woodpecker/pipeline/backend/docker/convert.go

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// Copyright 2022 Woodpecker 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.
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package docker
import (
"encoding/base64"
"encoding/json"
"maps"
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"regexp"
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"strings"
"github.com/docker/docker/api/types/container"
"go.woodpecker-ci.org/woodpecker/v2/pipeline/backend/common"
"go.woodpecker-ci.org/woodpecker/v2/pipeline/backend/types"
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)
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// Valid container volumes must have at least two components, source and destination.
const minVolumeComponents = 2
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// returns a container configuration.
func (e *docker) toConfig(step *types.Step) *container.Config {
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config := &container.Config{
Image: step.Image,
Labels: map[string]string{
"wp_uuid": step.UUID,
"wp_step": step.Name,
},
WorkingDir: step.WorkingDir,
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AttachStdout: true,
AttachStderr: true,
Volumes: toVol(step.Volumes),
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}
configEnv := make(map[string]string)
maps.Copy(configEnv, step.Environment)
if len(step.Commands) > 0 {
env, entry := common.GenerateContainerConf(step.Commands, e.info.OSType)
for k, v := range env {
configEnv[k] = v
}
config.Entrypoint = entry
}
if len(step.Entrypoint) > 0 {
config.Entrypoint = step.Entrypoint
}
if len(configEnv) != 0 {
config.Env = toEnv(configEnv)
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}
return config
}
func toContainerName(step *types.Step) string {
return "wp_" + step.UUID
}
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// returns a container host configuration.
func toHostConfig(step *types.Step) *container.HostConfig {
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config := &container.HostConfig{
Resources: container.Resources{
CPUQuota: step.CPUQuota,
CPUShares: step.CPUShares,
CpusetCpus: step.CPUSet,
Memory: step.MemLimit,
MemorySwap: step.MemSwapLimit,
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},
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LogConfig: container.LogConfig{
Type: "json-file",
},
Privileged: step.Privileged,
ShmSize: step.ShmSize,
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}
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if len(step.NetworkMode) != 0 {
config.NetworkMode = container.NetworkMode(step.NetworkMode)
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}
if len(step.DNS) != 0 {
config.DNS = step.DNS
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}
if len(step.DNSSearch) != 0 {
config.DNSSearch = step.DNSSearch
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}
extraHosts := []string{}
for _, hostAlias := range step.ExtraHosts {
extraHosts = append(extraHosts, hostAlias.Name+":"+hostAlias.IP)
}
if len(step.ExtraHosts) != 0 {
config.ExtraHosts = extraHosts
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}
if len(step.Devices) != 0 {
config.Devices = toDev(step.Devices)
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}
if len(step.Volumes) != 0 {
config.Binds = step.Volumes
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}
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config.Tmpfs = map[string]string{}
for _, path := range step.Tmpfs {
if !strings.Contains(path, ":") {
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config.Tmpfs[path] = ""
continue
}
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parts, err := splitVolumeParts(path)
if err != nil {
continue
}
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config.Tmpfs[parts[0]] = parts[1]
}
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return config
}
// helper function that converts a slice of volume paths to a set of
// unique volume names.
func toVol(paths []string) map[string]struct{} {
if len(paths) == 0 {
return nil
}
set := make(map[string]struct{})
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for _, path := range paths {
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parts, err := splitVolumeParts(path)
if err != nil {
continue
}
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if len(parts) < minVolumeComponents {
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continue
}
set[parts[1]] = struct{}{}
}
return set
}
// helper function that converts a key value map of environment variables to a
// string slice in key=value format.
func toEnv(env map[string]string) []string {
var envs []string
for k, v := range env {
if k != "" {
envs = append(envs, k+"="+v)
}
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}
return envs
}
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// toDev converts a slice of volume paths to a set of device mappings for
// use in a Docker container config. It handles splitting the volume paths
// into host and container paths, and setting default permissions.
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func toDev(paths []string) []container.DeviceMapping {
var devices []container.DeviceMapping
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for _, path := range paths {
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parts, err := splitVolumeParts(path)
if err != nil {
continue
}
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if len(parts) < minVolumeComponents {
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continue
}
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if strings.HasSuffix(parts[1], ":ro") || strings.HasSuffix(parts[1], ":rw") {
parts[1] = parts[1][:len(parts[1])-1]
}
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devices = append(devices, container.DeviceMapping{
PathOnHost: parts[0],
PathInContainer: parts[1],
CgroupPermissions: "rwm",
})
}
return devices
}
// helper function that serializes the auth configuration as JSON
// base64 payload.
func encodeAuthToBase64(authConfig types.Auth) (string, error) {
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buf, err := json.Marshal(authConfig)
if err != nil {
return "", err
}
return base64.URLEncoding.EncodeToString(buf), nil
}
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// splitVolumeParts splits a volume string into its constituent parts.
//
// The parts are:
//
// 1. The path on the host machine
// 2. The path inside the container
// 3. The read/write mode
//
// It handles Windows and Linux style volume paths.
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func splitVolumeParts(volumeParts string) ([]string, error) {
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// cspell:disable-next-line
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pattern := `^((?:[\w]\:)?[^\:]*)\:((?:[\w]\:)?[^\:]*)(?:\:([rwom]*))?`
r, err := regexp.Compile(pattern)
if err != nil {
return []string{}, err
}
if r.MatchString(volumeParts) {
results := r.FindStringSubmatch(volumeParts)[1:]
var cleanResults []string
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for _, item := range results {
if item != "" {
cleanResults = append(cleanResults, item)
}
}
return cleanResults, nil
}
return strings.Split(volumeParts, ":"), nil
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}