Add configuration for frizbee

.github/workflows/releaser.yml

@@ -89,7 +89,7 @@ jobs:
       actions: read # To read the workflow path.
       id-token: write # To sign the provenance.
       contents: write # To add assets to a release.
-    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@07e64b653f10a80b6510f4568f685f8b7b9ea830 # v1.9.0
+    uses: slsa-framework/slsa-github-generator/.github/workflows/[email protected]
     with:
       base64-subjects: "${{ needs.release.outputs.hashes }}"
       upload-assets: true # upload to a new release

cmd/ghactions/ghactions.go

@@ -22,6 +22,8 @@ import (
 
 	"github.com/google/go-github/v56/github"
 	"github.com/spf13/cobra"
+
+	"github.com/stacklok/frizbee/pkg/config"
 )
 
 // CmdGHActions represents the ghactions command
@@ -70,6 +72,10 @@ func replace(cmd *cobra.Command, _ []string) error {
 	if err != nil {
 		return fmt.Errorf("failed to get quiet flag: %w", err)
 	}
+	cfg, err := config.FromContext(cmd.Context())
+	if err != nil {
+		return fmt.Errorf("failed to get config from context: %w", err)
+	}
 
 	// remove trailing / from dir. This doesn't play well with
 	// the go-billy filesystem and walker we use.
@@ -94,5 +100,5 @@ func replace(cmd *cobra.Command, _ []string) error {
 		errOnModified: errOnModified,
 	}
 
-	return replacer.do(ctx, cmd)
+	return replacer.do(ctx, cmd, cfg)
 }

cmd/ghactions/replacer.go

@@ -29,6 +29,7 @@ import (
 	"github.com/spf13/cobra"
 	"gopkg.in/yaml.v3"
 
+	"github.com/stacklok/frizbee/pkg/config"
 	"github.com/stacklok/frizbee/pkg/ghactions"
 	"github.com/stacklok/frizbee/pkg/utils"
 )
@@ -41,7 +42,7 @@ type replacer struct {
 	errOnModified bool
 }
 
-func (r *replacer) do(ctx context.Context, cmd *cobra.Command) error {
+func (r *replacer) do(ctx context.Context, cmd *cobra.Command, cfg *config.Config) error {
 	basedir := filepath.Dir(r.dir)
 	base := filepath.Base(r.dir)
 	bfs := osfs.New(basedir, osfs.WithBoundOS())
@@ -51,7 +52,7 @@ func (r *replacer) do(ctx context.Context, cmd *cobra.Command) error {
 
 	err := ghactions.TraverseGitHubActionWorkflows(bfs, base, func(path string, wflow *yaml.Node) error {
 		r.logf(cmd, "Processing %s\n", path)
-		m, err := ghactions.ModifyReferencesInYAML(ctx, r.ghcli, wflow)
+		m, err := ghactions.ModifyReferencesInYAML(ctx, r.ghcli, wflow, &cfg.GHActions)
 		if err != nil {
 			return fmt.Errorf("failed to process YAML file %s: %w", path, err)
 		}

cmd/root.go

@@ -18,23 +18,52 @@ package cmd
 
 import (
 	"context"
+	"fmt"
 	"os"
 
 	"github.com/spf13/cobra"
 
 	"github.com/stacklok/frizbee/cmd/ghactions"
+	"github.com/stacklok/frizbee/pkg/config"
 )
 
 // Execute runs the root command.
 func Execute() {
 	var rootCmd = &cobra.Command{
-		Use:   "frizbee",
-		Short: "frizbee is a tool you may throw a tag at and it comes back with a checksum",
+		Use:               "frizbee",
+		Short:             "frizbee is a tool you may throw a tag at and it comes back with a checksum",
+		PersistentPreRunE: prerun,
 	}
 
+	rootCmd.PersistentFlags().StringP("config", "c", ".frizbee.yml", "config file (default is .frizbee.yml)")
+
 	rootCmd.AddCommand(ghactions.CmdGHActions())
-	err := rootCmd.ExecuteContext(context.Background())
-	if err != nil {
+
+	if err := rootCmd.ExecuteContext(context.Background()); err != nil {
 		os.Exit(1)
 	}
 }
+
+func prerun(cmd *cobra.Command, _ []string) error {
+	ctx := cmd.Context()
+
+	cfg, err := readConfig(cmd)
+	if err != nil {
+		return fmt.Errorf("failed to read config: %w", err)
+	}
+
+	ctx = context.WithValue(ctx, config.ContextConfigKey, cfg)
+
+	cmd.SetContext(ctx)
+
+	return nil
+}
+
+func readConfig(cmd *cobra.Command) (*config.Config, error) {
+	configFile, err := cmd.Flags().GetString("config")
+	if err != nil {
+		return nil, fmt.Errorf("failed to get config file: %w", err)
+	}
+
+	return config.ParseConfigFile(configFile)
+}

