mirror of
https://github.com/anchore/syft.git
synced 2025-11-17 08:23:15 +01:00
251 lines
9.4 KiB
Go
251 lines
9.4 KiB
Go
package config
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import (
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"errors"
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"fmt"
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"path"
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"reflect"
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"strings"
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"github.com/adrg/xdg"
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"github.com/anchore/syft/internal"
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"github.com/mitchellh/go-homedir"
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"github.com/sirupsen/logrus"
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"github.com/spf13/viper"
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"gopkg.in/yaml.v2"
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)
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var ErrApplicationConfigNotFound = fmt.Errorf("application config not found")
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var catalogerEnabledDefault = false
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type defaultValueLoader interface {
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loadDefaultValues(*viper.Viper)
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}
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type parser interface {
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parseConfigValues() error
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}
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// Application is the main syft application configuration.
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type Application struct {
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ConfigPath string `yaml:",omitempty" json:"configPath"` // the location where the application config was read from (either from -c or discovered while loading)
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Output string `yaml:"output" json:"output" mapstructure:"output"` // -o, the Presenter hint string to use for report formatting
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File string `yaml:"file" json:"file" mapstructure:"file"` // --file, the file to write report output to
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Quiet bool `yaml:"quiet" json:"quiet" mapstructure:"quiet"` // -q, indicates to not show any status output to stderr (ETUI or logging UI)
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CheckForAppUpdate bool `yaml:"check-for-app-update" json:"check-for-app-update" mapstructure:"check-for-app-update"` // whether to check for an application update on start up or not
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Anchore anchore `yaml:"anchore" json:"anchore" mapstructure:"anchore"` // options for interacting with Anchore Engine/Enterprise
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CliOptions CliOnlyOptions `yaml:"-" json:"-"` // all options only available through the CLI (not via env vars or config)
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Dev development `yaml:"dev" json:"dev" mapstructure:"dev"`
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Log logging `yaml:"log" json:"log" mapstructure:"log"` // all logging-related options
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Package packages `yaml:"package" json:"package" mapstructure:"package"`
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FileMetadata FileMetadata `yaml:"file-metadata" json:"file-metadata" mapstructure:"file-metadata"`
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FileClassification fileClassification `yaml:"file-classification" json:"file-classification" mapstructure:"file-classification"`
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FileContents fileContents `yaml:"file-contents" json:"file-contents" mapstructure:"file-contents"`
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Secrets secrets `yaml:"secrets" json:"secrets" mapstructure:"secrets"`
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Registry registry `yaml:"registry" json:"registry" mapstructure:"registry"`
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Exclusions []string `yaml:"exclude" json:"exclude" mapstructure:"exclude"`
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}
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// PowerUserCatalogerEnabledDefault switches all catalogers to be enabled when running power-user command
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func PowerUserCatalogerEnabledDefault() {
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catalogerEnabledDefault = true
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}
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func newApplicationConfig(v *viper.Viper, cliOpts CliOnlyOptions) *Application {
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config := &Application{
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CliOptions: cliOpts,
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}
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config.loadDefaultValues(v)
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return config
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}
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// LoadApplicationConfig populates the given viper object with application configuration discovered on disk
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func LoadApplicationConfig(v *viper.Viper, cliOpts CliOnlyOptions) (*Application, error) {
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// the user may not have a config, and this is OK, we can use the default config + default cobra cli values instead
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config := newApplicationConfig(v, cliOpts)
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if err := readConfig(v, cliOpts.ConfigPath); err != nil && !errors.Is(err, ErrApplicationConfigNotFound) {
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return nil, err
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}
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if err := v.Unmarshal(config); err != nil {
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return nil, fmt.Errorf("unable to parse config: %w", err)
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}
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config.ConfigPath = v.ConfigFileUsed()
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if err := config.parseConfigValues(); err != nil {
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return nil, fmt.Errorf("invalid application config: %w", err)
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}
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return config, nil
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}
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// init loads the default configuration values into the viper instance (before the config values are read and parsed).
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func (cfg Application) loadDefaultValues(v *viper.Viper) {
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// set the default values for primitive fields in this struct
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v.SetDefault("check-for-app-update", true)
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// for each field in the configuration struct, see if the field implements the defaultValueLoader interface and invoke it if it does
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value := reflect.ValueOf(cfg)
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for i := 0; i < value.NumField(); i++ {
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// note: the defaultValueLoader method receiver is NOT a pointer receiver.
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if loadable, ok := value.Field(i).Interface().(defaultValueLoader); ok {
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// the field implements defaultValueLoader, call it
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loadable.loadDefaultValues(v)
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}
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}
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}
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func (cfg *Application) parseConfigValues() error {
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// parse application config options
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for _, optionFn := range []func() error{
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cfg.parseUploadOptions,
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cfg.parseLogLevelOption,
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} {
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if err := optionFn(); err != nil {
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return err
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}
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}
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// parse nested config options
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// for each field in the configuration struct, see if the field implements the parser interface
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// note: the app config is a pointer, so we need to grab the elements explicitly (to traverse the address)
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value := reflect.ValueOf(cfg).Elem()
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for i := 0; i < value.NumField(); i++ {
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// note: since the interface method of parser is a pointer receiver we need to get the value of the field as a pointer.
