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Commit | Line | Data |
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3d74982f RS |
1 | /* |
2 | * Copyright (c) 2005, 2006 Rene Scharfe | |
3 | */ | |
36bf1958 | 4 | #include "git-compat-util.h" |
b2141fc1 | 5 | #include "config.h" |
f394e093 | 6 | #include "gettext.h" |
d88dbaa7 | 7 | #include "git-zlib.h" |
41771fa4 | 8 | #include "hex.h" |
3d74982f | 9 | #include "tar.h" |
3d74982f | 10 | #include "archive.h" |
a034e910 | 11 | #include "object-store-ll.h" |
5544049d | 12 | #include "streaming.h" |
767cf457 | 13 | #include "run-command.h" |
d48be35c | 14 | #include "write-or-die.h" |
3d74982f RS |
15 | |
16 | #define RECORDSIZE (512) | |
17 | #define BLOCKSIZE (RECORDSIZE * 20) | |
18 | ||
19 | static char block[BLOCKSIZE]; | |
20 | static unsigned long offset; | |
21 | ||
f08b3b0e | 22 | static int tar_umask = 002; |
3d74982f | 23 | |
767cf457 JK |
24 | static int write_tar_filter_archive(const struct archiver *ar, |
25 | struct archiver_args *args); | |
26 | ||
d1657b57 JK |
27 | /* |
28 | * This is the max value that a ustar size header can specify, as it is fixed | |
29 | * at 11 octal digits. POSIX specifies that we switch to extended headers at | |
30 | * this size. | |
6e8e0991 JK |
31 | * |
32 | * Likewise for the mtime (which happens to use a buffer of the same size). | |
d1657b57 | 33 | */ |
29493589 JH |
34 | #if ULONG_MAX == 0xFFFFFFFF |
35 | #define USTAR_MAX_SIZE ULONG_MAX | |
29493589 | 36 | #else |
3f789719 | 37 | #define USTAR_MAX_SIZE 077777777777UL |
dddbad72 JS |
38 | #endif |
39 | #if TIME_MAX == 0xFFFFFFFF | |
40 | #define USTAR_MAX_MTIME TIME_MAX | |
41 | #else | |
3f789719 | 42 | #define USTAR_MAX_MTIME 077777777777ULL |
29493589 | 43 | #endif |
d1657b57 | 44 | |
76d76026 | 45 | static void tar_write_block(const void *buf) |
dfce1186 RS |
46 | { |
47 | write_or_die(1, buf, BLOCKSIZE); | |
48 | } | |
49 | ||
76d76026 RS |
50 | static void (*write_block)(const void *) = tar_write_block; |
51 | ||
3d74982f RS |
52 | /* writes out the whole block, but only if it is full */ |
53 | static void write_if_needed(void) | |
54 | { | |
55 | if (offset == BLOCKSIZE) { | |
dfce1186 | 56 | write_block(block); |
3d74982f RS |
57 | offset = 0; |
58 | } | |
59 | } | |
60 | ||
61 | /* | |
62 | * queues up writes, so that all our write(2) calls write exactly one | |
63 | * full block; pads writes to RECORDSIZE | |
64 | */ | |
5544049d | 65 | static void do_write_blocked(const void *data, unsigned long size) |
3d74982f RS |
66 | { |
67 | const char *buf = data; | |
3d74982f RS |
68 | |
69 | if (offset) { | |
70 | unsigned long chunk = BLOCKSIZE - offset; | |
71 | if (size < chunk) | |
72 | chunk = size; | |
73 | memcpy(block + offset, buf, chunk); | |
74 | size -= chunk; | |
75 | offset += chunk; | |
76 | buf += chunk; | |
77 | write_if_needed(); | |
78 | } | |
79 | while (size >= BLOCKSIZE) { | |
dfce1186 | 80 | write_block(buf); |
3d74982f RS |
81 | size -= BLOCKSIZE; |
82 | buf += BLOCKSIZE; | |
83 | } | |
84 | if (size) { | |
