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task.go
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task.go
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package task
import (
"context"
"fmt"
"io"
"os"
"runtime"
"slices"
"sync"
"sync/atomic"
"time"
"mvdan.cc/sh/v3/interp"
"github.com/go-task/task/v3/errors"
"github.com/go-task/task/v3/internal/compiler"
"github.com/go-task/task/v3/internal/env"
"github.com/go-task/task/v3/internal/execext"
"github.com/go-task/task/v3/internal/fingerprint"
"github.com/go-task/task/v3/internal/logger"
"github.com/go-task/task/v3/internal/output"
"github.com/go-task/task/v3/internal/slicesext"
"github.com/go-task/task/v3/internal/sort"
"github.com/go-task/task/v3/internal/summary"
"github.com/go-task/task/v3/internal/templater"
"github.com/go-task/task/v3/taskfile/ast"
"github.com/sajari/fuzzy"
"golang.org/x/sync/errgroup"
)
const (
// MaximumTaskCall is the max number of times a task can be called.
// This exists to prevent infinite loops on cyclic dependencies
MaximumTaskCall = 1000
)
type TempDir struct {
Remote string
Fingerprint string
}
// Executor executes a Taskfile
type Executor struct {
Taskfile *ast.Taskfile
Dir string
Entrypoint string
TempDir TempDir
Force bool
ForceAll bool
Insecure bool
Download bool
Offline bool
Timeout time.Duration
Watch bool
Verbose bool
Silent bool
AssumeYes bool
AssumeTerm bool // Used for testing
Dry bool
Summary bool
Parallel bool
Color bool
Concurrency int
Interval time.Duration
Stdin io.Reader
Stdout io.Writer
Stderr io.Writer
Logger *logger.Logger
Compiler *compiler.Compiler
Output output.Output
OutputStyle ast.Output
TaskSorter sort.TaskSorter
UserWorkingDir string
fuzzyModel *fuzzy.Model
concurrencySemaphore chan struct{}
taskCallCount map[string]*int32
mkdirMutexMap map[string]*sync.Mutex
executionHashes map[string]context.Context
executionHashesMutex sync.Mutex
}
// Run runs Task
func (e *Executor) Run(ctx context.Context, calls ...*ast.Call) error {
// check if given tasks exist
for _, call := range calls {
task, err := e.GetTask(call)
if err != nil {
if _, ok := err.(*errors.TaskNotFoundError); ok {
if _, err := e.ListTasks(ListOptions{ListOnlyTasksWithDescriptions: true}); err != nil {
return err
}
}
return err
}
if task.Internal {
if _, ok := err.(*errors.TaskNotFoundError); ok {
if _, err := e.ListTasks(ListOptions{ListOnlyTasksWithDescriptions: true}); err != nil {
return err
}
}
return &errors.TaskInternalError{TaskName: call.Task}
}
}
if e.Summary {
for i, c := range calls {
compiledTask, err := e.FastCompiledTask(c)
if err != nil {
return nil
}
summary.PrintSpaceBetweenSummaries(e.Logger, i)
summary.PrintTask(e.Logger, compiledTask)
}
return nil
}
regularCalls, watchCalls, err := e.splitRegularAndWatchCalls(calls...)
if err != nil {
return err
}
g, ctx := errgroup.WithContext(ctx)
for _, c := range regularCalls {
c := c
if e.Parallel {
g.Go(func() error { return e.RunTask(ctx, c) })
} else {
if err := e.RunTask(ctx, c); err != nil {
return err
}
}
}
if err := g.Wait(); err != nil {
return err
}
if len(watchCalls) > 0 {
return e.watchTasks(watchCalls...)
