libudev: enumerate - add lookup by property

4 files changed, 73 insertions, 0 deletions

diff --git a/udev/lib/exported_symbols b/udev/lib/exported_symbols
index abb6ae3a57..a2f0ca7cb3 100644
--- a/udev/lib/exported_symbols
+++ b/udev/lib/exported_symbols
@@ -42,6 +42,7 @@ udev_enumerate_add_match_subsystem
 udev_enumerate_add_nomatch_subsystem
 udev_enumerate_add_match_sysattr
 udev_enumerate_add_nomatch_sysattr
+udev_enumerate_add_match_property
 udev_enumerate_scan_devices
 udev_enumerate_scan_subsystems
 udev_enumerate_add_syspath
diff --git a/udev/lib/libudev-enumerate.c b/udev/lib/libudev-enumerate.c
index 618ffbc3e9..abc89d5cab 100644
--- a/udev/lib/libudev-enumerate.c
+++ b/udev/lib/libudev-enumerate.c
@@ -39,6 +39,7 @@ struct udev_enumerate {
 	struct udev_list_node sysattr_nomatch_list;
 	struct udev_list_node subsystem_match_list;
 	struct udev_list_node subsystem_nomatch_list;
+	struct udev_list_node properties_match_list;
 	struct udev_list_node devices_list;
 	int devices_sorted;
 };
@@ -63,6 +64,7 @@ struct udev_enumerate *udev_enumerate_new(struct udev *udev)
 	udev_list_init(&udev_enumerate->sysattr_nomatch_list);
 	udev_list_init(&udev_enumerate->subsystem_match_list);
 	udev_list_init(&udev_enumerate->subsystem_nomatch_list);
+	udev_list_init(&udev_enumerate->properties_match_list);
 	return udev_enumerate;
 }
 
@@ -86,6 +88,7 @@ void udev_enumerate_unref(struct udev_enumerate *udev_enumerate)
 	udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->sysattr_nomatch_list);
 	udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->subsystem_match_list);
 	udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->subsystem_nomatch_list);
+	udev_list_cleanup_entries(udev_enumerate->udev, &udev_enumerate->properties_match_list);
 	free(udev_enumerate);
 }
 
@@ -178,6 +181,18 @@ exit:
 	return match;
 }
 
+int udev_enumerate_add_match_property(struct udev_enumerate *udev_enumerate, const char *property, const char *value)
+{
+	if (udev_enumerate == NULL)
+		return -EINVAL;
+	if (property == NULL)
+		return 0;
+	if (udev_list_entry_add(udev_enumerate_get_udev(udev_enumerate),
+				&udev_enumerate->properties_match_list, property, value, 1, 0) == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
 static int match_sysattr(struct udev_enumerate *udev_enumerate, const char *syspath)
 {
 	struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
@@ -204,6 +219,51 @@ static int match_sysattr(struct udev_enumerate *udev_enumerate, const char *sysp
 	return 1;
 }
 
+static int match_property(struct udev_enumerate *udev_enumerate, const char *syspath)
+{
+	struct udev_device *dev;
+	struct udev_list_entry *list_entry;
+	int match = 0;
+
+	/* no match always matches */
+	if (udev_list_get_entry(&udev_enumerate->properties_match_list) == NULL)
+		return 1;
+
+	/* no device does not match */
+	dev = udev_device_new_from_syspath(udev_enumerate->udev, syspath);
+	if (dev == NULL)
+		return 0;
+
+	/* loop over matches */
+	udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_enumerate->properties_match_list)) {
+		struct udev_list_entry *property_entry;
+
+		/* loop over device properties */
+		udev_list_entry_foreach(property_entry, udev_device_get_properties_list_entry(dev)) {
+			if (fnmatch(udev_list_entry_get_name(list_entry), udev_list_entry_get_name(property_entry), 0) == 0) {
+				const char *match_value;
+				const char *dev_value;
+
+				match_value = udev_list_entry_get_value(list_entry);
+				dev_value = udev_list_entry_get_value(property_entry);
+				if (match_value == NULL && dev_value == NULL) {
+					match = 1;
+					goto out;
+				}
+				if (match_value == NULL || dev_value == NULL)
+					continue;
+				if (fnmatch(match_value, dev_value, 0) == 0) {
+					match = 1;
+					goto out;
+				}
+			}
+		}
+	}
+out:
+	udev_device_unref(dev);
+	return match;
+}
+
 static int scan_dir_and_add_devices(struct udev_enumerate *udev_enumerate,
 				    const char *basedir, const char *subdir1, const char *subdir2)
 {
@@ -248,6 +308,8 @@ static int scan_dir_and_add_devices(struct udev_enumerate *udev_enumerate,
 			continue;
 		if (!match_sysattr(udev_enumerate, syspath))
 			continue;
+		if (!match_property(udev_enumerate, syspath))
+			continue;
 		udev_list_entry_add(udev, &udev_enumerate->devices_list, syspath, NULL, 1, 1);
 	}
 	closedir(dir);
diff --git a/udev/lib/libudev.h b/udev/lib/libudev.h
index 64746ad7c8..a9e399c4b4 100644
--- a/udev/lib/libudev.h
+++ b/udev/lib/libudev.h
@@ -101,6 +101,7 @@ extern int udev_enumerate_add_match_subsystem(struct udev_enumerate *udev_enumer
 extern int udev_enumerate_add_nomatch_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem);
 extern int udev_enumerate_add_match_sysattr(struct udev_enumerate *udev_enumerate, const char *sysattr, const char *value);
 extern int udev_enumerate_add_nomatch_sysattr(struct udev_enumerate *udev_enumerate, const char *sysattr, const char *value);
+extern int udev_enumerate_add_match_property(struct udev_enumerate *udev_enumerate, const char *property, const char *value);
 extern int udev_enumerate_add_syspath(struct udev_enumerate *udev_enumerate, const char *syspath);
 extern int udev_enumerate_scan_devices(struct udev_enumerate *udev_enumerate);
 extern int udev_enumerate_scan_subsystems(struct udev_enumerate *udev_enumerate);
diff --git a/udev/lib/test-libudev.c b/udev/lib/test-libudev.c
index 4c3bc16aed..5120626520 100644
--- a/udev/lib/test-libudev.c
+++ b/udev/lib/test-libudev.c
@@ -359,6 +359,15 @@ static int test_enumerate(struct udev *udev, const char *subsystem)
 	udev_enumerate_scan_subsystems(udev_enumerate);
 	test_enumerate_print_list(udev_enumerate);
 	udev_enumerate_unref(udev_enumerate);
+
+	printf("enumerate 'property IF_FS_*=filesystem'\n");
+	udev_enumerate = udev_enumerate_new(udev);
+	if (udev_enumerate == NULL)
+		return -1;
+	udev_enumerate_add_match_property(udev_enumerate, "ID_FS*", "filesystem");
+	udev_enumerate_scan_devices(udev_enumerate);
+	test_enumerate_print_list(udev_enumerate);
+	udev_enumerate_unref(udev_enumerate);
 	return 0;
 }