readpassword: create internal package for password reading

* Supports stdin
* Add tests for extpass and stdin

As per user request at https://github.com/rfjakob/gocryptfs/issues/30

1 files changed, 100 insertions, 0 deletions

diff --git a/internal/readpassword/stdin_test.go b/internal/readpassword/stdin_test.go
new file mode 100644
index 0000000..2d9f93f
--- /dev/null
+++ b/internal/readpassword/stdin_test.go
@@ -0,0 +1,100 @@
+package readpassword
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"testing"
+)
+
+// Provide password via stdin, terminated by "\n".
+func TestStdin(t *testing.T) {
+	p1 := "g55434t55wef"
+	if os.Getenv("TEST_SLAVE") == "1" {
+		p2 := readPasswordStdin()
+		if p1 != p2 {
+			fmt.Fprintf(os.Stderr, "%q != %q", p1, p2)
+			os.Exit(1)
+		}
+		return
+	}
+	cmd := exec.Command(os.Args[0], "-test.run=TestStdin$")
+	cmd.Env = append(os.Environ(), "TEST_SLAVE=1")
+	cmd.Stderr = os.Stderr
+	pipe, err := cmd.StdinPipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = cmd.Start()
+	if err != nil {
+		t.Fatal(err)
+	}
+	n, err := pipe.Write([]byte(p1 + "\n"))
+	if n == 0 || err != nil {
+		t.Fatal(err)
+	}
+	err = cmd.Wait()
+	if err != nil {
+		t.Fatalf("slave failed with %v", err)
+	}
+}
+
+// Provide password via stdin, terminated by EOF (pipe close). This should not
+// hang.
+func TestStdinEof(t *testing.T) {
+	p1 := "asd45as5f4a36"
+	if os.Getenv("TEST_SLAVE") == "1" {
+		p2 := readPasswordStdin()
+		if p1 != p2 {
+			fmt.Fprintf(os.Stderr, "%q != %q", p1, p2)
+			os.Exit(1)
+		}
+		return
+	}
+	cmd := exec.Command(os.Args[0], "-test.run=TestStdinEof$")
+	cmd.Env = append(os.Environ(), "TEST_SLAVE=1")
+	cmd.Stderr = os.Stderr
+	pipe, err := cmd.StdinPipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = cmd.Start()
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = pipe.Write([]byte(p1))
+	if err != nil {
+		t.Fatal(err)
+	}
+	pipe.Close()
+	err = cmd.Wait()
+	if err != nil {
+		t.Fatalf("slave failed with %v", err)
+	}
+}
+
+// Provide empty password via stdin
+func TestStdinEmpty(t *testing.T) {
+	if os.Getenv("TEST_SLAVE") == "1" {
+		readPasswordStdin()
+	}
+	cmd := exec.Command(os.Args[0], "-test.run=TestStdinEmpty$")
+	cmd.Env = append(os.Environ(), "TEST_SLAVE=1")
+	pipe, err := cmd.StdinPipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = cmd.Start()
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = pipe.Write([]byte("\n"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	pipe.Close()
+	err = cmd.Wait()
+	if err == nil {
+		t.Fatalf("empty password should have failed")
+	}
+}