85 | memcpy(block + offset, buf, size); | |
86 | offset += size; | |
87 | } | |
5544049d NTND |
88 | } |
89 | ||
90 | static void finish_record(void) | |
91 | { | |
92 | unsigned long tail; | |
3d74982f RS |
93 | tail = offset % RECORDSIZE; |
94 | if (tail) { | |
95 | memset(block + offset, 0, RECORDSIZE - tail); | |
96 | offset += RECORDSIZE - tail; | |
97 | } | |
98 | write_if_needed(); | |
99 | } | |
100 | ||
5544049d NTND |
101 | static void write_blocked(const void *data, unsigned long size) |
102 | { | |
103 | do_write_blocked(data, size); | |
104 | finish_record(); | |
105 | } | |
106 | ||
3d74982f RS |
107 | /* |
108 | * The end of tar archives is marked by 2*512 nul bytes and after that | |
109 | * follows the rest of the block (if any). | |
110 | */ | |
111 | static void write_trailer(void) | |
112 | { | |
113 | int tail = BLOCKSIZE - offset; | |
114 | memset(block + offset, 0, tail); | |
dfce1186 | 115 | write_block(block); |
3d74982f RS |
116 | if (tail < 2 * RECORDSIZE) { |
117 | memset(block, 0, offset); | |
dfce1186 | 118 | write_block(block); |
3d74982f RS |
119 | } |
120 | } | |
121 | ||
5544049d NTND |
122 | /* |
123 | * queues up writes, so that all our write(2) calls write exactly one | |
124 | * full block; pads writes to RECORDSIZE | |
125 | */ | |
c8123e72 | 126 | static int stream_blocked(struct repository *r, const struct object_id *oid) |
5544049d NTND |
127 | { |
128 | struct git_istream *st; | |
129 | enum object_type type; | |
130 | unsigned long sz; | |
131 | char buf[BLOCKSIZE]; | |
132 | ssize_t readlen; | |
133 | ||
c8123e72 | 134 | st = open_istream(r, oid, &type, &sz, NULL); |
5544049d | 135 | if (!st) |
d0482e69 | 136 | return error(_("cannot stream blob %s"), oid_to_hex(oid)); |
5544049d NTND |
137 | for (;;) { |
138 | readlen = read_istream(st, buf, sizeof(buf)); | |
139 | if (readlen <= 0) | |
140 | break; | |
141 | do_write_blocked(buf, readlen); | |
142 | } | |
143 | close_istream(st); | |
144 | if (!readlen) | |
145 | finish_record(); | |
146 | return readlen; | |
147 | } | |
148 | ||
3d74982f RS |
149 | /* |
150 | * pax extended header records have the format "%u %s=%s\n". %u contains | |
151 | * the size of the whole string (including the %u), the first %s is the | |
152 | * keyword, the second one is the value. This function constructs such a | |
153 | * string and appends it to a struct strbuf. | |
154 | */ | |
155 | static void strbuf_append_ext_header(struct strbuf *sb, const char *keyword, | |
17e9ef00 | 156 | const char *value, size_t valuelen) |
3d74982f | 157 | { |
4060c199 | 158 | size_t orig_len = sb->len; |
17e9ef00 | 159 | size_t len, tmp; |
3d74982f RS |
160 | |
161 | /* "%u %s=%s\n" */ | |
162 | len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1; | |
82a46af1 | 163 | for (tmp = 1; len / 10 >= tmp; tmp *= 10) |
3d74982f RS |
164 | len++; |
165 | ||
7a604f16 | 166 | strbuf_grow(sb, len); |
17e9ef00 | 167 | strbuf_addf(sb, "%"PRIuMAX" %s=", (uintmax_t)len, keyword); |
7a604f16 PH |
168 | strbuf_add(sb, value, valuelen); |
169 | strbuf_addch(sb, '\n'); | |
