readpassword: bubble up errors instead of exiting the process

This allows cleanups to happen in the caller, like removing
the control socket.

Fixes https://github.com/rfjakob/gocryptfs/issues/634

1 files changed, 25 insertions, 51 deletions

diff --git a/internal/readpassword/passfile_test.go b/internal/readpassword/passfile_test.go
index dbfe159..425e4e5 100644
--- a/internal/readpassword/passfile_test.go
+++ b/internal/readpassword/passfile_test.go
@@ -1,8 +1,6 @@
 package readpassword
 
 import (
-	"os"
-	"os/exec"
 	"testing"
 )
 
@@ -17,76 +15,49 @@ func TestPassfile(t *testing.T) {
 		{"file with spaces.txt", "mypassword"},
 	}
 	for _, tc := range testcases {
-		pw := readPassFile("passfile_test_files/" + tc.file)
+		pw, err := readPassFile("passfile_test_files/" + tc.file)
+		if err != nil {
+			t.Fatal(err)
+		}
 		if string(pw) != tc.want {
 			t.Errorf("Wrong result: want=%q have=%q", tc.want, pw)
 		}
 		// Calling readPassFileConcatenate with only one element should give the
 		// same result
-		pw = readPassFileConcatenate([]string{"passfile_test_files/" + tc.file})
+		pw, err = readPassFileConcatenate([]string{"passfile_test_files/" + tc.file})
+		if err != nil {
+			t.Fatal(err)
+		}
 		if string(pw) != tc.want {
 			t.Errorf("Wrong result: want=%q have=%q", tc.want, pw)
 		}
 	}
 }
 
-// readPassFile() should exit instead of returning an empty string.
-//
-// The TEST_SLAVE magic is explained at
-// https://talks.golang.org/2014/testing.slide#23 , mirror:
-// http://web.archive.org/web/20200426174352/https://talks.golang.org/2014/testing.slide#23
+// readPassFile() should fail instead of returning an empty string.
 func TestPassfileEmpty(t *testing.T) {
-	if os.Getenv("TEST_SLAVE") == "1" {
-		readPassFile("passfile_test_files/empty.txt")
-		return
+	_, err := readPassFile("passfile_test_files/empty.txt")
+	if err == nil {
+		t.Fatal("should have failed")
 	}
-	cmd := exec.Command(os.Args[0], "-test.run=TestPassfileEmpty$")
-	cmd.Env = append(os.Environ(), "TEST_SLAVE=1")
-	err := cmd.Run()
-	if err != nil {
-		return
-	}
-	t.Fatal("should have exited")
 }
 
 // File containing just a newline.
-// readPassFile() should exit instead of returning an empty string.
-//
-// The TEST_SLAVE magic is explained at
-// https://talks.golang.org/2014/testing.slide#23 , mirror:
-// http://web.archive.org/web/20200426174352/https://talks.golang.org/2014/testing.slide#23
+// readPassFile() should fal instead of returning an empty string.
 func TestPassfileNewline(t *testing.T) {
-	if os.Getenv("TEST_SLAVE") == "1" {
-		readPassFile("passfile_test_files/newline.txt")
-		return
-	}
-	cmd := exec.Command(os.Args[0], "-test.run=TestPassfileNewline$")
-	cmd.Env = append(os.Environ(), "TEST_SLAVE=1")
-	err := cmd.Run()
-	if err != nil {
-		return
+	_, err := readPassFile("passfile_test_files/newline.txt")
+	if err == nil {
+		t.Fatal("should have failed")
 	}
-	t.Fatal("should have exited")
 }
 
 // File containing "\ngarbage".
-// readPassFile() should exit instead of returning an empty string.
-//
-// The TEST_SLAVE magic is explained at
-// https://talks.golang.org/2014/testing.slide#23 , mirror:
-// http://web.archive.org/web/20200426174352/https://talks.golang.org/2014/testing.slide#23
+// readPassFile() should return an error.
 func TestPassfileEmptyFirstLine(t *testing.T) {
-	if os.Getenv("TEST_SLAVE") == "1" {
-		readPassFile("passfile_test_files/empty_first_line.txt")
-		return
-	}
-	cmd := exec.Command(os.Args[0], "-test.run=TestPassfileEmptyFirstLine$")
-	cmd.Env = append(os.Environ(), "TEST_SLAVE=1")
-	err := cmd.Run()
-	if err != nil {
-		return
+	_, err := readPassFile("passfile_test_files/empty_first_line.txt")
+	if err == nil {
+		t.Fatal("should have failed")
 	}
-	t.Fatal("should have exited")
 }
 
 // TestPassFileConcatenate tests readPassFileConcatenate
@@ -95,8 +66,11 @@ func TestPassFileConcatenate(t *testing.T) {
 		"passfile_test_files/file with spaces.txt",
 		"passfile_test_files/mypassword_garbage.txt",
 	}
-	res := string(readPassFileConcatenate(files))
-	if res != "mypasswordmypassword" {
+	res, err := readPassFileConcatenate(files)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(res) != "mypasswordmypassword" {
 		t.Errorf("wrong result: %q", res)
 	}
 }