Move KernelDeviceOfBootDevice() to utils.
The function to construct the kernel partition block device from
its corresponding boot device uses only string manipulations, and
doesn't operate on the underlying hardware. This removes the
function from HardwareInterface, in favor of utils.
BUG=None
TEST=unit tests
Change-Id: I94b2c477413c4b484045a696f0ffbc77d9853195
Reviewed-on: https://chromium-review.googlesource.com/174913
Commit-Queue: Richard Barnette <jrbarnette@chromium.org>
Tested-by: Richard Barnette <jrbarnette@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
diff --git a/utils.cc b/utils.cc
index 7a304ee..5d32466 100644
--- a/utils.cc
+++ b/utils.cc
@@ -149,6 +149,36 @@
}
+const string KernelDeviceOfBootDevice(const std::string& boot_device) {
+ if (boot_device.empty())
+ return boot_device;
+
+ string ubiblock_prefix("/dev/ubiblock");
+ string ret;
+ char partition_num;
+ if (StringHasPrefix(boot_device, ubiblock_prefix)) {
+ // eg: /dev/ubiblock3_0 becomes /dev/mtdblock2
+ ret = "/dev/mtdblock";
+ partition_num = boot_device[ubiblock_prefix.size()];
+ } else {
+ // eg: /dev/sda3 becomes /dev/sda2
+ // eg: /dev/mmcblk0p3 becomes /dev/mmcblk0p2
+ ret = boot_device.substr(0, boot_device.size() - 1);
+ partition_num = boot_device[boot_device.size() - 1];
+ }
+
+ // Currently this assumes the partition number of the boot device is
+ // 3, 5, or 7, and changes it to 2, 4, or 6, respectively, to
+ // get the kernel device.
+ if (partition_num == '3' || partition_num == '5' || partition_num == '7') {
+ ret.append(1, partition_num - 1);
+ return ret;
+ }
+
+ return "";
+}
+
+
bool WriteFile(const char* path, const char* data, int data_len) {
DirectFileWriter writer;
TEST_AND_RETURN_FALSE_ERRNO(0 == writer.Open(path,