Implement exec.

Change-Id: I20329bc9b378479d745b498d6a00eca0872cd5ab
diff --git a/init/init_parser_test.cpp b/init/init_parser_test.cpp
new file mode 100644
index 0000000..170a73a
--- /dev/null
+++ b/init/init_parser_test.cpp
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "init_parser.h"
+
+#include "init.h"
+#include "util.h"
+
+#include <errno.h>
+#include <gtest/gtest.h>
+
+TEST(init_parser, make_exec_oneshot_service_invalid_syntax) {
+    char* argv[10];
+    memset(argv, 0, sizeof(argv));
+
+    // Nothing.
+    ASSERT_EQ(nullptr, make_exec_oneshot_service(0, argv));
+
+    // No arguments to 'exec'.
+    argv[0] = const_cast<char*>("exec");
+    ASSERT_EQ(nullptr, make_exec_oneshot_service(1, argv));
+
+    // No command in "exec --".
+    argv[1] = const_cast<char*>("--");
+    ASSERT_EQ(nullptr, make_exec_oneshot_service(2, argv));
+}
+
+TEST(init_parser, make_exec_oneshot_service_too_many_supplementary_gids) {
+    int argc = 0;
+    char* argv[4 + NR_SVC_SUPP_GIDS + 3];
+    argv[argc++] = const_cast<char*>("exec");
+    argv[argc++] = const_cast<char*>("seclabel");
+    argv[argc++] = const_cast<char*>("root"); // uid.
+    argv[argc++] = const_cast<char*>("root"); // gid.
+    for (int i = 0; i < NR_SVC_SUPP_GIDS; ++i) {
+        argv[argc++] = const_cast<char*>("root"); // Supplementary gid.
+    }
+    argv[argc++] = const_cast<char*>("--");
+    argv[argc++] = const_cast<char*>("/system/bin/id");
+    argv[argc] = nullptr;
+    ASSERT_EQ(nullptr, make_exec_oneshot_service(argc, argv));
+}
+
+static void Test_make_exec_oneshot_service(bool dash_dash, bool seclabel, bool uid, bool gid, bool supplementary_gids) {
+    int argc = 0;
+    char* argv[10];
+    argv[argc++] = const_cast<char*>("exec");
+    if (seclabel) {
+        argv[argc++] = const_cast<char*>("u:r:su:s0"); // seclabel
+        if (uid) {
+            argv[argc++] = const_cast<char*>("log");      // uid
+            if (gid) {
+                argv[argc++] = const_cast<char*>("shell");     // gid
+                if (supplementary_gids) {
+                    argv[argc++] = const_cast<char*>("system");    // supplementary gid 0
+                    argv[argc++] = const_cast<char*>("adb");       // supplementary gid 1
+                }
+            }
+        }
+    }
+    if (dash_dash) {
+        argv[argc++] = const_cast<char*>("--");
+    }
+    argv[argc++] = const_cast<char*>("/system/bin/toybox");
+    argv[argc++] = const_cast<char*>("id");
+    argv[argc] = nullptr;
+    service* svc = make_exec_oneshot_service(argc, argv);
+    ASSERT_NE(nullptr, svc);
+
+    if (seclabel) {
+        ASSERT_STREQ("u:r:su:s0", svc->seclabel);
+    } else {
+        ASSERT_EQ(nullptr, svc->seclabel);
+    }
+    if (uid) {
+        ASSERT_EQ(decode_uid("log"), svc->uid);
+    } else {
+        ASSERT_EQ(0U, svc->uid);
+    }
+    if (gid) {
+        ASSERT_EQ(decode_uid("shell"), svc->gid);
+    } else {
+        ASSERT_EQ(0U, svc->gid);
+    }
+    if (supplementary_gids) {
+        ASSERT_EQ(2U, svc->nr_supp_gids);
+        ASSERT_EQ(decode_uid("system"), svc->supp_gids[0]);
+        ASSERT_EQ(decode_uid("adb"), svc->supp_gids[1]);
+    } else {
+        ASSERT_EQ(0U, svc->nr_supp_gids);
+    }
+
+    ASSERT_EQ(2, svc->nargs);
+    ASSERT_EQ("/system/bin/toybox", svc->args[0]);
+    ASSERT_EQ("id", svc->args[1]);
+    ASSERT_EQ(nullptr, svc->args[2]);
+}
+
+TEST(init_parser, make_exec_oneshot_service_with_everything) {
+    Test_make_exec_oneshot_service(true, true, true, true, true);
+}
+
+TEST(init_parser, make_exec_oneshot_service_with_seclabel_uid_gid) {
+    Test_make_exec_oneshot_service(true, true, true, true, false);
+}
+
+TEST(init_parser, make_exec_oneshot_service_with_seclabel_uid) {
+    Test_make_exec_oneshot_service(true, true, true, false, false);
+}
+
+TEST(init_parser, make_exec_oneshot_service_with_seclabel) {
+    Test_make_exec_oneshot_service(true, true, false, false, false);
+}
+
+TEST(init_parser, make_exec_oneshot_service_with_just_command) {
+    Test_make_exec_oneshot_service(true, false, false, false, false);
+}
+
+TEST(init_parser, make_exec_oneshot_service_with_just_command_no_dash) {
+    Test_make_exec_oneshot_service(false, false, false, false, false);
+}