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
198
199
200
201
202
203
|
package app
import (
"errors"
"os"
"os/exec"
"strconv"
"time"
"git.ophivana.moe/cat/fortify/internal/state"
"git.ophivana.moe/cat/fortify/internal/verbose"
)
type (
// ProcessError encapsulates errors returned by starting *exec.Cmd
ProcessError BaseError
)
// Start starts the fortified child
func (a *app) Start() error {
a.lock.Lock()
defer a.lock.Unlock()
if err := a.seal.sys.commit(); err != nil {
return err
}
// select command builder
var commandBuilder func() (args []string)
switch a.seal.launchOption {
case LaunchMethodSudo:
commandBuilder = a.commandBuilderSudo
case LaunchMethodMachineCtl:
commandBuilder = a.commandBuilderMachineCtl
default:
panic("unreachable")
}
// configure child process
a.cmd = exec.Command(a.seal.toolPath, commandBuilder()...)
a.cmd.Env = []string{}
a.cmd.Stdin = os.Stdin
a.cmd.Stdout = os.Stdout
a.cmd.Stderr = os.Stderr
a.cmd.Dir = a.seal.RunDirPath
// start child process
verbose.Println("starting main process:", a.cmd)
if err := a.cmd.Start(); err != nil {
return (*ProcessError)(wrapError(err, "cannot start process:", err))
}
startTime := time.Now().UTC()
// create process state
sd := state.State{
PID: a.cmd.Process.Pid,
Command: a.seal.command,
Capability: a.seal.et,
Launcher: a.seal.toolPath,
Argv: a.cmd.Args,
Time: startTime,
}
// register process state
var e = new(StateStoreError)
e.Inner, e.DoErr = a.seal.store.Do(func(b state.Backend) {
e.InnerErr = b.Save(&sd)
})
return e.equiv("cannot save process state:", e)
}
// StateStoreError is returned for a failed state save
type StateStoreError struct {
// whether inner function was called
Inner bool
// error returned by state.Store Do method
DoErr error
// error returned by state.Backend Save method
InnerErr error
// any other errors needing to be tracked
Err error
}
func (e *StateStoreError) equiv(a ...any) error {
if e.Inner == true && e.DoErr == nil && e.InnerErr == nil && e.Err == nil {
return nil
} else {
return wrapError(e, a...)
}
}
func (e *StateStoreError) Error() string {
if e.Inner && e.InnerErr != nil {
return e.InnerErr.Error()
}
if e.DoErr != nil {
return e.DoErr.Error()
}
if e.Err != nil {
return e.Err.Error()
}
return "(nil)"
}
func (e *StateStoreError) Unwrap() (errs []error) {
errs = make([]error, 0, 3)
if e.DoErr != nil {
errs = append(errs, e.DoErr)
}
if e.InnerErr != nil {
errs = append(errs, e.InnerErr)
}
if e.Err != nil {
errs = append(errs, e.Err)
}
return
}
type RevertCompoundError interface {
Error() string
Unwrap() []error
}
func (a *app) Wait() (int, error) {
a.lock.Lock()
defer a.lock.Unlock()
var r int
// wait for process and resolve exit code
if err := a.cmd.Wait(); err != nil {
var exitError *exec.ExitError
if !errors.As(err, &exitError) {
// should be unreachable
a.wait = err
}
// store non-zero return code
r = exitError.ExitCode()
} else {
r = a.cmd.ProcessState.ExitCode()
}
verbose.Println("process", strconv.Itoa(a.cmd.Process.Pid), "exited with exit code", r)
// update store and revert app setup transaction
e := new(StateStoreError)
e.Inner, e.DoErr = a.seal.store.Do(func(b state.Backend) {
e.InnerErr = func() error {
// destroy defunct state entry
if err := b.Destroy(a.cmd.Process.Pid); err != nil {
return err
}
// enablements of remaining launchers
rt, tags := new(state.Enablements), new(state.Enablements)
tags.Set(state.EnableLength + 1)
if states, err := b.Load(); err != nil {
return err
} else {
if l := len(states); l == 0 {
// cleanup globals as the final launcher
verbose.Println("no other launchers active, will clean up globals")
tags.Set(state.EnableLength)
} else {
verbose.Printf("found %d active launchers, cleaning up without globals\n", l)
}
// accumulate capabilities of other launchers
for _, s := range states {
*rt |= s.Capability
}
}
// invert accumulated enablements for cleanup
for i := state.Enablement(0); i < state.EnableLength; i++ {
if !rt.Has(i) {
tags.Set(i)
}
}
if verbose.Get() {
ct := make([]state.Enablement, 0, state.EnableLength)
for i := state.Enablement(0); i < state.EnableLength; i++ {
if tags.Has(i) {
ct = append(ct, i)
}
}
verbose.Println("will revert operations tagged", ct, "as no remaining launchers hold these enablements")
}
if err := a.seal.sys.revert(tags); err != nil {
return err.(RevertCompoundError)
}
return nil
}()
})
e.Err = a.seal.store.Close()
return r, e.equiv("error returned during cleanup:", e)
}
|
