I'm creating a quick and dirty Go app to pull application secrets from Vault, and authenticating using the Vault code itself. As part of this, I'm importing the aws credential module from github.com/hashicorp/vault/builtin/credential/aws. This is all working well.
However when running my app, I notice that the command line flags from the Go "testing" module are appearing in the flags.
This can be reproduced by compiling and running the following example script:
package main
import (
"flag"
_ "github.com/hashicorp/vault/builtin/credential/aws"
// Note: this import is masked only to make this demo script compile.
// In my actual code I need to use it, and it is not masked.
)
var myFlag string
func main() {
flag.StringVar(
&myFlag, "myFlag", "", "Test flag",
)
flag.Parse()
flag.Usage()
}
The flags appear like so when calling the binary:
Usage of poc:
-myFlag string
Test flag
-test.bench regexp
run only benchmarks matching regexp
-test.benchmem
print memory allocations for benchmarks
-test.benchtime d
run each benchmark for duration d (default 1s)
-test.blockprofile file
write a goroutine blocking profile to file
-test.blockprofilerate rate
set blocking profile rate (see runtime.SetBlockProfileRate) (default 1)
-test.count n
run tests and benchmarks n times (default 1)
[... more flags from the go testing module ...]
I'm a newbie to Go, so it's entirely possible I'm doing something I'm not supposed to here, but at first glance it seems reasonable to import this module for a command-line tool.
As far as I can see, nothing within the module uses the testing library (other than backend_test.go), so I'm a bit confused as to how these flags are appearing, especially as they don't appear in the Vault command line interface itself.
Is it possible to import and use Vault's credential/aws module without including these flags? Or somehow clear the testing flags before defining my own?
That is because even though you use _ to mask github.com/hashicorp/vault/builtin/credential/aws, the import auctually happened. And the package imported testing, which generate all these flags.
You can get rid of the testing flags by using a new FlagSet.
func main() {
f:=flag.NewFlagSet("Your app name",flag.ExitOnError)
f.StringVar(
&myFlag, "myFlag", "", "Test flag",
)
f.Parse(os.Args)
f.Usage()
}
Playground: https://play.golang.org/p/O8ibPn77L46