}
return nil
}
func (e *Executor) splitRegularAndWatchCalls(calls ...*ast.Call) (regularCalls []*ast.Call, watchCalls []*ast.Call, err error) {
for _, c := range calls {
t, err := e.GetTask(c)
if err != nil {
return nil, nil, err
}
if e.Watch || t.Watch {
watchCalls = append(watchCalls, c)
} else {
regularCalls = append(regularCalls, c)
}
}
return
}
// RunTask runs a task by its name
func (e *Executor) RunTask(ctx context.Context, call *ast.Call) error {
t, err := e.FastCompiledTask(call)
if err != nil {
return err
}
if !shouldRunOnCurrentPlatform(t.Platforms) {
e.Logger.VerboseOutf(logger.Yellow, `task: %q not for current platform - ignored\n`, call.Task)
return nil
}
t, err = e.CompiledTask(call)
if err != nil {
return err
}
if !e.Watch && atomic.AddInt32(e.taskCallCount[t.Task], 1) >= MaximumTaskCall {
return &errors.TaskCalledTooManyTimesError{
TaskName: t.Task,
MaximumTaskCall: MaximumTaskCall,
}
}
release := e.acquireConcurrencyLimit()
defer release()
return e.startExecution(ctx, t, func(ctx context.Context) error {
e.Logger.VerboseErrf(logger.Magenta, "task: %q started\n", call.Task)
if err := e.runDeps(ctx, t); err != nil {
return err
}
skipFingerprinting := e.ForceAll || (!call.Indirect && e.Force)
if !skipFingerprinting {
if err := ctx.Err(); err != nil {
return err
}
if err := e.areTaskRequiredVarsSet(t, call); err != nil {
return err
}
preCondMet, err := e.areTaskPreconditionsMet(ctx, t)
if err != nil {
return err
}
// Get the fingerprinting method to use
method := e.Taskfile.Method
if t.Method != "" {
method = t.Method
}
upToDate, err := fingerprint.IsTaskUpToDate(ctx, t,
fingerprint.WithMethod(method),
fingerprint.WithTempDir(e.TempDir.Fingerprint),
fingerprint.WithDry(e.Dry),
fingerprint.WithLogger(e.Logger),
)
if err != nil {
return err
}
if upToDate && preCondMet {
if e.Verbose || (!call.Silent && !t.Silent && !e.Taskfile.Silent && !e.Silent) {
e.Logger.Errf(logger.Magenta, "task: Task %q is up to date\n", t.Name())
}
return nil
}
}
for _, p := range t.Prompt {
if p != "" && !e.Dry {
if err := e.Logger.Prompt(logger.Yellow, p, "n", "y", "yes"); errors.Is(err, logger.ErrNoTerminal) {
return &errors.TaskCancelledNoTerminalError{TaskName: call.Task}
} else if errors.Is(err, logger.ErrPromptCancelled) {
return &errors.TaskCancelledByUserError{TaskName: call.Task}
} else if err != nil {
return err
}
}
}
if err := e.mkdir(t); err != nil {
e.Logger.Errf(logger.Red, "task: cannot make directory %q: %v\n", t.Dir, err)
}
var deferredExitCode uint8
for i := range t.Cmds {
if t.Cmds[i].Defer {
defer e.runDeferred(t, call, i, &deferredExitCode)
continue
}
if err := e.runCommand(ctx, t, call, i); err != nil {
if err2 := e.statusOnError(t); err2 != nil {
e.Logger.VerboseErrf(logger.Yellow, "task: error cleaning status on error: %v\n", err2)
}
exitCode, isExitError := interp.IsExitStatus(err)
if isExitError {
if t.IgnoreError {
e.Logger.VerboseErrf(logger.Yellow, "task: task error ignored: %v\n", err)
continue
}
deferredExitCode = exitCode
}
if call.Indirect {
return err
}
return &errors.TaskRunError{TaskName: t.Task, Err: err}
}
}
e.Logger.VerboseErrf(logger.Magenta, "task: %q finished\n", call.Task)
return nil
})
}
func (e *Executor) mkdir(t *ast.Task) error {
if t.Dir == "" {
return nil
}
mutex := e.mkdirMutexMap[t.Task]
mutex.Lock()
defer mutex.Unlock()
if _, err := os.Stat(t.Dir); os.IsNotExist(err) {
if err := os.MkdirAll(t.Dir, 0o755); err != nil {
return err
}
}
return nil
}
func (e *Executor) runDeps(ctx context.Context, t *ast.Task) error {
