update

cue.mod/pkg/universe.dagger.io/bash/bash.cue

@@ -0,0 +1,60 @@
+// Helpers to run bash commands in containers
+package bash
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/dagger/core"
+
+	"universe.dagger.io/docker"
+)
+
+// Run a bash script in a Docker container
+//  Since this is a thin wrapper over docker.#Run, we embed it.
+//  Whether to embed or wrap is a case-by-case decision, like in Go.
+#Run: {
+	// The script to execute
+	script: {
+		// A directory containing one or more bash scripts
+		directory: dagger.#FS
+
+		// Name of the file to execute
+		filename: string
+
+		_directory: directory
+		_filename:  filename
+	} | {
+		// Script contents
+		contents: string
+
+		_filename: "run.sh"
+		_write:    core.#WriteFile & {
+			input:      dagger.#Scratch
+			path:       _filename
+			"contents": contents
+		}
+		_directory: _write.output
+	}
+
+	// Arguments to the script
+	args: [...string]
+
+	// Where in the container to mount the scripts directory
+	_mountpoint: "/bash/scripts"
+
+	docker.#Run & {
+		command: {
+			name:   "bash"
+			"args": ["\(_mountpoint)/\(script._filename)"] + args
+			// FIXME: make default flags overrideable
+			flags: {
+				"--norc": true
+				"-e":     true
+				"-o":     "pipefail"
+			}
+		}
+		mounts: "Bash scripts": {
+			contents: script._directory
+			dest:     _mountpoint
+		}
+	}
+}

cue.mod/pkg/universe.dagger.io/bash/test/data/hello.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo Hello, world > /out.txt

cue.mod/pkg/universe.dagger.io/bash/test/test.bats

@@ -0,0 +1,10 @@
+setup() {
+    load '../../bats_helpers'
+
+    common_setup
+}
+
+@test "bash" {
+    dagger "do" -p ./test.cue test
+}
+

cue.mod/pkg/universe.dagger.io/bash/test/test.cue

@@ -0,0 +1,50 @@
+package bash
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/dagger/core"
+
+	"universe.dagger.io/docker"
+	"universe.dagger.io/bash"
+)
+
+dagger.#Plan & {
+	actions: test: {
+
+		_pull: docker.#Pull & {
+			source: "index.docker.io/debian"
+		}
+		_image: _pull.output
+
+		// Run a script from source directory + filename
+		runFile: {
+
+			dir:   _load.output
+			_load: core.#Source & {
+				path: "./data"
+				include: ["*.sh"]
+			}
+
+			run: bash.#Run & {
+				input: _image
+				export: files: "/out.txt": _
+				script: {
+					directory: dir
+					filename:  "hello.sh"
+				}
+			}
+			output: run.export.files."/out.txt" & "Hello, world\n"
+		}
+
+		// Run a script from string
+		runString: {
+			run: bash.#Run & {
+				input: _image
+				export: files: "/output.txt": _
+				script: contents: "echo 'Hello, inlined world!' > /output.txt"
+			}
+			output: run.export.files."/output.txt" & "Hello, inlined world!\n"
+		}
+
+	}
+}