Be more precise about exit codes.

cmd/csaf_validator/main.go

@@ -23,10 +23,10 @@ import (
 )
 
 const (
+	exitCodeSchemaInvalid = 1 << iota
+	exitCodeNoRemoteValidator
+	exitCodeFailedRemoteValidation
 	exitCodeAllValid = 0
-	exitCodeSchemaInvalid          = 1 << 0
-	exitCodeNoRemoteValidator      = 1 << 1
-	exitCodeFailedRemoteValidation = 1 << 2
 )
 
 type options struct {

docs/csaf_validator.md

@@ -3,11 +3,11 @@
 is a tool to validate local advisories files against the JSON Schema and an optional remote validator.
 
 ### Exit codes
-If no fatal error occurs the program will exit with the following codes:
-- `0`: all valid
-- `2⁰`: schema invalid
-- `2¹`: no remote validator configured
-- `2²`: failure in remote validation
+If no fatal error occurs the program will exit with an exit code `n` with the following conditions:
+- `n == 0`: all valid
+- `(n / 2) % 1 == 1`: schema validation failed
+- `(n / 4) % 1 == 1`: no remote validator configured
+- `(n / 8) % 1 == 1`: failure in remote validation
 
 ### Usage