builtin-mailinfo.c: check error status from rewind and ftruncate
[git/spearce.git] / archive.c
blob73b8e8a56db460dbbd2fb32ae2f4bf297c93dc67
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;
35 if (src == buf->buf)
36 to_free = strbuf_detach(buf, NULL);
37 for (;;) {
38 const char *b, *c;
40 b = memmem(src, len, "$Format:", 8);
41 if (!b)
42 break;
43 c = memchr(b + 8, '$', (src + len) - b - 8);
44 if (!c)
45 break;
47 strbuf_reset(&fmt);
48 strbuf_add(&fmt, b + 8, c - b - 8);
50 strbuf_add(buf, src, b - src);
51 format_commit_message(commit, fmt.buf, buf, DATE_NORMAL);
52 len -= c + 1 - src;
53 src = c + 1;
55 strbuf_add(buf, src, len);
56 strbuf_release(&fmt);
57 free(to_free);
60 static void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
61 unsigned int mode, enum object_type *type,
62 unsigned long *sizep, const struct commit *commit)
64 void *buffer;
66 buffer = read_sha1_file(sha1, type, sizep);
67 if (buffer && S_ISREG(mode)) {
68 struct strbuf buf = STRBUF_INIT;
69 size_t size = 0;
71 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
72 convert_to_working_tree(path, buf.buf, buf.len, &buf);
73 if (commit)
74 format_subst(commit, buf.buf, buf.len, &buf);
75 buffer = strbuf_detach(&buf, &size);
76 *sizep = size;
79 return buffer;
82 static void setup_archive_check(struct git_attr_check *check)
84 static struct git_attr *attr_export_ignore;
85 static struct git_attr *attr_export_subst;
87 if (!attr_export_ignore) {
88 attr_export_ignore = git_attr("export-ignore", 13);
89 attr_export_subst = git_attr("export-subst", 12);
91 check[0].attr = attr_export_ignore;
92 check[1].attr = attr_export_subst;
95 struct archiver_context {
96 struct archiver_args *args;
97 write_archive_entry_fn_t write_entry;
100 static int write_archive_entry(const unsigned char *sha1, const char *base,
101 int baselen, const char *filename, unsigned mode, int stage,
102 void *context)
104 static struct strbuf path = STRBUF_INIT;
105 struct archiver_context *c = context;
106 struct archiver_args *args = c->args;
107 write_archive_entry_fn_t write_entry = c->write_entry;
108 struct git_attr_check check[2];
109 const char *path_without_prefix;
110 int convert = 0;
111 int err;
112 enum object_type type;
113 unsigned long size;
114 void *buffer;
116 strbuf_reset(&path);
117 strbuf_grow(&path, PATH_MAX);
118 strbuf_add(&path, base, baselen);
119 strbuf_addstr(&path, filename);
120 path_without_prefix = path.buf + args->baselen;
122 setup_archive_check(check);
123 if (!git_checkattr(path_without_prefix, ARRAY_SIZE(check), check)) {
124 if (ATTR_TRUE(check[0].value))
125 return 0;
126 convert = ATTR_TRUE(check[1].value);
129 if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
130 strbuf_addch(&path, '/');
131 if (args->verbose)
132 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
133 err = write_entry(args, sha1, path.buf, path.len, mode, NULL, 0);
134 if (err)
135 return err;
136 return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
139 buffer = sha1_file_to_archive(path_without_prefix, sha1, mode,
140 &type, &size, convert ? args->commit : NULL);
141 if (!buffer)
142 return error("cannot read %s", sha1_to_hex(sha1));
143 if (args->verbose)
144 fprintf(stderr, "%.*s\n", (int)path.len, path.buf);
145 err = write_entry(args, sha1, path.buf, path.len, mode, buffer, size);
146 free(buffer);
147 return err;
150 int write_archive_entries(struct archiver_args *args,
151 write_archive_entry_fn_t write_entry)
153 struct archiver_context context;
154 struct unpack_trees_options opts;
155 struct tree_desc t;
156 int err;
158 if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
159 size_t len = args->baselen;
161 while (len > 1 && args->base[len - 2] == '/')
162 len--;
163 if (args->verbose)
164 fprintf(stderr, "%.*s\n", (int)len, args->base);
165 err = write_entry(args, args->tree->object.sha1, args->base,
166 len, 040777, NULL, 0);
167 if (err)
168 return err;
171 context.args = args;
172 context.write_entry = write_entry;
175 * Setup index and instruct attr to read index only
177 if (!args->worktree_attributes) {
178 memset(&opts, 0, sizeof(opts));
179 opts.index_only = 1;
180 opts.head_idx = -1;
181 opts.src_index = &the_index;
182 opts.dst_index = &the_index;
183 opts.fn = oneway_merge;
184 init_tree_desc(&t, args->tree->buffer, args->tree->size);
185 if (unpack_trees(1, &t, &opts))
186 return -1;
187 git_attr_set_direction(GIT_ATTR_INDEX, &the_index);
190 err = read_tree_recursive(args->tree, args->base, args->baselen, 0,
191 args->pathspec, write_archive_entry, &context);
192 if (err == READ_TREE_RECURSIVE)
193 err = 0;
194 return err;
197 static const struct archiver *lookup_archiver(const char *name)
199 int i;
201 if (!name)
202 return NULL;
204 for (i = 0; i < ARRAY_SIZE(archivers); i++) {
205 if (!strcmp(name, archivers[i].name))
