Fix #216: Correctly parse device-properties for Linux

[msirringhaus]

This needs to bump libudev, because the API had a bug that disallowed iterating the device tree.

Vendoring in Firefox is not a problem, since libudev is only used by auth-rs.
We need, however, to add 3 or 4 function definitions to dom/webauthn/libudev-sys/lib.rs.

If we don't want to do this yet, this PR can just stay pending, since the info is not really used currently (except for some output in the examples).

[jschanck]

Do you have a patch on dom/webauthn/libudev-sys/lib.rs ready to go? Alternatively, it looks like bindgen has libloading support now, so maybe we can get a patch upstream and remove our fork of libudev-sys.

[msirringhaus]

I probably have it in some of my stashes. Even if I can't find it, it was a trivial patch.

[msirringhaus]

Just for completeness, this is the patch:

diff --git a/dom/webauthn/libudev-sys/src/lib.rs b/dom/webauthn/libudev-sys/src/lib.rs
--- a/dom/webauthn/libudev-sys/src/lib.rs
+++ b/dom/webauthn/libudev-sys/src/lib.rs
@@ -124,6 +124,7 @@ macro_rules! define {
 
 // udev
 define!(udev_new, extern "C" fn () -> *mut udev);
+define!(udev_ref, extern "C" fn(*mut udev) -> *mut udev);
 define!(udev_unref, extern "C" fn (*mut udev) -> *mut udev);
 
 // udev_list
@@ -135,6 +136,7 @@ define!(udev_list_entry_get_value, exter
 define!(udev_device_ref, extern "C" fn (*mut udev_device) -> *mut udev_device);
 define!(udev_device_unref, extern "C" fn (*mut udev_device) -> *mut udev_device);
 define!(udev_device_new_from_syspath, extern "C" fn (*mut udev, *const c_char) -> *mut udev_device);
+define!(udev_device_get_udev, extern "C" fn (*mut udev_device) -> *mut udev);
 define!(udev_device_get_parent, extern "C" fn (*mut udev_device) -> *mut udev_device);
 define!(udev_device_get_devpath, extern "C" fn (*mut udev_device) -> *const c_char);
 define!(udev_device_get_subsystem, extern "C" fn (*mut udev_device) -> *const c_char);
@@ -160,6 +162,7 @@ define!(udev_monitor_unref, extern "C" f
 define!(udev_monitor_new_from_netlink, extern "C" fn (*mut udev, *const c_char) -> *mut udev_monitor);
 define!(udev_monitor_enable_receiving, extern "C" fn (*mut udev_monitor) -> c_int);
 define!(udev_monitor_get_fd, extern "C" fn (*mut udev_monitor) -> c_int);
+define!(udev_monitor_get_udev, extern "C" fn (*mut udev_monitor) -> *mut udev);
 define!(udev_monitor_receive_device, extern "C" fn (*mut udev_monitor) -> *mut udev_device);
 define!(udev_monitor_filter_add_match_subsystem_devtype, extern "C" fn (*mut udev_monitor, *const c_char, *const c_char) -> c_int);
 define!(udev_monitor_filter_add_match_tag, extern "C" fn (*mut udev_monitor, *const c_char) -> c_int);
@@ -180,3 +183,4 @@ define!(udev_enumerate_add_match_sysname
 define!(udev_enumerate_add_syspath, extern "C" fn (*mut udev_enumerate, *const c_char) -> c_int);
 define!(udev_enumerate_scan_devices, extern "C" fn (*mut udev_enumerate) -> c_int);
 define!(udev_enumerate_get_list_entry, extern "C" fn (*mut udev_enumerate) -> *mut udev_list_entry);
+define!(udev_enumerate_get_udev, extern "C" fn (*mut udev_enumerate) -> *mut udev);