4060c199 RS |
170 | |
171 | if (len != sb->len - orig_len) | |
71d41ff6 RS |
172 | BUG("pax extended header length miscalculated as %"PRIuMAX |
173 | ", should be %"PRIuMAX, | |
174 | (uintmax_t)len, (uintmax_t)(sb->len - orig_len)); | |
3d74982f RS |
175 | } |
176 | ||
d1657b57 JK |
177 | /* |
178 | * Like strbuf_append_ext_header, but for numeric values. | |
179 | */ | |
180 | static void strbuf_append_ext_header_uint(struct strbuf *sb, | |
181 | const char *keyword, | |
182 | uintmax_t value) | |
183 | { | |
184 | char buf[40]; /* big enough for 2^128 in decimal, plus NUL */ | |
185 | int len; | |
186 | ||
187 | len = xsnprintf(buf, sizeof(buf), "%"PRIuMAX, value); | |
188 | strbuf_append_ext_header(sb, keyword, buf, len); | |
189 | } | |
190 | ||
3d74982f RS |
191 | static unsigned int ustar_header_chksum(const struct ustar_header *header) |
192 | { | |
a5a46eb9 | 193 | const unsigned char *p = (const unsigned char *)header; |
3d74982f | 194 | unsigned int chksum = 0; |
a5a46eb9 | 195 | while (p < (const unsigned char *)header->chksum) |
3d74982f RS |
196 | chksum += *p++; |
197 | chksum += sizeof(header->chksum) * ' '; | |
198 | p += sizeof(header->chksum); | |
a5a46eb9 | 199 | while (p < (const unsigned char *)header + sizeof(struct ustar_header)) |
3d74982f RS |
200 | chksum += *p++; |
201 | return chksum; | |
202 | } | |
203 | ||
562e25ab | 204 | static size_t get_path_prefix(const char *path, size_t pathlen, size_t maxlen) |
3d74982f | 205 | { |
562e25ab | 206 | size_t i = pathlen; |
22f0dcd9 RS |
207 | if (i > 1 && path[i - 1] == '/') |
208 | i--; | |
3d74982f RS |
209 | if (i > maxlen) |
210 | i = maxlen; | |
211 | do { | |
212 | i--; | |
562e25ab | 213 | } while (i > 0 && path[i] != '/'); |
3d74982f RS |
214 | return i; |
215 | } | |
216 | ||
d240d410 NTND |
217 | static void prepare_header(struct archiver_args *args, |
218 | struct ustar_header *header, | |
219 | unsigned int mode, unsigned long size) | |
220 | { | |
f2f02675 | 221 | xsnprintf(header->mode, sizeof(header->mode), "%07o", mode & 07777); |
ca473cef | 222 | xsnprintf(header->size, sizeof(header->size), "%011"PRIoMAX , S_ISREG(mode) ? (uintmax_t)size : (uintmax_t)0); |
f2f02675 | 223 | xsnprintf(header->mtime, sizeof(header->mtime), "%011lo", (unsigned long) args->time); |
d240d410 | 224 | |
f2f02675 JK |
225 | xsnprintf(header->uid, sizeof(header->uid), "%07o", 0); |
226 | xsnprintf(header->gid, sizeof(header->gid), "%07o", 0); | |
d240d410 NTND |
227 | strlcpy(header->uname, "root", sizeof(header->uname)); |
228 | strlcpy(header->gname, "root", sizeof(header->gname)); | |
f2f02675 JK |
229 | xsnprintf(header->devmajor, sizeof(header->devmajor), "%07o", 0); |
230 | xsnprintf(header->devminor, sizeof(header->devminor), "%07o", 0); | |
d240d410 NTND |
231 | |
232 | memcpy(header->magic, "ustar", 6); | |
233 | memcpy(header->version, "00", 2); | |
234 | ||
9e6c1e91 | 235 | xsnprintf(header->chksum, sizeof(header->chksum), "%07o", ustar_header_chksum(header)); |
d240d410 NTND |
236 | } |
237 | ||