g, ctx := errgroup.WithContext(ctx)
reacquire := e.releaseConcurrencyLimit()
defer reacquire()
for _, d := range t.Deps {
d := d
g.Go(func() error {
err := e.RunTask(ctx, &ast.Call{Task: d.Task, Vars: d.Vars, Silent: d.Silent, Indirect: true})
if err != nil {
return err
}
return nil
})
}
return g.Wait()
}
func (e *Executor) runDeferred(t *ast.Task, call *ast.Call, i int, deferredExitCode *uint8) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
origTask, err := e.GetTask(call)
if err != nil {
return
}
cmd := t.Cmds[i]
vars, _ := e.Compiler.GetVariables(origTask, call)
cache := &templater.Cache{Vars: vars}
extra := map[string]any{}
if deferredExitCode != nil && *deferredExitCode > 0 {
extra["EXIT_CODE"] = fmt.Sprintf("%d", *deferredExitCode)
}
cmd.Cmd = templater.ReplaceWithExtra(cmd.Cmd, cache, extra)
if err := e.runCommand(ctx, t, call, i); err != nil {
e.Logger.VerboseErrf(logger.Yellow, "task: ignored error in deferred cmd: %s\n", err.Error())
}
}
func (e *Executor) runCommand(ctx context.Context, t *ast.Task, call *ast.Call, i int) error {
cmd := t.Cmds[i]
switch {
case cmd.Task != "":
reacquire := e.releaseConcurrencyLimit()
defer reacquire()
err := e.RunTask(ctx, &ast.Call{Task: cmd.Task, Vars: cmd.Vars, Silent: cmd.Silent, Indirect: true})
if err != nil {
return err
}
return nil
case cmd.Cmd != "":
if !shouldRunOnCurrentPlatform(cmd.Platforms) {
e.Logger.VerboseOutf(logger.Yellow, "task: [%s] %s not for current platform - ignored\n", t.Name(), cmd.Cmd)
return nil
}
if e.Verbose || (!call.Silent && !cmd.Silent && !t.Silent && !e.Taskfile.Silent && !e.Silent) {
e.Logger.Errf(logger.Green, "task: [%s] %s\n", t.Name(), cmd.Cmd)
}
if e.Dry {
return nil
}
outputWrapper := e.Output
if t.Interactive {
outputWrapper = output.Interleaved{}
}
vars, err := e.Compiler.FastGetVariables(t, call)
outputTemplater := &templater.Cache{Vars: vars}
if err != nil {
return fmt.Errorf("task: failed to get variables: %w", err)
}
stdOut, stdErr, close := outputWrapper.WrapWriter(e.Stdout, e.Stderr, t.Prefix, outputTemplater)
err = execext.RunCommand(ctx, &execext.RunCommandOptions{
Command: cmd.Cmd,
Dir: t.Dir,
Env: env.Get(t),
PosixOpts: slicesext.UniqueJoin(e.Taskfile.Set, t.Set, cmd.Set),
BashOpts: slicesext.UniqueJoin(e.Taskfile.Shopt, t.Shopt, cmd.Shopt),
Stdin: e.Stdin,
Stdout: stdOut,
Stderr: stdErr,
})
if closeErr := close(err); closeErr != nil {
e.Logger.Errf(logger.Red, "task: unable to close writer: %v\n", closeErr)
}
if _, isExitError := interp.IsExitStatus(err); isExitError && cmd.IgnoreError {
e.Logger.VerboseErrf(logger.Yellow, "task: [%s] command error ignored: %v\n", t.Name(), err)
return nil
}
return err
default:
return nil
}
}
func (e *Executor) startExecution(ctx context.Context, t *ast.Task, execute func(ctx context.Context) error) error {
h, err := e.GetHash(t)
if err != nil {
return err
}
if h == "" {
return execute(ctx)
}
e.executionHashesMutex.Lock()
if otherExecutionCtx, ok := e.executionHashes[h]; ok {
e.executionHashesMutex.Unlock()
e.Logger.VerboseErrf(logger.Magenta, "task: skipping execution of task: %s\n", h)
// Release our execution slot to avoid blocking other tasks while we wait
reacquire := e.releaseConcurrencyLimit()
defer reacquire()
<-otherExecutionCtx.Done()
return nil
}
ctx, cancel := context.WithCancel(ctx)
defer cancel()
e.executionHashes[h] = ctx
e.executionHashesMutex.Unlock()
return execute(ctx)
}
// GetTask will return the task with the name matching the given call from the taskfile.
