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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" |
767cf457 | 7 | #include "run-command.h" |
3d74982f RS |
8 | |
9 | #define RECORDSIZE (512) | |
10 | #define BLOCKSIZE (RECORDSIZE * 20) | |
11 | ||
12 | static char block[BLOCKSIZE]; | |
13 | static unsigned long offset; | |
14 | ||
f08b3b0e | 15 | static int tar_umask = 002; |
3d74982f | 16 | |
767cf457 JK |
17 | static int write_tar_filter_archive(const struct archiver *ar, |
18 | struct archiver_args *args); | |
19 | ||
3d74982f RS |
20 | /* writes out the whole block, but only if it is full */ |
21 | static void write_if_needed(void) | |
22 | { | |
23 | if (offset == BLOCKSIZE) { | |
24 | write_or_die(1, block, BLOCKSIZE); | |
25 | offset = 0; | |
26 | } | |
27 | } | |
28 | ||
29 | /* | |
30 | * queues up writes, so that all our write(2) calls write exactly one | |
31 | * full block; pads writes to RECORDSIZE | |
32 | */ | |
33 | static void write_blocked(const void *data, unsigned long size) | |
34 | { | |
35 | const char *buf = data; | |
36 | unsigned long tail; | |
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 | } | |
57 | tail = offset % RECORDSIZE; | |
58 | if (tail) { | |
59 | memset(block + offset, 0, RECORDSIZE - tail); | |
60 | offset += RECORDSIZE - tail; | |
61 | } | |
62 | write_if_needed(); | |
63 | } | |
64 | ||
65 | /* | |
66 | * The end of tar archives is marked by 2*512 nul bytes and after that | |
67 | * follows the rest of the block (if any). | |
68 | */ | |
69 | static void write_trailer(void) | |
70 | { | |
71 | int tail = BLOCKSIZE - offset; | |
72 | memset(block + offset, 0, tail); | |
73 | write_or_die(1, block, BLOCKSIZE); | |
74 | if (tail < 2 * RECORDSIZE) { | |
75 | memset(block, 0, offset); | |
76 | write_or_die(1, block, BLOCKSIZE); | |
77 | } | |
78 | } | |
79 | ||
3d74982f RS |
80 | /* |
81 | * pax extended header records have the format "%u %s=%s\n". %u contains | |
82 | * the size of the whole string (including the %u), the first %s is the | |
83 | * keyword, the second one is the value. This function constructs such a | |
84 | * string and appends it to a struct strbuf. | |
85 | */ | |
86 | static void strbuf_append_ext_header(struct strbuf *sb, const char *keyword, | |
87 | const char *value, unsigned int valuelen) | |
88 | { | |
7a604f16 | 89 | int len, tmp; |
3d74982f RS |
90 | |
91 | /* "%u %s=%s\n" */ | |
92 | len = 1 + 1 + strlen(keyword) + 1 + valuelen + 1; | |
93 | for (tmp = len; tmp > 9; tmp /= 10) | |
94 | len++; | |
95 | ||
7a604f16 PH |
96 | strbuf_grow(sb, len); |
97 | strbuf_addf(sb, "%u %s=", len, keyword); | |
98 | strbuf_add(sb, value, valuelen); | |
99 | strbuf_addch(sb, '\n'); | |
3d74982f RS |
100 | } |
101 | ||
102 | static unsigned int ustar_header_chksum(const struct ustar_header *header) | |
103 | { | |
104 | char *p = (char *)header; | |
105 | unsigned int chksum = 0; | |
106 | while (p < header->chksum) | |
107 | chksum += *p++; | |
108 | chksum += sizeof(header->chksum) * ' '; | |
109 | p += sizeof(header->chksum); | |
110 | while (p < (char *)header + sizeof(struct ustar_header)) | |
111 | chksum += *p++; | |
112 | return chksum; | |
113 | } | |
114 | ||
