pkg/tool: add package

Package tool contains various helper utilitites useful for implementation of command line tools.
Currently it contains Fail/Failf functions that we commonly use
and new support for optional command line flags.

1 files changed, 19 insertions, 0 deletions

diff --git a/pkg/tool/tool.go b/pkg/tool/tool.go
new file mode 100644
index 000000000..bb1f436cc
--- /dev/null
+++ b/pkg/tool/tool.go
@@ -0,0 +1,19 @@
+// Copyright 2020 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+// Package tool contains various helper utilitites useful for implementation of command line tools.
+package tool
+
+import (
+	"fmt"
+	"os"
+)
+
+func Failf(msg string, args ...interface{}) {
+	fmt.Fprintf(os.Stderr, msg+"\n", args...)
+	os.Exit(1)
+}
+
+func Fail(err error) {
+	Failf("%v", err)
+}