bsdtar: test passphrase for appended archives

Exercise --passphrase while copying entries from an encrypted
@archive into a new archive, then extract the result and verify the
copied file contents.

tar/test/test_option_passphrase.c

@@ -21,4 +21,23 @@ DEFINE_TEST(test_option_passphrase)
 	assertTextFileContents("contents of file2.\n", "file2");
 	assertEmptyFile("test.out");
 	assertEmptyFile("test.err");
+
+	/* The passphrase must also be applied to archives read via @archive. */
+	failure("--passphrase option is broken with @archive");
+	assertEqualInt(0, systemf(
+	    "%s --passphrase pass1 -cf append.tar @%s "
+	    ">append-create.out 2>append-create.err",
+	    testprog, reffile));
+	assertEmptyFile("append-create.out");
+	assertEmptyFile("append-create.err");
+
+	assertMakeDir("append", 0755);
+	assertEqualInt(0, systemf(
+	    "%s -xf append.tar -C append "
+	    ">append-extract.out 2>append-extract.err",
+	    testprog));
+	assertTextFileContents("contents of file1.\n", "append/file1");
+	assertTextFileContents("contents of file2.\n", "append/file2");
+	assertEmptyFile("append-extract.out");
+	assertEmptyFile("append-extract.err");
 }