Stop using static initialisation so that dcpomatic::write() can be called more than...
[dcpomatic.git] / src / lib / ext.cc
1 /*
2     Copyright (C) 2019-2020 Carl Hetherington <cth@carlh.net>
3
4     This file is part of DCP-o-matic.
5
6     DCP-o-matic is free software; you can redistribute it and/or modify
7     it under the terms of the GNU General Public License as published by
8     the Free Software Foundation; either version 2 of the License, or
9     (at your option) any later version.
10
11     DCP-o-matic is distributed in the hope that it will be useful,
12     but WITHOUT ANY WARRANTY; without even the implied warranty of
13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14     GNU General Public License for more details.
15
16     You should have received a copy of the GNU General Public License
17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
18
19 */
20
21
22 #include "compose.hpp"
23 #include "cross.h"
24 #include "dcpomatic_log.h"
25 #include "digester.h"
26 #include "disk_writer_messages.h"
27 #include "exceptions.h"
28 #include "ext.h"
29 #include "nanomsg.h"
30 #include <dcp/file.h>
31
32 #ifdef DCPOMATIC_LINUX
33 #include <linux/fs.h>
34 #include <sys/ioctl.h>
35 extern "C" {
36 #include <lwext4/file_dev.h>
37 }
38 #endif
39
40 #ifdef DCPOMATIC_OSX
41 extern "C" {
42 #include <lwext4/file_dev.h>
43 }
44 #endif
45
46 #ifdef DCPOMATIC_WINDOWS
47 extern "C" {
48 #include <lwext4/file_windows.h>
49 }
50 #endif
51
52 extern "C" {
53 #include <lwext4/ext4.h>
54 #include <lwext4/ext4_debug.h>
55 #include <lwext4/ext4_errno.h>
56 #include <lwext4/ext4_fs.h>
57 #include <lwext4/ext4_mbr.h>
58 #include <lwext4/ext4_mkfs.h>
59 }
60 #include <boost/filesystem.hpp>
61 #include <chrono>
62 #include <string>
63
64
65 using std::exception;
66 using std::min;
67 using std::string;
68 using std::vector;
69
70
71 #define SHORT_TIMEOUT 100
72 #define LONG_TIMEOUT 2000
73
74
75 /* Use quite a big block size here, as ext4's fwrite() has quite a bit of overhead */
76 uint64_t constexpr block_size = 4096 * 4096;
77
78
79 static
80 void
81 count (boost::filesystem::path dir, uint64_t& total_bytes)
82 {
83         dir = dcp::fix_long_path (dir);
84
85         using namespace boost::filesystem;
86         for (auto i: directory_iterator(dir)) {
87                 if (is_directory(i)) {
88                         count (i, total_bytes);
89                 } else {
90                         total_bytes += file_size (i);
91                 }
92         }
93 }
94
95
96 static
97 void
98 set_timestamps_to_now (boost::filesystem::path path)
99 {
100         auto const now = std::chrono::duration_cast<std::chrono::seconds>(std::chrono::system_clock::now().time_since_epoch()).count();
101         ext4_mtime_set (path.generic_string().c_str(), now);
102         ext4_ctime_set (path.generic_string().c_str(), now);
103         ext4_atime_set (path.generic_string().c_str(), now);
104 }
105
106
107 static
108 string
109 write (boost::filesystem::path from, boost::filesystem::path to, uint64_t& total_remaining, uint64_t total, Nanomsg* nanomsg)
110 {
111         ext4_file out;
112         int r = ext4_fopen(&out, to.generic_string().c_str(), "wb");
113         if (r != EOK) {
114                 throw CopyError (String::compose("Failed to open file %1", to.generic_string()), r);
115         }
116
117         dcp::File in(from, "rb");
118         if (!in) {
119                 ext4_fclose (&out);
120                 throw CopyError (String::compose("Failed to open file %1", from.string()), 0);
121         }
122
123         std::vector<uint8_t> buffer(block_size);
124         Digester digester;
125
126         int progress_frequency = 1;
127         int progress_count = 0;
128         uint64_t remaining = file_size (from);
