[PATCH 31/44] bbu: add easy way to check for existent providers

[Ahmad Fatoum]

This function will be called from the upcoming bfetch command to
determine whether the running barebox has barebox update handlers
registered.

Signed-off-by: Ahmad Fatoum <a.fat...@barebox.org>
---
 common/bbu.c  | 8 ++++++++
 include/bbu.h | 7 +++++++
 2 files changed, 15 insertions(+)

diff --git a/common/bbu.c b/common/bbu.c
index 0dc32e45ea2f..03261583fe0b 100644
--- a/common/bbu.c
+++ b/common/bbu.c
@@ -289,6 +289,14 @@ int barebox_update(struct bbu_data *data, struct 
bbu_handler *handler)
        return 0;
 }
 
+/*
+ * report whether any update handlers have been registered so far
+ */
+bool bbu_handlers_available(void)
+{
+       return !list_empty(&bbu_image_handlers);
+}
+
 /*
  * print a list of all registered update handlers
  */
diff --git a/include/bbu.h b/include/bbu.h
index bce138d95b37..94006563c90e 100644
--- a/include/bbu.h
+++ b/include/bbu.h
@@ -58,6 +58,8 @@ int bbu_std_file_handler(struct bbu_handler *handler,
 
 #ifdef CONFIG_BAREBOX_UPDATE
 
+bool bbu_handlers_available(void);
+
 int bbu_register_handler(struct bbu_handler *);
 
 int bbu_register_std_file_update(const char *name, unsigned long flags,
@@ -71,6 +73,11 @@ int bbu_mmcboot_register_handler(const char *name,
 
 #else
 
+static inline bool bbu_handlers_available(void)
+{
+       return false;
+}
+
 static inline int bbu_register_handler(struct bbu_handler *unused)
 {
        return -EINVAL;
-- 
2.39.5