562e25ab | 115 | static size_t get_path_prefix(const char *path, size_t pathlen, size_t maxlen) |
3d74982f | 116 | { |
562e25ab | 117 | size_t i = pathlen; |
3d74982f RS |
118 | if (i > maxlen) |
119 | i = maxlen; | |
120 | do { | |
121 | i--; | |
562e25ab | 122 | } while (i > 0 && path[i] != '/'); |
3d74982f RS |
123 | return i; |
124 | } | |
125 | ||
562e25ab RS |
126 | static int write_tar_entry(struct archiver_args *args, |
127 | const unsigned char *sha1, const char *path, size_t pathlen, | |
128 | unsigned int mode, void *buffer, unsigned long size) | |
3d74982f RS |
129 | { |
130 | struct ustar_header header; | |
f285a2d7 | 131 | struct strbuf ext_header = STRBUF_INIT; |
562e25ab | 132 | int err = 0; |
3d74982f RS |
133 | |
134 | memset(&header, 0, sizeof(header)); | |
3d74982f RS |
135 | |
136 | if (!sha1) { | |
137 | *header.typeflag = TYPEFLAG_GLOBAL_HEADER; | |
138 | mode = 0100666; | |
139 | strcpy(header.name, "pax_global_header"); | |
140 | } else if (!path) { | |
141 | *header.typeflag = TYPEFLAG_EXT_HEADER; | |
142 | mode = 0100666; | |
143 | sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1)); | |
144 | } else { | |
302b9282 | 145 | if (S_ISDIR(mode) || S_ISGITLINK(mode)) { |
3d74982f RS |
146 | *header.typeflag = TYPEFLAG_DIR; |
147 | mode = (mode | 0777) & ~tar_umask; | |
148 | } else if (S_ISLNK(mode)) { | |
149 | *header.typeflag = TYPEFLAG_LNK; | |
150 | mode |= 0777; | |
151 | } else if (S_ISREG(mode)) { | |
152 | *header.typeflag = TYPEFLAG_REG; | |
153 | mode = (mode | ((mode & 0100) ? 0777 : 0666)) & ~tar_umask; | |
154 | } else { | |
562e25ab RS |
155 | return error("unsupported file mode: 0%o (SHA1: %s)", |
156 | mode, sha1_to_hex(sha1)); | |
3d74982f | 157 | } |
562e25ab RS |
158 | if (pathlen > sizeof(header.name)) { |
159 | size_t plen = get_path_prefix(path, pathlen, | |
160 | sizeof(header.prefix)); | |
161 | size_t rest = pathlen - plen - 1; | |
3d74982f | 162 | if (plen > 0 && rest <= sizeof(header.name)) { |
562e25ab RS |
163 | memcpy(header.prefix, path, plen); |
164 | memcpy(header.name, path + plen + 1, rest); | |
3d74982f RS |
165 | } else { |
166 | sprintf(header.name, "%s.data", | |
167 | sha1_to_hex(sha1)); | |
168 | strbuf_append_ext_header(&ext_header, "path", | |
562e25ab | 169 | path, pathlen); |
3d74982f RS |
170 | } |
171 | } else | |
562e25ab | 172 | memcpy(header.name, path, pathlen); |
3d74982f RS |
173 | } |
174 | ||
175 | if (S_ISLNK(mode) && buffer) { | |
176 | if (size > sizeof(header.linkname)) { | |
177 | sprintf(header.linkname, "see %s.paxheader", | |
178 | sha1_to_hex(sha1)); | |
179 | strbuf_append_ext_header(&ext_header, "linkpath", | |
180 | buffer, size); | |
181 | } else | |
182 | memcpy(header.linkname, buffer, size); | |
183 | } | |
184 | ||
185 | sprintf(header.mode, "%07o", mode & 07777); | |
186 | sprintf(header.size, "%011lo", S_ISREG(mode) ? size : 0); | |
3e1629f5 | 187 | sprintf(header.mtime, "%011lo", (unsigned long) args->time); |
3d74982f | 188 | |
3d74982f RS |
189 | sprintf(header.uid, "%07o", 0); |
190 | sprintf(header.gid, "%07o", 0); | |
f08b3b0e RS |
191 | strlcpy(header.uname, "root", sizeof(header.uname)); |
192 | strlcpy(header.gname, "root", sizeof(header.gname)); | |
