woodpecker/pipeline/backend/local/local.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.
package local
import (
"context"
"errors"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"runtime"
"slices"
"sync"
"github.com/rs/zerolog/log"
"github.com/urfave/cli/v2"
"golang.org/x/text/encoding/unicode"
"golang.org/x/text/transform"
"go.woodpecker-ci.org/woodpecker/v2/pipeline/backend/types"
)
type workflowState struct {
stepCMDs map[string]*exec.Cmd
baseDir string
homeDir string
workspaceDir string
pluginGitBinary string
}
type local struct {
tempDir string
workflows sync.Map
output io.ReadCloser
pluginGitBinary string
os, arch string
}
// New returns a new local Backend.
func New() types.Backend {
return &local{
os: runtime.GOOS,
arch: runtime.GOARCH,
}
}
func (e *local) Name() string {
return "local"
}
func (e *local) IsAvailable(context.Context) bool {
return true
}
func (e *local) Flags() []cli.Flag {
return Flags
}
func (e *local) Load(ctx context.Context) (*types.BackendInfo, error) {
c, ok := ctx.Value(types.CliContext).(*cli.Context)
if ok {
e.tempDir = c.String("backend-local-temp-dir")
}
e.loadClone()
return &types.BackendInfo{
Platform: e.os + "/" + e.arch,
}, nil
}
// SetupWorkflow the pipeline environment.
func (e *local) SetupWorkflow(_ context.Context, _ *types.Config, taskUUID string) error {
log.Trace().Str("taskUUID", taskUUID).Msg("create workflow environment")
baseDir, err := os.MkdirTemp(e.tempDir, "woodpecker-local-*")
if err != nil {
return err
}
state := &workflowState{
stepCMDs: make(map[string]*exec.Cmd),
baseDir: baseDir,
workspaceDir: filepath.Join(baseDir, "workspace"),
homeDir: filepath.Join(baseDir, "home"),
}
if err := os.Mkdir(state.homeDir, 0o700); err != nil {
return err
}
if err := os.Mkdir(state.workspaceDir, 0o700); err != nil {
return err
}
e.saveState(taskUUID, state)
return nil
}
// StartStep the pipeline step.
func (e *local) StartStep(ctx context.Context, step *types.Step, taskUUID string) error {
log.Trace().Str("taskUUID", taskUUID).Msgf("start step %s", step.Name)
state, err := e.getState(taskUUID)
if err != nil {
return err
}
// Get environment variables
env := os.Environ()
for a, b := range step.Environment {
// append allowed env vars to command env
if !slices.Contains(notAllowedEnvVarOverwrites, a) {
env = append(env, a+"="+b)
}
}
// Set HOME and CI_WORKSPACE
env = append(env, "HOME="+state.homeDir)
env = append(env, "USERPROFILE="+state.homeDir)
env = append(env, "CI_WORKSPACE="+state.workspaceDir)
switch step.Type {
case types.StepTypeClone:
return e.execClone(ctx, step, state, env)
case types.StepTypeCommands:
return e.execCommands(ctx, step, state, env)
case types.StepTypePlugin:
return e.execPlugin(ctx, step, state, env)
default:
return ErrUnsupportedStepType
}
}
// execCommands use step.Image as shell and run the commands in it.
func (e *local) execCommands(ctx context.Context, step *types.Step, state *workflowState, env []string) error {
// Prepare commands
// TODO: support `entrypoint` from pipeline config
args, err := e.genCmdByShell(step.Image, step.Commands)
if err != nil {
return fmt.Errorf("could not convert commands into args: %w", err)
}
// Use "image name" as run command (indicate shell)
cmd := exec.CommandContext(ctx, step.Image, args...)
cmd.Env = env
cmd.Dir = state.workspaceDir
// Get output and redirect Stderr to Stdout
e.output, _ = cmd.StdoutPipe()
cmd.Stderr = cmd.Stdout
if e.os == "windows" {
// we get non utf8 output from windows so just sanitize it
// TODO: remove hack
e.output = io.NopCloser(transform.NewReader(e.output, unicode.UTF8.NewDecoder().Transformer))
}
state.stepCMDs[step.UUID] = cmd
return cmd.Start()
}
// execPlugin use step.Image as exec binary.
func (e *local) execPlugin(ctx context.Context, step *types.Step, state *workflowState, env []string) error {
binary, err := exec.LookPath(step.Image)
if err != nil {
return fmt.Errorf("lookup plugin binary: %w", err)
}
cmd := exec.CommandContext(ctx, binary)
cmd.Env = env
cmd.Dir = state.workspaceDir
// Get output and redirect Stderr to Stdout
e.output, _ = cmd.StdoutPipe()
cmd.Stderr = cmd.Stdout
state.stepCMDs[step.UUID] = cmd
return cmd.Start()
}
// WaitStep for the pipeline step to complete and returns
// the completion results.
func (e *local) WaitStep(_ context.Context, step *types.Step, taskUUID string) (*types.State, error) {
log.Trace().Str("taskUUID", taskUUID).Msgf("wait for step %s", step.Name)
state, err := e.getState(taskUUID)
if err != nil {
return nil, err
}
cmd, ok := state.stepCMDs[step.UUID]
if !ok {
return nil, fmt.Errorf("step cmd for %s not found", step.UUID)
}
err = cmd.Wait()
ExitCode := 0
var execExitError *exec.ExitError
if errors.As(err, &execExitError) {
ExitCode = execExitError.ExitCode()
// Non-zero exit code is a pipeline failure, but not an agent error.
err = nil
}
return &types.State{
Exited: true,
ExitCode: ExitCode,
}, err
}
// TailStep the pipeline step logs.
func (e *local) TailStep(_ context.Context, step *types.Step, taskUUID string) (io.ReadCloser, error) {
log.Trace().Str("taskUUID", taskUUID).Msgf("tail logs of step %s", step.Name)
return e.output, nil
}
func (e *local) DestroyStep(_ context.Context, _ *types.Step, _ string) error {
// WaitStep already waits for the command to finish, so there is nothing to do here.
return nil
}
// DestroyWorkflow the pipeline environment.
func (e *local) DestroyWorkflow(_ context.Context, _ *types.Config, taskUUID string) error {
log.Trace().Str("taskUUID", taskUUID).Msg("delete workflow environment")
state, err := e.getState(taskUUID)
if err != nil {
return err
}
err = os.RemoveAll(state.baseDir)
if err != nil {
return err
}
e.deleteState(taskUUID)
return err
}
func (e *local) getState(taskUUID string) (*workflowState, error) {
state, ok := e.workflows.Load(taskUUID)
if !ok {
return nil, ErrWorkflowStateNotFound
}
s, ok := state.(*workflowState)
if !ok {
return nil, fmt.Errorf("could not parse state: %v", state)
}
return s, nil
}
func (e *local) saveState(taskUUID string, state *workflowState) {
e.workflows.Store(taskUUID, state)
}
func (e *local) deleteState(taskUUID string) {
e.workflows.Delete(taskUUID)
}