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package libpod
import (
"context"
"fmt"
"os"
"os/exec"
"strings"
"github.com/containers/podman/v4/pkg/errorhandling"
"github.com/containers/podman/v4/pkg/rootless"
"github.com/containers/podman/v4/pkg/systemd"
"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 fmt.Errorf("failed to get path for podman for a health check timer: %w", err)
}
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 fmt.Errorf("unable to get systemd connection to add healthchecks: %w", err)
}
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 fmt.Errorf("%s", output)
}
return nil
}
// Wait for a message on the channel. Throw an error if the message is not "done".
func systemdOpSuccessful(c chan string) error {
msg := <-c
switch msg {
case "done":
return nil
default:
return fmt.Errorf("expected %q but received %q", "done", msg)
}
}
// 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 fmt.Errorf("unable to get systemd connection to start healthchecks: %w", err)
}
defer conn.Close()
startFile := fmt.Sprintf("%s.service", c.ID())
startChan := make(chan string)
if _, err := conn.StartUnitContext(context.Background(), startFile, "fail", startChan); err != nil {
return err
}
if err := systemdOpSuccessful(startChan); err != nil {
return fmt.Errorf("starting systemd health-check timer %q: %w", startFile, err)
}
return nil
}
// 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 fmt.Errorf("unable to get systemd connection to remove healthchecks: %w", err)
}
defer conn.Close()
// Errors are returned at the very end. Let's make sure to stop and
// clean up as much as possible.
stopErrors := []error{}
// Stop the timer before the service to make sure the timer does not
// fire after the service is stopped.
timerChan := make(chan string)
timerFile := fmt.Sprintf("%s.timer", c.ID())
if _, err := conn.StopUnitContext(ctx, timerFile, "fail", timerChan); err != nil {
if !strings.HasSuffix(err.Error(), ".timer not loaded.") {
stopErrors = append(stopErrors, fmt.Errorf("removing health-check timer %q: %w", timerFile, err))
}
} else if err := systemdOpSuccessful(timerChan); err != nil {
stopErrors = append(stopErrors, fmt.Errorf("stopping systemd health-check timer %q: %w", timerFile, err))
}
// Reset the service before stopping it to make sure it's being removed
// on stop.
serviceChan := make(chan string)
serviceFile := fmt.Sprintf("%s.service", c.ID())
if err := conn.ResetFailedUnitContext(ctx, serviceFile); err != nil {
logrus.Debugf("Failed to reset unit file: %q", err)
}
if _, err := conn.StopUnitContext(ctx, serviceFile, "fail", serviceChan); err != nil {
if !strings.HasSuffix(err.Error(), ".service not loaded.") {
stopErrors = append(stopErrors, fmt.Errorf("removing health-check service %q: %w", serviceFile, err))
}
} else if err := systemdOpSuccessful(serviceChan); err != nil {
stopErrors = append(stopErrors, fmt.Errorf("stopping systemd health-check service %q: %w", serviceFile, err))
}
return errorhandling.JoinErrors(stopErrors)
}
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