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// SPDX-License-Identifier: GPL-3.0-or-later
package smartctl
import (
"context"
"errors"
"fmt"
"os/exec"
"time"
"github.com/netdata/netdata/go/go.d.plugin/logger"
"github.com/tidwall/gjson"
)
func newSmartctlCliExec(ndsudoPath string, timeout time.Duration, log *logger.Logger) *smartctlCliExec {
return &smartctlCliExec{
Logger: log,
ndsudoPath: ndsudoPath,
timeout: timeout,
}
}
type smartctlCliExec struct {
*logger.Logger
ndsudoPath string
timeout time.Duration
}
func (e *smartctlCliExec) scan() (*gjson.Result, error) {
return e.execute("smartctl-json-scan")
}
func (e *smartctlCliExec) deviceInfo(deviceName, deviceType, powerMode string) (*gjson.Result, error) {
return e.execute("smartctl-json-device-info",
"--deviceName", deviceName,
"--deviceType", deviceType,
"--powerMode", powerMode,
)
}
func (e *smartctlCliExec) execute(args ...string) (*gjson.Result, error) {
ctx, cancel := context.WithTimeout(context.Background(), e.timeout)
defer cancel()
cmd := exec.CommandContext(ctx, e.ndsudoPath, args...)
e.Debugf("executing '%s'", cmd)
bs, err := cmd.Output()
if err != nil {
if errors.Is(err, context.DeadlineExceeded) || isExecExitCode(err, 1) || len(bs) == 0 {
return nil, fmt.Errorf("'%s' execution failed: %v", cmd, err)
}
}
if len(bs) == 0 {
return nil, fmt.Errorf("'%s' returned no output", cmd)
}
if !gjson.ValidBytes(bs) {
return nil, fmt.Errorf("'%s' returned invalid JSON output", cmd)
}
res := gjson.ParseBytes(bs)
if !res.Get("smartctl.exit_status").Exists() {
return nil, fmt.Errorf("'%s' returned unexpected data", cmd)
}
for _, msg := range res.Get("smartctl.messages").Array() {
if msg.Get("severity").String() == "error" {
return &res, fmt.Errorf("'%s' reported an error: %s", cmd, msg.Get("string"))
}
}
return &res, nil
}
func isExecExitCode(err error, exitCode int) bool {
var v *exec.ExitError
return errors.As(err, &v) && v.ExitCode() == exitCode
}
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