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[git/dscho.git] / builtin-archive.c
blob14a1b3077cd7a5c4d69672bccfadc1354568dc4a
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"
15 static const char archive_usage[] = \
16 "git-archive --format=<fmt> [--prefix=<prefix>/] [--verbose] [<extra>] <tree-ish> [path...]";
18 static struct archiver_desc
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 },
28 static int run_remote_archiver(const char *remote, int argc,
29                                const char **argv)
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;
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         }
48         url = xstrdup(remote);
49         conn = git_connect(fd, url, exec, 0);
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]);
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         }
69         len = packet_read_line(fd[0], buf, sizeof(buf));
70         if (len)
71                 die("git-archive: expected a flush");
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);
79         return !!rv;
82 static void format_subst(const struct commit *commit,
83                          const char *src, size_t len,
84                          struct strbuf *buf)
86         char *to_free = NULL;
87         struct strbuf fmt;
89         if (src == buf->buf)
90                 to_free = strbuf_detach(buf, NULL);
91         strbuf_init(&fmt, 0);
92         for (;;) {
93                 const char *b, *c;
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;
102                 strbuf_reset(&fmt);
103                 strbuf_add(&fmt, b + 8, c - b - 8);
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);
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)
120         static struct git_attr *attr_export_subst;
121         struct git_attr_check check[1];
123         if (!commit)
124                 return 0;
126         if (!attr_export_subst)
127                 attr_export_subst = git_attr("export-subst", 12);
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;
135         format_subst(commit, src, len, buf);
136         return 1;
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)
144         void *buffer;
146         buffer = read_sha1_file(sha1, type, sizep);
147         if (buffer && S_ISREG(mode)) {
148                 struct strbuf buf;
149                 size_t size = 0;
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         }
159         return buffer;
162 static int init_archiver(const char *name, struct archiver *ar)
164         int rv = -1, i;
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;
179 void parse_pathspec_arg(const char **pathspec, struct archiver_args *ar_args)
181         ar_args->pathspec = get_pathspec(ar_args->base, pathspec);
184 void parse_treeish_arg(const char **argv, struct archiver_args *ar_args,
185                        const char *prefix)
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];
194         if (get_sha1(name, sha1))
195                 die("Not a valid object name");
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         }
206         tree = parse_tree_indirect(sha1);
207         if (tree == NULL)
208                 die("not a tree object");
210         if (prefix) {
211                 unsigned char tree_sha1[20];
212                 unsigned int mode;
213                 int err;
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");
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;
228 int parse_archive_args(int argc, const char **argv, struct archiver *ar)
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;
237         for (i = 1; i < argc; i++) {
238                 const char *arg = argv[i];
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         }
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);
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;
285         return i;
288 static const char *extract_remote_arg(int *ac, const char **av)
290         int ix, iy, cnt = *ac;
291         int no_more_options = 0;
292         const char *remote = NULL;
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;
319 int cmd_archive(int argc, const char **argv, const char *prefix)
321         struct archiver ar;
322         int tree_idx;
323         const char *remote = NULL;
325         remote = extract_remote_arg(&argc, argv);
326         if (remote)
327                 return run_remote_archiver(remote, argc, argv);
329         setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
331         memset(&ar, 0, sizeof(ar));
332         tree_idx = parse_archive_args(argc, argv, &ar);
333         if (prefix == NULL)
334                 prefix = setup_git_directory();
336         argv += tree_idx;
337         parse_treeish_arg(argv, &ar.args, prefix);
338         parse_pathspec_arg(argv + 1, &ar.args);
340         return ar.write_archive(&ar.args);