/
common.go
117 lines (98 loc) · 2.28 KB
/
common.go
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package updater
import (
"context"
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"net/http"
"os"
"path/filepath"
"strings"
"github.com/coreos/go-systemd/v22/dbus"
)
func fetchBinaryAndChecksum(url string) (io.ReadCloser, string, error) {
checksum, err := slurpFile(url + ".sha256")
if err != nil {
return nil, "", fmt.Errorf("could not slurp checksum file at %s, err: %w", url, err)
}
//nolint:gosec,noctx
resp, err := http.Get(url)
if err != nil {
return nil, "", fmt.Errorf("could not download url %s, err: %w", url, err)
}
return resp.Body, checksum, nil
}
func replaceBinary(binaryReader io.ReadCloser, binaryPath, checksum string) error {
filename, err := copyToTempFile(binaryReader, binaryPath)
if err != nil {
return err
}
err = validateChecksum(filename, checksum)
if err != nil {
return err
}
if err = os.Rename(filename, binaryPath); err != nil {
return err
}
return nil
}
func copyToTempFile(binaryReader io.ReadCloser, filename string) (string, error) {
file, err := os.CreateTemp(filepath.Dir(filename), filepath.Base(filename))
if err != nil {
return "", err
}
_, err = io.Copy(file, binaryReader)
if err != nil {
return "", err
}
defer binaryReader.Close()
err = os.Chmod(file.Name(), 0755)
if err != nil {
return "", err
}
return file.Name(), nil
}
func validateChecksum(filename string, checksum string) error {
bytes, err := os.ReadFile(filename)
if err != nil {
return err
}
hash := sha256.Sum256(bytes)
sum := string(hex.EncodeToString(hash[:]))
if sum != checksum {
return fmt.Errorf("checksum error")
}
return nil
}
func slurpFile(url string) (string, error) {
//nolint:gosec,noctx
resp, err := http.Get(url)
if err != nil {
return "", err
}
defer resp.Body.Close()
content, err := io.ReadAll(resp.Body)
if err != nil {
return "", err
}
return strings.Split(string(content), " ")[0], nil
}
const done = "done"
func restart(ctx context.Context, unitName string) error {
dbc, err := dbus.NewWithContext(ctx)
if err != nil {
return fmt.Errorf("unable to connect to dbus: %w", err)
}
defer dbc.Close()
c := make(chan string)
_, err = dbc.RestartUnitContext(ctx, unitName, "replace", c)
if err != nil {
return err
}
job := <-c
if job != done {
return fmt.Errorf("restart failed %s", job)
}
return nil
}