diff --git a/Android.mk b/Android.mk
index 2992f06..819ad5a 100644
--- a/Android.mk
+++ b/Android.mk
@@ -156,10 +156,6 @@
 
 LOCAL_CFLAGS := $(recovery_common_cflags)
 
-ifeq ($(AB_OTA_UPDATER),true)
-    LOCAL_CFLAGS += -DAB_OTA_UPDATER=1
-endif
-
 LOCAL_MODULE := librecovery
 
 LOCAL_STATIC_LIBRARIES := \
diff --git a/install.cpp b/install.cpp
index a4c6986..800847f 100644
--- a/install.cpp
+++ b/install.cpp
@@ -45,6 +45,7 @@
 #include <android-base/properties.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
+#include <android-base/unique_fd.h>
 #include <vintf/VintfObjectRecovery.h>
 #include <ziparchive/zip_archive.h>
 
@@ -124,11 +125,9 @@
   }
 }
 
-#ifdef AB_OTA_UPDATER
-
-// Parses the metadata of the OTA package in |zip| and checks whether we are
-// allowed to accept this A/B package. Downgrading is not allowed unless
-// explicitly enabled in the package and only for incremental packages.
+// Parses the metadata of the OTA package in |zip| and checks whether we are allowed to accept this
+// A/B package. Downgrading is not allowed unless explicitly enabled in the package and only for
+// incremental packages.
 static int check_newer_ab_build(ZipArchiveHandle zip) {
   std::string metadata_str;
   if (!read_metadata_from_package(zip, &metadata_str)) {
@@ -214,8 +213,7 @@
   return 0;
 }
 
-int update_binary_command(const std::string& package, ZipArchiveHandle zip,
-                          const std::string& binary_path, int /* retry_count */, int status_fd,
+int SetUpAbUpdateCommands(const std::string& package, ZipArchiveHandle zip, int status_fd,
                           std::vector<std::string>* cmd) {
   CHECK(cmd != nullptr);
   int ret = check_newer_ab_build(zip);
@@ -250,7 +248,7 @@
   }
   long payload_offset = payload_entry.offset;
   *cmd = {
-    binary_path,
+    "/sbin/update_engine_sideload",
     "--payload=file://" + package,
     android::base::StringPrintf("--offset=%ld", payload_offset),
     "--headers=" + std::string(payload_properties.begin(), payload_properties.end()),
@@ -259,14 +257,11 @@
   return 0;
 }
 
-#else  // !AB_OTA_UPDATER
-
-int update_binary_command(const std::string& package, ZipArchiveHandle zip,
-                          const std::string& binary_path, int retry_count, int status_fd,
-                          std::vector<std::string>* cmd) {
+int SetUpNonAbUpdateCommands(const std::string& package, ZipArchiveHandle zip, int retry_count,
+                             int status_fd, std::vector<std::string>* cmd) {
   CHECK(cmd != nullptr);
 
-  // On traditional updates we extract the update binary from the package.
+  // In non-A/B updates we extract the update binary from the package.
   static constexpr const char* UPDATE_BINARY_NAME = "META-INF/com/google/android/update-binary";
   ZipString binary_name(UPDATE_BINARY_NAME);
   ZipEntry binary_entry;
@@ -275,15 +270,16 @@
     return INSTALL_CORRUPT;
   }
 
+  const std::string binary_path = Paths::Get().temporary_update_binary();
   unlink(binary_path.c_str());
-  int fd = open(binary_path.c_str(), O_CREAT | O_WRONLY | O_TRUNC | O_CLOEXEC, 0755);
+  android::base::unique_fd fd(
+      open(binary_path.c_str(), O_CREAT | O_WRONLY | O_TRUNC | O_CLOEXEC, 0755));
   if (fd == -1) {
     PLOG(ERROR) << "Failed to create " << binary_path;
     return INSTALL_ERROR;
   }
 
   int32_t error = ExtractEntryToFile(zip, &binary_entry, fd);
-  close(fd);
   if (error != 0) {
     LOG(ERROR) << "Failed to extract " << UPDATE_BINARY_NAME << ": " << ErrorCodeString(error);
     return INSTALL_ERROR;
@@ -300,7 +296,6 @@
   }
   return 0;
 }
-#endif  // !AB_OTA_UPDATER
 
 static void log_max_temperature(int* max_temperature, const std::atomic<bool>& logger_finished) {
   CHECK(max_temperature != nullptr);
@@ -321,14 +316,10 @@
   int pipefd[2];
   pipe(pipefd);
 
