tools: qconfig: print a proper error when database is missing

When CONFIG_DATABASE does not exist, read_database() would fail with a
Python traceback. Add a pre-check to print a clear message asking the
user to generate the database first with the -b option.

Signed-off-by: Julien Stephan <[email protected]>
Reviewed-by: Tom Rini <[email protected]>

1 files changed, 4 insertions, 0 deletions

diff --git a/tools/qconfig.py b/tools/qconfig.py
index 5b85f9d22c3..9b151566e03 100755
--- a/tools/qconfig.py
+++ b/tools/qconfig.py
@@ -871,6 +871,10 @@ def read_database():
                 value: set of boards using that option
 
     """
+    if not os.path.exists(CONFIG_DATABASE):
+        sys.exit(f"Error: database '{CONFIG_DATABASE}' not found. "
+                 f"Did you forget to generate it first with the -b option?")
+
     configs = {}
 
     # key is defconfig name, value is dict of (CONFIG_xxx, value)