Merge branch 'maint'
[git/git.git] / builtin-archive.c
1 /*
2 * Copyright (c) 2006 Franck Bui-Huu
3 * Copyright (c) 2006 Rene Scharfe
4 */
5 #include "cache.h"
6 #include "builtin.h"
7 #include "archive.h"
8 #include "commit.h"
9 #include "tree-walk.h"
10 #include "exec_cmd.h"
11 #include "pkt-line.h"
12 #include "sideband.h"
13 #include "attr.h"
14
15 static const char archive_usage[] = \
16 "git-archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";
17
18 static struct archiver_desc
19 {
20 const char *name;
21 write_archive_fn_t write_archive;
22 parse_extra_args_fn_t parse_extra;
23 } archivers[] = {
24 { "tar", write_tar_archive, NULL },
25 { "zip", write_zip_archive, parse_extra_zip_args },
26 };
27
28 static int run_remote_archiver(const char *remote, int argc,
29 const char **argv)
30 {
31 char *url, buf[LARGE_PACKET_MAX];
32 int fd[2], i, len, rv;
33 struct child_process *conn;
34 const char *exec = "git-upload-archive";
35 int exec_at = 0;
36
37 for (i = 1; i < argc; i++) {
38 const char *arg = argv[i];
39 if (!prefixcmp(arg, "--exec=")) {
40 if (exec_at)
41 die("multiple --exec specified");
42 exec = arg + 7;
43 exec_at = i;
44 break;
45 }
46 }
47
48 url = xstrdup(remote);
49 conn = git_connect(fd, url, exec, 0);
50
51 for (i = 1; i < argc; i++) {
52 if (i == exec_at)
53 continue;
54 packet_write(fd[1], "argument %s\n", argv[i]);
55 }
56 packet_flush(fd[1]);
57
58 len = packet_read_line(fd[0], buf, sizeof(buf));
59 if (!len)
60 die("git-archive: expected ACK/NAK, got EOF");
61 if (buf[len-1] == '\n')
62 buf[--len] = 0;
63 if (strcmp(buf, "ACK")) {
64 if (len > 5 && !prefixcmp(buf, "NACK "))
65 die("git-archive: NACK %s", buf + 5);
66 die("git-archive: protocol error");
67 }
68
69 len = packet_read_line(fd[0], buf, sizeof(buf));
70 if (len)
71 die("git-archive: expected a flush");
72
73 /* Now, start reading from fd[0] and spit it out to stdout */
74 rv = recv_sideband("archive", fd[0], 1, 2);
75 close(fd[0]);
76 close(fd[1]);
77 rv |= finish_connect(conn);
78
79 return !!rv;
80 }
81
82 static void format_subst(const struct commit *commit,
83 const char *src, size_t len,
84 struct strbuf *buf)
85 {
86 char *to_free = NULL;
87 struct strbuf fmt;
88
89 if (src == buf->buf)
90 to_free = strbuf_detach(buf, NULL);
91 strbuf_init(&fmt, 0);
92 for (;;) {
93 const char *b, *c;
94
95 b = memmem(src, len, "$Format:", 8);
96 if (!b || src + len < b + 9)
97 break;
98 c = memchr(b + 8, '$', len - 8);
99 if (!c)
100 break;
101
102 strbuf_reset(&fmt);
103 strbuf_add(&fmt, b + 8, c - b - 8);
104
105 strbuf_add(buf, src, b - src);
106 format_commit_message(commit, fmt.buf, buf);
107 len -= c + 1 - src;
108 src = c + 1;
109 }
110 strbuf_add(buf, src, len);
111 strbuf_release(&fmt);
112 free(to_free);
113 }
114
115 static int convert_to_archive(const char *path,
116 const void *src, size_t len,
117 struct strbuf *buf,
118 const struct commit *commit)
119 {
120 static struct git_attr *attr_export_subst;
121 struct git_attr_check check[1];
122
123 if (!commit)
124 return 0;
125
126 if (!attr_export_subst)
127 attr_export_subst = git_attr("export-subst", 12);
128
129 check[0].attr = attr_export_subst;
130 if (git_checkattr(path, ARRAY_SIZE(check), check))
131 return 0;
132 if (!ATTR_TRUE(check[0].value))
133 return 0;
134
135 format_subst(commit, src, len, buf);
136 return 1;
137 }
138
139 void *sha1_file_to_archive(const char *path, const unsigned char *sha1,
140 unsigned int mode, enum object_type *type,
141 unsigned long *sizep,
142 const struct commit *commit)
143 {
144 void *buffer;
145
146 buffer = read_sha1_file(sha1, type, sizep);
147 if (buffer && S_ISREG(mode)) {
148 struct strbuf buf;
149 size_t size = 0;
150
151 strbuf_init(&buf, 0);
152 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
153 convert_to_working_tree(path, buf.buf, buf.len, &buf);
154 convert_to_archive(path, buf.buf, buf.len, &buf, commit);
155 buffer = strbuf_detach(&buf, &size);
156 *sizep = size;
157 }
158
159 return buffer;
160 }
161
162 static int init_archiver(const char *name, struct archiver *ar)
163 {
164 int rv = -1, i;
165
166 for (i = 0; i < ARRAY_SIZE(archivers); i++) {
167 if (!strcmp(name, archivers[i].name)) {
