mirror of
https://github.com/containrrr/watchtower.git
synced 2024-12-12 09:04:17 +02:00
299 lines
7.9 KiB
Go
299 lines
7.9 KiB
Go
package main // import "github.com/v2tec/watchtower"
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import (
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"os"
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"os/signal"
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"syscall"
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"time"
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"strconv"
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"github.com/robfig/cron"
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log "github.com/sirupsen/logrus"
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"github.com/urfave/cli"
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"github.com/v2tec/watchtower/actions"
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"github.com/v2tec/watchtower/container"
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"github.com/v2tec/watchtower/notifications"
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)
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// DockerAPIMinVersion is the version of the docker API, which is minimally required by
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// watchtower. Currently we require at least API 1.24 and therefore Docker 1.12 or later.
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const DockerAPIMinVersion string = "1.24"
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var version = "master"
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var commit = "unknown"
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var date = "unknown"
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var (
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client container.Client
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scheduleSpec string
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cleanup bool
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noRestart bool
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enableLabel bool
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notifier *notifications.Notifier
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timeout time.Duration
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)
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func init() {
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log.SetLevel(log.InfoLevel)
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}
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func main() {
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app := cli.NewApp()
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app.Name = "watchtower"
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app.Version = version + " - " + commit + " - " + date
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app.Usage = "Automatically update running Docker containers"
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app.Before = before
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app.Action = start
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app.Flags = []cli.Flag{
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cli.StringFlag{
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Name: "host, H",
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Usage: "daemon socket to connect to",
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Value: "unix:///var/run/docker.sock",
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EnvVar: "DOCKER_HOST",
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},
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cli.IntFlag{
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Name: "interval, i",
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Usage: "poll interval (in seconds)",
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Value: 300,
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EnvVar: "WATCHTOWER_POLL_INTERVAL",
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},
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cli.StringFlag{
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Name: "schedule, s",
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Usage: "the cron expression which defines when to update",
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EnvVar: "WATCHTOWER_SCHEDULE",
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},
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cli.BoolFlag{
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Name: "no-pull",
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Usage: "do not pull new images",
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EnvVar: "WATCHTOWER_NO_PULL",
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},
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cli.BoolFlag{
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Name: "no-restart",
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Usage: "do not restart containers",
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EnvVar: "WATCHTOWER_NO_RESTART",
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},
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cli.BoolFlag{
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Name: "cleanup",
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Usage: "remove old images after updating",
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EnvVar: "WATCHTOWER_CLEANUP",
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},
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cli.BoolFlag{
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Name: "tlsverify",
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Usage: "use TLS and verify the remote",
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EnvVar: "DOCKER_TLS_VERIFY",
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},
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cli.DurationFlag{
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Name: "stop-timeout",
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Usage: "timeout before container is forcefully stopped",
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Value: time.Second * 10,
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EnvVar: "WATCHTOWER_TIMEOUT",
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},
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cli.BoolFlag{
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Name: "label-enable",
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Usage: "watch containers where the com.centurylinklabs.watchtower.enable label is true",
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EnvVar: "WATCHTOWER_LABEL_ENABLE",
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},
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cli.BoolFlag{
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Name: "debug",
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Usage: "enable debug mode with verbose logging",
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},
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cli.StringSliceFlag{
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Name: "notifications",
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Value: &cli.StringSlice{},
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Usage: "notification types to send (valid: email, slack, msteams)",
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EnvVar: "WATCHTOWER_NOTIFICATIONS",
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},
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cli.StringFlag{
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Name: "notifications-level",
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Usage: "The log level used for sending notifications. Possible values: \"panic\", \"fatal\", \"error\", \"warn\", \"info\" or \"debug\"",
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EnvVar: "WATCHTOWER_NOTIFICATIONS_LEVEL",
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Value: "info",
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},
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cli.StringFlag{
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Name: "notification-email-from",
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Usage: "Address to send notification e-mails from",
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EnvVar: "WATCHTOWER_NOTIFICATION_EMAIL_FROM",
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},
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cli.StringFlag{
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Name: "notification-email-to",
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Usage: "Address to send notification e-mails to",
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EnvVar: "WATCHTOWER_NOTIFICATION_EMAIL_TO",
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},
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cli.StringFlag{
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Name: "notification-email-server",
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Usage: "SMTP server to send notification e-mails through",
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EnvVar: "WATCHTOWER_NOTIFICATION_EMAIL_SERVER",
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},
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cli.IntFlag{
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Name: "notification-email-server-port",
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Usage: "SMTP server port to send notification e-mails through",
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Value: 25,
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EnvVar: "WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PORT",
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},
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cli.BoolFlag{
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Name: "notification-email-server-tls-skip-verify",
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Usage: "Controls whether watchtower verifies the SMTP server's certificate chain and host name. " +
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"If set, TLS accepts any certificate " +
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"presented by the server and any host name in that certificate. " +
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"In this mode, TLS is susceptible to man-in-the-middle attacks. " +
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"This should be used only for testing.",
