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
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
//
// Copyright 2015 Manuel A. Fernandez Montecelo
//
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// 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; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
#include "dpkg_selections.h"
#include "aptitude.h"
#include <apt-pkg/configuration.h>
#include <apt-pkg/error.h>
#include <cstdlib>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
namespace aptitude {
namespace apt {
namespace dpkg {
DpkgSelections::DpkgSelections()
{
}
DpkgSelections::~DpkgSelections()
{
}
void DpkgSelections::add(const std::string& package_name, const std::string& package_arch, pkgCache::State::PkgSelectedState state)
{
std::string state_str = to_string(state);
if (! state_str.empty())
{
selections += package_name + ":" + package_arch;
selections += " ";
selections += state_str;
selections += "\n";
}
}
void DpkgSelections::clear()
{
selections.clear();
}
bool DpkgSelections::save_selections()
{
if (selections.empty())
{
return true;
}
else
{
return save_to_dpkg(selections);
}
}
std::string DpkgSelections::to_string(pkgCache::State::PkgSelectedState state)
{
std::string dpkg_dselect_action;
switch (state)
{
case pkgCache::State::Unknown: dpkg_dselect_action = "unknown"; break;
case pkgCache::State::Purge: dpkg_dselect_action = "purge"; break;
case pkgCache::State::DeInstall: dpkg_dselect_action = "deinstall"; break;
case pkgCache::State::Install: dpkg_dselect_action = "install"; break;
case pkgCache::State::Hold: dpkg_dselect_action = "hold"; break;
default: dpkg_dselect_action = ""; break;
}
return dpkg_dselect_action;
}
bool DpkgSelections::save_to_dpkg(const std::string& selections)
{
// create the pipe
int dpkg_pipe[2];
if (pipe(dpkg_pipe))
{
_error->Error(_("Failed to create pipe for dpkg selections."));
return false;
}
// create the child process
pid_t pid = fork();
if (pid < (pid_t) 0)
{
_error->Error(_("Failed to fork process for dpkg selections."));
return false;
}
else if (pid == (pid_t) 0)
{
// child process, close other end first
close(dpkg_pipe[1]);
// handle signals with default values for this process
signal(SIGTERM, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGHUP, SIG_DFL);
signal(SIGILL, SIG_DFL);
signal(SIGSEGV, SIG_DFL);
signal(SIGBUS, SIG_DFL);
signal(SIGABRT, SIG_DFL);
// set input and output for this process
dup2(dpkg_pipe[0], STDIN_FILENO);
int fd_null = open("/dev/null", O_RDONLY);
dup2(fd_null, STDOUT_FILENO);
dup2(fd_null, STDERR_FILENO);
// get command and options
std::string dpkg_bin = _config->Find("Dir::Bin::dpkg", "dpkg");
std::vector<std::string> dpkg_args = _config->FindVector("dpkg::options", "");
// specific option for this action
dpkg_args.insert(dpkg_args.begin(), "--set-selections");
// command has to be the first of the args
dpkg_args.insert(dpkg_args.begin(), dpkg_bin);
// chroot?
std::string chroot_dir = _config->FindDir("dpkg::Chroot-Directory", "/");
int chroot_status = chroot(chroot_dir.c_str());
if (chroot_dir != "/" && chroot_status != 0)
{
//_error->Error(_("Couldn't chroot for dpkg selections"));
int errno_chroot = errno;
exit(errno_chroot);
}
// prepare exec*()
const char* command = dpkg_bin.c_str();
size_t args_with_NULL_size = dpkg_args.size() + 1;
const char* args[args_with_NULL_size];
for (size_t i = 0; i < dpkg_args.size(); ++i)
{
args[i] = dpkg_args[i].c_str();
}
args[args_with_NULL_size - 1] = NULL;
// do exec*()
execvp(command, const_cast<char**>(args));
// returns from exec*() only of error has occurred, sets errno instead of
// exit status (exit status always -1 on error)
int exec_errno = errno;
//_error->Error(_("Couldn't execute dpkg for selections"));
exit(exec_errno);
}
else
{
// parent process, close other end first
close(dpkg_pipe[0]);
// write selections to the pipe, then close
FILE* out_stream = fdopen(dpkg_pipe[1], "w");
fprintf(out_stream, "%s\n", selections.c_str());
fclose(out_stream);
close(dpkg_pipe[1]);
// wait for child to complete
int child_exit_status = -1;
int waitpid_exit_status = waitpid(pid, &child_exit_status, 0);
if (waitpid_exit_status != pid)
{
// waitpid error
_error->Error(_("Failed to execute process to save dpkg selections, waitpid error: %d: '%s'"),
errno, strerror(errno));
return false;
}
else if (WIFEXITED(child_exit_status) && WEXITSTATUS(child_exit_status) == 0)
{
// execution success!
return true;
}
else
{
// execution, problem
if (WIFEXITED(child_exit_status))
{
_error->Error(_("Failed to execute process to save dpkg selections, dpkg or trying to execute it exited with status/errno: %d"),
WEXITSTATUS(child_exit_status));
}
else if (WIFSIGNALED(child_exit_status))
{
_error->Error(_("Failed to execute process to save dpkg selections, dpkg killed by signal: %d"),
WTERMSIG(child_exit_status));
}
else
{
_error->Error(_("Failed to execute process to save dpkg selections, dpkg exited with unknown problem"));
}
return false;
}
}
}
}
}
}
|
