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package libpod
import (
"context"
"fmt"
"os"
"os/exec"
"strings"
"github.com/containers/podman/v4/pkg/rootless"
"github.com/containers/podman/v4/pkg/systemd"
"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{}
if rootless.IsRootless() {
cmd = append(cmd, "--user")
}
path := os.Getenv("PATH")
if path != "" {
cmd = append(cmd, "--setenv=PATH="+path)
}
cmd = append(cmd, "--unit", c.ID(), fmt.Sprintf("--on-unit-inactive=%s", c.HealthCheckConfig().Interval.String()), "--timer-property=AccuracySec=1s", podman, "healthcheck", "run", c.ID())
conn, err := systemd.ConnectToDBUS()
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...)
if output, err := systemdRun.CombinedOutput(); err != nil {
return errors.Errorf("%s", output)
}
return nil
}
// startTimer starts a systemd timer for the healthchecks
func (c *Container) startTimer() error {
if c.disableHealthCheckSystemd() {
return nil
}
conn, err := systemd.ConnectToDBUS()
if err != nil {
return errors.Wrapf(err, "unable to get systemd connection to start healthchecks")
}
defer conn.Close()
_, err = conn.StartUnitContext(context.Background(), fmt.Sprintf("%s.service", c.ID()), "fail", nil)
return err
}
// removeTransientFiles removes the systemd timer and unit files
// for the container
func (c *Container) removeTransientFiles(ctx context.Context) error {
if c.disableHealthCheckSystemd() {
return nil
}
conn, err := systemd.ConnectToDBUS()
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())
serviceFile := fmt.Sprintf("%s.service", c.ID())
// If the service has failed (the healthcheck has failed), then
// the .service file is not removed on stopping the unit file. If
// we check the properties of the service, it will automatically
// reset the state. But checking the state takes msecs vs usecs to
// blindly call reset.
if err := conn.ResetFailedUnitContext(ctx, serviceFile); err != nil {
logrus.Debugf("failed to reset unit file: %q", err)
}
// We want to ignore errors where the timer unit and/or service unit has already
// been removed. The error return is generic so we have to check against the
// string in the error
if _, err = conn.StopUnitContext(ctx, serviceFile, "fail", nil); err != nil {
if !strings.HasSuffix(err.Error(), ".service not loaded.") {
return errors.Wrapf(err, "unable to remove service file")
}
}
if _, err = conn.StopUnitContext(ctx, timerFile, "fail", nil); err != nil {
if strings.HasSuffix(err.Error(), ".timer not loaded.") {
return nil
}
}
return err
}
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