github.com/containerd/nerdctl@v1.7.7/pkg/composer/config.go (about)

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  /*
    18     Portions from https://github.com/docker/compose/blob/v2.2.2/pkg/compose/hash.go
    19     Copyright (C) Docker Compose authors.
    20     Licensed under the Apache License, Version 2.0
    21     NOTICE: https://github.com/docker/compose/blob/v2.2.2/NOTICE
    22  */
    23  
    24  package composer
    25  
    26  import (
    27  	"context"
    28  	"encoding/json"
    29  	"fmt"
    30  	"io"
    31  	"strings"
    32  
    33  	"github.com/compose-spec/compose-go/types"
    34  	"github.com/opencontainers/go-digest"
    35  	"gopkg.in/yaml.v3"
    36  )
    37  
    38  type ConfigOptions struct {
    39  	Services bool
    40  	Volumes  bool
    41  	Hash     string
    42  }
    43  
    44  func (c *Composer) Config(ctx context.Context, w io.Writer, co ConfigOptions) error {
    45  	if co.Services {
    46  		for _, service := range c.project.Services {
    47  			fmt.Fprintln(w, service.Name)
    48  		}
    49  		return nil
    50  	}
    51  	if co.Volumes {
    52  		for volume := range c.project.Volumes {
    53  			fmt.Fprintln(w, volume)
    54  		}
    55  		return nil
    56  	}
    57  	if co.Hash != "" {
    58  		var services []string
    59  		if co.Hash != "*" {
    60  			services = strings.Split(co.Hash, ",")
    61  		}
    62  		return c.project.WithServices(services, func(svc types.ServiceConfig) error {
    63  			hash, err := ServiceHash(svc)
    64  			if err != nil {
    65  				return err
    66  			}
    67  			fmt.Fprintf(w, "%s %s\n", svc.Name, hash)
    68  			return nil
    69  		})
    70  	}
    71  	projectYAML, err := yaml.Marshal(c.project)
    72  	if err != nil {
    73  		return err
    74  	}
    75  	fmt.Fprintf(w, "%s", projectYAML)
    76  	return nil
    77  }
    78  
    79  // ServiceHash is from https://github.com/docker/compose/blob/v2.2.2/pkg/compose/hash.go#L28-L38
    80  func ServiceHash(o types.ServiceConfig) (string, error) {
    81  	// remove the Build config when generating the service hash
    82  	o.Build = nil
    83  	o.PullPolicy = ""
    84  	o.Scale = 1
    85  	bytes, err := json.Marshal(o)
    86  	if err != nil {
    87  		return "", err
    88  	}
    89  	return digest.SHA256.FromBytes(bytes).Encoded(), nil
    90  }