/
docker.go
124 lines (108 loc) · 3.51 KB
/
docker.go
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package main
import (
"fmt"
"os"
"github.com/docker/docker/cli"
"github.com/docker/docker/daemon/config"
"github.com/docker/docker/dockerversion"
"github.com/docker/docker/pkg/jsonmessage"
"github.com/docker/docker/pkg/reexec"
"github.com/docker/docker/rootless"
"github.com/moby/buildkit/util/apicaps"
"github.com/moby/term"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
var (
honorXDG bool
)
// 初始化一个 Docker Daemon CMD 实例
func newDaemonCommand() (*cobra.Command, error) {
opts := newDaemonOptions(config.New())
// 构建一个 docker daemon cmd 实例
cmd := &cobra.Command{
Use: "dockerd [OPTIONS]",
Short: "A self-sufficient runtime for containers.",
SilenceUsage: true,
SilenceErrors: true,
Args: cli.NoArgs,
// todo 回调方法, daemon 的主入口
RunE: func(cmd *cobra.Command, args []string) error {
opts.flags = cmd.Flags()
return runDaemon(opts)
},
DisableFlagsInUseLine: true,
Version: fmt.Sprintf("%s, build %s", dockerversion.Version, dockerversion.GitCommit),
}
cli.SetupRootCommand(cmd)
flags := cmd.Flags()
flags.BoolP("version", "v", false, "Print version information and quit")
defaultDaemonConfigFile, err := getDefaultDaemonConfigFile()
if err != nil {
return nil, err
}
flags.StringVar(&opts.configFile, "config-file", defaultDaemonConfigFile, "Daemon configuration file")
opts.InstallFlags(flags)
if err := installConfigFlags(opts.daemonConfig, flags); err != nil {
return nil, err
}
installServiceFlags(flags)
return cmd, nil
}
func init() {
if dockerversion.ProductName != "" {
apicaps.ExportedProduct = dockerversion.ProductName
}
// When running with RootlessKit, $XDG_RUNTIME_DIR, $XDG_DATA_HOME, and $XDG_CONFIG_HOME needs to be
// honored as the default dirs, because we are unlikely to have permissions to access the system-wide
// directories.
//
// Note that even running with --rootless, when not running with RootlessKit, honorXDG needs to be kept false,
// because the system-wide directories in the current mount namespace are expected to be accessible.
// ("rootful" dockerd in rootless dockerd, #38702)
//
//
// 当与RootlessKit一起运行时, `$XDG_RUNTIME_DIR`,
// `$XDG_DATA_HOME` 和`$XDG_CONFIG_HOME` 必须作为默认目录,
// 因为我们不太可能具有访问系统级目录的权限.
//
//
// todo 请注意, 即使使用 `--rootless` 运行,
// 如果不使用RootlessKit也不运行,
// 则 `honorXDG` 也必须保持为false,
// 因为当前安装命名空间中的系统级目录都可以访问.
// (无根dockerd中的 "有根" dockerd, #38702)
honorXDG = rootless.RunningWithRootlessKit()
}
// todo dockker 的入口
func main() {
if reexec.Init() {
return
}
// initial log formatting; this setting is updated after the daemon configuration is loaded.
//
// 初始日志格式; 加载 daemon程序配置后,此设置将更新.
logrus.SetFormatter(&logrus.TextFormatter{
TimestampFormat: jsonmessage.RFC3339NanoFixed,
FullTimestamp: true,
})
// Set terminal emulation based on platform as required.
//
// 根据需要设置基于平台的终端仿真。
_, stdout, stderr := term.StdStreams()
initLogging(stdout, stderr)
onError := func(err error) {
fmt.Fprintf(stderr, "%s\n", err)
os.Exit(1)
}
// todo 初始化一个 Docker Daemon CMD 实例
cmd, err := newDaemonCommand()
if err != nil {
onError(err)
}
cmd.SetOut(stdout)
// todo 启动 Docker Daemon
if err := cmd.Execute(); err != nil {
onError(err)
}
}