206 return &archivers[i];
208 return NULL;
211 static void parse_pathspec_arg(const char **pathspec,
212 struct archiver_args *ar_args)
214 ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
217 static void parse_treeish_arg(const char **argv,
218 struct archiver_args *ar_args, const char *prefix)
220 const char *name = argv[0];
221 const unsigned char *commit_sha1;
222 time_t archive_time;
223 struct tree *tree;
224 const struct commit *commit;
225 unsigned char sha1[20];
227 if (get_sha1(name, sha1))
228 die("Not a valid object name");
230 commit = lookup_commit_reference_gently(sha1, 1);
231 if (commit) {
232 commit_sha1 = commit->object.sha1;
233 archive_time = commit->date;
234 } else {
235 commit_sha1 = NULL;
236 archive_time = time(NULL);
239 tree = parse_tree_indirect(sha1);
240 if (tree == NULL)
241 die("not a tree object");
243 if (prefix) {
244 unsigned char tree_sha1[20];
245 unsigned int mode;
246 int err;
248 err = get_tree_entry(tree->object.sha1, prefix,
249 tree_sha1, &mode);
250 if (err || !S_ISDIR(mode))
251 die("current working directory is untracked");
253 tree = parse_tree_indirect(tree_sha1);
255 ar_args->tree = tree;
256 ar_args->commit_sha1 = commit_sha1;
257 ar_args->commit = commit;
258 ar_args->time = archive_time;
261 #define OPT__COMPR(s, v, h, p) \
262 { OPTION_SET_INT, (s), NULL, (v), NULL, (h), \
263 PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, (p) }
264 #define OPT__COMPR_HIDDEN(s, v, p) \
265 { OPTION_SET_INT, (s), NULL, (v), NULL, "", \
266 PARSE_OPT_NOARG | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN, NULL, (p) }
268 static int parse_archive_args(int argc, const char **argv,
269 const struct archiver **ar, struct archiver_args *args)
271 const char *format = "tar";
272 const char *base = NULL;
273 const char *remote = NULL;
274 const char *exec = NULL;
275 const char *output = NULL;
276 int compression_level = -1;
277 int verbose = 0;
278 int i;
279 int list = 0;
280 int worktree_attributes = 0;
281 struct option opts[] = {
282 OPT_GROUP(""),
283 OPT_STRING(0, "format", &format, "fmt", "archive format"),
284 OPT_STRING(0, "prefix", &base, "prefix",
285 "prepend prefix to each pathname in the archive"),
286 OPT_STRING('o', "output", &output, "file",
287 "write the archive to this file"),
288 OPT_BOOLEAN(0, "worktree-attributes", &worktree_attributes,
289 "read .gitattributes in working directory"),
290 OPT__VERBOSE(&verbose),
291 OPT__COMPR('0', &compression_level, "store only", 0),
292 OPT__COMPR('1', &compression_level, "compress faster", 1),
293 OPT__COMPR_HIDDEN('2', &compression_level, 2),
294 OPT__COMPR_HIDDEN('3', &compression_level, 3),
295 OPT__COMPR_HIDDEN('4', &compression_level, 4),
296 OPT__COMPR_HIDDEN('5', &compression_level, 5),
297 OPT__COMPR_HIDDEN('6', &compression_level, 6),
298 OPT__COMPR_HIDDEN('7', &compression_level, 7),
299 OPT__COMPR_HIDDEN('8', &compression_level, 8),
300 OPT__COMPR('9', &compression_level, "compress better", 9),
301 OPT_GROUP(""),
302 OPT_BOOLEAN('l', "list", &list,
303 "list supported archive formats"),
304 OPT_GROUP(""),
305 OPT_STRING(0, "remote", &remote, "repo",
306 "retrieve the archive from remote repository <repo>"),
307 OPT_STRING(0, "exec", &exec, "cmd",
308 "path to the remote git-upload-archive command"),
309 OPT_END()
312 argc = parse_options(argc, argv, NULL, opts, archive_usage, 0);
314 if (remote)
315 die("Unexpected option --remote");
316 if (exec)
317 die("Option --exec can only be used together with --remote");
318 if (output)
319 die("Unexpected option --output");
321 if (!base)
322 base = "";
324 if (list) {
325 for (i = 0; i < ARRAY_SIZE(archivers); i++)
326 printf("%s\n", archivers[i].name);
327 exit(0);
330 /* We need at least one parameter -- tree-ish */
331 if (argc < 1)
332 usage_with_options(archive_usage, opts);
333 *ar = lookup_archiver(format);
334 if (!*ar)
335 die("Unknown archive format '%s'", format);
337 args->compression_level = Z_DEFAULT_COMPRESSION;
338 if (compression_level != -1) {
339 if ((*ar)->flags & USES_ZLIB_COMPRESSION)
340 args->compression_level = compression_level;
341 else {
342 die("Argument not supported for format '%s': -%d",
343 format, compression_level);
346 args->verbose = verbose;
347 args->base = base;
348 args->baselen = strlen(base);
349 args->worktree_attributes = worktree_attributes;
351 return argc;
354 int write_archive(int argc, const char **argv, const char *prefix,
355 int setup_prefix)
357 const struct archiver *ar = NULL;
358 struct archiver_args args;
360 argc = parse_archive_args(argc, argv, &ar, &args);
361 if (setup_prefix && prefix == NULL)
362 prefix = setup_git_directory();
364 parse_treeish_arg(argv, &args, prefix);
365 parse_pathspec_arg(argv + 1, &args);
367 git_config(git_default_config, NULL);
369 return ar->write_archive(&args);