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1 | #include "cache.h" | |
2 | #include "commit.h" | |
3 | #include "tree-walk.h" | |
4 | #include "attr.h" | |
5 | #include "archive.h" | |
6 | #include "parse-options.h" | |
7 | #include "unpack-trees.h" | |
8 | ||
9 | static char const * const archive_usage[] = { | |
10 | "git archive [options] <tree-ish> [<path>...]", | |
11 | "git archive --list", | |
12 | "git archive --remote <repo> [--exec <cmd>] [options] <tree-ish> [<path>...]", | |
13 | "git archive --remote <repo> [--exec <cmd>] --list", | |
14 | NULL | |
15 | }; | |
16 | ||
17 | #define USES_ZLIB_COMPRESSION 1 | |
18 | ||
19 | static const struct archiver { | |
20 | const char *name; | |
21 | write_archive_fn_t write_archive; | |
22 | unsigned int flags; | |
23 | } archivers[] = { | |
24 | { "tar", write_tar_archive }, | |
25 | { "zip", write_zip_archive, USES_ZLIB_COMPRESSION }, | |
26 | }; | |
27 | ||
28 | static void format_subst(const struct commit *commit, | |
29 | const char *src, size_t len, | |
30 | struct strbuf *buf) | |
31 | { | |
32 | char *to_free = NULL; | |
33 | struct strbuf fmt = STRBUF_INIT; | |
34 | struct pretty_print_context ctx = {0}; | |
35 | ctx.date_mode = DATE_NORMAL; | |
36 | ctx.abbrev = DEFAULT_ABBREV; | |
37 | ||
38 | if (src == buf->buf) | |
39 | to_free = strbuf_detach(buf, NULL); | |
40 | for (;;) { | |
41 | const char *b, *c; | |
42 | ||
43 | b = memmem(src, len, "$Format:", 8); | |
44 | if (!b) | |
45 | break; | |
46 | c = memchr(b + 8, '$', (src + len) - b - 8); | |
47 | if (!c) | |
48 | break; | |
49 | ||
50 | strbuf_reset(&fmt); | |
51 | strbuf_add(&fmt, b + 8, c - b - 8); | |
52 | ||
53 | strbuf_add(buf, src, b - src); | |
54 | format_commit_message(commit, fmt.buf, buf, &ctx); | |
55 | len -= c + 1 - src; | |
56 | src = c + 1; | |
57 | } | |
58 | strbuf_add(buf, src, len); | |
59 | strbuf_release(&fmt); | |
60 | free(to_free); | |
61 | } | |
62 | ||
63 | static void *sha1_file_to_archive(const char *path, const unsigned char *sha1, | |
64 | unsigned int mode, enum object_type *type, | |
65 | unsigned long *sizep, const struct commit *commit) | |
66 | { | |
67 | void *buffer; | |
68 | ||
69 | buffer = read_sha1_file(sha1, type, sizep); | |
70 | if (buffer && S_ISREG(mode)) { | |
71 | struct strbuf buf = STRBUF_INIT; | |
72 | size_t size = 0; | |
73 | ||
74 | strbuf_attach(&buf, buffer, *sizep, *sizep + 1); | |
75 | convert_to_working_tree(path, buf.buf, buf.len, &buf); | |
76 | if (commit) | |
77 | format_subst(commit, buf.buf, buf.len, &buf); | |
78 | buffer = strbuf_detach(&buf, &size); | |
79 | *sizep = size; | |
80 | } | |
81 | ||
82 | return buffer; | |
83 | } | |
84 | ||
85 | static void setup_archive_check(struct git_attr_check *check) | |
86 | { | |
87 | static struct git_attr *attr_export_ignore; | |
88 | static struct git_attr *attr_export_subst; | |
89 | ||
90 | if (!attr_export_ignore) { | |
91 | attr_export_ignore = git_attr("export-ignore"); | |
92 | attr_export_subst = git_attr("export-subst"); | |
93 | } | |
94 | check[0].attr = attr_export_ignore; | |
95 | check[1].attr = attr_export_subst; | |
96 | } | |
97 | ||
98 | struct archiver_context { | |
99 | struct archiver_args *args; | |
100 | write_archive_entry_fn_t write_entry; | |
101 | }; | |
102 | ||
103 | static int write_archive_entry(const unsigned char *sha1, const char *base, | |
104 | int baselen, const char *filename, unsigned mode, int stage, | |
105 | void *context) | |
