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Commit | Line | Data |
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3d74982f RS |
1 | /* |
2 | * Copyright (c) 2005, 2006 Rene Scharfe | |
3 | */ | |
3d74982f | 4 | #include "cache.h" |
3d74982f | 5 | #include "tar.h" |
3d74982f | 6 | #include "archive.h" |
5544049d | 7 | #include "streaming.h" |
767cf457 | 8 | #include "run-command.h" |
3d74982f RS |
9 | |
10 | #define RECORDSIZE (512) | |
11 | #define BLOCKSIZE (RECORDSIZE * 20) | |
12 | ||
13 | static char block[BLOCKSIZE]; | |
14 | static unsigned long offset; | |
15 | ||
f08b3b0e | 16 | static int tar_umask = 002; |
3d74982f | 17 | |
767cf457 JK |
18 | static int write_tar_filter_archive(const struct archiver *ar, |
19 | struct archiver_args *args); | |
20 | ||
3d74982f RS |
21 | /* writes out the whole block, but only if it is full */ |
22 | static void write_if_needed(void) | |
23 | { | |
24 | if (offset == BLOCKSIZE) { | |
25 | write_or_die(1, block, BLOCKSIZE); | |
26 | offset = 0; | |
27 | } | |
28 | } | |
29 | ||
30 | /* | |
31 | * queues up writes, so that all our write(2) calls write exactly one | |
32 | * full block; pads writes to RECORDSIZE | |
33 | */ | |
5544049d | 34 | static void do_write_blocked(const void *data, unsigned long size) |
3d74982f RS |
35 | { |
36 | const char *buf = data; | |
3d74982f RS |
37 | |
38 | if (offset) { | |
39 | unsigned long chunk = BLOCKSIZE - offset; | |
40 | if (size < chunk) | |
41 | chunk = size; | |
42 | memcpy(block + offset, buf, chunk); | |
43 | size -= chunk; | |
44 | offset += chunk; | |
45 | buf += chunk; | |
46 | write_if_needed(); | |
47 | } | |
48 | while (size >= BLOCKSIZE) { | |
49 | write_or_die(1, buf, BLOCKSIZE); | |
50 | size -= BLOCKSIZE; | |
51 | buf += BLOCKSIZE; | |
52 | } | |
53 | if (size) { | |
54 | memcpy(block + offset, buf, size); | |
55 | offset += size; | |
56 | } | |
5544049d NTND |
57 | } |
58 | ||
59 | static void finish_record(void) | |
60 | { | |
61 | unsigned long tail; | |
3d74982f RS |
62 | tail = offset % RECORDSIZE; |
63 | if (tail) { | |
64 | memset(block + offset, 0, RECORDSIZE - tail); | |
65 | offset += RECORDSIZE - tail; | |
66 | } | |
67 | write_if_needed(); | |
68 | } | |
69 | ||
5544049d NTND |
70 | static void write_blocked(const void *data, unsigned long size) |
71 | { | |
72 | do_write_blocked(data, size); | |
73 | finish_record(); | |
74 | } | |
75 | ||
3d74982f RS |
76 | /* |
77 | * The end of tar archives is marked by 2*512 nul bytes and after that | |
78 | * follows the rest of the block (if any). | |
79 | */ | |
80 | static void write_trailer(void) | |
81 | { | |
82 | int tail = BLOCKSIZE - offset; | |
83 | memset(block + offset, 0, tail); | |
84 | write_or_die(1, block, BLOCKSIZE); | |
85 | if (tail < 2 * RECORDSIZE) { | |
86 | memset(block, 0, offset); | |
87 | write_or_die(1, block, BLOCKSIZE); | |
88 | } | |
89 | } | |
90 | ||
5544049d NTND |
91 | /* |
92 | * queues up writes, so that all our write(2) calls write exactly one | |
93 | * full block; pads writes to RECORDSIZE | |
94 | */ | |
95 | static int stream_blocked(const unsigned char *sha1) | |
96 | { | |
97 | struct git_istream *st; | |
98 | enum object_type type; | |
99 | unsigned long sz; | |
100 | char buf[BLOCKSIZE]; | |
101 | ssize_t readlen; | |
