ueventd: remove character device symlinks (/dev/usb/*)
While refactoring ueventd, I was looking for code the character device
symlinks (/dev/usb/*) that ueventd creates, such that I could test it
on a real device. I found none in our tree, and history showing Xoom,
which was last supported years ago, was the last user. If this code
is in fact obsolete, let's remove it.
Test: boot bullhead
Test: init unit tests
Change-Id: I601f7165eb06d36b31b6dcf69ee9e0a449d81a96
diff --git a/init/devices.cpp b/init/devices.cpp
index 215d2ea..13cf991 100644
--- a/init/devices.cpp
+++ b/init/devices.cpp
@@ -219,7 +219,7 @@
return {0600, 0, 0};
}
-void DeviceHandler::MakeDevice(const std::string& path, int block, int major, int minor,
+void DeviceHandler::MakeDevice(const std::string& path, bool block, int major, int minor,
const std::vector<std::string>& links) const {
auto[mode, uid, gid] = GetDevicePermissions(path, links);
mode |= (block ? S_IFBLK : S_IFCHR);
@@ -279,45 +279,6 @@
}
}
-std::vector<std::string> DeviceHandler::GetCharacterDeviceSymlinks(const Uevent& uevent) const {
- std::string parent_device;
- if (!FindPlatformDevice(uevent.path, &parent_device)) return {};
-
- // skip path to the parent driver
- std::string path = uevent.path.substr(parent_device.length());
-
- if (!StartsWith(path, "/usb")) return {};
-
- // skip root hub name and device. use device interface
- // skip 3 slashes, including the first / by starting the search at the 1st character, not 0th.
- // then extract what comes between the 3rd and 4th slash
- // e.g. "/usb/usb_device/name/tty2-1:1.0" -> "name"
-
- std::string::size_type start = 0;
- start = path.find('/', start + 1);
- if (start == std::string::npos) return {};
-
- start = path.find('/', start + 1);
- if (start == std::string::npos) return {};
-
- auto end = path.find('/', start + 1);
- if (end == std::string::npos) return {};
-
- start++; // Skip the first '/'
-
- auto length = end - start;
- if (length == 0) return {};
-
- auto name_string = path.substr(start, length);
-
- std::vector<std::string> links;
- links.emplace_back("/dev/usb/" + uevent.subsystem + name_string);
-
- mkdir("/dev/usb", 0755);
-
- return links;
-}
-
// replaces any unacceptable characters with '_', the
// length of the resulting string is equal to the input string
void SanitizePartitionName(std::string* string) {
@@ -385,7 +346,7 @@
return links;
}
-void DeviceHandler::HandleDevice(const std::string& action, const std::string& devpath, int block,
+void DeviceHandler::HandleDevice(const std::string& action, const std::string& devpath, bool block,
int major, int minor, const std::vector<std::string>& links) const {
if (action == "add") {
MakeDevice(devpath, block, major, minor, links);
@@ -411,31 +372,26 @@
}
}
-void DeviceHandler::HandleBlockDeviceEvent(const Uevent& uevent) const {
- // if it's not a /dev device, nothing to do
- if (uevent.major < 0 || uevent.minor < 0) return;
-
- const char* base = "/dev/block/";
- make_dir(base, 0755, sehandle_);
-
- std::string name = Basename(uevent.path);
- std::string devpath = base + name;
-
- std::vector<std::string> links;
- if (StartsWith(uevent.path, "/devices")) {
- links = GetBlockDeviceSymlinks(uevent);
+void DeviceHandler::HandleDeviceEvent(const Uevent& uevent) {
+ if (uevent.action == "add" || uevent.action == "change" || uevent.action == "online") {
+ FixupSysPermissions(uevent.path, uevent.subsystem);
}
- HandleDevice(uevent.action, devpath, 1, uevent.major, uevent.minor, links);
-}
-
-void DeviceHandler::HandleGenericDeviceEvent(const Uevent& uevent) const {
// if it's not a /dev device, nothing to do
if (uevent.major < 0 || uevent.minor < 0) return;
std::string devpath;
+ std::vector<std::string> links;
+ bool block = false;
- if (StartsWith(uevent.subsystem, "usb")) {
+ if (uevent.subsystem == "block") {
+ block = true;
+ devpath = "/dev/block/" + Basename(uevent.path);
+
+ if (StartsWith(uevent.path, "/devices")) {
+ links = GetBlockDeviceSymlinks(uevent);
+ }
+ } else if (StartsWith(uevent.subsystem, "usb")) {
if (uevent.subsystem == "usb") {
if (!uevent.device_name.empty()) {
devpath = "/dev/" + uevent.device_name;
@@ -461,21 +417,7 @@
mkdir_recursive(Dirname(devpath), 0755, sehandle_);
