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processor.go
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processor.go
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package exec
import (
"bytes"
"io"
"github.com/docker/docker/api/types"
"github.com/docker/docker/pkg/stdcopy"
)
// ProcessOptions defines options applicable to the reader processor
type ProcessOptions struct {
ExecConfig types.ExecConfig
Reader io.Reader
}
// NewProcessOptions returns a new ProcessOptions instance
// with the given command and default options:
// - detach: false
// - attach stdout: true
// - attach stderr: true
func NewProcessOptions(cmd []string) *ProcessOptions {
return &ProcessOptions{
ExecConfig: types.ExecConfig{
Cmd: cmd,
Detach: false,
AttachStdout: true,
AttachStderr: true,
},
}
}
// ProcessOption defines a common interface to modify the reader processor
// These options can be passed to the Exec function in a variadic way to customize the returned Reader instance
type ProcessOption interface {
Apply(opts *ProcessOptions)
}
type ProcessOptionFunc func(opts *ProcessOptions)
func (fn ProcessOptionFunc) Apply(opts *ProcessOptions) {
fn(opts)
}
func WithUser(user string) ProcessOption {
return ProcessOptionFunc(func(opts *ProcessOptions) {
opts.ExecConfig.User = user
})
}
func WithWorkingDir(workingDir string) ProcessOption {
return ProcessOptionFunc(func(opts *ProcessOptions) {
opts.ExecConfig.WorkingDir = workingDir
})
}
func WithEnv(env []string) ProcessOption {
return ProcessOptionFunc(func(opts *ProcessOptions) {
opts.ExecConfig.Env = env
})
}
// Multiplexed returns a [ProcessOption] that configures the command execution
// to combine stdout and stderr into a single stream without Docker's multiplexing headers.
func Multiplexed() ProcessOption {
return ProcessOptionFunc(func(opts *ProcessOptions) {
// returning fast to bypass those options with a nil reader,
// which could be the case when other options are used
// to configure the exec creation.
if opts.Reader == nil {
return
}
done := make(chan struct{})
var outBuff bytes.Buffer
var errBuff bytes.Buffer
go func() {
if _, err := stdcopy.StdCopy(&outBuff, &errBuff, opts.Reader); err != nil {
return
}
close(done)
}()
<-done
opts.Reader = io.MultiReader(&outBuff, &errBuff)
})
}