560b0e8f | 238 | static void write_extended_header(struct archiver_args *args, |
015ff4f8 | 239 | const struct object_id *oid, |
560b0e8f | 240 | const void *buffer, unsigned long size) |
d240d410 NTND |
241 | { |
242 | struct ustar_header header; | |
243 | unsigned int mode; | |
244 | memset(&header, 0, sizeof(header)); | |
245 | *header.typeflag = TYPEFLAG_EXT_HEADER; | |
15c6ef7b | 246 | mode = 0100666; |
015ff4f8 | 247 | xsnprintf(header.name, sizeof(header.name), "%s.paxheader", oid_to_hex(oid)); |
d240d410 NTND |
248 | prepare_header(args, &header, mode, size); |
249 | write_blocked(&header, sizeof(header)); | |
250 | write_blocked(buffer, size); | |
d240d410 NTND |
251 | } |
252 | ||
562e25ab | 253 | static int write_tar_entry(struct archiver_args *args, |
015ff4f8 | 254 | const struct object_id *oid, |
9cb513b7 | 255 | const char *path, size_t pathlen, |
200589ab RS |
256 | unsigned int mode, |
257 | void *buffer, unsigned long size) | |
3d74982f RS |
258 | { |
259 | struct ustar_header header; | |
f285a2d7 | 260 | struct strbuf ext_header = STRBUF_INIT; |
200589ab | 261 | unsigned long size_in_header; |
562e25ab | 262 | int err = 0; |
3d74982f RS |
263 | |
264 | memset(&header, 0, sizeof(header)); | |
3d74982f | 265 | |
85390709 NTND |
266 | if (S_ISDIR(mode) || S_ISGITLINK(mode)) { |
267 | *header.typeflag = TYPEFLAG_DIR; | |
268 | mode = (mode | 0777) & ~tar_umask; | |
269 | } else if (S_ISLNK(mode)) { | |
270 | *header.typeflag = TYPEFLAG_LNK; | |
271 | mode |= 0777; | |
272 | } else if (S_ISREG(mode)) { | |
273 | *header.typeflag = TYPEFLAG_REG; | |
274 | mode = (mode | ((mode & 0100) ? 0777 : 0666)) & ~tar_umask; | |
3d74982f | 275 | } else { |
d0482e69 | 276 | return error(_("unsupported file mode: 0%o (SHA1: %s)"), |
015ff4f8 | 277 | mode, oid_to_hex(oid)); |
85390709 NTND |
278 | } |
279 | if (pathlen > sizeof(header.name)) { | |
280 | size_t plen = get_path_prefix(path, pathlen, | |
281 | sizeof(header.prefix)); | |
282 | size_t rest = pathlen - plen - 1; | |
283 | if (plen > 0 && rest <= sizeof(header.name)) { | |
284 | memcpy(header.prefix, path, plen); | |
108332c7 | 285 | memcpy(header.name, path + plen + 1, rest); |
3d74982f | 286 | } else { |
f2f02675 | 287 | xsnprintf(header.name, sizeof(header.name), "%s.data", |
015ff4f8 | 288 | oid_to_hex(oid)); |
85390709 NTND |
289 | strbuf_append_ext_header(&ext_header, "path", |
290 | path, pathlen); | |
3d74982f | 291 | } |
85390709 NTND |
292 | } else |
293 | memcpy(header.name, path, pathlen); | |
3d74982f | 294 | |
9cb513b7 | 295 | if (S_ISLNK(mode)) { |
3d74982f | 296 | if (size > sizeof(header.linkname)) { |
f2f02675 | 297 | xsnprintf(header.linkname, sizeof(header.linkname), |
015ff4f8 | 298 | "see %s.paxheader", oid_to_hex(oid)); |
3d74982f RS |
299 | strbuf_append_ext_header(&ext_header, "linkpath", |
300 | buffer, size); | |
301 | } else | |
302 | memcpy(header.linkname, buffer, size); | |
303 | } | |
304 | ||
d1657b57 JK |
305 | size_in_header = size; |
306 | if (S_ISREG(mode) && size > USTAR_MAX_SIZE) { | |
307 | size_in_header = 0; | |