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if parsable, ok := value.Field(i).Addr().Interface().(parser); ok {
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// the field implements parser, call it
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if err := parsable.parseConfigValues(); err != nil {
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return err
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}
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}
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}
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return nil
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}
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func (cfg *Application) parseUploadOptions() error {
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if cfg.Anchore.Host == "" && cfg.Anchore.Dockerfile != "" {
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return fmt.Errorf("cannot provide dockerfile option without enabling upload")
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}
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return nil
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}
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func (cfg *Application) parseLogLevelOption() error {
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switch {
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case cfg.Quiet:
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// TODO: this is bad: quiet option trumps all other logging options (such as to a file on disk)
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// we should be able to quiet the console logging and leave file logging alone...
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// ... this will be an enhancement for later
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cfg.Log.LevelOpt = logrus.PanicLevel
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case cfg.Log.Level != "":
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if cfg.CliOptions.Verbosity > 0 {
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return fmt.Errorf("cannot explicitly set log level (cfg file or env var) and use -v flag together")
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}
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lvl, err := logrus.ParseLevel(strings.ToLower(cfg.Log.Level))
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if err != nil {
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return fmt.Errorf("bad log level configured (%q): %w", cfg.Log.Level, err)
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}
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cfg.Log.LevelOpt = lvl
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if cfg.Log.LevelOpt >= logrus.InfoLevel {
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cfg.CliOptions.Verbosity = 1
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}
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default:
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switch v := cfg.CliOptions.Verbosity; {
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case v == 1:
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cfg.Log.LevelOpt = logrus.InfoLevel
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case v >= 2:
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cfg.Log.LevelOpt = logrus.DebugLevel
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default:
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cfg.Log.LevelOpt = logrus.ErrorLevel
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}
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}
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if cfg.Log.Level == "" {
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cfg.Log.Level = cfg.Log.LevelOpt.String()
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}
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return nil
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}
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func (cfg Application) String() string {
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// yaml is pretty human friendly (at least when compared to json)
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appCfgStr, err := yaml.Marshal(&cfg)
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if err != nil {
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return err.Error()
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}
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return string(appCfgStr)
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}
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// readConfig attempts to read the given config path from disk or discover an alternate store location
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// nolint:funlen
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func readConfig(v *viper.Viper, configPath string) error {
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var err error
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v.AutomaticEnv()
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v.SetEnvPrefix(internal.ApplicationName)
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// allow for nested options to be specified via environment variables
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// e.g. pod.context = APPNAME_POD_CONTEXT
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v.SetEnvKeyReplacer(strings.NewReplacer(".", "_", "-", "_"))
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// use explicitly the given user config
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if configPath != "" {
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v.SetConfigFile(configPath)
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if err := v.ReadInConfig(); err != nil {
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return fmt.Errorf("unable to read application config=%q : %w", configPath, err)
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}
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// don't fall through to other options if the config path was explicitly provided
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return nil
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}
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// start searching for valid configs in order...
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// 1. look for .<appname>.yaml (in the current directory)
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v.AddConfigPath(".")
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v.SetConfigName("." + internal.ApplicationName)
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if err = v.ReadInConfig(); err == nil {
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return nil
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} else if !errors.As(err, &viper.ConfigFileNotFoundError{}) {
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return fmt.Errorf("unable to parse config=%q: %w", v.ConfigFileUsed(), err)
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}
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// 2. look for .<appname>/config.yaml (in the current directory)
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v.AddConfigPath("." + internal.ApplicationName)
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v.SetConfigName("config")
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if err = v.ReadInConfig(); err == nil {
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return nil
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} else if !errors.As(err, &viper.ConfigFileNotFoundError{}) {
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return fmt.Errorf("unable to parse config=%q: %w", v.ConfigFileUsed(), err)
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}
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// 3. look for ~/.<appname>.yaml
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home, err := homedir.Dir()
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if err == nil {
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v.AddConfigPath(home)
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v.SetConfigName("." + internal.ApplicationName)
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if err = v.ReadInConfig(); err == nil {
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return nil
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} else if !errors.As(err, &viper.ConfigFileNotFoundError{}) {
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return fmt.Errorf("unable to parse config=%q: %w", v.ConfigFileUsed(), err)
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}
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}
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// 4. look for <appname>/config.yaml in xdg locations (starting with xdg home config dir, then moving upwards)
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v.AddConfigPath(path.Join(xdg.ConfigHome, internal.ApplicationName))
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for _, dir := range xdg.ConfigDirs {
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v.AddConfigPath(path.Join(dir, internal.ApplicationName))
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}
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v.SetConfigName("config")
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if err = v.ReadInConfig(); err == nil {
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return nil
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} else if !errors.As(err, &viper.ConfigFileNotFoundError{}) {
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return fmt.Errorf("unable to parse config=%q: %w", v.ConfigFileUsed(), err)
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}
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return ErrApplicationConfigNotFound
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}
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