106 | { | |
107 | static struct strbuf path = STRBUF_INIT; | |
108 | struct archiver_context *c = context; | |
109 | struct archiver_args *args = c->args; | |
110 | write_archive_entry_fn_t write_entry = c->write_entry; | |
111 | struct git_attr_check check[2]; | |
112 | const char *path_without_prefix; | |
113 | int convert = 0; | |
114 | int err; | |
115 | enum object_type type; | |
116 | unsigned long size; | |
117 | void *buffer; | |
118 | ||
119 | strbuf_reset(&path); | |
120 | strbuf_grow(&path, PATH_MAX); | |
121 | strbuf_add(&path, args->base, args->baselen); | |
122 | strbuf_add(&path, base, baselen); | |
123 | strbuf_addstr(&path, filename); | |
124 | path_without_prefix = path.buf + args->baselen; | |
125 | ||
126 | setup_archive_check(check); | |
127 | if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) { | |
128 | if (ATTR_TRUE(check[0].value)) | |
129 | return 0; | |
130 | convert = ATTR_TRUE(check[1].value); | |
131 | } | |
132 | ||
133 | if (S_ISDIR(mode) || S_ISGITLINK(mode)) { | |
134 | strbuf_addch(&path, '/'); | |
135 | if (args->verbose) | |
136 | fprintf(stderr, "%.*s\n", (int)path.len, path.buf); | |
137 | err = write_entry(args, sha1, path.buf, path.len, mode, NULL, 0); | |
138 | if (err) | |
139 | return err; | |
140 | return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0); | |
141 | } | |
142 | ||
143 | buffer = sha1_file_to_archive(path_without_prefix, sha1, mode, | |
144 | &type, &size, convert ? args->commit : NULL); | |
145 | if (!buffer) | |
146 | return error("cannot read %s", sha1_to_hex(sha1)); | |
147 | if (args->verbose) | |
148 | fprintf(stderr, "%.*s\n", (int)path.len, path.buf); | |
149 | err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size); | |
150 | free(buffer); | |
151 | return err; | |
152 | } | |
153 | ||
154 | int write_archive_entries(struct archiver_args *args, | |
155 | write_archive_entry_fn_t write_entry) | |
156 | { | |
157 | struct archiver_context context; | |
158 | struct unpack_trees_options opts; | |
159 | struct tree_desc t; | |
160 | int err; | |
161 | ||
162 | if (args->baselen > 0 && args->base[args->baselen - 1] == '/') { | |
163 | size_t len = args->baselen; | |
164 | ||
165 | while (len > 1 && args->base[len - 2] == '/') | |
166 | len--; | |
167 | if (args->verbose) | |
168 | fprintf(stderr, "%.*s\n", (int)len, args->base); | |
169 | err = write_entry(args, args->tree->object.sha1, args->base, | |
170 | len, 040777, NULL, 0); | |
171 | if (err) | |
172 | return err; | |
173 | } | |
174 | ||
175 | context.args = args; | |
176 | context.write_entry = write_entry; | |
177 | ||
178 | /* | |
179 | * Setup index and instruct attr to read index only | |
180 | */ | |
181 | if (!args->worktree_attributes) { | |
182 | memset(&opts, 0, sizeof(opts)); | |
183 | opts.index_only = 1; | |
184 | opts.head_idx = -1; | |
185 | opts.src_index = &the_index; | |
186 | opts.dst_index = &the_index; | |
187 | opts.fn = oneway_merge; | |
188 | init_tree_desc(&t, args->tree->buffer, args->tree->size); | |
189 | if (unpack_trees(1, &t, &opts)) | |
190 | return -1; | |
191 | git_attr_set_direction(GIT_ATTR_INDEX, &the_index); | |
192 | } | |
193 | ||
194 | err = read_tree_recursive(args->tree, "", 0, 0, args->pathspec, | |
195 | write_archive_entry, &context); | |
196 | if (err == READ_TREE_RECURSIVE) | |
197 | err = 0; | |
198 | return err; | |
199 | } | |
200 | ||
201 | static const struct archiver *lookup_archiver(const char *name) | |