129         while (remaining > 0) {
130                 uint64_t const this_time = min(remaining, block_size);
131                 size_t read = in.read(buffer.data(), 1, this_time);
132                 if (read != this_time) {
133                         ext4_fclose (&out);
134                         throw CopyError (String::compose("Short read; expected %1 but read %2", this_time, read), 0);
135                 }
136
137                 digester.add (buffer.data(), this_time);
138
139                 size_t written;
140                 r = ext4_fwrite (&out, buffer.data(), this_time, &written);
141                 if (r != EOK) {
142                         ext4_fclose (&out);
143                         throw CopyError ("Write failed", r);
144                 }
145                 if (written != this_time) {
146                         ext4_fclose (&out);
147                         throw CopyError (String::compose("Short write; expected %1 but wrote %2", this_time, written), 0);
148                 }
149                 remaining -= this_time;
150                 total_remaining -= this_time;
151
152                 ++progress_count;
153                 if ((progress_count % progress_frequency) == 0 && nanomsg) {
154                         nanomsg->send(String::compose(DISK_WRITER_COPY_PROGRESS "\n%1\n", (1 - float(total_remaining) / total)), SHORT_TIMEOUT);
155                 }
156         }
157
158         ext4_fclose (&out);
159
160         set_timestamps_to_now (to);
161
162         return digester.get ();
163 }
164
165
166 static
167 string
168 read (boost::filesystem::path from, boost::filesystem::path to, uint64_t& total_remaining, uint64_t total, Nanomsg* nanomsg)
169 {
170         ext4_file in;
171         LOG_DISK("Opening %1 for read", to.generic_string());
172         int r = ext4_fopen(&in, to.generic_string().c_str(), "rb");
173         if (r != EOK) {
174                 throw VerifyError (String::compose("Failed to open file %1", to.generic_string()), r);
175         }
176         LOG_DISK("Opened %1 for read", to.generic_string());
177
178         std::vector<uint8_t> buffer(block_size);
179         Digester digester;
180
181         uint64_t remaining = file_size (from);
182         while (remaining > 0) {
183                 uint64_t const this_time = min(remaining, block_size);
184                 size_t read;
185                 r = ext4_fread (&in, buffer.data(), this_time, &read);
186                 if (read != this_time) {
187                         ext4_fclose (&in);
188                         throw VerifyError (String::compose("Short read; expected %1 but read %2", this_time, read), 0);
189                 }
190
191                 digester.add (buffer.data(), this_time);
192                 remaining -= this_time;
193                 total_remaining -= this_time;
194                 if (nanomsg) {
195                         nanomsg->send(String::compose(DISK_WRITER_VERIFY_PROGRESS "\n%1\n", (1 - float(total_remaining) / total)), SHORT_TIMEOUT);
196                 }
197         }
198
199         ext4_fclose (&in);
200
201         return digester.get ();
202 }
203
204
205 class CopiedFile
206 {
207 public:
208         CopiedFile (boost::filesystem::path from_, boost::filesystem::path to_, string write_digest_)
209                 : from (from_)
210                 , to (to_)
211                 , write_digest (write_digest_)
212         {}
213
214         boost::filesystem::path from;
215         boost::filesystem::path to;
216         /** digest calculated from data as it was read from the source during write */
217         string write_digest;
218 };
219
220
221 /** @param from File to copy from.
222  *  @param to Directory to copy to.
