sd-device: add sd_device_get_property_value

2 files changed, 26 insertions, 0 deletions

diff --git a/src/libsystemd/sd-device/sd-device.c b/src/libsystemd/sd-device/sd-device.c
index 88df35d9c..8df59ae30 100644
--- a/src/libsystemd/sd-device/sd-device.c
+++ b/src/libsystemd/sd-device/sd-device.c
@@ -1152,3 +1152,28 @@ _public_ int sd_device_get_is_initialized(sd_device *device, int *initialized) {
 
         return 0;
 }
+
+_public_ int sd_device_get_property_value(sd_device *device, const char *key, const char **_value) {
+        char *value;
+        int r;
+
+        assert_return(device, -EINVAL);
+        assert_return(key, -EINVAL);
+        assert_return(_value, -EINVAL);
+
+        r = device_read_uevent_file(device);
+        if (r < 0)
+                return r;
+
+        r = device_read_db(device);
+        if (r < 0)
+                return r;
+
+        value = hashmap_get(device->properties, key);
+        if (!value)
+                return -ENOENT;
+
+        *_value = value;
+
+        return 0;
+}
diff --git a/src/systemd/sd-device.h b/src/systemd/sd-device.h
index 9a74bf0fb..cb910ea93 100644
--- a/src/systemd/sd-device.h
+++ b/src/systemd/sd-device.h
@@ -49,6 +49,7 @@ int sd_device_get_devnum(sd_device *device, dev_t *devnum);
 int sd_device_get_driver(sd_device *device, const char **ret);
 
 int sd_device_get_is_initialized(sd_device *device, int *initialized);
+int sd_device_get_property_value(sd_device *device, const char *key, const char **value);
 
 _SD_END_DECLARATIONS;