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EnvVar: "WATCHTOWER_NOTIFICATION_EMAIL_SERVER_TLS_SKIP_VERIFY",
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},
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cli.StringFlag{
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Name: "notification-email-server-user",
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Usage: "SMTP server user for sending notifications",
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EnvVar: "WATCHTOWER_NOTIFICATION_EMAIL_SERVER_USER",
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},
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cli.StringFlag{
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Name: "notification-email-server-password",
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Usage: "SMTP server password for sending notifications",
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EnvVar: "WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD",
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},
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cli.StringFlag{
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Name: "notification-slack-hook-url",
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Usage: "The Slack Hook URL to send notifications to",
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EnvVar: "WATCHTOWER_NOTIFICATION_SLACK_HOOK_URL",
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},
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cli.StringFlag{
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Name: "notification-slack-identifier",
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Usage: "A string which will be used to identify the messages coming from this watchtower instance. Default if omitted is \"watchtower\"",
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EnvVar: "WATCHTOWER_NOTIFICATION_SLACK_IDENTIFIER",
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Value: "watchtower",
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},
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cli.StringFlag{
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Name: "notification-msteams-hook",
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Usage: "The MSTeams WebHook URL to send notifications to",
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EnvVar: "WATCHTOWER_NOTIFICATION_MSTEAMS_HOOK_URL",
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},
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cli.BoolFlag{
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Name: "notification-msteams-data",
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Usage: "The MSTeams notifier will try to extract log entry fields as MSTeams message facts",
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EnvVar: "WATCHTOWER_NOTIFICATION_MSTEAMS_USE_LOG_DATA",
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},
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}
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if err := app.Run(os.Args); err != nil {
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log.Fatal(err)
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}
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}
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func before(c *cli.Context) error {
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if c.GlobalBool("debug") {
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log.SetLevel(log.DebugLevel)
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}
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pollingSet := c.IsSet("interval")
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cronSet := c.IsSet("schedule")
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if pollingSet && cronSet {
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log.Fatal("Only schedule or interval can be defined, not both.")
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} else if cronSet {
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scheduleSpec = c.String("schedule")
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} else {
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scheduleSpec = "@every " + strconv.Itoa(c.Int("interval")) + "s"
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}
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cleanup = c.GlobalBool("cleanup")
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noRestart = c.GlobalBool("no-restart")
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timeout = c.GlobalDuration("stop-timeout")
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if timeout < 0 {
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log.Fatal("Please specify a positive value for timeout value.")
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}
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enableLabel = c.GlobalBool("label-enable")
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// configure environment vars for client
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err := envConfig(c)
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if err != nil {
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return err
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}
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client = container.NewClient(!c.GlobalBool("no-pull"))
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notifier = notifications.NewNotifier(c)
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return nil
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}
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func start(c *cli.Context) error {
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names := c.Args()
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if err := actions.CheckPrereqs(client, cleanup); err != nil {
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log.Fatal(err)
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}
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filter := container.BuildFilter(names, enableLabel)
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tryLockSem := make(chan bool, 1)
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tryLockSem <- true
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cron := cron.New()
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err := cron.AddFunc(
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scheduleSpec,
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func() {
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select {
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case v := <-tryLockSem:
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defer func() { tryLockSem <- v }()
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notifier.StartNotification()
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if err := actions.Update(client, filter, cleanup, noRestart, timeout); err != nil {
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log.Println(err)
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}
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notifier.SendNotification()
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default:
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log.Debug("Skipped another update already running.")
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}
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nextRuns := cron.Entries()
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if len(nextRuns) > 0 {
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log.Debug("Scheduled next run: " + nextRuns[0].Next.String())
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}
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})
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if err != nil {
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return err
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}
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log.Info("First run: " + cron.Entries()[0].Schedule.Next(time.Now()).String())
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cron.Start()
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// Graceful shut-down on SIGINT/SIGTERM
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interrupt := make(chan os.Signal, 1)
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signal.Notify(interrupt, os.Interrupt)
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signal.Notify(interrupt, syscall.SIGTERM)
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<-interrupt
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cron.Stop()
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log.Info("Waiting for running update to be finished...")
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<-tryLockSem
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os.Exit(1)
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return nil
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}
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func setEnvOptStr(env string, opt string) error {
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if opt != "" && opt != os.Getenv(env) {
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err := os.Setenv(env, opt)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func setEnvOptBool(env string, opt bool) error {
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if opt == true {
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return setEnvOptStr(env, "1")
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}
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return nil
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}
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// envConfig translates the command-line options into environment variables
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// that will initialize the api client
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func envConfig(c *cli.Context) error {
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var err error
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err = setEnvOptStr("DOCKER_HOST", c.GlobalString("host"))
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err = setEnvOptBool("DOCKER_TLS_VERIFY", c.GlobalBool("tlsverify"))
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err = setEnvOptStr("DOCKER_API_VERSION", DockerAPIMinVersion)
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return err
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}
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