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platform_system_core
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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
This commit is contained in:
Tom Cherry 2017-06-23 12:43:48 -07:00
parent c70bf5836c
commit b4dd881ffd
3 changed files with 29 additions and 184 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

90
init/devices.cpp
View File

@ -219,7 +219,7 @@ std::tuple<mode_t, uid_t, gid_t> DeviceHandler::GetDevicePermissions(
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 @@ out:
}
}
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 @@ std::vector<std::string> DeviceHandler::GetBlockDeviceSymlinks(const Uevent& uev
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::HandleDevice(const std::string& action, const std::string& d
}
}
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 @@ void DeviceHandler::HandleGenericDeviceEvent(const Uevent& uevent) const {
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,

8
init/devices.h
View File

@ -115,16 +115,12 @@ class DeviceHandler {
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_;

115
init/devices_test.cpp
View File

@ -30,7 +30,7 @@ namespace init {
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 @@ class DeviceHandlerTester {
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 @@ class DeviceHandlerTester {
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 @@ TEST(device_handler, get_block_device_symlinks_success_platform) {
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 @@ TEST(device_handler, get_block_device_symlinks_success_platform_with_partition)
};
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 @@ TEST(device_handler, get_block_device_symlinks_success_platform_with_partition_o
};
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 @@ TEST(device_handler, get_block_device_symlinks_success_platform_with_partition_o
};
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 @@ TEST(device_handler, get_block_device_symlinks_success_pci) {
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 @@ TEST(device_handler, get_block_device_symlinks_pci_bad_format) {
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 @@ TEST(device_handler, get_block_device_symlinks_success_vbd) {
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 @@ TEST(device_handler, get_block_device_symlinks_vbd_bad_format) {
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 @@ TEST(device_handler, get_block_device_symlinks_no_matches) {
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) {