- auto links = GetCharacterDeviceSymlinks(uevent);
-
- HandleDevice(uevent.action, devpath, 0, uevent.major, uevent.minor, links);
-}
-
-void DeviceHandler::HandleDeviceEvent(const Uevent& uevent) {
- if (uevent.action == "add" || uevent.action == "change" || uevent.action == "online") {
- FixupSysPermissions(uevent.path, uevent.subsystem);
- }
-
- if (uevent.subsystem == "block") {
- HandleBlockDeviceEvent(uevent);
- } else {
- HandleGenericDeviceEvent(uevent);
- }
+ HandleDevice(uevent.action, devpath, block, uevent.major, uevent.minor, links);
}
DeviceHandler::DeviceHandler(std::vector<Permissions> dev_permissions,
diff --git a/init/devices.h b/init/devices.h
index 5105ad7..c64f5fb 100644
--- a/init/devices.h
+++ b/init/devices.h
@@ -115,16 +115,12 @@
bool FindPlatformDevice(std::string path, std::string* platform_device_path) const;
std::tuple<mode_t, uid_t, gid_t> GetDevicePermissions(
const std::string& path, const std::vector<std::string>& links) const;
- void MakeDevice(const std::string& path, int block, int major, int minor,
+ void MakeDevice(const std::string& path, bool block, int major, int minor,
const std::vector<std::string>& links) const;
- std::vector<std::string> GetCharacterDeviceSymlinks(const Uevent& uevent) const;
- void HandleDevice(const std::string& action, const std::string& devpath, int block, int major,
+ void HandleDevice(const std::string& action, const std::string& devpath, bool block, int major,
int minor, const std::vector<std::string>& links) const;
void FixupSysPermissions(const std::string& upath, const std::string& subsystem) const;
- void HandleBlockDeviceEvent(const Uevent& uevent) const;
- void HandleGenericDeviceEvent(const Uevent& uevent) const;
-
std::vector<Permissions> dev_permissions_;
std::vector<SysfsPermissions> sysfs_permissions_;
std::vector<Subsystem> subsystems_;
diff --git a/init/devices_test.cpp b/init/devices_test.cpp
index 57d8e0f..ac4ab9b 100644
--- a/init/devices_test.cpp
+++ b/init/devices_test.cpp
@@ -30,7 +30,7 @@
class DeviceHandlerTester {
public:
void TestGetSymlinks(const std::string& platform_device, const Uevent& uevent,
- const std::vector<std::string> expected_links, bool block) {
+ const std::vector<std::string> expected_links) {
TemporaryDir fake_sys_root;
device_handler_.sysfs_mount_point_ = fake_sys_root.path;
@@ -44,11 +44,7 @@
mkdir_recursive(android::base::Dirname(fake_sys_root.path + uevent.path), 0777, nullptr);
std::vector<std::string> result;
- if (block) {
- result = device_handler_.GetBlockDeviceSymlinks(uevent);
- } else {
- result = device_handler_.GetCharacterDeviceSymlinks(uevent);
- }
+ result = device_handler_.GetBlockDeviceSymlinks(uevent);
auto expected_size = expected_links.size();
ASSERT_EQ(expected_size, result.size());
@@ -64,95 +60,6 @@
DeviceHandler device_handler_;
};
-TEST(device_handler, get_character_device_symlinks_success) {
- const char* platform_device = "/devices/platform/some_device_name";
- Uevent uevent = {
- .path = "/devices/platform/some_device_name/usb/usb_device/name/tty2-1:1.0",
- .subsystem = "tty",
- };
- std::vector<std::string> expected_result{"/dev/usb/ttyname"};
-
- DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, false);
-}
-
-TEST(device_handler, get_character_device_symlinks_no_pdev_match) {
- const char* platform_device = "/devices/platform/some_device_name";
- Uevent uevent = {
- .path = "/device/name/tty2-1:1.0", .subsystem = "tty",
- };
- std::vector<std::string> expected_result;
-
- DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, false);
-}
-
-TEST(device_handler, get_character_device_symlinks_nothing_after_platform_device) {
- const char* platform_device = "/devices/platform/some_device_name";
- Uevent uevent = {
- .path = "/devices/platform/some_device_name", .subsystem = "tty",
- };
- std::vector<std::string> expected_result;
-
- DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, false);
-}
-
-TEST(device_handler, get_character_device_symlinks_no_usb_found) {
- const char* platform_device = "/devices/platform/some_device_name";
- Uevent uevent = {
- .path = "/devices/platform/some_device_name/bad/bad/", .subsystem = "tty",
- };
