tools: record udev properties in libinput-record

Only the ones we care about in libinput but for those it's handy to know which
ones are set (especially the LIBINPUT_MODEL ones).

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

meson.build

@@ -472,7 +472,7 @@ configure_file(input : 'tools/libinput-measure-trackpoint-range.man',
 libinput_record_sources = [ 'tools/libinput-record.c', git_version_h ]
 executable('libinput-record',
 	   libinput_record_sources,
-	   dependencies : deps_tools,
+	   dependencies : deps_tools + [dep_udev],
 	   include_directories : [includes_src, includes_include],
 	   install_dir : libinput_tool_path,
 	   install : true,

tools/libinput-record.c

@@ -26,13 +26,16 @@
 #include <errno.h>
 #include <linux/input.h>
 #include <libevdev/libevdev.h>
+#include <libudev.h>
 #include <sys/signalfd.h>
 #include <sys/utsname.h>
+#include <sys/stat.h>
 #include <string.h>
 #include <dirent.h>
 #include <fcntl.h>
 #include <getopt.h>
 #include <poll.h>
+#include <unistd.h>
 #include <signal.h>
 #include <stdbool.h>
 
@@ -551,12 +554,61 @@ print_evdev_description(struct record_context *ctx, struct record_device *dev)
 	indent_pop(ctx);
 }
 
+static inline void
+print_udev_properties(struct record_context *ctx, struct record_device *dev)
+{
+	struct udev *udev = NULL;
+	struct udev_device *udev_device = NULL;
+	struct udev_list_entry *entry;
+	struct stat st;
+
+	if (stat(dev->devnode, &st) < 0)
+		return;
+
+	udev = udev_new();
+	if (!udev)
+		goto out;
+
+	udev_device = udev_device_new_from_devnum(udev, 'c', st.st_rdev);
+	if (!udev_device)
+		goto out;
+
+	iprintf(ctx, "udev:\n");
+	indent_push(ctx);
+
+	iprintf(ctx, "properties:\n");
+	indent_push(ctx);
+
+	entry = udev_device_get_properties_list_entry(udev_device);
+	while (entry) {
+		const char *key, *value;
+
+		key = udev_list_entry_get_name(entry);
+
+		if (strneq(key, "ID_INPUT", 8) ||
+		    strneq(key, "LIBINPUT", 8) ||
+		    strneq(key, "EV_ABS", 6)) {
+			value = udev_list_entry_get_value(entry);
+			iprintf(ctx, "- %s=%s\n", key, value);
+		}
+
+		entry = udev_list_entry_get_next(entry);
+	}
+
+	indent_pop(ctx);
+	indent_pop(ctx);
+out:
+	udev_device_unref(udev_device);
+	udev_unref(udev);
+}
+
 static inline void
 print_device_description(struct record_context *ctx, struct record_device *dev)
 {
 	iprintf(ctx, "- node: %s\n", dev->devnode);
 
 	print_evdev_description(ctx, dev);
+	print_udev_properties(ctx, dev);
 }
 
 static int is_event_node(const struct dirent *dir) {

tools/libinput-record.man

@@ -119,6 +119,10 @@ devices:
         57: [0, 65535, 0, 0, 0]
         58: [0, 255, 0, 0, 0]
       properties: [0, 2, 4]
+    udev:
+      properties:
+      - ID_INPUT_MOUSE=1
+      - ID_INPUT=1
     events:
       - evdev:
         - [  0,      0,   3,  57,  1420] # EV_ABS / ABS_MT_TRACKING_ID   1420
@@ -192,6 +196,9 @@ the device node recorded
 .B evdev
 A dictionary with the evdev device information.
 .TP 8
+.B udev
+A dictionary with the udev device information.
+.TP 8
 .B events
 A list of dictionaries with the recorded events
 .SS evdev
@@ -213,6 +220,13 @@ in decimal format.
 .TP 8
 .B properties: [0, 1, ...]
 Array with all \fBINPUT_PROP_FOO\fR constants. May be an empty array.
+.SS udev
+.TP 8
+.B properties: list of strings
+A list of udev properties in the \fBkey=value\fR format. This is not the
+complete list of properties assigned to the device but a subset that is
+relevant to libinput. These properties may include properties set on a
+parent device.
 
 .SS events
 A list of the recorded events. The list contains dictionaries