3d74982f RS |
193 | sprintf(header.devmajor, "%07o", 0); |
194 | sprintf(header.devminor, "%07o", 0); | |
195 | ||
196 | memcpy(header.magic, "ustar", 6); | |
197 | memcpy(header.version, "00", 2); | |
198 | ||
199 | sprintf(header.chksum, "%07o", ustar_header_chksum(&header)); | |
200 | ||
201 | if (ext_header.len > 0) { | |
562e25ab RS |
202 | err = write_tar_entry(args, sha1, NULL, 0, 0, ext_header.buf, |
203 | ext_header.len); | |
204 | if (err) | |
205 | return err; | |
3d74982f | 206 | } |
7a604f16 | 207 | strbuf_release(&ext_header); |
3d74982f RS |
208 | write_blocked(&header, sizeof(header)); |
209 | if (S_ISREG(mode) && buffer && size > 0) | |
210 | write_blocked(buffer, size); | |
562e25ab | 211 | return err; |
3d74982f RS |
212 | } |
213 | ||
562e25ab | 214 | static int write_global_extended_header(struct archiver_args *args) |
3d74982f | 215 | { |
562e25ab | 216 | const unsigned char *sha1 = args->commit_sha1; |
f285a2d7 | 217 | struct strbuf ext_header = STRBUF_INIT; |
562e25ab | 218 | int err; |
7a604f16 | 219 | |
3d74982f | 220 | strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40); |
562e25ab RS |
221 | err = write_tar_entry(args, NULL, NULL, 0, 0, ext_header.buf, |
222 | ext_header.len); | |
7a604f16 | 223 | strbuf_release(&ext_header); |
562e25ab | 224 | return err; |
3d74982f RS |
225 | } |
226 | ||
767cf457 JK |
227 | static struct archiver **tar_filters; |
228 | static int nr_tar_filters; | |
229 | static int alloc_tar_filters; | |
230 | ||
231 | static struct archiver *find_tar_filter(const char *name, int len) | |
232 | { | |
233 | int i; | |
234 | for (i = 0; i < nr_tar_filters; i++) { | |
235 | struct archiver *ar = tar_filters[i]; | |
236 | if (!strncmp(ar->name, name, len) && !ar->name[len]) | |
237 | return ar; | |
238 | } | |
239 | return NULL; | |
240 | } | |
241 | ||
242 | static int tar_filter_config(const char *var, const char *value, void *data) | |
243 | { | |
244 | struct archiver *ar; | |
245 | const char *dot; | |
246 | const char *name; | |
247 | const char *type; | |
248 | int namelen; | |
249 | ||
250 | if (prefixcmp(var, "tar.")) | |
251 | return 0; | |
252 | dot = strrchr(var, '.'); | |
253 | if (dot == var + 9) | |
254 | return 0; | |
255 | ||
256 | name = var + 4; | |
257 | namelen = dot - name; | |
258 | type = dot + 1; | |
259 | ||
260 | ar = find_tar_filter(name, namelen); | |
261 | if (!ar) { | |
262 | ar = xcalloc(1, sizeof(*ar)); | |
263 | ar->name = xmemdupz(name, namelen); | |
264 | ar->write_archive = write_tar_filter_archive; | |
265 | ar->flags = ARCHIVER_WANT_COMPRESSION_LEVELS; | |
266 | ALLOC_GROW(tar_filters, nr_tar_filters + 1, alloc_tar_filters); | |
267 | tar_filters[nr_tar_filters++] = ar; | |
268 | } | |
269 | ||
270 | if (!strcmp(type, "command")) { | |
271 | if (!value) | |
272 | return config_error_nonbool(var); | |
273 | free(ar->data); | |
274 | ar->data = xstrdup(value); | |
275 | return 0; | |
276 | } | |
7b97730b JK |
277 | if (!strcmp(type, "remote")) { |
278 | if (git_config_bool(var, value)) | |
279 | ar->flags |= ARCHIVER_REMOTE; | |
280 | else | |
281 | ar->flags &= ~ARCHIVER_REMOTE; | |
282 | return 0; | |
283 | } | |
767cf457 JK |
