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12 commits

Author SHA1 Message Date
Brian Goff
5ea75bb6bf Move StreamConfig out of runconfig
`StreamConfig` carries with it a dep on libcontainerd, which is used by
other projects, but libcontainerd doesn't compile on all platforms, so
move it to `github.com/docker/docker/container/stream`

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
2016-11-14 15:15:09 -05:00
Vincent Demeester
2f7e907846
Small log formatting fixes
… and clise to close 👼

Signed-off-by: Vincent Demeester <vincent@sbr.pm>
2016-10-27 15:29:24 -07:00
Tonis Tiigi
37a3be2449 Move stdio attach from libcontainerd backend to callback
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
2016-10-24 00:20:36 -07:00
Antonio Murdaca
1808348136
record pid of exec'd process
Signed-off-by: Antonio Murdaca <runcom@redhat.com>
2016-10-20 17:06:11 +02:00
Michael Crosby
4633f15f13 Add TERM env var to exec
When the `-t` flag is passed on exec make sure to add the TERM env var
to mirror the expected configuration from run.

Fixes #9299

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
2016-09-12 09:20:27 -07:00
Tonis Tiigi
9c4570a958 Replace execdrivers with containerd implementation
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>
Signed-off-by: Anusha Ragunathan <anusha@docker.com>
2016-03-18 13:38:32 -07:00
Qiang Huang
dc56a76bc9 Fix race condition with exec and resize
When I use `docker exec -ti test ls`, I got error:
```
ERRO[0035] Handler for POST /v1.23/exec/9677ecd7aa9de96f8e9e667519ff266ad26a5be80e80021a997fff6084ed6d75/resize returned error: bad file descriptor
```

It's because `POST /exec/<id>/start` and
`POST /exec/<id>/resize` are asynchronous, it is
possible that exec process finishes and ternimal
is closed before resize. Then `console.Fd()` will
get a large invalid number and we got the above
error.

Fix it by adding synchronization between exec and
resize.

Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
2016-03-11 09:59:50 +08:00
David Calavera
a793564b25 Remove static errors from errors package.
Moving all strings to the errors package wasn't a good idea after all.

Our custom implementation of Go errors predates everything that's nice
and good about working with errors in Go. Take as an example what we
have to do to get an error message:

```go
func GetErrorMessage(err error) string {
	switch err.(type) {
	case errcode.Error:
		e, _ := err.(errcode.Error)
		return e.Message

	case errcode.ErrorCode:
		ec, _ := err.(errcode.ErrorCode)
		return ec.Message()

	default:
		return err.Error()
	}
}
```

This goes against every good practice for Go development. The language already provides a simple, intuitive and standard way to get error messages, that is calling the `Error()` method from an error. Reinventing the error interface is a mistake.

Our custom implementation also makes very hard to reason about errors, another nice thing about Go. I found several (>10) error declarations that we don't use anywhere. This is a clear sign about how little we know about the errors we return. I also found several error usages where the number of arguments was different than the parameters declared in the error, another clear example of how difficult is to reason about errors.

Moreover, our custom implementation didn't really make easier for people to return custom HTTP status code depending on the errors. Again, it's hard to reason about when to set custom codes and how. Take an example what we have to do to extract the message and status code from an error before returning a response from the API:

```go
	switch err.(type) {
	case errcode.ErrorCode:
		daError, _ := err.(errcode.ErrorCode)
		statusCode = daError.Descriptor().HTTPStatusCode
		errMsg = daError.Message()

	case errcode.Error:
		// For reference, if you're looking for a particular error
		// then you can do something like :
		//   import ( derr "github.com/docker/docker/errors" )
		//   if daError.ErrorCode() == derr.ErrorCodeNoSuchContainer { ... }

		daError, _ := err.(errcode.Error)
		statusCode = daError.ErrorCode().Descriptor().HTTPStatusCode
		errMsg = daError.Message

	default:
		// This part of will be removed once we've
		// converted everything over to use the errcode package

		// FIXME: this is brittle and should not be necessary.
		// If we need to differentiate between different possible error types,
		// we should create appropriate error types with clearly defined meaning
		errStr := strings.ToLower(err.Error())
		for keyword, status := range map[string]int{
			"not found":             http.StatusNotFound,
			"no such":               http.StatusNotFound,
			"bad parameter":         http.StatusBadRequest,
			"conflict":              http.StatusConflict,
			"impossible":            http.StatusNotAcceptable,
			"wrong login/password":  http.StatusUnauthorized,
			"hasn't been activated": http.StatusForbidden,
		} {
			if strings.Contains(errStr, keyword) {
				statusCode = status
				break
			}
		}
	}
```

You can notice two things in that code:

1. We have to explain how errors work, because our implementation goes against how easy to use Go errors are.
2. At no moment we arrived to remove that `switch` statement that was the original reason to use our custom implementation.

This change removes all our status errors from the errors package and puts them back in their specific contexts.
IT puts the messages back with their contexts. That way, we know right away when errors used and how to generate their messages.
It uses custom interfaces to reason about errors. Errors that need to response with a custom status code MUST implementent this simple interface:

```go
type errorWithStatus interface {
	HTTPErrorStatusCode() int
}
```

This interface is very straightforward to implement. It also preserves Go errors real behavior, getting the message is as simple as using the `Error()` method.

I included helper functions to generate errors that use custom status code in `errors/errors.go`.

By doing this, we remove the hard dependency we have eeverywhere to our custom errors package. Yes, you can use it as a helper to generate error, but it's still very easy to generate errors without it.

Please, read this fantastic blog post about errors in Go: http://dave.cheney.net/2014/12/24/inspecting-errors

Signed-off-by: David Calavera <david.calavera@gmail.com>
2016-02-26 15:49:09 -05:00
Pei Su
e5e62b96ce Fix race condition in execCommandGC
`daemon.execCommandGC`
The daemon object (grep execCommandGC) iterate over a map
(grep execCommands.Commands) in a goroutine.
Lock can't protect concurrency access in this case.
Exec command storage object should return a copy of commands instead.

Signed-off-by: Pei Su <sillyousu@gmail.com>
2016-01-20 12:52:05 +08:00
Brian Goff
1a60a805bf Fix panic on starting exec more than once
Issue was caused when exec is tarted, exits, then stated again.
In this case, `Close` is called twice, which closes a channel twice.

Changes execConfig.ExitCode to a pointer so we can test if the it has
been set or not.
This allows us to return early when the exec has already been run.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
2016-01-15 11:57:23 -05:00
Vincent Demeester
15aa2a663b Implement configurable detach key
Implement configurable detach keys (for `attach`, exec`, `run` and
`start`) using the client-side configuration

- Adds a `--detach-keys` flag to `attach`, `exec`, `run` and `start`
  commands.
- Adds a new configuration field (in `~/.docker/config.json`) to
  configure the default escape keys for docker client.

Signed-off-by: Vincent Demeester <vincent@sbr.pm>
2016-01-03 23:03:39 +01:00
David Calavera
9ca2e4e81c Move exec store to its own package inside the daemon.
Remove double reference between containers and exec configurations by
keeping only the container id.

Signed-off-by: David Calavera <david.calavera@gmail.com>
2015-11-20 17:40:16 -05:00