Disable automatic update checks if booting from a removable device.
BUG=5335
TEST=unit tests, gmerged to hard-drive as well as USB
Review URL: http://codereview.chromium.org/2868105
diff --git a/utils.h b/utils.h
index f7f734e..6ce4cf3 100644
--- a/utils.h
+++ b/utils.h
@@ -84,13 +84,24 @@
bool RecursiveUnlinkDir(const std::string& path);
// Returns the root device for a partition. For example,
-// RootDevice("/dev/sda3") returns "/dev/sda".
+// RootDevice("/dev/sda3") returns "/dev/sda". Returns an empty string
+// if the input device is not of the "/dev/xyz" form.
std::string RootDevice(const std::string& partition_device);
// Returns the partition number, as a string, of partition_device. For example,
-// PartitionNumber("/dev/sda3") return "3".
+// PartitionNumber("/dev/sda3") returns "3".
std::string PartitionNumber(const std::string& partition_device);
+// Returns the sysfs block device for a root block device. For
+// example, SysfsBlockDevice("/dev/sda") returns
+// "/sys/block/sda". Returns an empty string if the input device is
+// not of the "/dev/xyz" form.
+std::string SysfsBlockDevice(const std::string& device);
+
+// Returns true if the root |device| (e.g., "/dev/sdb") is known to be
+// removable, false otherwise.
+bool IsRemovableDevice(const std::string& device);
+
// Synchronously mount or unmount a filesystem. Return true on success.
// Mounts as ext3 with default options.
bool MountFilesystem(const std::string& device, const std::string& mountpoint,