go-omaha/omaha/client/machine_linux.go

76 lines
2.1 KiB
Go
Raw Normal View History

// Copyright 2017 CoreOS, Inc.
//
// 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.
// +build linux
package client
import (
"bytes"
"fmt"
"io/ioutil"
)
const (
machineIDPath = "/etc/machine-id"
bootIDPath = "/proc/sys/kernel/random/boot_id"
)
// NewMachineClient creates a machine-wide client, updating applications
// that may be used by multiple users. On Linux the system's machine id
// is used as the user id, and boot id is used as the omaha session id.
func NewMachineClient(serverURL string) (*Client, error) {
machineID, err := ioutil.ReadFile(machineIDPath)
if err != nil {
fmt.Errorf("omaha: failed to read machine id: %v", err)
}
machineID = bytes.TrimSpace(machineID)
// Although machineID should be a UUID, it is formatted as a
// plain hex string, omitting the normal '-' separators, so it
// should be 32 bytes long. It would be nice to reformat it to
// add the '-' chars but update_engine doesn't so stick with its
// behavior for now.
if len(machineID) < 32 {
fmt.Errorf("omaha: incomplete machine id: %q",
machineID)
}
bootID, err := ioutil.ReadFile(bootIDPath)
if err != nil {
fmt.Errorf("omaha: failed to read boot id: %v", err)
}
bootID = bytes.TrimSpace(bootID)
// unlike machineID, bootID *does* include '-' chars.
if len(bootID) < 36 {
fmt.Errorf("omaha: incomplete boot id: %q", bootID)
}
c := &Client{
apiClient: newHTTPClient(),
clientVersion: "go-omaha",
userID: string(machineID),
sessionID: string(bootID),
isMachine: true,
apps: make(map[string]*AppClient),
}
if err := c.SetServerURL(serverURL); err != nil {
return nil, err
}
return c, nil
}