emissary/internal/agent/controller/openwrt/hash.go

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package openwrt
import (
"crypto/sha256"
"encoding/hex"
"io"
"os"
"github.com/pkg/errors"
)
func hash(path string) (string, error) {
file, err := os.Open(path)
if err != nil {
return "", errors.WithStack(err)
}
hasher := sha256.New()
defer func() {
if err := file.Close(); err != nil {
panic(errors.WithStack(err))
}
}()
if _, err := io.Copy(hasher, file); err != nil {
return "", errors.WithStack(err)
}
return hex.EncodeToString(hasher.Sum(nil)), nil
}