aboutsummaryrefslogtreecommitdiff
path: root/pkg/api/handlers/compat/exec.go
blob: 8f7016903b86765aa8d322b874780c03dfd4a185 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
package compat

import (
	"encoding/json"
	"fmt"
	"net/http"
	"strings"

	"github.com/containers/libpod/libpod"
	"github.com/containers/libpod/libpod/define"
	"github.com/containers/libpod/pkg/api/handlers"
	"github.com/containers/libpod/pkg/api/handlers/utils"
	"github.com/containers/libpod/pkg/specgen/generate"
	"github.com/gorilla/mux"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

// ExecCreateHandler creates an exec session for a given container.
func ExecCreateHandler(w http.ResponseWriter, r *http.Request) {
	runtime := r.Context().Value("runtime").(*libpod.Runtime)

	input := new(handlers.ExecCreateConfig)
	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
		utils.InternalServerError(w, errors.Wrapf(err, "error decoding request body as JSON"))
		return
	}

	ctrName := utils.GetName(r)
	ctr, err := runtime.LookupContainer(ctrName)
	if err != nil {
		utils.ContainerNotFound(w, ctrName, err)
		return
	}

	libpodConfig := new(libpod.ExecConfig)
	libpodConfig.Command = input.Cmd
	libpodConfig.Terminal = input.Tty
	libpodConfig.AttachStdin = input.AttachStdin
	libpodConfig.AttachStderr = input.AttachStderr
	libpodConfig.AttachStdout = input.AttachStdout
	if input.DetachKeys != "" {
		libpodConfig.DetachKeys = &input.DetachKeys
	}
	libpodConfig.Environment = make(map[string]string)
	for _, envStr := range input.Env {
		split := strings.SplitN(envStr, "=", 2)
		if len(split) != 2 {
			utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest, errors.Errorf("environment variable %q badly formed, must be key=value", envStr))
			return
		}
		libpodConfig.Environment[split[0]] = split[1]
	}
	libpodConfig.WorkDir = input.WorkingDir
	libpodConfig.Privileged = input.Privileged
	libpodConfig.User = input.User

	// Make our exit command
	storageConfig := runtime.StorageConfig()
	runtimeConfig, err := runtime.GetConfig()
	if err != nil {
		utils.InternalServerError(w, err)
		return
	}
	exitCommandArgs, err := generate.CreateExitCommandArgs(storageConfig, runtimeConfig, false, true, true)
	if err != nil {
		utils.InternalServerError(w, err)
		return
	}
	libpodConfig.ExitCommand = exitCommandArgs

	// Run the exit command after 5 minutes, to mimic Docker's exec cleanup
	// behavior.
	libpodConfig.ExitCommandDelay = 5 * 60

	sessID, err := ctr.ExecCreate(libpodConfig)
	if err != nil {
		if errors.Cause(err) == define.ErrCtrStateInvalid {
			// Check if the container is paused. If so, return a 409
			state, err := ctr.State()
			if err == nil {
				// Ignore the error != nil case. We're already
				// throwing an InternalServerError below.
				if state == define.ContainerStatePaused {
					utils.Error(w, "Container is paused", http.StatusConflict, errors.Errorf("cannot create exec session as container %s is paused", ctr.ID()))
					return
				}
			}
		}
		utils.InternalServerError(w, err)
		return
	}

	resp := new(handlers.ExecCreateResponse)
	resp.ID = sessID

	utils.WriteResponse(w, http.StatusCreated, resp)
}

// ExecInspectHandler inspects a given exec session.
func ExecInspectHandler(w http.ResponseWriter, r *http.Request) {
	runtime := r.Context().Value("runtime").(*libpod.Runtime)

	sessionID := mux.Vars(r)["id"]
	sessionCtr, err := runtime.GetExecSessionContainer(sessionID)
	if err != nil {
		utils.Error(w, fmt.Sprintf("No such exec session: %s", sessionID), http.StatusNotFound, err)
		return
	}

	logrus.Debugf("Inspecting exec session %s of container %s", sessionID, sessionCtr.ID())

	session, err := sessionCtr.ExecSession(sessionID)
	if err != nil {
		utils.InternalServerError(w, errors.Wrapf(err, "error retrieving exec session %s from container %s", sessionID, sessionCtr.ID()))
		return
	}

	inspectOut, err := session.Inspect()
	if err != nil {
		utils.InternalServerError(w, err)
		return
	}

	utils.WriteResponse(w, http.StatusOK, inspectOut)
}

// ExecStartHandler runs a given exec session.
func ExecStartHandler(w http.ResponseWriter, r *http.Request) {
	runtime := r.Context().Value("runtime").(*libpod.Runtime)

	sessionID := mux.Vars(r)["id"]

	// TODO: We should read/support Tty from here.
	bodyParams := new(handlers.ExecStartConfig)

	if err := json.NewDecoder(r.Body).Decode(&bodyParams); err != nil {
		utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest,
			errors.Wrapf(err, "failed to decode parameters for %s", r.URL.String()))
		return
	}
	// TODO: Verify TTY setting against what inspect session was made with

	sessionCtr, err := runtime.GetExecSessionContainer(sessionID)
	if err != nil {
		utils.Error(w, fmt.Sprintf("No such exec session: %s", sessionID), http.StatusNotFound, err)
		return
	}

	logrus.Debugf("Starting exec session %s of container %s", sessionID, sessionCtr.ID())

	state, err := sessionCtr.State()
	if err != nil {
		utils.InternalServerError(w, err)
		return
	}
	if state != define.ContainerStateRunning {
		utils.Error(w, http.StatusText(http.StatusConflict), http.StatusConflict, errors.Errorf("cannot exec in a container that is not running; container %s is %s", sessionCtr.ID(), state.String()))
		return
	}

	if bodyParams.Detach {
		// If we are detaching, we do NOT want to hijack.
		// Instead, we perform a detached start, and return 200 if
		// successful.
		if err := sessionCtr.ExecStart(sessionID); err != nil {
			utils.InternalServerError(w, err)
			return
		}
		// This is a 200 despite having no content
		utils.WriteResponse(w, http.StatusOK, "")
		return
	}

	// Hijack the connection
	hijacker, ok := w.(http.Hijacker)
	if !ok {
		utils.InternalServerError(w, errors.Errorf("unable to hijack connection"))
		return
	}

	connection, buffer, err := hijacker.Hijack()
	if err != nil {
		utils.InternalServerError(w, errors.Wrapf(err, "error hijacking connection"))
		return
	}

	fmt.Fprintf(connection, AttachHeader)

	logrus.Debugf("Hijack for attach of container %s exec session %s successful", sessionCtr.ID(), sessionID)

	if err := sessionCtr.ExecHTTPStartAndAttach(sessionID, connection, buffer, nil, nil, nil); err != nil {
		logrus.Errorf("Error attaching to container %s exec session %s: %v", sessionCtr.ID(), sessionID, err)
	}

	logrus.Debugf("Attach for container %s exec session %s completed successfully", sessionCtr.ID(), sessionID)
}