102 | ||
103 | st = open_istream(sha1, &type, &sz, NULL); | |
104 | if (!st) | |
105 | return error("cannot stream blob %s", sha1_to_hex(sha1)); | |
106 | for (;;) { | |
107 | readlen = read_istream(st, buf, sizeof(buf)); | |
108 | if (readlen <= 0) | |
109 | break; | |
110 | do_write_blocked(buf, readlen); | |
111 | } | |
112 | close_istream(st); | |
113 | if (!readlen) | |
114 | finish_record(); | |
115 | return readlen; | |
116 | } | |
117 | ||
3d74982f RS |
118 | /* |
119 | * pax extended header records have the format "%u %s=%s\n". %u contains | |
120 | * the size of the whole string (including the %u), the first %s is the | |
121 | * keyword, the second one is the value. This function constructs such a | |
122 | * string and appends it to a struct strbuf. | |
123 | */ | |
124 | static void strbuf_append_ext_header(struct strbuf *sb, const char *keyword, | |
125 | const char *value, unsigned int valuelen) | |
126 | { | |
7a604f16 | 127 | int len, tmp; |
3d74982f RS |
128 | |
129 | /* "%u %s=%s\n" */ | |
130 | len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1; | |
131 | for (tmp = len; tmp > 9; tmp /= 10) | |
132 | len++; | |
133 | ||
7a604f16 PH |
134 | strbuf_grow(sb, len); |
135 | strbuf_addf(sb, "%u %s=", len, keyword); | |
136 | strbuf_add(sb, value, valuelen); | |
137 | strbuf_addch(sb, '\n'); | |
3d74982f RS |
138 | } |
139 | ||
140 | static unsigned int ustar_header_chksum(const struct ustar_header *header) | |
141 | { | |
a5a46eb9 | 142 | const unsigned char *p = (const unsigned char *)header; |
3d74982f | 143 | unsigned int chksum = 0; |
a5a46eb9 | 144 | while (p < (const unsigned char *)header->chksum) |
3d74982f RS |
145 | chksum += *p++; |
146 | chksum += sizeof(header->chksum) * ' '; | |
147 | p += sizeof(header->chksum); | |
a5a46eb9 | 148 | while (p < (const unsigned char *)header + sizeof(struct ustar_header)) |
3d74982f RS |
149 | chksum += *p++; |
150 | return chksum; | |
151 | } | |
152 | ||
562e25ab | 153 | static size_t get_path_prefix(const char *path, size_t pathlen, size_t maxlen) |
3d74982f | 154 | { |
562e25ab | 155 | size_t i = pathlen; |
22f0dcd9 RS |
156 | if (i > 1 && path[i - 1] == '/') |
157 | i--; | |
3d74982f RS |
158 | if (i > maxlen) |
159 | i = maxlen; | |
160 | do { | |
161 | i--; | |
562e25ab | 162 | } while (i > 0 && path[i] != '/'); |
3d74982f RS |
163 | return i; |
164 | } | |
165 | ||
d240d410 NTND |
166 | static void prepare_header(struct archiver_args *args, |
167 | struct ustar_header *header, | |
168 | unsigned int mode, unsigned long size) | |
169 | { | |
170 | sprintf(header->mode, "%07o", mode & 07777); | |
171 | sprintf(header->size, "%011lo", S_ISREG(mode) ? size : 0); | |
172 | sprintf(header->mtime, "%011lo", (unsigned long) args->time); | |
173 | ||
174 | sprintf(header->uid, "%07o", 0); | |
175 | sprintf(header->gid, "%07o", 0); | |
176 | strlcpy(header->uname, "root", sizeof(header->uname)); | |
177 | strlcpy(header->gname, "root", sizeof(header->gname)); | |
178 | sprintf(header->devmajor, "%07o", 0); | |
179 | sprintf(header->devminor, "%07o", 0); | |
180 | ||
181 | memcpy(header->magic, "ustar", 6); | |
182 | memcpy(header->version, "00", 2); | |
183 | ||
184 | sprintf(header->chksum, "%07o", ustar_header_chksum(header)); | |
185 | } | |