+  bool is_ab = android::base::GetBoolProperty("ro.build.ab_update", false);
   std::vector<std::string> args;
-#ifdef AB_OTA_UPDATER
-  int ret = update_binary_command(package, zip, "/sbin/update_engine_sideload", retry_count,
-                                  pipefd[1], &args);
-#else
-  int ret = update_binary_command(package, zip, "/tmp/update-binary", retry_count, pipefd[1],
-                                  &args);
-#endif
+  int ret = is_ab ? SetUpAbUpdateCommands(package, zip, pipefd[1], &args)
+                  : SetUpNonAbUpdateCommands(package, zip, retry_count, pipefd[1], &args);
   if (ret) {
     close(pipefd[0]);
     close(pipefd[1]);
diff --git a/otautil/include/otautil/paths.h b/otautil/include/otautil/paths.h
index 39088f1..f95741a 100644
--- a/otautil/include/otautil/paths.h
+++ b/otautil/include/otautil/paths.h
@@ -76,6 +76,13 @@
     temporary_log_file_ = log_file;
   }
 
+  std::string temporary_update_binary() const {
+    return temporary_update_binary_;
+  }
+  void set_temporary_update_binary(const std::string& update_binary) {
+    temporary_update_binary_ = update_binary;
+  }
+
  private:
   Paths();
   DISALLOW_COPY_AND_ASSIGN(Paths);
@@ -103,6 +110,9 @@
 
   // Path to the temporary log file while under recovery.
   std::string temporary_log_file_;
+
+  // Path to the temporary update binary while installing a non-A/B package.
+  std::string temporary_update_binary_;
 };
 
 #endif  // _OTAUTIL_PATHS_H_
diff --git a/otautil/paths.cpp b/otautil/paths.cpp
index f08e51c..33ab4a5 100644
--- a/otautil/paths.cpp
+++ b/otautil/paths.cpp
@@ -23,6 +23,7 @@
 constexpr const char kDefaultStashDirectoryBase[] = "/cache/recovery";
 constexpr const char kDefaultTemporaryInstallFile[] = "/tmp/last_install";
 constexpr const char kDefaultTemporaryLogFile[] = "/tmp/recovery.log";
+constexpr const char kDefaultTemporaryUpdateBinary[] = "/tmp/update-binary";
 
 Paths& Paths::Get() {
   static Paths paths;
@@ -36,4 +37,5 @@
       resource_dir_(kDefaultResourceDirectory),
       stash_directory_base_(kDefaultStashDirectoryBase),
       temporary_install_file_(kDefaultTemporaryInstallFile),
-      temporary_log_file_(kDefaultTemporaryLogFile) {}
+      temporary_log_file_(kDefaultTemporaryLogFile),
+      temporary_update_binary_(kDefaultTemporaryUpdateBinary) {}
diff --git a/private/install.h b/private/install.h
index ef64bd4..7fdc741 100644
--- a/private/install.h
+++ b/private/install.h
@@ -23,9 +23,17 @@
 
 #include <ziparchive/zip_archive.h>
 
-// Extract the update binary from the open zip archive |zip| located at |package| to |binary_path|.
-// Store the command line that should be called into |cmd|. The |status_fd| is the file descriptor
-// the child process should use to report back the progress of the update.
-int update_binary_command(const std::string& package, ZipArchiveHandle zip,
-                          const std::string& binary_path, int retry_count, int status_fd,
+// Sets up the commands for a non-A/B update. Extracts the updater binary from the open zip archive
+// |zip| located at |package|. Stores the command line that should be called into |cmd|. The
+// |status_fd| is the file descriptor the child process should use to report back the progress of
+// the update.
+int SetUpNonAbUpdateCommands(const std::string& package, ZipArchiveHandle zip, int retry_count,
+                             int status_fd, std::vector<std::string>* cmd);
+
+// Sets up the commands for an A/B update. Extracts the needed entries from the open zip archive
+// |zip| located at |package|. Stores the command line that should be called into |cmd|. The
+// |status_fd| is the file descriptor the child process should use to report back the progress of
+// the update. Note that since this applies to the sideloading flow only, it takes one less
+// parameter |retry_count| than the non-A/B version.
+int SetUpAbUpdateCommands(const std::string& package, ZipArchiveHandle zip, int status_fd,
                           std::vector<std::string>* cmd);
diff --git a/tests/Android.mk b/tests/Android.mk
index cee94dc..d402397 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -72,10 +72,6 @@
     -Werror \
     -D_FILE_OFFSET_BITS=64
 