284 | |
285 | return 0; | |
286 | } | |
287 | ||
ef90d6d4 | 288 | static int git_tar_config(const char *var, const char *value, void *cb) |
3d74982f RS |
289 | { |
290 | if (!strcmp(var, "tar.umask")) { | |
cc1816b0 | 291 | if (value && !strcmp(value, "user")) { |
3d74982f RS |
292 | tar_umask = umask(0); |
293 | umask(tar_umask); | |
294 | } else { | |
295 | tar_umask = git_config_int(var, value); | |
296 | } | |
297 | return 0; | |
298 | } | |
767cf457 JK |
299 | |
300 | return tar_filter_config(var, value, cb); | |
3d74982f RS |
301 | } |
302 | ||
4d7c9898 JK |
303 | static int write_tar_archive(const struct archiver *ar, |
304 | struct archiver_args *args) | |
3d74982f | 305 | { |
562e25ab | 306 | int err = 0; |
3d74982f | 307 | |
3d74982f | 308 | if (args->commit_sha1) |
562e25ab RS |
309 | err = write_global_extended_header(args); |
310 | if (!err) | |
311 | err = write_archive_entries(args, write_tar_entry); | |
312 | if (!err) | |
313 | write_trailer(); | |
314 | return err; | |
3d74982f | 315 | } |
13e0f88d | 316 | |
767cf457 JK |
317 | static int write_tar_filter_archive(const struct archiver *ar, |
318 | struct archiver_args *args) | |
319 | { | |
320 | struct strbuf cmd = STRBUF_INIT; | |
321 | struct child_process filter; | |
322 | const char *argv[2]; | |
323 | int r; | |
324 | ||
325 | if (!ar->data) | |
326 | die("BUG: tar-filter archiver called with no filter defined"); | |
327 | ||
328 | strbuf_addstr(&cmd, ar->data); | |
329 | if (args->compression_level >= 0) | |
330 | strbuf_addf(&cmd, " -%d", args->compression_level); | |
331 | ||
332 | memset(&filter, 0, sizeof(filter)); | |
333 | argv[0] = cmd.buf; | |
334 | argv[1] = NULL; | |
335 | filter.argv = argv; | |
336 | filter.use_shell = 1; | |
337 | filter.in = -1; | |
338 | ||
339 | if (start_command(&filter) < 0) | |
340 | die_errno("unable to start '%s' filter", argv[0]); | |
341 | close(1); | |
342 | if (dup2(filter.in, 1) < 0) | |
343 | die_errno("unable to redirect descriptor"); | |
344 | close(filter.in); | |
345 | ||
346 | r = write_tar_archive(ar, args); | |
347 | ||
348 | close(1); | |
349 | if (finish_command(&filter) != 0) | |
350 | die("'%s' filter reported error", argv[0]); | |
351 | ||
352 | strbuf_release(&cmd); | |
353 | return r; | |
354 | } | |
355 | ||
13e0f88d JK |
356 | static struct archiver tar_archiver = { |
357 | "tar", | |
358 | write_tar_archive, | |
7b97730b | 359 | ARCHIVER_REMOTE |
13e0f88d JK |
360 | }; |
361 | ||
362 | void init_tar_archiver(void) | |
363 | { | |
767cf457 | 364 | int i; |
13e0f88d | 365 | register_archiver(&tar_archiver); |
767cf457 | 366 | |
0e804e09 | 367 | tar_filter_config("tar.tgz.command", "gzip -cn", NULL); |
7b97730b | 368 | tar_filter_config("tar.tgz.remote", "true", NULL); |
0e804e09 | 369 | tar_filter_config("tar.tar.gz.command", "gzip -cn", NULL); |
7b97730b | 370 | tar_filter_config("tar.tar.gz.remote", "true", NULL); |
13e0f88d | 371 | git_config(git_tar_config, NULL); |
767cf457 JK |
372 | for (i = 0; i < nr_tar_filters; i++) { |
373 | /* omit any filters that never had a command configured */ | |
374 | if (tar_filters[i]->data) | |
375 | register_archiver(tar_filters[i]); | |
376 | } | |
13e0f88d | 377 | } |