168 memset(ar, 0, sizeof(*ar));
169 ar->name = archivers[i].name;
170 ar->write_archive = archivers[i].write_archive;
171 ar->parse_extra = archivers[i].parse_extra;
172 rv = 0;
173 break;
174 }
175 }
176 return rv;
177 }
178
179 void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
180 {
181 ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
182 }
183
184 void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
185 const char *prefix)
186 {
187 const char *name = argv[0];
188 const unsigned char *commit_sha1;
189 time_t archive_time;
190 struct tree *tree;
191 const struct commit *commit;
192 unsigned char sha1[20];
193
194 if (get_sha1(name, sha1))
195 die("Not a valid object name");
196
197 commit = lookup_commit_reference_gently(sha1, 1);
198 if (commit) {
199 commit_sha1 = commit->object.sha1;
200 archive_time = commit->date;
201 } else {
202 commit_sha1 = NULL;
203 archive_time = time(NULL);
204 }
205
206 tree = parse_tree_indirect(sha1);
207 if (tree == NULL)
208 die("not a tree object");
209
210 if (prefix) {
211 unsigned char tree_sha1[20];
212 unsigned int mode;
213 int err;
214
215 err = get_tree_entry(tree->object.sha1, prefix,
216 tree_sha1, &mode);
217 if (err || !S_ISDIR(mode))
218 die("current working directory is untracked");
219
220 tree = parse_tree_indirect(tree_sha1);
221 }
222 ar_args->tree = tree;
223 ar_args->commit_sha1 = commit_sha1;
224 ar_args->commit = commit;
225 ar_args->time = archive_time;
226 }
227
228 int parse_archive_args(int argc, const char **argv, struct archiver *ar)
229 {
230 const char *extra_argv[MAX_EXTRA_ARGS];
231 int extra_argc = 0;
232 const char *format = "tar";
233 const char *base = "";
234 int verbose = 0;
235 int i;
236
237 for (i = 1; i < argc; i++) {
238 const char *arg = argv[i];
239
240 if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
241 for (i = 0; i < ARRAY_SIZE(archivers); i++)
242 printf("%s\n", archivers[i].name);
243 exit(0);
244 }
245 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
246 verbose = 1;
247 continue;
248 }
249 if (!prefixcmp(arg, "--format=")) {
250 format = arg + 9;
251 continue;
252 }
253 if (!prefixcmp(arg, "--prefix=")) {
254 base = arg + 9;
255 continue;
256 }
257 if (!strcmp(arg, "--")) {
258 i++;
259 break;
260 }
261 if (arg[0] == '-') {
262 if (extra_argc > MAX_EXTRA_ARGS - 1)
263 die("Too many extra options");
264 extra_argv[extra_argc++] = arg;
265 continue;
266 }
267 break;
268 }
269
270 /* We need at least one parameter -- tree-ish */
271 if (argc - 1 < i)
272 usage(archive_usage);
273 if (init_archiver(format, ar) < 0)
274 die("Unknown archive format '%s'", format);
275
276 if (extra_argc) {
277 if (!ar->parse_extra)
278 die("'%s' format does not handle %s",
279 ar->name, extra_argv[0]);
280 ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
281 }
282 ar->args.verbose = verbose;
283 ar->args.base = base;
284
285 return i;
286 }
287
288 static const char *extract_remote_arg(int *ac, const char **av)
289 {
290 int ix, iy, cnt = *ac;
291 int no_more_options = 0;
292 const char *remote = NULL;
293
294 for (ix = iy = 1; ix < cnt; ix++) {
295 const char *arg = av[ix];
296 if (!strcmp(arg, "--"))
297 no_more_options = 1;
298 if (!no_more_options) {
299 if (!prefixcmp(arg, "--remote=")) {
300 if (remote)
301 die("Multiple --remote specified");
302 remote = arg + 9;
303 continue;
304 }
305 if (arg[0] != '-')
306 no_more_options = 1;
307 }
308 if (ix != iy)
309 av[iy] = arg;
310 iy++;
311 }
312 if (remote) {
313 av[--cnt] = NULL;
314 *ac = cnt;
315 }
316 return remote;
317 }
318
319 int cmd_archive(int argc, const char **argv, const char *prefix)
320 {
321 struct archiver ar;
322 int tree_idx;
323 const char *remote = NULL;
324
325 remote = extract_remote_arg(&argc, argv);
326 if (remote)
327 return run_remote_archiver(remote, argc, argv);
328
329 setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
330
331 memset(&ar, 0, sizeof(ar));
332 tree_idx = parse_archive_args(argc, argv, &ar);
333 if (prefix == NULL)
334 prefix = setup_git_directory();
335
336 argv += tree_idx;
337 parse_treeish_arg(argv, &ar.args, prefix);
338 parse_pathspec_arg(argv + 1, &ar.args);
339
340 return ar.write_archive(&ar.args);
341 }