186 | ||
187 | static int write_extended_header(struct archiver_args *args, | |
188 | const unsigned char *sha1, | |
189 | const void *buffer, unsigned long size) | |
190 | { | |
191 | struct ustar_header header; | |
192 | unsigned int mode; | |
193 | memset(&header, 0, sizeof(header)); | |
194 | *header.typeflag = TYPEFLAG_EXT_HEADER; | |
195 | mode = 0100666; | |
196 | sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1)); | |
197 | prepare_header(args, &header, mode, size); | |
198 | write_blocked(&header, sizeof(header)); | |
199 | write_blocked(buffer, size); | |
200 | return 0; | |
201 | } | |
202 | ||
562e25ab | 203 | static int write_tar_entry(struct archiver_args *args, |
9cb513b7 NTND |
204 | const unsigned char *sha1, |
205 | const char *path, size_t pathlen, | |
206 | unsigned int mode) | |
3d74982f RS |
207 | { |
208 | struct ustar_header header; | |
f285a2d7 | 209 | struct strbuf ext_header = STRBUF_INIT; |
9cb513b7 NTND |
210 | unsigned int old_mode = mode; |
211 | unsigned long size; | |
212 | void *buffer; | |
562e25ab | 213 | int err = 0; |
3d74982f RS |
214 | |
215 | memset(&header, 0, sizeof(header)); | |
3d74982f | 216 | |
85390709 NTND |
217 | if (S_ISDIR(mode) || S_ISGITLINK(mode)) { |
218 | *header.typeflag = TYPEFLAG_DIR; | |
219 | mode = (mode | 0777) & ~tar_umask; | |
220 | } else if (S_ISLNK(mode)) { | |
221 | *header.typeflag = TYPEFLAG_LNK; | |
222 | mode |= 0777; | |
223 | } else if (S_ISREG(mode)) { | |
224 | *header.typeflag = TYPEFLAG_REG; | |
225 | mode = (mode | ((mode & 0100) ? 0777 : 0666)) & ~tar_umask; | |
3d74982f | 226 | } else { |
85390709 NTND |
227 | return error("unsupported file mode: 0%o (SHA1: %s)", |
228 | mode, sha1_to_hex(sha1)); | |
229 | } | |
230 | if (pathlen > sizeof(header.name)) { | |
231 | size_t plen = get_path_prefix(path, pathlen, | |
232 | sizeof(header.prefix)); | |
233 | size_t rest = pathlen - plen - 1; | |
234 | if (plen > 0 && rest <= sizeof(header.name)) { | |
235 | memcpy(header.prefix, path, plen); | |
236 | memcpy(header.name, path + plen + 1, rest); | |
3d74982f | 237 | } else { |
85390709 NTND |
238 | sprintf(header.name, "%s.data", |
239 | sha1_to_hex(sha1)); | |
240 | strbuf_append_ext_header(&ext_header, "path", | |
241 | path, pathlen); | |
3d74982f | 242 | } |
85390709 NTND |
243 | } else |
244 | memcpy(header.name, path, pathlen); | |
3d74982f | 245 | |
5544049d NTND |
246 | if (S_ISREG(mode) && !args->convert && |
247 | sha1_object_info(sha1, &size) == OBJ_BLOB && | |
248 | size > big_file_threshold) | |
249 | buffer = NULL; | |
250 | else if (S_ISLNK(mode) || S_ISREG(mode)) { | |
9cb513b7 NTND |
251 | enum object_type type; |
252 | buffer = sha1_file_to_archive(args, path, sha1, old_mode, &type, &size); | |
253 | if (!buffer) | |
254 | return error("cannot read %s", sha1_to_hex(sha1)); | |
255 | } else { | |
256 | buffer = NULL; | |
257 | size = 0; | |
258 | } | |
259 | ||
260 | if (S_ISLNK(mode)) { | |
3d74982f RS |
261 | if (size > sizeof(header.linkname)) { |
262 | sprintf(header.linkname, "see %s.paxheader", | |
263 | sha1_to_hex(sha1)); | |
264 | strbuf_append_ext_header(&ext_header, "linkpath", | |
265 | buffer, size); | |
266 | } else | |
267 | memcpy(header.linkname, buffer, size); | |
268 | } | |
269 | ||
