clairctl: command to add the relevant config options for disconnected

Adding a command that can create a new drop-in config with the relevant
disconnected settings in-place. You can also specify where the red hat
indexing files are located.

Signed-off-by: crozzy <joseph.crosland@gmail.com>

cmd/clairctl/disconnected.go

@@ -0,0 +1,117 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/urfave/cli/v2"
+	"gopkg.in/yaml.v3"
+)
+
+// DisconnectedCmd is the "disconnected" subcommand.
+var DisconnectedCmd = &cli.Command{
+	Name:      "disconnected",
+	Action:    disconnectedAction,
+	Usage:     "add disconnected config drop-in",
+	ArgsUsage: "",
+	Flags: []cli.Flag{
+		&cli.StringFlag{
+			Name:    "red-hat-repo-to-cpe-file-path",
+			Usage:   "file path for the Red Hat repo-cpe-map data.",
+			Value:   "",
+			EnvVars: []string{"RED_HAT_REPO_TO_CPE_FILE_PATH"},
+		},
+		&cli.StringFlag{
+			Name:    "red-hat-container-to-repos-file-path",
+			Usage:   "file path for the Red Hat container-to-repos data.",
+			Value:   "",
+			EnvVars: []string{"RED_HAT_CONTAINER_TO_REPOS_FILE_PATH"},
+		},
+		&cli.BoolFlag{
+			Name:    "dry-run",
+			Aliases: []string{"d"},
+			Usage:   "just print out drop-in.",
+		},
+	},
+	Description: `Adds drop-in config for disconnected environments`,
+}
+
+type disconnectedCfgDropin struct {
+	Indexer struct {
+		Airgap  bool `json:"airgap" yaml:"airgap"`
+		Scanner struct {
+			Package struct {
+				RHELContainerScanner map[string]string `json:"rhel_containerscanner" yaml:"rhel_containerscanner"`
+			} `yaml:"package,omitempty" json:"package,omitempty"`
+			Repo struct {
+				RHELRepositoryScanner map[string]string `json:"rhel-repository-scanner" yaml:"rhel-repository-scanner"`
+			} `yaml:"repo,omitempty" json:"repo,omitempty"`
+		} `yaml:"scanner,omitempty" json:"scanner,omitempty"`
+	} `yaml:"indexer,omitempty" json:"indexer,omitempty"`
+	Matcher struct {
+		DisableUpdaters bool `yaml:"disable_updaters,omitempty" json:"disable_updaters,omitempty"`
+	}
+}
+
+func disconnectedAction(c *cli.Context) error {
+	repoCPEMapFile := c.String("red-hat-repo-to-cpe-file-path")
+	containerRepoMapFile := c.String("red-hat-container-to-repos-file-path")
+
+	newConf := &disconnectedCfgDropin{}
+	if repoCPEMapFile == "" {
+		return errors.New("could not find repo to CPE file, either specify with --red-hat-repo-to-cpe-file-path or RED_HAT_REPO_TO_CPE_FILE_PATH")
+	}
+	if containerRepoMapFile == "" {
+		return errors.New("could not find container to repos file, either specify with --red-hat-container-to-repos-file-path or RED_HAT_CONTAINER_TO_REPOS_FILE_PATH")
+
+	}
+
+	newConf.Indexer.Scanner.Repo.RHELRepositoryScanner = map[string]string{"repo2cpe_mapping_file": repoCPEMapFile}
+	newConf.Indexer.Scanner.Package.RHELContainerScanner = map[string]string{"name2repos_mapping_file": containerRepoMapFile}
+	newConf.Indexer.Airgap = true
+	newConf.Matcher.DisableUpdaters = true
+
+	cfgPath := c.Path("config")
+	var (
+		dropinPath string
+		dropinData []byte
+		err        error
+	)
+	switch {
+	case strings.HasSuffix(cfgPath, ".json"):
+		dropinPath = filepath.Join(cfgPath+".d", "disconnected.json")
+		if dropinData, err = json.Marshal(newConf); err != nil {
+			return err
+		}
+	case strings.HasSuffix(cfgPath, ".yaml"):
+		dropinPath = filepath.Join(cfgPath+".d", "disconnected.yaml")
+		if dropinData, err = yaml.Marshal(newConf); err != nil {
+			return err
+		}
+	default:
+		return errors.New("unknown config format, file is neither .yaml or .json")
+	}
+	if err := os.MkdirAll(filepath.Dir(dropinPath), 0o755); err != nil {
+		return fmt.Errorf("unable to create needed directories: %v", err)
+	}
+	if c.Bool("dry-run") {
+		os.Stdout.Write(dropinData)
+		return nil
+	} else {
+		f, err := os.Create(dropinPath)
+		if err != nil {
+			return err
+		}
+		defer f.Close()
+
+		if _, err = f.Write(dropinData); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

cmd/clairctl/main.go

@@ -58,6 +58,7 @@ func main() {
 			DeleteCmd,
 			CheckConfigCmd,
 			AdminCmd,
+			DisconnectedCmd,
 		},
 		Flags: []cli.Flag{
 			&cli.BoolFlag{