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
227
|
/*
* tar.cc - Implementation of the tarball Horizon Image Creation backend
* image, the image processing utilities for
* Project Horizon
*
* Copyright (c) 2020 Adélie Linux and contributors. All rights reserved.
* This code is licensed under the AGPL 3.0 license, as noted in the
* LICENSE-code file in the root directory of this repository.
*
* SPDX-License-Identifier: AGPL-3.0-only
*/
#include <archive.h>
#include <archive_entry.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include "basic.hh"
#include "hscript/util.hh"
#include "util/filesystem.hh"
#include "util/output.hh"
namespace Horizon {
namespace Image {
class TarBackend : public BasicBackend {
public:
enum CompressionType {
None,
GZip,
BZip2,
XZ
};
private:
CompressionType comp;
struct archive *a;
public:
TarBackend(const std::string &ir, const std::string &out,
const std::map<std::string, std::string> &opts,
CompressionType _c = None)
: BasicBackend{ir, out, opts}, comp{_c} {
std::locale::global(std::locale("C.UTF-8"));
};
int prepare() override {
int res;
error_code ec;
a = archive_write_new();
archive_write_set_format_pax_restricted(a);
switch(comp) {
case None:
break;
case GZip:
archive_write_add_filter_gzip(a);
break;
case BZip2:
archive_write_add_filter_bzip2(a);
break;
case XZ:
archive_write_add_filter_xz(a);
res = archive_write_set_filter_option(a, "xz", "threads", "0");
if(res < ARCHIVE_OK) {
output_warning("tar backend", "could not enable xz threading",
archive_error_string(a));
}
break;
}
output_info("tar backend", "creating directory tree");
fs::create_directory(this->ir_dir, ec);
if(ec && ec.value() != EEXIST) {
output_error("tar backend", "could not create IR directory",
ec.message());
return 1;
}
fs::create_directory(this->ir_dir + "/target", ec);
if(ec && ec.value() != EEXIST) {
output_error("tar backend", "could not create target directory",
ec.message());
return 1;
}
res = archive_write_open_filename(a, this->out_path.c_str());
if(res < ARCHIVE_OK) {
if(res < ARCHIVE_WARN) {
output_error("tar backend", archive_error_string(a));
return res;
} else {
output_warning("tar backend", archive_error_string(a));
}
}
return 0;
}
int create() override {
struct archive_entry *entry = archive_entry_new();
error_code ec;
int fd, r, code = 0;
struct stat s;
void *buff;
std::string target = this->ir_dir + "/target";
output_info("tar backend", "unmounting ancillary filesystems");
run_command("umount", {"-R", (ir_dir + "/target/sys")});
umount((ir_dir + "/target/proc").c_str());
run_command("umount", {"-R", (ir_dir + "/target/dev")});
output_info("tar backend", "creating archive");
for(const auto& dent : fs::recursive_directory_iterator(target, ec)) {
fs::path relpath = dent.path().lexically_relative(target);
std::string pathstr(dent.path().native());
#define OUTPUT_FAILURE(x) \
output_error("tar backend", "failed to " x " '" + pathstr + "'",\
strerror(errno));
r = lstat(pathstr.c_str(), &s);
if(r == -1) {
OUTPUT_FAILURE("stat")
code = -1;
goto ret;
}
archive_entry_copy_stat(entry, &s);
if(fs::is_symlink(dent)) {
archive_entry_set_filetype(entry, AE_IFLNK);
fs::path resolved = fs::read_symlink(dent.path(), ec);
if(ec) {
output_error("tar backend", "failed to read symlink",
strerror(ec.value()));
code = -1;
goto ret;
}
const auto r_path = resolved.native();
archive_entry_update_symlink_utf8(entry, r_path.c_str());
}
archive_entry_update_pathname_utf8(entry, relpath.native().c_str());
if(archive_write_header(this->a, entry) != ARCHIVE_OK) {
output_error("tar backend", archive_error_string(a));
code = -1;
goto ret;
}
if(fs::is_regular_file(dent) && !fs::is_symlink(dent) &&
s.st_size > 0) {
fd = open(pathstr.c_str(), O_RDONLY);
if(fd == -1) {
OUTPUT_FAILURE("open")
code = -1;
goto ret;
}
buff = mmap(NULL, s.st_size, PROT_READ, MAP_SHARED, fd, 0);
if(buff == MAP_FAILED) {
OUTPUT_FAILURE("map")
close(fd);
code = -1;
goto ret;
}
archive_write_data(this->a, buff, s.st_size);
close(fd);
}
archive_write_finish_entry(this->a);
archive_entry_clear(entry);
}
output_info("tar backend", "archive created", this->out_path);
ret:
archive_entry_free(entry);
return code;
}
int finalise() override {
archive_write_close(a);
archive_write_free(a);
return 0;
}
void cleanup() override {
/* We call umount during creation to avoid including the dirs in the tarball,
* so we don't need the default cleanup to run. */
return;
}
};
__attribute__((constructor(400)))
void register_tar_backend() {
BackendManager::register_backend(
{"tar", "Create a tarball (.tar)",
[](const std::string &ir_dir, const std::string &out_path,
const std::map<std::string, std::string> &opts) {
return new TarBackend(ir_dir, out_path, opts);
}
});
BackendManager::register_backend(
{"tgz", "Create a tarball with GZ compression (.tar.gz)",
[](const std::string &ir_dir, const std::string &out_path,
const std::map<std::string, std::string> &opts) {
return new TarBackend(ir_dir, out_path, opts, TarBackend::GZip);
}
});
BackendManager::register_backend(
{"tbz", "Create a tarball with BZip2 compression (.tar.bz2)",
[](const std::string &ir_dir, const std::string &out_path,
const std::map<std::string, std::string> &opts) {
return new TarBackend(ir_dir, out_path, opts, TarBackend::BZip2);
}
});
BackendManager::register_backend(
{"txz", "Create a tarball with XZ compression (.tar.xz)",
[](const std::string &ir_dir, const std::string &out_path,
const std::map<std::string, std::string> &opts) {
return new TarBackend(ir_dir, out_path, opts, TarBackend::XZ);
}
});
}
}
}
|
