blame.c: Properly initialize strbuf after calling, textconv_object()
[git/dscho.git] / archive.c
blobedd68534fa847ad839fe8554e6864b39de4fcde0
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"
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
17 #define USES_ZLIB_COMPRESSION 1
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 },
28 static void format_subst(const struct commit *commit,
29 const char *src, size_t len,
30 struct strbuf *buf)
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;
38 if (src == buf->buf)
39 to_free = strbuf_detach(buf, NULL);
40 for (;;) {
41 const char *b, *c;
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;
50 strbuf_reset(&fmt);
51 strbuf_add(&fmt, b + 8, c - b - 8);
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;
58 strbuf_add(buf, src, len);
59 strbuf_release(&fmt);
60 free(to_free);
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)
67 void *buffer;
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;
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;
82 return buffer;
85 static void setup_archive_check(struct git_attr_check *check)
87 static struct git_attr *attr_export_ignore;
88 static struct git_attr *attr_export_subst;
90 if (!attr_export_ignore) {
91 attr_export_ignore = git_attr("export-ignore");
92 attr_export_subst = git_attr("export-subst");
94 check[0].attr = attr_export_ignore;
95 check[1].attr = attr_export_subst;
98 struct archiver_context {
99 struct archiver_args *args;
100 write_archive_entry_fn_t write_entry;
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)
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;
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;
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);
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);
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;
154 int write_archive_entries(struct archiver_args *args,
155 write_archive_entry_fn_t write_entry)
157 struct archiver_context context;
158 struct unpack_trees_options opts;
159 struct tree_desc t;
160 int err;
162 if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
163 size_t len = args->baselen;
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;
175 context.args = args;
176 context.write_entry = write_entry;
179 * Setup index and instruct attr to read index only
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);
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;
201 static const struct archiver *lookup_archiver(const char *name)
203 int i;
205 if (!name)
206 return NULL;
208 for (i = 0; i < ARRAY_SIZE(archivers); i++) {
209 if (!strcmp(name, archivers[i].name))
210 return &archivers[i];
212 return NULL;
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)
219 return -1;
222 static int path_exists(struct tree *tree, const char *path)
224 const char *pathspec[] = { path, NULL };
226 if (read_tree_recursive(tree, "", 0, 0, pathspec, reject_entry, NULL))
227 return 1;
228 return 0;
231 static void parse_pathspec_arg(const char **pathspec,
232 struct archiver_args *ar_args)
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++;
244 static void parse_treeish_arg(const char **argv,
245 struct archiver_args *ar_args, const char *prefix)
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];
254 if (get_sha1(name, sha1))
255 die("Not a valid object name");
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);
266 tree = parse_tree_indirect(sha1);
267 if (tree == NULL)
268 die("not a tree object");
270 if (prefix) {
271 unsigned char tree_sha1[20];
272 unsigned int mode;
273 int err;
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");
280 tree = parse_tree_indirect(tree_sha1);
282 ar_args->tree = tree;
283 ar_args->commit_sha1 = commit_sha1;
284 ar_args->commit = commit;
285 ar_args->time = archive_time;
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) }
295 static int parse_archive_args(int argc, const char **argv,
296 const struct archiver **ar, struct archiver_args *args)
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),
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()
339 argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
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");
348 if (!base)
349 base = "";
351 if (list) {
352 for (i = 0; i < ARRAY_SIZE(archivers); i++)
353 printf("%s\n", archivers[i].name);
354 exit(0);
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);
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);
373 args->verbose = verbose;
374 args->base = base;
375 args->baselen = strlen(base);
376 args->worktree_attributes = worktree_attributes;
378 return argc;
381 int write_archive(int argc, const char **argv, const char *prefix,
382 int setup_prefix)
384 const struct archiver *ar = NULL;
385 struct archiver_args args;
387 argc = parse_archive_args(argc, argv, &ar, &args);
388 if (setup_prefix && prefix == NULL)
389 prefix = setup_git_directory();
391 parse_treeish_arg(argv, &args, prefix);
392 parse_pathspec_arg(argv + 1, &args);
394 git_config(git_default_config, NULL);
396 return ar->write_archive(&args);