- std::vector<std::string> expected_result;
-
- DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, false);
-}
-
-TEST(device_handler, get_character_device_symlinks_no_roothub) {
- const char* platform_device = "/devices/platform/some_device_name";
- Uevent uevent = {
- .path = "/devices/platform/some_device_name/usb/", .subsystem = "tty",
- };
- std::vector<std::string> expected_result;
-
- DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, false);
-}
-
-TEST(device_handler, get_character_device_symlinks_no_usb_device) {
- const char* platform_device = "/devices/platform/some_device_name";
- Uevent uevent = {
- .path = "/devices/platform/some_device_name/usb/usb_device/", .subsystem = "tty",
- };
- std::vector<std::string> expected_result;
-
- DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, false);
-}
-
-TEST(device_handler, get_character_device_symlinks_no_final_slash) {
- const char* platform_device = "/devices/platform/some_device_name";
- Uevent uevent = {
- .path = "/devices/platform/some_device_name/usb/usb_device/name", .subsystem = "tty",
- };
- std::vector<std::string> expected_result;
-
- DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, false);
-}
-
-TEST(device_handler, get_character_device_symlinks_no_final_name) {
- const char* platform_device = "/devices/platform/some_device_name";
- Uevent uevent = {
- .path = "/devices/platform/some_device_name/usb/usb_device//", .subsystem = "tty",
- };
- std::vector<std::string> expected_result;
-
- DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, false);
-}
-
TEST(device_handler, get_block_device_symlinks_success_platform) {
// These are actual paths from bullhead
const char* platform_device = "/devices/soc.0/f9824900.sdhci";
@@ -164,7 +71,7 @@
std::vector<std::string> expected_result{"/dev/block/platform/soc.0/f9824900.sdhci/mmcblk0"};
DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, true);
+ device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result);
}
TEST(device_handler, get_block_device_symlinks_success_platform_with_partition) {
@@ -182,7 +89,7 @@
};
DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, true);
+ device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result);
}
TEST(device_handler, get_block_device_symlinks_success_platform_with_partition_only_num) {
@@ -198,7 +105,7 @@
};
DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, true);
+ device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result);
}
TEST(device_handler, get_block_device_symlinks_success_platform_with_partition_only_name) {
@@ -214,7 +121,7 @@
};
DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, true);
+ device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result);
}
TEST(device_handler, get_block_device_symlinks_success_pci) {
@@ -225,7 +132,7 @@
std::vector<std::string> expected_result{"/dev/block/pci/pci0000:00/0000:00:1f.2/mmcblk0"};
DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, true);
+ device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result);
}
TEST(device_handler, get_block_device_symlinks_pci_bad_format) {
@@ -236,7 +143,7 @@
std::vector<std::string> expected_result{};
DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, true);
+ device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result);
}
TEST(device_handler, get_block_device_symlinks_success_vbd) {
@@ -247,7 +154,7 @@
std::vector<std::string> expected_result{"/dev/block/vbd/1234/mmcblk0"};
DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, true);
+ device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result);
}
TEST(device_handler, get_block_device_symlinks_vbd_bad_format) {
@@ -258,7 +165,7 @@
std::vector<std::string> expected_result{};
DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, true);
+ device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result);
}
TEST(device_handler, get_block_device_symlinks_no_matches) {
@@ -271,7 +178,7 @@
std::vector<std::string> expected_result;
DeviceHandlerTester device_handler_tester_;
- device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result, true);
+ device_handler_tester_.TestGetSymlinks(platform_device, uevent, expected_result);
}
TEST(device_handler, sanitize_null) {