223  */
224 static
225 void
226 copy (boost::filesystem::path from, boost::filesystem::path to, uint64_t& total_remaining, uint64_t total, vector<CopiedFile>& copied_files, Nanomsg* nanomsg)
227 {
228         LOG_DISK ("Copy %1 -> %2", from.string(), to.generic_string());
229         from = dcp::fix_long_path (from);
230
231         using namespace boost::filesystem;
232
233         path const cr = to / from.filename();
234
235         if (is_directory(from)) {
236                 int r = ext4_dir_mk (cr.generic_string().c_str());
237                 if (r != EOK) {
238                         throw CopyError (String::compose("Failed to create directory %1", cr.generic_string()), r);
239                 }
240                 set_timestamps_to_now (cr);
241
242                 for (auto i: directory_iterator(from)) {
243                         copy (i.path(), cr, total_remaining, total, copied_files, nanomsg);
244                 }
245         } else {
246                 string const write_digest = write (from, cr, total_remaining, total, nanomsg);
247                 LOG_DISK ("Wrote %1 %2 with %3", from.string(), cr.generic_string(), write_digest);
248                 copied_files.push_back (CopiedFile(from, cr, write_digest));
249         }
250 }
251
252
253 static
254 void
255 verify (vector<CopiedFile> const& copied_files, uint64_t total, Nanomsg* nanomsg)
256 {
257         uint64_t total_remaining = total;
258         for (auto const& i: copied_files) {
259                 string const read_digest = read (i.from, i.to, total_remaining, total, nanomsg);
260                 LOG_DISK ("Read %1 %2 was %3 on write, now %4", i.from.string(), i.to.generic_string(), i.write_digest, read_digest);
261                 if (read_digest != i.write_digest) {
262                         throw VerifyError ("Hash of written data is incorrect", 0);
263                 }
264         }
265 }
266
267
268 static
269 void
270 format_progress (void* context, float progress)
271 {
272         if (context) {
273                 reinterpret_cast<Nanomsg*>(context)->send(String::compose(DISK_WRITER_FORMAT_PROGRESS "\n%1\n", progress), SHORT_TIMEOUT);
274         }
275 }
276
277
278 void
279 #ifdef DCPOMATIC_WINDOWS
280 dcpomatic::write (boost::filesystem::path dcp_path, string device, string, Nanomsg* nanomsg)
281 #else
282 dcpomatic::write (boost::filesystem::path dcp_path, string device, string posix_partition, Nanomsg* nanomsg)
283 #endif
284 try
285 {
286         ext4_dmask_set (DEBUG_ALL);
287
288         struct ext4_fs fs;
289         fs.read_only = false;
290         fs.bdev = nullptr;
291         fs.last_inode_bg_id = 0;
292         fs.jbd_fs = nullptr;
293         fs.jbd_journal = nullptr;
294         fs.curr_trans = nullptr;
295         struct ext4_mkfs_info info;
296         info.len = 0;
297         info.block_size = 4096;
298         info.blocks_per_group = 0;
299         info.inode_size = 128;
300         info.inodes = 0;
301         info.journal_blocks = 0;
302         info.dsc_size = 0;
303         for (int i = 0; i < UUID_SIZE; ++i) {
304                 info.uuid[i] = rand() & 0xff;
305         }
306         info.journal = false;
307         info.label = nullptr;
308
309 #ifdef WIN32
310         file_windows_name_set(device.c_str());
311         struct ext4_blockdev* bd = file_windows_dev_get();
312 #else
313         file_dev_name_set (device.c_str());
314         struct ext4_blockdev* bd = file_dev_get ();
315 #endif
316
317         if (!bd) {
318                 throw CopyError ("Failed to open drive", 0);
319         }
320         LOG_DISK_NC ("Opened drive");
321
322         struct ext4_mbr_parts parts;
323         parts.division[0] = 100;
324         parts.division[1] = 0;
325         parts.division[2] = 0;
326         parts.division[3] = 0;
327
328         /* XXX: not sure if disk_id matters */
329         int r = ext4_mbr_write (bd, &parts, 0);
330         if (r) {
331                 throw CopyError ("Failed to write MBR", r);
332         }
333         LOG_DISK_NC ("Wrote MBR");
334
335         struct ext4_mbr_bdevs bdevs;
336         r = ext4_mbr_scan (bd, &bdevs);
337         if (r != EOK) {
338                 throw CopyError ("Failed to read MBR", r);
339         }
340
341 #ifdef DCPOMATIC_LINUX
342         /* Re-read the partition table */
343         int fd = open(device.c_str(), O_RDONLY);
344         ioctl(fd, BLKRRPART, NULL);
345         close(fd);
346 #endif
347
348         LOG_DISK ("Writing to partition at %1 size %2; bd part size is %3", bdevs.partitions[0].part_offset, bdevs.partitions[0].part_size, bd->part_size);
349
350 #ifdef DCPOMATIC_WINDOWS
351         file_windows_partition_set (bdevs.partitions[0].part_offset, bdevs.partitions[0].part_size);
352 #else
353         file_dev_name_set (posix_partition.c_str());
354
355         /* On macOS (at least) if you try to write to a drive that is sleeping the ext4_mkfs call
356          * below is liable to return EIO because it can't open the device.  Try to work around that
357          * here by opening and closing the device, waiting 5 seconds if it fails.
