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package libpod
import (
"fmt"
"os"
"os/exec"
"strings"
"github.com/coreos/go-systemd/dbus"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// createTimer systemd timers for healthchecks of a container
func (c *Container) createTimer() error {
if c.disableHealthCheckSystemd() {
return nil
}
podman, err := os.Executable()
if err != nil {
return errors.Wrapf(err, "failed to get path for podman for a health check timer")
}
var cmd = []string{"--unit", fmt.Sprintf("%s", c.ID()), fmt.Sprintf("--on-unit-inactive=%s", c.HealthCheckConfig().Interval.String()), "--timer-property=AccuracySec=1s", podman, "healthcheck", "run", c.ID()}
conn, err := dbus.NewSystemdConnection()
if err != nil {
return errors.Wrapf(err, "unable to get systemd connection to add healthchecks")
}
conn.Close()
logrus.Debugf("creating systemd-transient files: %s %s", "systemd-run", cmd)
systemdRun := exec.Command("systemd-run", cmd...)
_, err = systemdRun.CombinedOutput()
if err != nil {
return err
}
return nil
}
// startTimer starts a systemd timer for the healthchecks
func (c *Container) startTimer() error {
if c.disableHealthCheckSystemd() {
return nil
}
conn, err := dbus.NewSystemdConnection()
if err != nil {
return errors.Wrapf(err, "unable to get systemd connection to start healthchecks")
}
defer conn.Close()
_, err = conn.StartUnit(fmt.Sprintf("%s.service", c.ID()), "fail", nil)
return err
}
// removeTimer removes the systemd timer and unit files
// for the container
func (c *Container) removeTimer() error {
if c.disableHealthCheckSystemd() {
return nil
}
conn, err := dbus.NewSystemdConnection()
if err != nil {
return errors.Wrapf(err, "unable to get systemd connection to remove healthchecks")
}
defer conn.Close()
timerFile := fmt.Sprintf("%s.timer", c.ID())
_, err = conn.StopUnit(timerFile, "fail", nil)
// We want to ignore errors where the timer unit has already been removed. The error
// return is generic so we have to check against the string in the error
if err != nil && strings.HasSuffix(err.Error(), ".timer not loaded.") {
return nil
}
return err
}
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