-ifeq ($(AB_OTA_UPDATER),true)
-LOCAL_CFLAGS += -DAB_OTA_UPDATER=1
-endif
-
 LOCAL_MODULE := recovery_component_test
 LOCAL_COMPATIBILITY_SUITE := device-tests
 LOCAL_C_INCLUDES := bootable/recovery
diff --git a/tests/component/install_test.cpp b/tests/component/install_test.cpp
index d19d788..b9af0b1 100644
--- a/tests/component/install_test.cpp
+++ b/tests/component/install_test.cpp
@@ -33,6 +33,7 @@
 #include <ziparchive/zip_writer.h>
 
 #include "install.h"
+#include "otautil/paths.h"
 #include "private/install.h"
 
 TEST(InstallTest, verify_package_compatibility_no_entry) {
@@ -199,8 +200,73 @@
   CloseArchive(zip);
 }
 
-#ifdef AB_OTA_UPDATER
-static void VerifyAbUpdateBinaryCommand(const std::string& serialno, bool success = true) {
+TEST(InstallTest, SetUpNonAbUpdateCommands) {
+  TemporaryFile temp_file;
+  FILE* zip_file = fdopen(temp_file.release(), "w");
+  ZipWriter writer(zip_file);
+  static constexpr const char* UPDATE_BINARY_NAME = "META-INF/com/google/android/update-binary";
+  ASSERT_EQ(0, writer.StartEntry(UPDATE_BINARY_NAME, kCompressStored));
+  ASSERT_EQ(0, writer.FinishEntry());
+  ASSERT_EQ(0, writer.Finish());
+  ASSERT_EQ(0, fclose(zip_file));
+
+  ZipArchiveHandle zip;
+  ASSERT_EQ(0, OpenArchive(temp_file.path, &zip));
+  int status_fd = 10;
+  std::string package = "/path/to/update.zip";
+  TemporaryDir td;
+  std::string binary_path = std::string(td.path) + "/update_binary";
+  Paths::Get().set_temporary_update_binary(binary_path);
+  std::vector<std::string> cmd;
+  ASSERT_EQ(0, SetUpNonAbUpdateCommands(package, zip, 0, status_fd, &cmd));
+  ASSERT_EQ(4U, cmd.size());
+  ASSERT_EQ(binary_path, cmd[0]);
+  ASSERT_EQ("3", cmd[1]);  // RECOVERY_API_VERSION
+  ASSERT_EQ(std::to_string(status_fd), cmd[2]);
+  ASSERT_EQ(package, cmd[3]);
+  struct stat sb;
+  ASSERT_EQ(0, stat(binary_path.c_str(), &sb));
+  ASSERT_EQ(static_cast<mode_t>(0755), sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO));
+
+  // With non-zero retry count. update_binary will be removed automatically.
+  cmd.clear();
+  ASSERT_EQ(0, SetUpNonAbUpdateCommands(package, zip, 2, status_fd, &cmd));
+  ASSERT_EQ(5U, cmd.size());
+  ASSERT_EQ(binary_path, cmd[0]);
+  ASSERT_EQ("3", cmd[1]);  // RECOVERY_API_VERSION
+  ASSERT_EQ(std::to_string(status_fd), cmd[2]);
+  ASSERT_EQ(package, cmd[3]);
+  ASSERT_EQ("retry", cmd[4]);
+  sb = {};
+  ASSERT_EQ(0, stat(binary_path.c_str(), &sb));
+  ASSERT_EQ(static_cast<mode_t>(0755), sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO));
+
+  CloseArchive(zip);
+}
+
+TEST(InstallTest, SetUpNonAbUpdateCommands_MissingUpdateBinary) {
+  TemporaryFile temp_file;
+  FILE* zip_file = fdopen(temp_file.release(), "w");
+  ZipWriter writer(zip_file);
+  // The archive must have something to be opened correctly.
+  ASSERT_EQ(0, writer.StartEntry("dummy_entry", 0));
+  ASSERT_EQ(0, writer.FinishEntry());
+  ASSERT_EQ(0, writer.Finish());
+  ASSERT_EQ(0, fclose(zip_file));
+
+  // Missing update binary.
+  ZipArchiveHandle zip;
+  ASSERT_EQ(0, OpenArchive(temp_file.path, &zip));
+  int status_fd = 10;
+  std::string package = "/path/to/update.zip";
+  TemporaryDir td;
+  Paths::Get().set_temporary_update_binary(std::string(td.path) + "/update_binary");
+  std::vector<std::string> cmd;
+  ASSERT_EQ(INSTALL_CORRUPT, SetUpNonAbUpdateCommands(package, zip, 0, status_fd, &cmd));
+  CloseArchive(zip);
+}
+
+static void VerifyAbUpdateCommands(const std::string& serialno, bool success = true) {
   TemporaryFile temp_file;
   FILE* zip_file = fdopen(temp_file.release(), "w");
   ZipWriter writer(zip_file);
@@ -235,73 +301,27 @@
   ASSERT_EQ(0, FindEntry(zip, payload_name, &payload_entry));
   int status_fd = 10;
   std::string package = "/path/to/update.zip";
-  std::string binary_path = "/sbin/update_engine_sideload";
   std::vector<std::string> cmd;
   if (success) {
-    ASSERT_EQ(0, update_binary_command(package, zip, binary_path, 0, status_fd, &cmd));
+    ASSERT_EQ(0, SetUpAbUpdateCommands(package, zip, status_fd, &cmd));
     ASSERT_EQ(5U, cmd.size());
-    ASSERT_EQ(binary_path, cmd[0]);
+    ASSERT_EQ("/sbin/update_engine_sideload", cmd[0]);
     ASSERT_EQ("--payload=file://" + package, cmd[1]);
     ASSERT_EQ("--offset=" + std::to_string(payload_entry.offset), cmd[2]);
     ASSERT_EQ("--headers=" + properties, cmd[3]);
     ASSERT_EQ("--status_fd=" + std::to_string(status_fd), cmd[4]);
   } else {
-    ASSERT_EQ(INSTALL_ERROR, update_binary_command(package, zip, binary_path, 0, status_fd, &cmd));
+    ASSERT_EQ(INSTALL_ERROR, SetUpAbUpdateCommands(package, zip, status_fd, &cmd));
   }
   CloseArchive(zip);
 }
-#endif  // AB_OTA_UPDATER
 