358          */
359         int wake = open(posix_partition.c_str(), O_RDWR);
360         if (wake == -1) {
361                 dcpomatic_sleep_seconds (5);
362         } else {
363                 close(wake);
364         }
365
366         bd = file_dev_get ();
367 #endif
368
369         if (!bd) {
370                 throw CopyError ("Failed to open partition", 0);
371         }
372         LOG_DISK_NC ("Opened partition");
373
374         r = ext4_mkfs(&fs, bd, &info, F_SET_EXT2, format_progress, nanomsg);
375         if (r != EOK) {
376                 throw CopyError ("Failed to make filesystem", r);
377         }
378         LOG_DISK_NC ("Made filesystem");
379
380         r = ext4_device_register(bd, "ext4_fs");
381         if (r != EOK) {
382                 throw CopyError ("Failed to register device", r);
383         }
384         LOG_DISK_NC ("Registered device");
385
386         r = ext4_mount("ext4_fs", "/mp/", false);
387         if (r != EOK) {
388                 throw CopyError ("Failed to mount device", r);
389         }
390         LOG_DISK_NC ("Mounted device");
391
392         uint64_t total_bytes = 0;
393         count (dcp_path, total_bytes);
394
395         uint64_t total_remaining = total_bytes;
396         vector<CopiedFile> copied_files;
397         copy (dcp_path, "/mp", total_remaining, total_bytes, copied_files, nanomsg);
398
399         /* Unmount and re-mount to make sure the write has finished */
400         r = ext4_umount("/mp/");
401         if (r != EOK) {
402                 throw CopyError ("Failed to unmount device", r);
403         }
404         r = ext4_mount("ext4_fs", "/mp/", false);
405         if (r != EOK) {
406                 throw CopyError ("Failed to mount device", r);
407         }
408         LOG_DISK_NC ("Re-mounted device");
409
410         verify (copied_files, total_bytes, nanomsg);
411
412         r = ext4_umount("/mp/");
413         if (r != EOK) {
414                 throw CopyError ("Failed to unmount device", r);
415         }
416
417         ext4_device_unregister("ext4_fs");
418         if (nanomsg && !nanomsg->send(DISK_WRITER_OK "\n", LONG_TIMEOUT)) {
419                 throw CommunicationFailedError ();
420         }
421
422         disk_write_finished ();
423 } catch (CopyError& e) {
424         LOG_DISK("CopyError (from write): %1 %2", e.message(), e.number().get_value_or(0));
425         if (nanomsg) {
426                 nanomsg->send(String::compose(DISK_WRITER_ERROR "\n%1\n%2\n", e.message(), e.number().get_value_or(0)), LONG_TIMEOUT);
427         }
428 } catch (VerifyError& e) {
429         LOG_DISK("VerifyError (from write): %1 %2", e.message(), e.number());
430         if (nanomsg) {
431                 nanomsg->send(String::compose(DISK_WRITER_ERROR "\n%1\n%2\n", e.message(), e.number()), LONG_TIMEOUT);
432         }
433 } catch (exception& e) {
434         LOG_DISK("Exception (from write): %1", e.what());
435         if (nanomsg) {
436                 nanomsg->send(String::compose(DISK_WRITER_ERROR "\n%1\n0\n", e.what()), LONG_TIMEOUT);
437         }
438 }
439
440