202 | { | |
203 | int i; | |
204 | ||
205 | if (!name) | |
206 | return NULL; | |
207 | ||
208 | for (i = 0; i < ARRAY_SIZE(archivers); i++) { | |
209 | if (!strcmp(name, archivers[i].name)) | |
210 | return &archivers[i]; | |
211 | } | |
212 | return NULL; | |
213 | } | |
214 | ||
215 | static int reject_entry(const unsigned char *sha1, const char *base, | |
216 | int baselen, const char *filename, unsigned mode, | |
217 | int stage, void *context) | |
218 | { | |
219 | return -1; | |
220 | } | |
221 | ||
222 | static int path_exists(struct tree *tree, const char *path) | |
223 | { | |
224 | const char *pathspec[] = { path, NULL }; | |
225 | ||
226 | if (read_tree_recursive(tree, "", 0, 0, pathspec, reject_entry, NULL)) | |
227 | return 1; | |
228 | return 0; | |
229 | } | |
230 | ||
231 | static void parse_pathspec_arg(const char **pathspec, | |
232 | struct archiver_args *ar_args) | |
233 | { | |
234 | ar_args->pathspec = pathspec = get_pathspec("", pathspec); | |
235 | if (pathspec) { | |
236 | while (*pathspec) { | |
237 | if (!path_exists(ar_args->tree, *pathspec)) | |
238 | die("path not found: %s", *pathspec); | |
239 | pathspec++; | |
240 | } | |
241 | } | |
242 | } | |
243 | ||
244 | static void parse_treeish_arg(const char **argv, | |
245 | struct archiver_args *ar_args, const char *prefix) | |
246 | { | |
247 | const char *name = argv[0]; | |
248 | const unsigned char *commit_sha1; | |
249 | time_t archive_time; | |
250 | struct tree *tree; | |
251 | const struct commit *commit; | |
252 | unsigned char sha1[20]; | |
253 | ||
254 | if (get_sha1(name, sha1)) | |
255 | die("Not a valid object name"); | |
256 | ||
257 | commit = lookup_commit_reference_gently(sha1, 1); | |
258 | if (commit) { | |
259 | commit_sha1 = commit->object.sha1; | |
260 | archive_time = commit->date; | |
261 | } else { | |
262 | commit_sha1 = NULL; | |
263 | archive_time = time(NULL); | |
264 | } | |
265 | ||
266 | tree = parse_tree_indirect(sha1); | |
267 | if (tree == NULL) | |
268 | die("not a tree object"); | |
269 | ||
270 | if (prefix) { | |
271 | unsigned char tree_sha1[20]; | |
272 | unsigned int mode; | |
273 | int err; | |
274 | ||
275 | err = get_tree_entry(tree->object.sha1, prefix, | |
276 | tree_sha1, &mode); | |
277 | if (err || !S_ISDIR(mode)) | |
278 | die("current working directory is untracked"); | |
279 | ||
280 | tree = parse_tree_indirect(tree_sha1); | |
281 | } | |
282 | ar_args->tree = tree; | |
283 | ar_args->commit_sha1 = commit_sha1; | |
284 | ar_args->commit = commit; | |
285 | ar_args->time = archive_time; | |
286 | } | |
287 | ||
288 | #define OPT__COMPR(s, v, h, p) \ | |
289 | { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \ | |
290 | PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) } | |
291 | #define OPT__COMPR_HIDDEN(s, v, p) \ | |
292 | { OPTION_SET_INT, (s), NULL, (v), NULL, "", \ | |
293 | PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) } | |
294 | ||
295 | static int parse_archive_args(int argc, const char **argv, | |
296 | const struct archiver **ar, struct archiver_args *args) | |
297 | { | |
298 | const char *format = "tar"; | |
299 | const char *base = NULL; | |
300 | const char *remote = NULL; | |
301 | const char *exec = NULL; | |
302 | const char *output = NULL; | |
303 | int compression_level = -1; | |
304 | int verbose = 0; | |
305 | int i; | |
306 | int list = 0; | |
307 | int worktree_attributes = 0; | |