-TEST(InstallTest, update_binary_command_smoke) {
-#ifdef AB_OTA_UPDATER
+TEST(InstallTest, SetUpAbUpdateCommands) {
   // Empty serialno will pass the verification.
-  VerifyAbUpdateBinaryCommand({});
-#else
-  TemporaryFile temp_file;
-  FILE* zip_file = fdopen(temp_file.release(), "w");
-  ZipWriter writer(zip_file);
-  static constexpr const char* UPDATE_BINARY_NAME = "META-INF/com/google/android/update-binary";
-  ASSERT_EQ(0, writer.StartEntry(UPDATE_BINARY_NAME, kCompressStored));
-  ASSERT_EQ(0, writer.FinishEntry());
-  ASSERT_EQ(0, writer.Finish());
-  ASSERT_EQ(0, fclose(zip_file));
-
-  ZipArchiveHandle zip;
-  ASSERT_EQ(0, OpenArchive(temp_file.path, &zip));
-  int status_fd = 10;
-  std::string package = "/path/to/update.zip";
-  TemporaryDir td;
-  std::string binary_path = std::string(td.path) + "/update_binary";
-  std::vector<std::string> cmd;
-  ASSERT_EQ(0, update_binary_command(package, zip, binary_path, 0, status_fd, &cmd));
-  ASSERT_EQ(4U, cmd.size());
-  ASSERT_EQ(binary_path, cmd[0]);
-  ASSERT_EQ("3", cmd[1]);  // RECOVERY_API_VERSION
-  ASSERT_EQ(std::to_string(status_fd), cmd[2]);
-  ASSERT_EQ(package, cmd[3]);
-  struct stat sb;
-  ASSERT_EQ(0, stat(binary_path.c_str(), &sb));
-  ASSERT_EQ(static_cast<mode_t>(0755), sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO));
-
-  // With non-zero retry count. update_binary will be removed automatically.
-  cmd.clear();
-  ASSERT_EQ(0, update_binary_command(package, zip, binary_path, 2, status_fd, &cmd));
-  ASSERT_EQ(5U, cmd.size());
-  ASSERT_EQ(binary_path, cmd[0]);
-  ASSERT_EQ("3", cmd[1]);  // RECOVERY_API_VERSION
-  ASSERT_EQ(std::to_string(status_fd), cmd[2]);
-  ASSERT_EQ(package, cmd[3]);
-  ASSERT_EQ("retry", cmd[4]);
-  sb = {};
-  ASSERT_EQ(0, stat(binary_path.c_str(), &sb));
-  ASSERT_EQ(static_cast<mode_t>(0755), sb.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO));
-
-  CloseArchive(zip);
-#endif  // AB_OTA_UPDATER
+  VerifyAbUpdateCommands({});
 }
 
