twister: Fix on output directory reaching backup limit

Stop Twister if there are too many backup copies of the output
directory already.
Before this fix, Twister silently kept artifacts from the last run,
unless `--clobber-output` was explicitly given.

Signed-off-by: Dmitrii Golovanov <[email protected]>

Author: golowanow

scripts/pylib/twister/twisterlib/twister_main.py

@@ -94,6 +94,9 @@ def main(options, default_options):
                     print("Renaming output directory to {}".format(new_out))
                     shutil.move(options.outdir, new_out)
                     break
+            else:
+                sys.exit(f"Too many '{options.outdir}.*' directories. Run either with --no-clean, "
+                         "or --clobber-output, or delete these directories manually.")
 
     previous_results_file = None
     os.makedirs(options.outdir, exist_ok=True)