"
+)
+
+#Dir: io.#Dir & {
+	from: dagger.#Artifact
+	path: string
+
+	// Read the tree structure (not file contents)
+	read: tree: {
+		string// FIXME: only raw 'find' output for now
+		#up: [
+			op.#FetchContainer & {
+				ref: "alpine" // FIXME: use alpine or docker package
+			},
+			op.#Exec & {
+				mount: "/data": "from": from
+				args: [
+					"sh", "-c",
+					#"find /data | sed 's/^\/data//' > /export.txt"#,
+				]
+			},
+			op.#Export & {
+				source: "/export.txt"
+				format: "string"
+			},
+		]
+	}
+}
+
+#File: {
+	from: dagger.#Artifact
+	path: string
+
+	io.#Reader & {
+		read: {
+			format: _
+			data: {
+				_
+				#up: [
+					op.#Load & {"from":   from},
+					op.#Export & {source: path, "format": format},
+				]
+			}
+		}
+	}
+
+	io.#Writer & {
+		write: *null | {
+			data: _
+			#up: [
+				op.#Load & {"from": from},
+				op.#WriteFile & {
+					dest:     path
+					contents: data
+				},
+			]
+		}
+	}
+}