-TEST(InstallTest, update_binary_command_invalid) {
-#ifdef AB_OTA_UPDATER
+TEST(InstallTest, SetUpAbUpdateCommands_MissingPayloadPropertiesTxt) {
   TemporaryFile temp_file;
   FILE* zip_file = fdopen(temp_file.release(), "w");
   ZipWriter writer(zip_file);
@@ -328,60 +348,36 @@
   ASSERT_EQ(0, OpenArchive(temp_file.path, &zip));
   int status_fd = 10;
   std::string package = "/path/to/update.zip";
-  std::string binary_path = "/sbin/update_engine_sideload";
   std::vector<std::string> cmd;
-  ASSERT_EQ(INSTALL_CORRUPT, update_binary_command(package, zip, binary_path, 0, status_fd, &cmd));
+  ASSERT_EQ(INSTALL_CORRUPT, SetUpAbUpdateCommands(package, zip, status_fd, &cmd));
   CloseArchive(zip);
-#else
-  TemporaryFile temp_file;
-  FILE* zip_file = fdopen(temp_file.release(), "w");
-  ZipWriter writer(zip_file);
-  // The archive must have something to be opened correctly.
-  ASSERT_EQ(0, writer.StartEntry("dummy_entry", 0));
-  ASSERT_EQ(0, writer.FinishEntry());
-  ASSERT_EQ(0, writer.Finish());
-  ASSERT_EQ(0, fclose(zip_file));
-
-  // Missing update binary.
-  ZipArchiveHandle zip;
-  ASSERT_EQ(0, OpenArchive(temp_file.path, &zip));
-  int status_fd = 10;
-  std::string package = "/path/to/update.zip";
-  TemporaryDir td;
-  std::string binary_path = std::string(td.path) + "/update_binary";
-  std::vector<std::string> cmd;
-  ASSERT_EQ(INSTALL_CORRUPT, update_binary_command(package, zip, binary_path, 0, status_fd, &cmd));
-  CloseArchive(zip);
-#endif  // AB_OTA_UPDATER
 }
 
-#ifdef AB_OTA_UPDATER
-TEST(InstallTest, update_binary_command_multiple_serialno) {
+TEST(InstallTest, SetUpAbUpdateCommands_MultipleSerialnos) {
   std::string serialno = android::base::GetProperty("ro.serialno", "");
   ASSERT_NE("", serialno);
 
   // Single matching serialno will pass the verification.
-  VerifyAbUpdateBinaryCommand(serialno);
+  VerifyAbUpdateCommands(serialno);
 
   static constexpr char alphabet[] =
       "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
   auto generator = []() { return alphabet[rand() % (sizeof(alphabet) - 1)]; };
 
   // Generate 900 random serial numbers.
-  std::string random_serial;
+  std::string random_serialno;
   for (size_t i = 0; i < 900; i++) {
-    generate_n(back_inserter(random_serial), serialno.size(), generator);
-    random_serial.append("|");
+    generate_n(back_inserter(random_serialno), serialno.size(), generator);
+    random_serialno.append("|");
   }
   // Random serialnos should fail the verification.
-  VerifyAbUpdateBinaryCommand(random_serial, false);
+  VerifyAbUpdateCommands(random_serialno, false);
 
-  std::string long_serial = random_serial + serialno + "|";
+  std::string long_serialno = random_serialno + serialno + "|";
   for (size_t i = 0; i < 99; i++) {
-    generate_n(back_inserter(long_serial), serialno.size(), generator);
-    long_serial.append("|");
+    generate_n(back_inserter(long_serialno), serialno.size(), generator);
+    long_serialno.append("|");
   }
   // String with the matching serialno should pass the verification.
-  VerifyAbUpdateBinaryCommand(long_serial);
+  VerifyAbUpdateCommands(long_serialno);
 }
-#endif  // AB_OTA_UPDATER