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zot/pkg/cli/root.go

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package cli
import (
"github.com/anuvu/zot/errors"
"github.com/anuvu/zot/pkg/api"
"github.com/anuvu/zot/pkg/storage"
"github.com/fsnotify/fsnotify"
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"github.com/mitchellh/mapstructure"
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distspec "github.com/opencontainers/distribution-spec/specs-go"
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"github.com/rs/zerolog/log"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
// metadataConfig reports metadata after parsing, which we use to track
// errors.
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func metadataConfig(md *mapstructure.Metadata) viper.DecoderConfigOption {
return func(c *mapstructure.DecoderConfig) {
c.Metadata = md
}
}
func NewRootCmd() *cobra.Command {
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showVersion := false
config := api.NewConfig()
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// "serve"
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serveCmd := &cobra.Command{
Use: "serve <config>",
Aliases: []string{"serve"},
Short: "`serve` stores and distributes OCI images",
Long: "`serve` stores and distributes OCI images",
Run: func(cmd *cobra.Command, args []string) {
if len(args) > 0 {
LoadConfiguration(config, args[0])
}
c := api.NewController(config)
// creates a new file watcher
watcher, err := fsnotify.NewWatcher()
if err != nil {
panic(err)
}
defer watcher.Close()
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done := make(chan bool)
// run watcher
go func() {
go func() {
for {
select {
// watch for events
case event := <-watcher.Events:
if event.Op == fsnotify.Write {
log.Info().Msg("Config file changed, trying to reload accessControl config")
newConfig := api.NewConfig()
LoadConfiguration(newConfig, args[0])
c.Config.AccessControl = newConfig.AccessControl
}
// watch for errors
case err := <-watcher.Errors:
log.Error().Err(err).Msgf("FsNotify error while watching config %s", args[0])
panic(err)
}
}
}()
if err := watcher.Add(args[0]); err != nil {
log.Error().Err(err).Msgf("Error adding config file %s to FsNotify watcher", args[0])
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panic(err)
}
<-done
}()
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if err := c.Run(); err != nil {
panic(err)
}
},
}
verifyCmd := &cobra.Command{
Use: "verify <config>",
Aliases: []string{"verify"},
Short: "`verify` validates a zot config file",
Long: "`verify` validates a zot config file",
Run: func(cmd *cobra.Command, args []string) {
if len(args) > 0 {
config := api.NewConfig()
LoadConfiguration(config, args[0])
log.Info().Msgf("Config file %s is valid", args[0])
}
},
}
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// "garbage-collect"
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gcDelUntagged := false
gcDryRun := false
gcCmd := &cobra.Command{
Use: "garbage-collect <config>",
Aliases: []string{"gc"},
Short: "`garbage-collect` deletes layers not referenced by any manifests",
Long: "`garbage-collect` deletes layers not referenced by any manifests",
Run: func(cmd *cobra.Command, args []string) {
log.Info().Interface("values", config).Msg("configuration settings")
if config.Storage.RootDirectory != "" {
if err := storage.Scrub(config.Storage.RootDirectory, gcDryRun); err != nil {
panic(err)
}
}
},
}
gcCmd.Flags().StringVarP(&config.Storage.RootDirectory, "storage-root-dir", "r", "",
"Use specified directory for filestore backing image data")
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_ = gcCmd.MarkFlagRequired("storage-root-dir")
gcCmd.Flags().BoolVarP(&gcDelUntagged, "delete-untagged", "m", false,
"delete manifests that are not currently referenced via tag")
gcCmd.Flags().BoolVarP(&gcDryRun, "dry-run", "d", false,
"do everything except remove the blobs")
rootCmd := &cobra.Command{
Use: "zot",
Short: "`zot`",
Long: "`zot`",
Run: func(cmd *cobra.Command, args []string) {
if showVersion {
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log.Info().Str("distribution-spec", distspec.Version).Str("commit", api.Commit).
Str("binary-type", api.BinaryType).Msg("version")
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}
_ = cmd.Usage()
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cmd.SilenceErrors = false
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},
}
rootCmd.AddCommand(serveCmd)
rootCmd.AddCommand(gcCmd)
rootCmd.AddCommand(verifyCmd)
enableCli(rootCmd)
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rootCmd.Flags().BoolVarP(&showVersion, "version", "v", false, "show the version and exit")
return rootCmd
}
func LoadConfiguration(config *api.Config, configPath string) {
viper.SetConfigFile(configPath)
if err := viper.ReadInConfig(); err != nil {
log.Error().Err(err).Msg("Error while reading configuration")
panic(err)
}
md := &mapstructure.Metadata{}
if err := viper.Unmarshal(&config, metadataConfig(md)); err != nil {
log.Error().Err(err).Msg("Error while unmarshalling new config")
panic(err)
}
if len(md.Keys) == 0 || len(md.Unused) > 0 {
log.Error().Err(errors.ErrBadConfig).Msg("Bad configuration, retry writing it")
panic(errors.ErrBadConfig)
}
// check authorization config, it should have basic auth enabled or ldap
if config.HTTP.RawAccessControl != nil {
if config.HTTP.Auth == nil || (config.HTTP.Auth.HTPasswd.Path == "" && config.HTTP.Auth.LDAP == nil) {
log.Error().Err(errors.ErrBadConfig).
Msg("access control config requires httpasswd or ldap authentication to be enabled")
panic(errors.ErrBadConfig)
}
}
err := config.LoadAccessControlConfig()
if err != nil {
log.Error().Err(errors.ErrBadConfig).Msg("Unable to unmarshal http.accessControl.key.policies")
panic(err)
}
}