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instanceinfo.go
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instanceinfo.go
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// Copyright 2018 Capital One Services, LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ssm
import (
"encoding/json"
"io/ioutil"
"os/exec"
"path/filepath"
"strings"
"github.com/aws/amazon-ssm-agent/agent/appconfig"
"github.com/pkg/errors"
)
var (
// The default path for Agent Registration State on Linux.
DefaultSSMRegistrationPath = filepath.Join(appconfig.DefaultDataStorePath, "registration")
)
func ReadRegistrationFile(path string) (id string, err error) {
data, err := ioutil.ReadFile(path)
if err != nil {
return
}
var s struct {
ManagedInstanceID string
Region string
}
err = json.Unmarshal(data, &s)
if err != nil {
return
}
if strings.HasPrefix(s.ManagedInstanceID, "mi-") {
return s.ManagedInstanceID, nil
}
return
}
// InstanceInfo contains information for instances registered with SSM. This
// is collected from the output of the following command:
// ssm-cli get-instance-information
type InstanceInfo struct {
InstanceId string `json:"instance-id"`
Region string `json:"region"`
ReleaseVersion string `json:"release-version"`
}
func GetInstanceInformation() (*InstanceInfo, error) {
cmd, err := exec.LookPath("ssm-cli")
if err != nil {
return nil, errors.WithStack(err)
}
out, err := exec.Command(cmd, "get-instance-information").Output()
if err != nil {
return nil, errors.WithStack(err)
}
var info InstanceInfo
if err := json.Unmarshal(out, &info); err != nil {
return nil, errors.WithStack(err)
}
return &info, nil
}