308 | strbuf_append_ext_header_uint(&ext_header, "size", size); | |
309 | } | |
310 | ||
311 | prepare_header(args, &header, mode, size_in_header); | |
3d74982f RS |
312 | |
313 | if (ext_header.len > 0) { | |
015ff4f8 | 314 | write_extended_header(args, oid, ext_header.buf, |
560b0e8f | 315 | ext_header.len); |
3d74982f | 316 | } |
7a604f16 | 317 | strbuf_release(&ext_header); |
3d74982f | 318 | write_blocked(&header, sizeof(header)); |
5544049d NTND |
319 | if (S_ISREG(mode) && size > 0) { |
320 | if (buffer) | |
321 | write_blocked(buffer, size); | |
322 | else | |
c8123e72 | 323 | err = stream_blocked(args->repo, oid); |
5544049d | 324 | } |
562e25ab | 325 | return err; |
3d74982f RS |
326 | } |
327 | ||
5caeeb83 | 328 | static void write_global_extended_header(struct archiver_args *args) |
3d74982f | 329 | { |
bbf05cf7 | 330 | const struct object_id *oid = args->commit_oid; |
f285a2d7 | 331 | struct strbuf ext_header = STRBUF_INIT; |
d240d410 NTND |
332 | struct ustar_header header; |
333 | unsigned int mode; | |
7a604f16 | 334 | |
bbf05cf7 | 335 | if (oid) |
6e8e0991 | 336 | strbuf_append_ext_header(&ext_header, "comment", |
bbf05cf7 | 337 | oid_to_hex(oid), |
338 | the_hash_algo->hexsz); | |
6e8e0991 JK |
339 | if (args->time > USTAR_MAX_MTIME) { |
340 | strbuf_append_ext_header_uint(&ext_header, "mtime", | |
341 | args->time); | |
342 | args->time = USTAR_MAX_MTIME; | |
343 | } | |
344 | ||
345 | if (!ext_header.len) | |
5caeeb83 | 346 | return; |
6e8e0991 | 347 | |
d240d410 NTND |
348 | memset(&header, 0, sizeof(header)); |
349 | *header.typeflag = TYPEFLAG_GLOBAL_HEADER; | |
15c6ef7b | 350 | mode = 0100666; |
5096d490 | 351 | xsnprintf(header.name, sizeof(header.name), "pax_global_header"); |
d240d410 NTND |
352 | prepare_header(args, &header, mode, ext_header.len); |
353 | write_blocked(&header, sizeof(header)); | |
354 | write_blocked(ext_header.buf, ext_header.len); | |
7a604f16 | 355 | strbuf_release(&ext_header); |
3d74982f RS |
356 | } |
357 | ||
767cf457 JK |
358 | static struct archiver **tar_filters; |
359 | static int nr_tar_filters; | |
360 | static int alloc_tar_filters; | |
361 | ||
f5914f4b | 362 | static struct archiver *find_tar_filter(const char *name, size_t len) |
767cf457 JK |
363 | { |
364 | int i; | |
365 | for (i = 0; i < nr_tar_filters; i++) { | |
366 | struct archiver *ar = tar_filters[i]; | |
367 | if (!strncmp(ar->name, name, len) && !ar->name[len]) | |
368 | return ar; | |
369 | } | |
370 | return NULL; | |
371 | } | |
372 | ||
783a86c1 | 373 | static int tar_filter_config(const char *var, const char *value, |
5cf88fd8 | 374 | void *data UNUSED) |
767cf457 JK |
375 | { |
376 | struct archiver *ar; | |
767cf457 JK |
377 | const char *name; |
378 | const char *type; | |
f5914f4b | 379 | size_t namelen; |
767cf457 | 380 | |
785a0429 | 381 | if (parse_config_key(var, "tar", &name, &namelen, &type) < 0 || !name) |
767cf457 | 382 | return 0; |
767cf457 JK |
383 | |
384 | ar = find_tar_filter(name, namelen); | |
385 | if (!ar) { | |
ca56dadb | 386 | CALLOC_ARRAY(ar, 1); |
767cf457 JK |
