Add misc_writer.
bootloader_message.h currently divides /misc into four segments. The
space between 2K and 16K is reserved for vendor use (e.g. bootloader
persists flags). This CL adds a vendor tool "misc_writer", to allow
writing data to the vendor space in /misc, before getting a dedicated
HAL for accessing /misc partition (b/131775112).
Targets need to explicitly include the module, then invoke the
executable to write data. For example, the following command will write
3-byte data ("0xABCDEF") to offset 4 in vendor space (i.e. 2048 + 4 in
/misc).
$ /vendor/bin/misc_writer --vendor-space-offset 4 --hex-string 0xABCDEF
Bug: 132906936
Test: Run recovery_unit_test on crosshatch.
Test: Call the command via init.hardware.rc on crosshatch. Check that
the call finishes successfully. Then check the contents written to
/misc (`dd bs=1 skip=2048 if=/dev/block/sda2 count=32 | xxd`).
Change-Id: I79548fc63fc79b705a0320868690569c3106949f
Merged-In: I79548fc63fc79b705a0320868690569c3106949f
(cherry picked from commit 7ae01698424cc3adf635c324961b1405594f5156)
diff --git a/tests/component/bootloader_message_test.cpp b/tests/component/bootloader_message_test.cpp
index b005d19..95d875e 100644
--- a/tests/component/bootloader_message_test.cpp
+++ b/tests/component/bootloader_message_test.cpp
@@ -15,6 +15,7 @@
*/
#include <string>
+#include <string_view>
#include <vector>
#include <android-base/file.h>
@@ -22,6 +23,10 @@
#include <bootloader_message/bootloader_message.h>
#include <gtest/gtest.h>
+using namespace std::string_literals;
+
+extern void SetMiscBlockDeviceForTest(std::string_view misc_device);
+
TEST(BootloaderMessageTest, read_and_write_bootloader_message) {
TemporaryFile temp_misc;
@@ -114,3 +119,36 @@
std::string(boot.reserved, sizeof(boot.reserved)));
}
+TEST(BootloaderMessageTest, WriteMiscPartitionVendorSpace) {
+ TemporaryFile temp_misc;
+ ASSERT_TRUE(android::base::WriteStringToFile(std::string(4096, '\x00'), temp_misc.path));
+ SetMiscBlockDeviceForTest(temp_misc.path);
+
+ constexpr std::string_view kTestMessage = "kTestMessage";
+ std::string err;
+ ASSERT_TRUE(WriteMiscPartitionVendorSpace(kTestMessage.data(), kTestMessage.size(), 0, &err));
+
+ std::string message;
+ message.resize(kTestMessage.size());
+ ASSERT_TRUE(ReadMiscPartitionVendorSpace(message.data(), message.size(), 0, &err));
+ ASSERT_EQ(kTestMessage, message);
+
+ // Write with an offset.
+ ASSERT_TRUE(WriteMiscPartitionVendorSpace("\x00\x00", 2, 5, &err));
+ ASSERT_TRUE(ReadMiscPartitionVendorSpace(message.data(), message.size(), 0, &err));
+ ASSERT_EQ("kTest\x00\x00ssage"s, message);
+
+ // Write with the right size.
+ auto start_offset =
+ WIPE_PACKAGE_OFFSET_IN_MISC - VENDOR_SPACE_OFFSET_IN_MISC - kTestMessage.size();
+ ASSERT_TRUE(
+ WriteMiscPartitionVendorSpace(kTestMessage.data(), kTestMessage.size(), start_offset, &err));
+
+ // Out-of-bound write.
+ ASSERT_FALSE(WriteMiscPartitionVendorSpace(kTestMessage.data(), kTestMessage.size(),
+ start_offset + 1, &err));
+
+ // Message won't fit.
+ std::string long_message(WIPE_PACKAGE_OFFSET_IN_MISC - VENDOR_SPACE_OFFSET_IN_MISC + 1, 'a');
+ ASSERT_FALSE(WriteMiscPartitionVendorSpace(long_message.data(), long_message.size(), 0, &err));
+}