CLI: If METS is not readable, show help and exit 1, OCR-D/core#438

OCR-D · Jun 7, 2020 · a219f7c · a219f7c
1 parent fa3c56f
commit a219f7c
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diff --git a/cli.md b/cli.md
@@ -83,6 +83,9 @@ Omit to use default parameters only, or for processors without any parameters.
 
 Input [METS](mets) URL. Default: `mets.xml`
 
+If `METS_IN` is a file path but the file is not readable, processors must
+show the [`--help` message](#-h---help) message and exit with return code `1`.
+
 ### `-w, --working-dir DIR`
 
 Working Directory. Default: current working directory.