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uncity.go
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uncity.go
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/*
Copyright 2020 The Compose Specification 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 override
import (
"fmt"
"strconv"
"strings"
"github.com/compose-spec/compose-go/v2/format"
"github.com/compose-spec/compose-go/v2/tree"
)
type indexer func(any, tree.Path) (string, error)
// mergeSpecials defines the custom rules applied by compose when merging yaml trees
var unique = map[tree.Path]indexer{}
func init() {
unique["networks.*.labels"] = keyValueIndexer
unique["networks.*.ipam.options"] = keyValueIndexer
unique["services.*.annotations"] = keyValueIndexer
unique["services.*.build.args"] = keyValueIndexer
unique["services.*.build.additional_contexts"] = keyValueIndexer
unique["services.*.build.extra_hosts"] = keyValueIndexer
unique["services.*.build.platform"] = keyValueIndexer
unique["services.*.build.tags"] = keyValueIndexer
unique["services.*.build.labels"] = keyValueIndexer
unique["services.*.cap_add"] = keyValueIndexer
unique["services.*.cap_drop"] = keyValueIndexer
unique["services.*.configs"] = mountIndexer("")
unique["services.*.deploy.labels"] = keyValueIndexer
unique["services.*.dns"] = keyValueIndexer
unique["services.*.dns_opt"] = keyValueIndexer
unique["services.*.dns_search"] = keyValueIndexer
unique["services.*.environment"] = keyValueIndexer
unique["services.*.env_file"] = envFileIndexer
unique["services.*.expose"] = exposeIndexer
unique["services.*.extra_hosts"] = keyValueIndexer
unique["services.*.labels"] = keyValueIndexer
unique["services.*.links"] = keyValueIndexer
unique["services.*.networks.*.aliases"] = keyValueIndexer
unique["services.*.networks.*.link_local_ips"] = keyValueIndexer
unique["services.*.ports"] = portIndexer
unique["services.*.profiles"] = keyValueIndexer
unique["services.*.secrets"] = mountIndexer("/run/secrets")
unique["services.*.sysctls"] = keyValueIndexer
unique["services.*.tmpfs"] = keyValueIndexer
unique["services.*.volumes"] = volumeIndexer
}
// EnforceUnicity removes redefinition of elements declared in a sequence
func EnforceUnicity(value map[string]any) (map[string]any, error) {
uniq, err := enforceUnicity(value, tree.NewPath())
if err != nil {
return nil, err
}
return uniq.(map[string]any), nil
}
func enforceUnicity(value any, p tree.Path) (any, error) {
switch v := value.(type) {
case map[string]any:
for k, e := range v {
u, err := enforceUnicity(e, p.Next(k))
if err != nil {
return nil, err
}
v[k] = u
}
return v, nil
case []any:
for pattern, indexer := range unique {
if p.Matches(pattern) {
seq := []any{}
keys := map[string]int{}
for i, entry := range v {
key, err := indexer(entry, p.Next(fmt.Sprintf("[%d]", i)))
if err != nil {
return nil, err
}
if j, ok := keys[key]; ok {
seq[j] = entry
} else {
seq = append(seq, entry)
keys[key] = len(seq) - 1
}
}
return seq, nil
}
}
}
return value, nil
}
func keyValueIndexer(y any, p tree.Path) (string, error) {
switch value := y.(type) {
case string:
key, _, found := strings.Cut(value, "=")
if !found {
return value, nil
}
return key, nil
default:
return "", fmt.Errorf("%s: unexpected type %T", p, y)
}
}
func volumeIndexer(y any, p tree.Path) (string, error) {
switch value := y.(type) {
case map[string]any:
target, ok := value["target"].(string)
if !ok {
return "", fmt.Errorf("service volume %s is missing a mount target", p)
}
return target, nil
case string:
volume, err := format.ParseVolume(value)
if err != nil {
return "", err
}
return volume.Target, nil
}
return "", nil
}
func exposeIndexer(a any, path tree.Path) (string, error) {
switch v := a.(type) {
case string:
return v, nil
case int:
return strconv.Itoa(v), nil
default:
return "", fmt.Errorf("%s: unsupported expose value %s", path, a)
}
}
func mountIndexer(defaultPath string) indexer {
return func(a any, path tree.Path) (string, error) {
switch v := a.(type) {
case string:
return fmt.Sprintf("%s/%s", defaultPath, v), nil
case map[string]any:
t, ok := v["target"]
if ok {
return t.(string), nil
}
return fmt.Sprintf("%s/%s", defaultPath, v["source"]), nil
default:
return "", fmt.Errorf("%s: unsupported expose value %s", path, a)
}
}
}
func portIndexer(y any, p tree.Path) (string, error) {
switch value := y.(type) {
case int:
return strconv.Itoa(value), nil
case map[string]any:
target, ok := value["target"]
if !ok {
return "", fmt.Errorf("service ports %s is missing a target port", p)
}
published, ok := value["published"]
if !ok {
// try to parse it as an int
if pub, ok := value["published"]; ok {
published = fmt.Sprintf("%d", pub)
}
}
host, ok := value["host_ip"]
if !ok {
host = "0.0.0.0"
}
protocol, ok := value["protocol"]
if !ok {
protocol = "tcp"
}
return fmt.Sprintf("%s:%s:%d/%s", host, published, target, protocol), nil
case string:
return value, nil
}
return "", nil
}
func envFileIndexer(y any, _ tree.Path) (string, error) {
switch value := y.(type) {
case string:
return value, nil
case map[string]any:
return value["path"].(string), nil
}
return "", nil
}