add file ops

Signed-off-by: Tony Worm <tony@hofstadter.io>

stdlib/file/file.cue

@@ -0,0 +1,72 @@
+package file
+
+import (
+	"strings"
+	"dagger.io/dagger"
+)
+
+#Create: {
+	filename: !=""
+  permissions: int | *0o644
+	contents: string | bytes
+
+	#compute: [
+		dagger.#WriteFile & { dest: filename, content: contents, mode: permissions}
+	]
+}
+
+#Append: {
+	filename: !=""
+  permissions: int | *0o644
+	contents: string | bytes
+	from: dagger.#Artifact
+
+	orig: (#read & { path: filename, "from": from }).data
+
+	#compute: [
+		dagger.#WriteFile & { dest: filename, content: "\(orig)\(contents)", mode: permissions}
+	]
+}
+
+#Read: {
+	filename: !=""
+	from: dagger.#Artifact
+	contents: (#read & { path: filename, "from": from }).data
+}
+
+#read: {
+	path: !=""
+	from: dagger.#Artifact
+	data: {
+		string
+		#compute: [
+			dagger.#Load & {"from": from},
+			dagger.#Export & { source: path }
+		]
+	}
+}
+
+#Glob: {
+	glob: !=""
+	filenames: [...string]
+	from: dagger.#Artifact
+	files: (_#glob & { "glob": glob, "from": from }).data
+	// trim suffix because ls always ends with newline
+	filenames: strings.Split(strings.TrimSuffix(files, "\n"), "\n")
+}
+
+_#glob: {
+	glob: !=""
+	from: dagger.#Artifact
+	data: {
+		string
+		_tmppath: "/tmp/ls.out"
+		#compute: [
+			dagger.#Load & {"from": from},
+			dagger.#Exec & {
+				args: ["sh", "-c", "ls \(glob) > \(_tmppath)"]
+			},
+			dagger.#Export & { source: _tmppath }
+		]
+	}
+}

tests/stdlib/file/file.cue

@@ -0,0 +1,131 @@
+package f
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/alpine"
+	"dagger.io/file"
+)
+
+TestCreate: {
+	_content: "hello world"
+
+	write: file.#Create & {
+		filename: "/file.txt"
+		contents: _content
+	}
+
+	test: #compute: [
+		dagger.#Load & {from: alpine.#Image},
+		dagger.#Exec & {
+			args: [
+				"sh",
+				"-ec",
+				"""
+				test "$(cat /file.txt)" = "hello world"
+				""",
+			]
+			mount: "/file.txt": {
+				from: write
+				path: "/file.txt"
+			}
+		},
+	]
+}
+
+TestRead: {
+	read: file.#Read & {
+		filename: "/etc/alpine-release"
+		from: alpine.#Image & { version: "3.10.6" }
+	}
+	test: #compute: [
+		dagger.#Load & {from: alpine.#Image},
+		dagger.#Exec & {
+			args: [
+				"sh",
+				"-ec",
+				"""
+				test "\(read.contents)" = "3.10.6\n"
+				""",
+			]
+		},
+	]
+}
+
+TestRead2: {
+	write: file.#Create & {
+		_content: "hello world"
+		filename: "/file.txt"
+		contents: _content
+	}
+
+	read: file.#Read & {
+		filename: "/file.txt"
+		from: write
+	}
+
+	test: #compute: [
+		dagger.#Load & {from: alpine.#Image},
+		dagger.#Exec & {
+			args: [
+				"sh",
+				"-ec",
+				"""
+				test "\(read.contents)" = "hello world"
+				""",
+			]
+		},
+	]
+}
+
+TestAppend: {
+	content1: "hello world"
+	content2: "foo bar"
+
+	write: file.#Create & {
+		filename: "/file.txt"
+		contents: content1
+	}
+	append: file.#Append & {
+		filename: "/file.txt"
+		contents: content2
+		from: write
+	}
+
+	orig: append.orig
+
+	read: file.#Read & {
+		filename: "/file.txt"
+		from: append
+	}
+
+	new: read.contents
+
+	test: new & "hello worldfoo bar"
+
+	//test: #compute: [
+		//dagger.#Load & {from: alpine.#Image},
+		//dagger.#Exec & {
+			//args: [
+				//"sh",
+				//"-ec",
+				//"""
+				//test "$(cat /file.txt)" = "hello worldfoo bar"
+				//""",
+			//]
+			//mount: "/file.txt": {
+				//from: append
+				//path: "/file.txt"
+			//}
+		//},
+	//]
+}
+
+TestGlob: {
+	list: file.#Glob & {
+		glob: "/etc/r*"
+		from: alpine.#Image
+	}
+	test: list.filenames & ["/etc/resolv.conf"]
+}
+
+

tests/test.sh

@@ -27,6 +27,8 @@ test::stdlib() {
       "$dagger" "${DAGGER_BINARY_ARGS[@]}" compute "$d"/stdlib/yarn --input-dir TestData="$d"/stdlib/yarn/testdata
   test::one "stdlib: go" \
       "$dagger" "${DAGGER_BINARY_ARGS[@]}" compute "$d"/stdlib/go --input-dir TestData="$d"/stdlib/go/testdata
+  test::one "stdlib: file" \
+      "$dagger" "${DAGGER_BINARY_ARGS[@]}" compute "$d"/stdlib/file
 }
 
 test::compute(){