d240d410 | 270 | prepare_header(args, &header, mode, size); |
3d74982f RS |
271 | |
272 | if (ext_header.len > 0) { | |
d240d410 NTND |
273 | err = write_extended_header(args, sha1, ext_header.buf, |
274 | ext_header.len); | |
9cb513b7 NTND |
275 | if (err) { |
276 | free(buffer); | |
562e25ab | 277 | return err; |
9cb513b7 | 278 | } |
3d74982f | 279 | } |
7a604f16 | 280 | strbuf_release(&ext_header); |
3d74982f | 281 | write_blocked(&header, sizeof(header)); |
5544049d NTND |
282 | if (S_ISREG(mode) && size > 0) { |
283 | if (buffer) | |
284 | write_blocked(buffer, size); | |
285 | else | |
286 | err = stream_blocked(sha1); | |
287 | } | |
9cb513b7 | 288 | free(buffer); |
562e25ab | 289 | return err; |
3d74982f RS |
290 | } |
291 | ||
562e25ab | 292 | static int write_global_extended_header(struct archiver_args *args) |
3d74982f | 293 | { |
562e25ab | 294 | const unsigned char *sha1 = args->commit_sha1; |
f285a2d7 | 295 | struct strbuf ext_header = STRBUF_INIT; |
d240d410 NTND |
296 | struct ustar_header header; |
297 | unsigned int mode; | |
298 | int err = 0; | |
7a604f16 | 299 | |
3d74982f | 300 | strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40); |
d240d410 NTND |
301 | memset(&header, 0, sizeof(header)); |
302 | *header.typeflag = TYPEFLAG_GLOBAL_HEADER; | |
303 | mode = 0100666; | |
304 | strcpy(header.name, "pax_global_header"); | |
305 | prepare_header(args, &header, mode, ext_header.len); | |
306 | write_blocked(&header, sizeof(header)); | |
307 | write_blocked(ext_header.buf, ext_header.len); | |
7a604f16 | 308 | strbuf_release(&ext_header); |
562e25ab | 309 | return err; |
3d74982f RS |
310 | } |
311 | ||
767cf457 JK |
312 | static struct archiver **tar_filters; |
313 | static int nr_tar_filters; | |
314 | static int alloc_tar_filters; | |
315 | ||
316 | static struct archiver *find_tar_filter(const char *name, int len) | |
317 | { | |
318 | int i; | |
319 | for (i = 0; i < nr_tar_filters; i++) { | |
320 | struct archiver *ar = tar_filters[i]; | |
321 | if (!strncmp(ar->name, name, len) && !ar->name[len]) | |
322 | return ar; | |
323 | } | |
324 | return NULL; | |
325 | } | |
326 | ||
327 | static int tar_filter_config(const char *var, const char *value, void *data) | |
328 | { | |
329 | struct archiver *ar; | |
767cf457 JK |
330 | const char *name; |
331 | const char *type; | |
332 | int namelen; | |
333 | ||
785a0429 | 334 | if (parse_config_key(var, "tar", &name, &namelen, &type) < 0 || !name) |
767cf457 | 335 | return 0; |
767cf457 JK |
336 | |
337 | ar = find_tar_filter(name, namelen); | |
338 | if (!ar) { | |
339 | ar = xcalloc(1, sizeof(*ar)); | |
340 | ar->name = xmemdupz(name, namelen); | |
341 | ar->write_archive = write_tar_filter_archive; | |
342 | ar->flags = ARCHIVER_WANT_COMPRESSION_LEVELS; | |
343 | ALLOC_GROW(tar_filters, nr_tar_filters + 1, alloc_tar_filters); | |
344 | tar_filters[nr_tar_filters++] = ar; | |
345 | } | |
346 | ||
347 | if (!strcmp(type, "command")) { | |
348 | if (!value) | |
349 | return config_error_nonbool(var); | |
350 | free(ar->data); | |
351 | ar->data = xstrdup(value); | |
352 | return 0; | |
353 | } | |
7b97730b JK |
354 | if (!strcmp(type, "remote")) { |
355 | if (git_config_bool(var, value)) | |
356 | ar->flags |= ARCHIVER_REMOTE; | |
357 | else | |
