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
|
// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2017 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package cmdstate
import (
"errors"
"strings"
"time"
"gopkg.in/tomb.v2"
"github.com/snapcore/snapd/osutil"
"github.com/snapcore/snapd/overlord/state"
)
// CommandManager helps running arbitrary commands as tasks.
type CommandManager struct{}
// Manager returns a new CommandManager.
func Manager(st *state.State, runner *state.TaskRunner) *CommandManager {
runner.AddHandler("exec-command", doExec, nil)
return &CommandManager{}
}
// Ensure is part of the overlord.StateManager interface.
func (m *CommandManager) Ensure() error {
return nil
}
var defaultExecTimeout = 5 * time.Second
func doExec(t *state.Task, tomb *tomb.Tomb) error {
st := t.State()
st.Lock()
defer st.Unlock()
var ignore bool
if err := t.Get("ignore", &ignore); err != nil && !errors.Is(err, state.ErrNoState) {
return err
}
if ignore {
t.Logf("task ignored")
return nil
}
var argv []string
var tout time.Duration
if err := t.Get("argv", &argv); err != nil {
return err
}
err := t.Get("timeout", &tout)
// timeout is optional and might not be set
if err != nil && !errors.Is(err, state.ErrNoState) {
return err
}
if errors.Is(err, state.ErrNoState) {
tout = defaultExecTimeout
}
// the command needs to be run with unlocked state, but after that
// we need to restore the lock (for Errorf, and for deferred unlocking
// above).
st.Unlock()
buf, err := osutil.RunAndWait(argv, nil, tout, tomb)
st.Lock()
if err != nil {
t.Errorf("# %s\n%s", strings.Join(argv, " "), buf)
return err
}
return nil
}
|