387 | ar->name = xmemdupz(name, namelen); |
388 | ar->write_archive = write_tar_filter_archive; | |
cde8ea9c RS |
389 | ar->flags = ARCHIVER_WANT_COMPRESSION_LEVELS | |
390 | ARCHIVER_HIGH_COMPRESSION_LEVELS; | |
767cf457 JK |
391 | ALLOC_GROW(tar_filters, nr_tar_filters + 1, alloc_tar_filters); |
392 | tar_filters[nr_tar_filters++] = ar; | |
393 | } | |
394 | ||
395 | if (!strcmp(type, "command")) { | |
396 | if (!value) | |
397 | return config_error_nonbool(var); | |
96b9e515 RS |
398 | free(ar->filter_command); |
399 | ar->filter_command = xstrdup(value); | |
767cf457 JK |
400 | return 0; |
401 | } | |
7b97730b JK |
402 | if (!strcmp(type, "remote")) { |
403 | if (git_config_bool(var, value)) | |
404 | ar->flags |= ARCHIVER_REMOTE; | |
405 | else | |
406 | ar->flags &= ~ARCHIVER_REMOTE; | |
407 | return 0; | |
408 | } | |
767cf457 JK |
409 | |
410 | return 0; | |
411 | } | |
412 | ||
a4e7e317 | 413 | static int git_tar_config(const char *var, const char *value, |
8868b1eb | 414 | const struct config_context *ctx, void *cb) |
3d74982f RS |
415 | { |
416 | if (!strcmp(var, "tar.umask")) { | |
cc1816b0 | 417 | if (value && !strcmp(value, "user")) { |
3d74982f RS |
418 | tar_umask = umask(0); |
419 | umask(tar_umask); | |
420 | } else { | |
8868b1eb | 421 | tar_umask = git_config_int(var, value, ctx->kvi); |
3d74982f RS |
422 | } |
423 | return 0; | |
424 | } | |
767cf457 JK |
425 | |
426 | return tar_filter_config(var, value, cb); | |
3d74982f RS |
427 | } |
428 | ||
5cf88fd8 | 429 | static int write_tar_archive(const struct archiver *ar UNUSED, |
4d7c9898 | 430 | struct archiver_args *args) |
3d74982f | 431 | { |
562e25ab | 432 | int err = 0; |
3d74982f | 433 | |
5caeeb83 JK |
434 | write_global_extended_header(args); |
435 | err = write_archive_entries(args, write_tar_entry); | |
562e25ab RS |
436 | if (!err) |
437 | write_trailer(); | |
438 | return err; | |
3d74982f | 439 | } |
13e0f88d | 440 | |
76d76026 RS |
441 | static git_zstream gzstream; |
442 | static unsigned char outbuf[16384]; | |
443 | ||
444 | static void tgz_deflate(int flush) | |
445 | { | |
446 | while (gzstream.avail_in || flush == Z_FINISH) { | |
447 | int status = git_deflate(&gzstream, flush); | |
448 | if (!gzstream.avail_out || status == Z_STREAM_END) { | |
449 | write_or_die(1, outbuf, gzstream.next_out - outbuf); | |
450 | gzstream.next_out = outbuf; | |
451 | gzstream.avail_out = sizeof(outbuf); | |
452 | if (status == Z_STREAM_END) | |
453 | break; | |
454 | } | |
455 | if (status != Z_OK && status != Z_BUF_ERROR) | |
456 | die(_("deflate error (%d)"), status); | |
457 | } | |
458 | } | |
459 | ||
460 | static void tgz_write_block(const void *data) | |
461 | { | |
462 | gzstream.next_in = (void *)data; | |
463 | gzstream.avail_in = BLOCKSIZE; | |
464 | tgz_deflate(Z_NO_FLUSH); | |
465 | } | |
466 | ||
467 | static const char internal_gzip_command[] = "git archive gzip"; | |
468 | ||
767cf457 JK |
469 | static int write_tar_filter_archive(const struct archiver *ar, |
470 | struct archiver_args *args) | |
471 | { | |