358 | ar->flags &= ~ARCHIVER_REMOTE; | |
359 | return 0; | |
360 | } | |
767cf457 JK |
361 | |
362 | return 0; | |
363 | } | |
364 | ||
ef90d6d4 | 365 | static int git_tar_config(const char *var, const char *value, void *cb) |
3d74982f RS |
366 | { |
367 | if (!strcmp(var, "tar.umask")) { | |
cc1816b0 | 368 | if (value && !strcmp(value, "user")) { |
3d74982f RS |
369 | tar_umask = umask(0); |
370 | umask(tar_umask); | |
371 | } else { | |
372 | tar_umask = git_config_int(var, value); | |
373 | } | |
374 | return 0; | |
375 | } | |
767cf457 JK |
376 | |
377 | return tar_filter_config(var, value, cb); | |
3d74982f RS |
378 | } |
379 | ||
4d7c9898 JK |
380 | static int write_tar_archive(const struct archiver *ar, |
381 | struct archiver_args *args) | |
3d74982f | 382 | { |
562e25ab | 383 | int err = 0; |
3d74982f | 384 | |
3d74982f | 385 | if (args->commit_sha1) |
562e25ab RS |
386 | err = write_global_extended_header(args); |
387 | if (!err) | |
388 | err = write_archive_entries(args, write_tar_entry); | |
389 | if (!err) | |
390 | write_trailer(); | |
391 | return err; | |
3d74982f | 392 | } |
13e0f88d | 393 | |
767cf457 JK |
394 | static int write_tar_filter_archive(const struct archiver *ar, |
395 | struct archiver_args *args) | |
396 | { | |
397 | struct strbuf cmd = STRBUF_INIT; | |
398 | struct child_process filter; | |
399 | const char *argv[2]; | |
400 | int r; | |
401 | ||
402 | if (!ar->data) | |
403 | die("BUG: tar-filter archiver called with no filter defined"); | |
404 | ||
405 | strbuf_addstr(&cmd, ar->data); | |
406 | if (args->compression_level >= 0) | |
407 | strbuf_addf(&cmd, " -%d", args->compression_level); | |
408 | ||
409 | memset(&filter, 0, sizeof(filter)); | |
410 | argv[0] = cmd.buf; | |
411 | argv[1] = NULL; | |
412 | filter.argv = argv; | |
413 | filter.use_shell = 1; | |
414 | filter.in = -1; | |
415 | ||
416 | if (start_command(&filter) < 0) | |
417 | die_errno("unable to start '%s' filter", argv[0]); | |
418 | close(1); | |
419 | if (dup2(filter.in, 1) < 0) | |
420 | die_errno("unable to redirect descriptor"); | |
421 | close(filter.in); | |
422 | ||
423 | r = write_tar_archive(ar, args); | |
424 | ||
425 | close(1); | |
426 | if (finish_command(&filter) != 0) | |
427 | die("'%s' filter reported error", argv[0]); | |
428 | ||
429 | strbuf_release(&cmd); | |
430 | return r; | |
431 | } | |
432 | ||
13e0f88d JK |
433 | static struct archiver tar_archiver = { |
434 | "tar", | |
435 | write_tar_archive, | |
7b97730b | 436 | ARCHIVER_REMOTE |
13e0f88d JK |
437 | }; |
438 | ||
439 | void init_tar_archiver(void) | |
440 | { | |
767cf457 | 441 | int i; |
13e0f88d | 442 | register_archiver(&tar_archiver); |
767cf457 | 443 | |
0e804e09 | 444 | tar_filter_config("tar.tgz.command", "gzip -cn", NULL); |
7b97730b | 445 | tar_filter_config("tar.tgz.remote", "true", NULL); |
0e804e09 | 446 | tar_filter_config("tar.tar.gz.command", "gzip -cn", NULL); |
7b97730b | 447 | tar_filter_config("tar.tar.gz.remote", "true", NULL); |
13e0f88d | 448 | git_config(git_tar_config, NULL); |
767cf457 JK |
449 | for (i = 0; i < nr_tar_filters; i++) { |
450 | /* omit any filters that never had a command configured */ | |
451 | if (tar_filters[i]->data) | |
452 | register_archiver(tar_filters[i]); | |
453 | } | |
13e0f88d | 454 | } |