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/*
Copyright 2020 Docker Compose CLI authors
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 compose
import (
"archive/tar"
"bytes"
"context"
"fmt"
"strconv"
"time"
"github.com/compose-spec/compose-go/v2/types"
"github.com/docker/docker/api/types/container"
)
type mountType string
const (
secretMount mountType = "secret"
configMount mountType = "config"
)
func (s *composeService) injectSecrets(ctx context.Context, project *types.Project, service types.ServiceConfig, id string) error {
return s.injectFileReferences(ctx, project, service, id, secretMount)
}
func (s *composeService) injectConfigs(ctx context.Context, project *types.Project, service types.ServiceConfig, id string) error {
return s.injectFileReferences(ctx, project, service, id, configMount)
}
func (s *composeService) injectFileReferences(ctx context.Context, project *types.Project, service types.ServiceConfig, id string, mountType mountType) error {
mounts, sources := s.getFilesAndMap(project, service, mountType)
for _, mount := range mounts {
content, err := s.resolveFileContent(project, sources[mount.Source], mountType)
if err != nil {
return err
}
if content == "" {
continue
}
if service.ReadOnly {
return fmt.Errorf("cannot create %s %q in read-only service %s: `file` is the sole supported option", mountType, sources[mount.Source].Name, service.Name)
}
s.setDefaultTarget(&mount, mountType)
if err := s.copyFileToContainer(ctx, id, content, mount); err != nil {
return err
}
}
return nil
}
func (s *composeService) getFilesAndMap(project *types.Project, service types.ServiceConfig, mountType mountType) ([]types.FileReferenceConfig, map[string]types.FileObjectConfig) {
var files []types.FileReferenceConfig
var fileMap map[string]types.FileObjectConfig
switch mountType {
case secretMount:
files = make([]types.FileReferenceConfig, len(service.Secrets))
for i, config := range service.Secrets {
files[i] = types.FileReferenceConfig(config)
}
fileMap = make(map[string]types.FileObjectConfig)
for k, v := range project.Secrets {
fileMap[k] = types.FileObjectConfig(v)
}
case configMount:
files = make([]types.FileReferenceConfig, len(service.Configs))
for i, config := range service.Configs {
files[i] = types.FileReferenceConfig(config)
}
fileMap = make(map[string]types.FileObjectConfig)
for k, v := range project.Configs {
fileMap[k] = types.FileObjectConfig(v)
}
}
return files, fileMap
}
func (s *composeService) resolveFileContent(project *types.Project, source types.FileObjectConfig, mountType mountType) (string, error) {
if source.Content != "" {
// inlined, or already resolved by include
return source.Content, nil
}
if source.Environment != "" {
env, ok := project.Environment[source.Environment]
if !ok {
return "", fmt.Errorf("environment variable %q required by %s %q is not set", source.Environment, mountType, source.Name)
}
return env, nil
}
return "", nil
}
func (s *composeService) setDefaultTarget(file *types.FileReferenceConfig, mountType mountType) {
if file.Target == "" {
if mountType == secretMount {
file.Target = "/run/secrets/" + file.Source
} else {
file.Target = "/" + file.Source
}
} else if mountType == secretMount && !isAbsTarget(file.Target) {
file.Target = "/run/secrets/" + file.Target
}
}
func (s *composeService) copyFileToContainer(ctx context.Context, id, content string, file types.FileReferenceConfig) error {
b, err := createTar(content, file)
if err != nil {
return err
}
return s.apiClient().CopyToContainer(ctx, id, "/", &b, container.CopyToContainerOptions{
CopyUIDGID: file.UID != "" || file.GID != "",
})
}
func createTar(env string, config types.FileReferenceConfig) (bytes.Buffer, error) {
value := []byte(env)
b := bytes.Buffer{}
tarWriter := tar.NewWriter(&b)
mode := types.FileMode(0o444)
if config.Mode != nil {
mode = *config.Mode
}
var uid, gid int
if config.UID != "" {
v, err := strconv.Atoi(config.UID)
if err != nil {
return b, err
}
uid = v
}
if config.GID != "" {
v, err := strconv.Atoi(config.GID)
if err != nil {
return b, err
}
gid = v
}
header := &tar.Header{
Name: config.Target,
Size: int64(len(value)),
Mode: int64(mode),
ModTime: time.Now(),
Uid: uid,
Gid: gid,
}
err := tarWriter.WriteHeader(header)
if err != nil {
return bytes.Buffer{}, err
}
_, err = tarWriter.Write(value)
if err != nil {
return bytes.Buffer{}, err
}
err = tarWriter.Close()
return b, err
}
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