Change git_connect() to return a struct child_process instead of a pid_t.
[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
150 strbuf_init(&buf, 0);
151 strbuf_attach(&buf, buffer, *sizep, *sizep + 1);
152 convert_to_working_tree(path, buf.buf, buf.len, &buf);
153 convert_to_archive(path, buf.buf, buf.len, &buf, commit);
154 buffer = strbuf_detach(&buf, sizep);
155 }
156
157 return buffer;
158 }
159
160 static int init_archiver(const char *name, struct archiver *ar)
161 {
162 int rv = -1, i;
163
164 for (i = 0; i < ARRAY_SIZE(archivers); i++) {
165 if (!strcmp(name, archivers[i].name)) {
166 memset(ar, 0, sizeof(*ar));
167 ar->name = archivers[i].name;
168 ar->write_archive = archivers[i].write_archive;
169 ar->parse_extra = archivers[i].parse_extra;
170 rv = 0;
171 break;
172 }
173 }
174 return rv;
175 }
176
177 void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
178 {
179 ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
180 }
181
182 void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
183 const char *prefix)
184 {
185 const char *name = argv[0];
186 const unsigned char *commit_sha1;
187 time_t archive_time;
188 struct tree *tree;
189 const struct commit *commit;
190 unsigned char sha1[20];
191
192 if (get_sha1(name, sha1))
193 die("Not a valid object name");
194
195 commit = lookup_commit_reference_gently(sha1, 1);
196 if (commit) {
197 commit_sha1 = commit->object.sha1;
198 archive_time = commit->date;
199 } else {
200 commit_sha1 = NULL;
201 archive_time = time(NULL);
202 }
203
204 tree = parse_tree_indirect(sha1);
205 if (tree == NULL)
206 die("not a tree object");
207
208 if (prefix) {
209 unsigned char tree_sha1[20];
210 unsigned int mode;
211 int err;
212
213 err = get_tree_entry(tree->object.sha1, prefix,
214 tree_sha1, &mode);
215 if (err || !S_ISDIR(mode))
216 die("current working directory is untracked");
217
218 tree = parse_tree_indirect(tree_sha1);
219 }
220 ar_args->tree = tree;
221 ar_args->commit_sha1 = commit_sha1;
222 ar_args->commit = commit;
223 ar_args->time = archive_time;
224 }
225
226 int parse_archive_args(int argc, const char **argv, struct archiver *ar)
227 {
228 const char *extra_argv[MAX_EXTRA_ARGS];
229 int extra_argc = 0;
230 const char *format = "tar";
231 const char *base = "";
232 int verbose = 0;
233 int i;
234
235 for (i = 1; i < argc; i++) {
236 const char *arg = argv[i];
237
238 if (!strcmp(arg, "--list") || !strcmp(arg, "-l")) {
239 for (i = 0; i < ARRAY_SIZE(archivers); i++)
240 printf("%s\n", archivers[i].name);
241 exit(0);
242 }
243 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
244 verbose = 1;
245 continue;
246 }
247 if (!prefixcmp(arg, "--format=")) {
248 format = arg + 9;
249 continue;
250 }
251 if (!prefixcmp(arg, "--prefix=")) {
252 base = arg + 9;
253 continue;
254 }
255 if (!strcmp(arg, "--")) {
256 i++;
257 break;
258 }
259 if (arg[0] == '-') {
260 if (extra_argc > MAX_EXTRA_ARGS - 1)
261 die("Too many extra options");
262 extra_argv[extra_argc++] = arg;
263 continue;
264 }
265 break;
266 }
267
268 /* We need at least one parameter -- tree-ish */
269 if (argc - 1 < i)
270 usage(archive_usage);
271 if (init_archiver(format, ar) < 0)
272 die("Unknown archive format '%s'", format);
273
274 if (extra_argc) {
275 if (!ar->parse_extra)
276 die("'%s' format does not handle %s",
277 ar->name, extra_argv[0]);
278 ar->args.extra = ar->parse_extra(extra_argc, extra_argv);
279 }
280 ar->args.verbose = verbose;
281 ar->args.base = base;
282
283 return i;
284 }
285
286 static const char *extract_remote_arg(int *ac, const char **av)
287 {
288 int ix, iy, cnt = *ac;
289 int no_more_options = 0;
290 const char *remote = NULL;
291
292 for (ix = iy = 1; ix < cnt; ix++) {
293 const char *arg = av[ix];
294 if (!strcmp(arg, "--"))
295 no_more_options = 1;
296 if (!no_more_options) {
297 if (!prefixcmp(arg, "--remote=")) {
298 if (remote)
299 die("Multiple --remote specified");
300 remote = arg + 9;
301 continue;
302 }
303 if (arg[0] != '-')
304 no_more_options = 1;
305 }
306 if (ix != iy)
307 av[iy] = arg;
308 iy++;
309 }
310 if (remote) {
311 av[--cnt] = NULL;
312 *ac = cnt;
313 }
314 return remote;
315 }
316
317 int cmd_archive(int argc, const char **argv, const char *prefix)
318 {
319 struct archiver ar;
320 int tree_idx;
321 const char *remote = NULL;
322
323 remote = extract_remote_arg(&argc, argv);
324 if (remote)
325 return run_remote_archiver(remote, argc, argv);
326
327 setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
328
329 memset(&ar, 0, sizeof(ar));
330 tree_idx = parse_archive_args(argc, argv, &ar);
331 if (prefix == NULL)
332 prefix = setup_git_directory();
333
334 argv += tree_idx;
335 parse_treeish_arg(argv, &ar.args, prefix);
336 parse_pathspec_arg(argv + 1, &ar.args);
337
338 return ar.write_archive(&ar.args);
339 }