github.com/lazyboychen7/engine@v17.12.1-ce-rc2+incompatible/daemon/exec/exec.go (about)

     1  package exec
     2  
     3  import (
     4  	"runtime"
     5  	"sync"
     6  
     7  	"github.com/containerd/containerd/cio"
     8  	"github.com/docker/docker/container/stream"
     9  	"github.com/docker/docker/libcontainerd"
    10  	"github.com/docker/docker/pkg/stringid"
    11  	"github.com/sirupsen/logrus"
    12  )
    13  
    14  // Config holds the configurations for execs. The Daemon keeps
    15  // track of both running and finished execs so that they can be
    16  // examined both during and after completion.
    17  type Config struct {
    18  	sync.Mutex
    19  	StreamConfig *stream.Config
    20  	ID           string
    21  	Running      bool
    22  	ExitCode     *int
    23  	OpenStdin    bool
    24  	OpenStderr   bool
    25  	OpenStdout   bool
    26  	CanRemove    bool
    27  	ContainerID  string
    28  	DetachKeys   []byte
    29  	Entrypoint   string
    30  	Args         []string
    31  	Tty          bool
    32  	Privileged   bool
    33  	User         string
    34  	WorkingDir   string
    35  	Env          []string
    36  	Pid          int
    37  }
    38  
    39  // NewConfig initializes the a new exec configuration
    40  func NewConfig() *Config {
    41  	return &Config{
    42  		ID:           stringid.GenerateNonCryptoID(),
    43  		StreamConfig: stream.NewConfig(),
    44  	}
    45  }
    46  
    47  type rio struct {
    48  	cio.IO
    49  
    50  	sc *stream.Config
    51  }
    52  
    53  func (i *rio) Close() error {
    54  	i.IO.Close()
    55  
    56  	return i.sc.CloseStreams()
    57  }
    58  
    59  func (i *rio) Wait() {
    60  	i.sc.Wait()
    61  
    62  	i.IO.Wait()
    63  }
    64  
    65  // InitializeStdio is called by libcontainerd to connect the stdio.
    66  func (c *Config) InitializeStdio(iop *libcontainerd.IOPipe) (cio.IO, error) {
    67  	c.StreamConfig.CopyToPipe(iop)
    68  
    69  	if c.StreamConfig.Stdin() == nil && !c.Tty && runtime.GOOS == "windows" {
    70  		if iop.Stdin != nil {
    71  			if err := iop.Stdin.Close(); err != nil {
    72  				logrus.Errorf("error closing exec stdin: %+v", err)
    73  			}
    74  		}
    75  	}
    76  
    77  	return &rio{IO: iop, sc: c.StreamConfig}, nil
    78  }
    79  
    80  // CloseStreams closes the stdio streams for the exec
    81  func (c *Config) CloseStreams() error {
    82  	return c.StreamConfig.CloseStreams()
    83  }
    84  
    85  // SetExitCode sets the exec config's exit code
    86  func (c *Config) SetExitCode(code int) {
    87  	c.ExitCode = &code
    88  }
    89  
    90  // Store keeps track of the exec configurations.
    91  type Store struct {
    92  	byID map[string]*Config
    93  	sync.RWMutex
    94  }
    95  
    96  // NewStore initializes a new exec store.
    97  func NewStore() *Store {
    98  	return &Store{
    99  		byID: make(map[string]*Config),
   100  	}
   101  }
   102  
   103  // Commands returns the exec configurations in the store.
   104  func (e *Store) Commands() map[string]*Config {
   105  	e.RLock()
   106  	byID := make(map[string]*Config, len(e.byID))
   107  	for id, config := range e.byID {
   108  		byID[id] = config
   109  	}
   110  	e.RUnlock()
   111  	return byID
   112  }
   113  
   114  // Add adds a new exec configuration to the store.
   115  func (e *Store) Add(id string, Config *Config) {
   116  	e.Lock()
   117  	e.byID[id] = Config
   118  	e.Unlock()
   119  }
   120  
   121  // Get returns an exec configuration by its id.
   122  func (e *Store) Get(id string) *Config {
   123  	e.RLock()
   124  	res := e.byID[id]
   125  	e.RUnlock()
   126  	return res
   127  }
   128  
   129  // Delete removes an exec configuration from the store.
   130  func (e *Store) Delete(id string, pid int) {
   131  	e.Lock()
   132  	delete(e.byID, id)
   133  	e.Unlock()
   134  }
   135  
   136  // List returns the list of exec ids in the store.
   137  func (e *Store) List() []string {
   138  	var IDs []string
   139  	e.RLock()
   140  	for id := range e.byID {
   141  		IDs = append(IDs, id)
   142  	}
   143  	e.RUnlock()
   144  	return IDs
   145  }