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query.go
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query.go
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// Copyright 2023 Chainguard, 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 cli
import (
"context"
"fmt"
"os"
"text/template"
"chainguard.dev/melange/pkg/config"
"github.com/spf13/cobra"
)
func Query() *cobra.Command {
cmd := &cobra.Command{
Use: "query",
Short: "Query a Melange YAML file for information",
Long: `Query a Melange YAML file for information.
Uses templates with go templates syntax to query the YAML file.`,
Example: ` melange query config.yaml "{{ .Package.Name }}-{{ .Package.Version }}-{{ .Package.Epoch }}"`,
Args: cobra.MinimumNArgs(2),
RunE: func(cmd *cobra.Command, args []string) error {
return QueryCmd(cmd.Context(), args[0], args[1])
},
}
return cmd
}
func QueryCmd(ctx context.Context, configFile, pattern string) error {
config, err := config.ParseConfiguration(ctx, configFile)
if err != nil {
return err
}
tmpl, err := template.New("query").Parse(pattern)
if err != nil {
return fmt.Errorf("invalid template: %w", err)
}
err = tmpl.Execute(os.Stdout, config)
if err != nil {
return fmt.Errorf("error executing template: %w", err)
}
return nil
}