// If no task is found, it will search for tasks with a matching alias.
// If multiple tasks contain the same alias or no matches are found an error is returned.
func (e *Executor) GetTask(call *ast.Call) (*ast.Task, error) {
// Search for a matching task
matchingTasks := e.Taskfile.Tasks.FindMatchingTasks(call)
switch len(matchingTasks) {
case 0: // Carry on
case 1:
if call.Vars == nil {
call.Vars = &ast.Vars{}
}
call.Vars.Set("MATCH", ast.Var{Value: matchingTasks[0].Wildcards})
return matchingTasks[0].Task, nil
default:
taskNames := make([]string, len(matchingTasks))
for i, matchingTask := range matchingTasks {
taskNames[i] = matchingTask.Task.Task
}
return nil, &errors.TaskNameConflictError{
Call: call.Task,
TaskNames: taskNames,
}
}
// If didn't find one, search for a task with a matching alias
var matchingTask *ast.Task
var aliasedTasks []string
for _, task := range e.Taskfile.Tasks.Values() {
if slices.Contains(task.Aliases, call.Task) {
aliasedTasks = append(aliasedTasks, task.Task)
matchingTask = task
}
}
// If we found multiple tasks
if len(aliasedTasks) > 1 {
return nil, &errors.TaskNameConflictError{
Call: call.Task,
TaskNames: aliasedTasks,
}
}
// If we found no tasks
if len(aliasedTasks) == 0 {
didYouMean := ""
if e.fuzzyModel != nil {
didYouMean = e.fuzzyModel.SpellCheck(call.Task)
}
return nil, &errors.TaskNotFoundError{
TaskName: call.Task,
DidYouMean: didYouMean,
}
}
return matchingTask, nil
}
type FilterFunc func(task *ast.Task) bool
func (e *Executor) GetTaskList(filters ...FilterFunc) ([]*ast.Task, error) {
tasks := make([]*ast.Task, 0, e.Taskfile.Tasks.Len())
// Create an error group to wait for each task to be compiled
var g errgroup.Group
// Filter tasks based on the given filter functions
for _, task := range e.Taskfile.Tasks.Values() {
var shouldFilter bool
for _, filter := range filters {
if filter(task) {
shouldFilter = true
}
}
if !shouldFilter {
tasks = append(tasks, task)
}
}
// Compile the list of tasks
for i := range tasks {
g.Go(func() error {
compiledTask, err := e.FastCompiledTask(&ast.Call{Task: tasks[i].Task})
if err != nil {
return err
}
tasks[i] = compiledTask
return nil
})
}
// Wait for all the go routines to finish
if err := g.Wait(); err != nil {
return nil, err
}
// Sort the tasks
if e.TaskSorter == nil {
e.TaskSorter = &sort.AlphaNumericWithRootTasksFirst{}
}
e.TaskSorter.Sort(tasks)
return tasks, nil
}
// FilterOutNoDesc removes all tasks that do not contain a description.
func FilterOutNoDesc(task *ast.Task) bool {
return task.Desc == ""
}
// FilterOutInternal removes all tasks that are marked as internal.
func FilterOutInternal(task *ast.Task) bool {
return task.Internal
}
func shouldRunOnCurrentPlatform(platforms []*ast.Platform) bool {
if len(platforms) == 0 {
return true
}
for _, p := range platforms {
if (p.OS == "" || p.OS == runtime.GOOS) && (p.Arch == "" || p.Arch == runtime.GOARCH) {
return true
}
}
return false
}