308 | struct option opts[] = { | |
309 | OPT_GROUP(""), | |
310 | OPT_STRING(0, "format", &format, "fmt", "archive format"), | |
311 | OPT_STRING(0, "prefix", &base, "prefix", | |
312 | "prepend prefix to each pathname in the archive"), | |
313 | OPT_STRING('o', "output", &output, "file", | |
314 | "write the archive to this file"), | |
315 | OPT_BOOLEAN(0, "worktree-attributes", &worktree_attributes, | |
316 | "read .gitattributes in working directory"), | |
317 | OPT__VERBOSE(&verbose, "report archived files on stderr"), | |
318 | OPT__COMPR('0', &compression_level, "store only", 0), | |
319 | OPT__COMPR('1', &compression_level, "compress faster", 1), | |
320 | OPT__COMPR_HIDDEN('2', &compression_level, 2), | |
321 | OPT__COMPR_HIDDEN('3', &compression_level, 3), | |
322 | OPT__COMPR_HIDDEN('4', &compression_level, 4), | |
323 | OPT__COMPR_HIDDEN('5', &compression_level, 5), | |
324 | OPT__COMPR_HIDDEN('6', &compression_level, 6), | |
325 | OPT__COMPR_HIDDEN('7', &compression_level, 7), | |
326 | OPT__COMPR_HIDDEN('8', &compression_level, 8), | |
327 | OPT__COMPR('9', &compression_level, "compress better", 9), | |
328 | OPT_GROUP(""), | |
329 | OPT_BOOLEAN('l', "list", &list, | |
330 | "list supported archive formats"), | |
331 | OPT_GROUP(""), | |
332 | OPT_STRING(0, "remote", &remote, "repo", | |
333 | "retrieve the archive from remote repository <repo>"), | |
334 | OPT_STRING(0, "exec", &exec, "cmd", | |
335 | "path to the remote git-upload-archive command"), | |
336 | OPT_END() | |
337 | }; | |
338 | ||
339 | argc = parse_options(argc, argv, NULL, opts, archive_usage, 0); | |
340 | ||
341 | if (remote) | |
342 | die("Unexpected option --remote"); | |
343 | if (exec) | |
344 | die("Option --exec can only be used together with --remote"); | |
345 | if (output) | |
346 | die("Unexpected option --output"); | |
347 | ||
348 | if (!base) | |
349 | base = ""; | |
350 | ||
351 | if (list) { | |
352 | for (i = 0; i < ARRAY_SIZE(archivers); i++) | |
353 | printf("%s\n", archivers[i].name); | |
354 | exit(0); | |
355 | } | |
356 | ||
357 | /* We need at least one parameter -- tree-ish */ | |
358 | if (argc < 1) | |
359 | usage_with_options(archive_usage, opts); | |
360 | *ar = lookup_archiver(format); | |
361 | if (!*ar) | |
362 | die("Unknown archive format '%s'", format); | |
363 | ||
364 | args->compression_level = Z_DEFAULT_COMPRESSION; | |
365 | if (compression_level != -1) { | |
366 | if ((*ar)->flags & USES_ZLIB_COMPRESSION) | |
367 | args->compression_level = compression_level; | |
368 | else { | |
369 | die("Argument not supported for format '%s': -%d", | |
370 | format, compression_level); | |
371 | } | |
372 | } | |
373 | args->verbose = verbose; | |
374 | args->base = base; | |
375 | args->baselen = strlen(base); | |
376 | args->worktree_attributes = worktree_attributes; | |
377 | ||
378 | return argc; | |
379 | } | |
380 | ||
381 | int write_archive(int argc, const char **argv, const char *prefix, | |
382 | int setup_prefix) | |
383 | { | |
384 | const struct archiver *ar = NULL; | |
385 | struct archiver_args args; | |
386 | ||
387 | argc = parse_archive_args(argc, argv, &ar, &args); | |
388 | if (setup_prefix && prefix == NULL) | |
389 | prefix = setup_git_directory(); | |
390 | ||
391 | parse_treeish_arg(argv, &args, prefix); | |
392 | parse_pathspec_arg(argv + 1, &args); | |
393 | ||
394 | git_config(git_default_config, NULL); | |
395 | ||
396 | return ar->write_archive(&args); | |
397 | } |