23fcf8b0 RS |
472 | #if ZLIB_VERNUM >= 0x1221 |
473 | struct gz_header_s gzhead = { .os = 3 }; /* Unix, for reproducibility */ | |
474 | #endif | |
767cf457 | 475 | struct strbuf cmd = STRBUF_INIT; |
d3180279 | 476 | struct child_process filter = CHILD_PROCESS_INIT; |
767cf457 JK |
477 | int r; |
478 | ||
96b9e515 | 479 | if (!ar->filter_command) |
033abf97 | 480 | BUG("tar-filter archiver called with no filter defined"); |
767cf457 | 481 | |
76d76026 RS |
482 | if (!strcmp(ar->filter_command, internal_gzip_command)) { |
483 | write_block = tgz_write_block; | |
484 | git_deflate_init_gzip(&gzstream, args->compression_level); | |
23fcf8b0 RS |
485 | #if ZLIB_VERNUM >= 0x1221 |
486 | if (deflateSetHeader(&gzstream.z, &gzhead) != Z_OK) | |
487 | BUG("deflateSetHeader() called too late"); | |
488 | #endif | |
76d76026 RS |
489 | gzstream.next_out = outbuf; |
490 | gzstream.avail_out = sizeof(outbuf); | |
491 | ||
492 | r = write_tar_archive(ar, args); | |
493 | ||
494 | tgz_deflate(Z_FINISH); | |
495 | git_deflate_end(&gzstream); | |
496 | return r; | |
497 | } | |
498 | ||
96b9e515 | 499 | strbuf_addstr(&cmd, ar->filter_command); |
767cf457 JK |
500 | if (args->compression_level >= 0) |
501 | strbuf_addf(&cmd, " -%d", args->compression_level); | |
502 | ||
7f14609e | 503 | strvec_push(&filter.args, cmd.buf); |
767cf457 JK |
504 | filter.use_shell = 1; |
505 | filter.in = -1; | |
1e4ea950 | 506 | filter.silent_exec_failure = 1; |
767cf457 JK |
507 | |
508 | if (start_command(&filter) < 0) | |
7f14609e | 509 | die_errno(_("unable to start '%s' filter"), cmd.buf); |
767cf457 JK |
510 | close(1); |
511 | if (dup2(filter.in, 1) < 0) | |
d0482e69 | 512 | die_errno(_("unable to redirect descriptor")); |
767cf457 JK |
513 | close(filter.in); |
514 | ||
515 | r = write_tar_archive(ar, args); | |
516 | ||
517 | close(1); | |
518 | if (finish_command(&filter) != 0) | |
7f14609e | 519 | die(_("'%s' filter reported error"), cmd.buf); |
767cf457 JK |
520 | |
521 | strbuf_release(&cmd); | |
522 | return r; | |
523 | } | |
524 | ||
13e0f88d | 525 | static struct archiver tar_archiver = { |
4fbedd4d ÆAB |
526 | .name = "tar", |
527 | .write_archive = write_tar_archive, | |
528 | .flags = ARCHIVER_REMOTE, | |
13e0f88d JK |
529 | }; |
530 | ||
531 | void init_tar_archiver(void) | |
532 | { | |
767cf457 | 533 | int i; |
13e0f88d | 534 | register_archiver(&tar_archiver); |
767cf457 | 535 | |
4f4be00d | 536 | tar_filter_config("tar.tgz.command", internal_gzip_command, NULL); |
7b97730b | 537 | tar_filter_config("tar.tgz.remote", "true", NULL); |
4f4be00d | 538 | tar_filter_config("tar.tar.gz.command", internal_gzip_command, NULL); |
7b97730b | 539 | tar_filter_config("tar.tar.gz.remote", "true", NULL); |
13e0f88d | 540 | git_config(git_tar_config, NULL); |
767cf457 JK |
541 | for (i = 0; i < nr_tar_filters; i++) { |
542 | /* omit any filters that never had a command configured */ | |
96b9e515 | 543 | if (tar_filters[i]->filter_command) |
767cf457 JK |
544 | register_archiver(tar_filters[i]); |
545 | } | |
13e0f88d | 546 | } |