pkg/config/config.go

@@ -0,0 +1,82 @@
+//
+// Copyright 2023 Stacklok, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package config provides the frizbee configuration.
+package config
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"gopkg.in/yaml.v3"
+)
+
+type contextConfigKey struct{}
+
+// ContextConfigKey is the context key for the configuration.
+// nolint:gochecknoglobals // this is a context key
+var ContextConfigKey = contextConfigKey{}
+
+// FromContext returns the configuration from the context.
+func FromContext(ctx context.Context) (*Config, error) {
+	cfg, ok := ctx.Value(ContextConfigKey).(*Config)
+	if !ok {
+		return nil, fmt.Errorf("failed to get config from context")
+	}
+
+	return cfg, nil
+}
+
+// Config is the frizbee configuration.
+type Config struct {
+	GHActions GHActions `yaml:"ghactions" mapstructure:"ghactions"`
+}
+
+// GHActions is the GitHub Actions configuration.
+type GHActions struct {
+	Filter `yaml:",inline" mapstructure:",inline"`
+}
+
+// Filter is a common configuration for filtering out patterns.
+type Filter struct {
+	// Exclude is a list of patterns to exclude.
+	Exclude []string `yaml:"exclude" mapstructure:"exclude"`
+}
+
+// ParseConfigFile parses a configuration file.
+func ParseConfigFile(configfile string) (*Config, error) {
+	cfg := &Config{}
+	cleancfgfile := filepath.Clean(configfile)
+	cfgF, err := os.Open(cleancfgfile)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return cfg, nil
+		}
+
+		return nil, fmt.Errorf("failed to open config file: %w", err)
+	}
+	// nolint:errcheck // we don't care about the error here
+	defer cfgF.Close()
+
+	dec := yaml.NewDecoder(cfgF)
+
+	if err := dec.Decode(cfg); err != nil {
+		return nil, fmt.Errorf("failed to decode config file: %w", err)
+	}
+
+	return cfg, nil
+}

pkg/ghactions/ghactions.go

@@ -24,6 +24,8 @@ import (
 
 	"github.com/google/go-github/v56/github"
 	"gopkg.in/yaml.v3"
+
+	"github.com/stacklok/frizbee/pkg/config"
 )
 
 // IsLocal returns true if the input is a local path.
@@ -75,7 +77,7 @@ func GetChecksum(ctx context.Context, ghcli *github.Client, action, ref string)
 // all references to tags with the checksum of the tag.
 // Note that the given YAML structure is modified in-place.
 // The function returns true if any references were modified.
-func ModifyReferencesInYAML(ctx context.Context, ghcli *github.Client, node *yaml.Node) (bool, error) {
+func ModifyReferencesInYAML(ctx context.Context, ghcli *github.Client, node *yaml.Node, cfg *config.GHActions) (bool, error) {
 	// `uses` will be immediately before the action
 	// name in the YAML `Content` array. We use a toggle
 	// to track if we've found `uses` and then look for
@@ -97,6 +99,10 @@ func ModifyReferencesInYAML(ctx context.Context, ghcli *github.Client, node *yam
 				continue
 			}
 
+			if shouldExclude(cfg, v.Value) {
+				continue
+			}
+
 			act, ref, err := ParseActionReference(v.Value)
 			if err != nil {
 				return modified, fmt.Errorf("failed to parse action reference '%s': %w", v.Value, err)
@@ -116,7 +122,7 @@ func ModifyReferencesInYAML(ctx context.Context, ghcli *github.Client, node *yam
 		}
 
 		// Otherwise recursively look more
-		m, err := ModifyReferencesInYAML(ctx, ghcli, v)
+		m, err := ModifyReferencesInYAML(ctx, ghcli, v, cfg)
 		if err != nil {
 			return m, err
 		}
@@ -182,3 +188,12 @@ func parseValue(val string) (*Action, error) {
 		Ref:   ref,
 	}, nil
 }
+
+func shouldExclude(cfg *config.GHActions, input string) bool {
+	for _, e := range cfg.Exclude {
+		if e == input {
+			return true
+		}
+	}
+	return false
+}