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main.go
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main.go
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/*
* Copyright (c) 2020. Ant Group. All rights reserved.
* Copyright (c) 2022. Nydus Developers. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
package main
import (
"fmt"
"os"
"github.com/containerd/containerd/log"
"github.com/pkg/errors"
"github.com/urfave/cli/v2"
"github.com/containerd/nydus-snapshotter/config"
"github.com/containerd/nydus-snapshotter/internal/flags"
"github.com/containerd/nydus-snapshotter/internal/logging"
"github.com/containerd/nydus-snapshotter/pkg/errdefs"
"github.com/containerd/nydus-snapshotter/version"
)
func main() {
flags := flags.NewFlags()
app := &cli.App{
Name: "containerd-nydus-grpc",
Usage: "Nydus remote snapshotter for containerd",
Version: version.Version,
Flags: flags.F,
HideVersion: true,
Action: func(_ *cli.Context) error {
if flags.Args.PrintVersion {
fmt.Println("Version: ", version.Version)
fmt.Println("Revision: ", version.Revision)
fmt.Println("Go version: ", version.GoVersion)
fmt.Println("Build time: ", version.BuildTimestamp)
return nil
}
snapshotterConfigPath := flags.Args.SnapshotterConfigPath
var defaultSnapshotterConfig config.SnapshotterConfig
var snapshotterConfig config.SnapshotterConfig
if err := defaultSnapshotterConfig.FillUpWithDefaults(); err != nil {
return errors.New("failed to generate nydus default configuration")
}
// Once snapshotter's configuration file is provided, parse it and let command line parameters override it.
if snapshotterConfigPath != "" {
if c, err := config.LoadSnapshotterConfig(snapshotterConfigPath); err == nil {
// Command line parameters override the snapshotter's configurations for backwards compatibility
if err := config.ParseParameters(flags.Args, c); err != nil {
return errors.Wrap(err, "failed to parse commandline options")
}
snapshotterConfig = *c
} else {
return errors.Wrapf(err, "failed to load snapshotter configuration from %q", snapshotterConfigPath)
}
} else {
if err := config.ParseParameters(flags.Args, &snapshotterConfig); err != nil {
return errors.Wrap(err, "failed to parse commandline options")
}
}
if err := config.MergeConfig(&snapshotterConfig, &defaultSnapshotterConfig); err != nil {
return errors.Wrap(err, "failed to merge configurations")
}
if err := config.ValidateConfig(&snapshotterConfig); err != nil {
return errors.Wrapf(err, "failed to validate configurations")
}
if err := config.ProcessConfigurations(&snapshotterConfig); err != nil {
return errors.Wrap(err, "failed to process configurations")
}
if err := config.SetUpEnvironment(&snapshotterConfig); err != nil {
return errors.Wrap(err, "failed to setup environment")
}
ctx := logging.WithContext()
logConfig := &snapshotterConfig.LoggingConfig
logRotateArgs := &logging.RotateLogArgs{
RotateLogMaxSize: logConfig.RotateLogMaxSize,
RotateLogMaxBackups: logConfig.RotateLogMaxBackups,
RotateLogMaxAge: logConfig.RotateLogMaxAge,
RotateLogLocalTime: logConfig.RotateLogLocalTime,
RotateLogCompress: logConfig.RotateLogCompress,
}
if err := logging.SetUp(logConfig.LogLevel, logConfig.LogToStdout, logConfig.LogDir, logRotateArgs); err != nil {
return errors.Wrap(err, "failed to setup logger")
}
log.L.Infof("Start nydus-snapshotter. Version: %s, PID: %d, FsDriver: %s, DaemonMode: %s",
version.Version, os.Getpid(), config.GetFsDriver(), snapshotterConfig.DaemonMode)
return Start(ctx, &snapshotterConfig)
},
}
if err := app.Run(os.Args); err != nil {
if errdefs.IsConnectionClosed(err) {
log.L.Info("nydus-snapshotter exited")
} else {
log.L.WithError(err).Fatal("failed to start nydus-snapshotter")
}
}
}