[Buildroot] [PATCH] utils/generate-cyclonedx: fix detecting of tty

[Heiko Thiery <heiko.thiery@gmail.com>]

Check if the script shall read from stdin if data is piped into.
Otherwise read from the input file or if not specified print usage and
exit.

Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
---
 utils/generate-cyclonedx | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/utils/generate-cyclonedx b/utils/generate-cyclonedx
index 993d7154ef..365c2b06ea 100755
--- a/utils/generate-cyclonedx
+++ b/utils/generate-cyclonedx
@@ -273,13 +273,19 @@ def main():
                 Example usage: make show-info | utils/generate-cyclonedx.py | jq > sbom.json
             '''
         )
-    parser.add_argument("-i", "--in-file", nargs="?", type=argparse.FileType("r"), default=sys.stdin)
-    parser.add_argument("-o", "--out-file", nargs="?", type=argparse.FileType("w"), default=sys.stdout)
+    parser.add_argument("-i", "--in-file", nargs="?", type=argparse.FileType("r"),
+                        default=(None if sys.stdin.isatty() else sys.stdin))
+    parser.add_argument("-o", "--out-file", nargs="?", type=argparse.FileType("w"),
+                        default=sys.stdout)
     parser.add_argument("--virtual", default=False, action='store_true',
                         help="This option includes virtual packages to the CycloneDX output")
 
     args = parser.parse_args()
 
+    if args.in_file is None:
+        parser.print_help()
+        sys.exit(1)
+
     show_info_dict = json.load(args.in_file)
 
     # Remove rootfs and virtual packages if not explicitly included
-- 
2.39.5

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