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//go:build !windows
// Package linuxtpm provides access to a physical TPM device via the device file.
package linuxtpm
import (
"errors"
"fmt"
"os"
"github.com/google/go-tpm/tpm2/transport"
)
var (
// ErrFileIsNotDevice indicates that the TPM file mode was not a device.
ErrFileIsNotDevice = errors.New("TPM file is not a device")
)
// Open opens the TPM device file at the given path.
func Open(path string) (transport.TPMCloser, error) {
fi, err := os.Stat(path)
if err != nil {
return nil, err
}
if fi.Mode()&os.ModeDevice == 0 {
return nil, fmt.Errorf("%w: %s (%s)", ErrFileIsNotDevice, fi.Mode().String(), path)
}
var f *os.File
f, err = os.OpenFile(path, os.O_RDWR, 0600)
if err != nil {
return nil, err
}
return transport.FromReadWriteCloser(f), nil
}
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