Make fetch-pack a builtin with an internal API
[git/git.git] / git.c
1 #include "builtin.h"
2 #include "exec_cmd.h"
3 #include "cache.h"
4 #include "quote.h"
5
6 const char git_usage_string[] =
7 "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
8
9 static void prepend_to_path(const char *dir, int len)
10 {
11 const char *old_path = getenv("PATH");
12 char *path;
13 int path_len = len;
14
15 if (!old_path)
16 old_path = "/usr/local/bin:/usr/bin:/bin";
17
18 path_len = len + strlen(old_path) + 1;
19
20 path = xmalloc(path_len + 1);
21
22 memcpy(path, dir, len);
23 path[len] = ':';
24 memcpy(path + len + 1, old_path, path_len - len);
25
26 setenv("PATH", path, 1);
27
28 free(path);
29 }
30
31 static int handle_options(const char*** argv, int* argc, int* envchanged)
32 {
33 int handled = 0;
34
35 while (*argc > 0) {
36 const char *cmd = (*argv)[0];
37 if (cmd[0] != '-')
38 break;
39
40 /*
41 * For legacy reasons, the "version" and "help"
42 * commands can be written with "--" prepended
43 * to make them look like flags.
44 */
45 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
46 break;
47
48 /*
49 * Check remaining flags.
50 */
51 if (!prefixcmp(cmd, "--exec-path")) {
52 cmd += 11;
53 if (*cmd == '=')
54 git_set_exec_path(cmd + 1);
55 else {
56 puts(git_exec_path());
57 exit(0);
58 }
59 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
60 setup_pager();
61 } else if (!strcmp(cmd, "--no-pager")) {
62 setenv("GIT_PAGER", "cat", 1);
63 if (envchanged)
64 *envchanged = 1;
65 } else if (!strcmp(cmd, "--git-dir")) {
66 if (*argc < 2) {
67 fprintf(stderr, "No directory given for --git-dir.\n" );
68 usage(git_usage_string);
69 }
70 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
71 if (envchanged)
72 *envchanged = 1;
73 (*argv)++;
74 (*argc)--;
75 handled++;
76 } else if (!prefixcmp(cmd, "--git-dir=")) {
77 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
78 if (envchanged)
79 *envchanged = 1;
80 } else if (!strcmp(cmd, "--work-tree")) {
81 if (*argc < 2) {
82 fprintf(stderr, "No directory given for --work-tree.\n" );
83 usage(git_usage_string);
84 }
85 setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
86 if (envchanged)
87 *envchanged = 1;
88 (*argv)++;
89 (*argc)--;
90 } else if (!prefixcmp(cmd, "--work-tree=")) {
91 setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
92 if (envchanged)
93 *envchanged = 1;
94 } else if (!strcmp(cmd, "--bare")) {
95 static char git_dir[PATH_MAX+1];
96 is_bare_repository_cfg = 1;
97 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
98 if (envchanged)
99 *envchanged = 1;
100 } else {
101 fprintf(stderr, "Unknown option: %s\n", cmd);
102 usage(git_usage_string);
103 }
104
105 (*argv)++;
106 (*argc)--;
107 handled++;
108 }
109 return handled;
110 }
111
112 static const char *alias_command;
113 static char *alias_string;
114
115 static int git_alias_config(const char *var, const char *value)
116 {
117 if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
118 alias_string = xstrdup(value);
119 }
120 return 0;
121 }
122
123 static int split_cmdline(char *cmdline, const char ***argv)
124 {
125 int src, dst, count = 0, size = 16;
126 char quoted = 0;
127
128 *argv = xmalloc(sizeof(char*) * size);
129
130 /* split alias_string */
131 (*argv)[count++] = cmdline;
132 for (src = dst = 0; cmdline[src];) {
133 char c = cmdline[src];
134 if (!quoted && isspace(c)) {
135 cmdline[dst++] = 0;
136 while (cmdline[++src]
137 && isspace(cmdline[src]))
138 ; /* skip */
139 if (count >= size) {
140 size += 16;
141 *argv = xrealloc(*argv, sizeof(char*) * size);
142 }
143 (*argv)[count++] = cmdline + dst;
144 } else if(!quoted && (c == '\'' || c == '"')) {
145 quoted = c;
146 src++;
147 } else if (c == quoted) {
148 quoted = 0;
149 src++;
150 } else {
151 if (c == '\\' && quoted != '\'') {
152 src++;
153 c = cmdline[src];
154 if (!c) {
155 free(*argv);
156 *argv = NULL;
157 return error("cmdline ends with \\");
158 }
159 }
160 cmdline[dst++] = c;
161 src++;
162 }
163 }
164
165 cmdline[dst] = 0;
166
167 if (quoted) {
168 free(*argv);
169 *argv = NULL;
170 return error("unclosed quote");
171 }
172
173 return count;
174 }
175
176 static int handle_alias(int *argcp, const char ***argv)
177 {
178 int nongit = 0, envchanged = 0, ret = 0, saved_errno = errno;
179 const char *subdir;
180 int count, option_count;
181 const char** new_argv;
182
183 subdir = setup_git_directory_gently(&nongit);
184
185 alias_command = (*argv)[0];
186 git_config(git_alias_config);
187 if (alias_string) {
188 if (alias_string[0] == '!') {
189 if (*argcp > 1) {
190 int i, sz = PATH_MAX;
191 char *s = xmalloc(sz), *new_alias = s;
192
193 add_to_string(&s, &sz, alias_string, 0);
194 free(alias_string);
195 alias_string = new_alias;
196 for (i = 1; i < *argcp &&
197 !add_to_string(&s, &sz, " ", 0) &&
198 !add_to_string(&s, &sz, (*argv)[i], 1)
199 ; i++)
200 ; /* do nothing */
201 if (!sz)
202 die("Too many or long arguments");
203 }
204 trace_printf("trace: alias to shell cmd: %s => %s\n",
205 alias_command, alias_string + 1);
206 ret = system(alias_string + 1);
207 if (ret >= 0 && WIFEXITED(ret) &&
208 WEXITSTATUS(ret) != 127)
209 exit(WEXITSTATUS(ret));
210 die("Failed to run '%s' when expanding alias '%s'\n",
211 alias_string + 1, alias_command);
212 }
213 count = split_cmdline(alias_string, &new_argv);
214 option_count = handle_options(&new_argv, &count, &envchanged);
215 if (envchanged)
216 die("alias '%s' changes environment variables\n"
217 "You can use '!git' in the alias to do this.",
218 alias_command);
219 memmove(new_argv - option_count, new_argv,
220 count * sizeof(char *));
221 new_argv -= option_count;
222
223 if (count < 1)
224 die("empty alias for %s", alias_command);
225
226 if (!strcmp(alias_command, new_argv[0]))
227 die("recursive alias: %s", alias_command);
228
229 trace_argv_printf(new_argv, count,
230 "trace: alias expansion: %s =>",
231 alias_command);
232
233 new_argv = xrealloc(new_argv, sizeof(char*) *
234 (count + *argcp + 1));
235 /* insert after command name */
236 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
237 new_argv[count+*argcp] = NULL;
238
239 *argv = new_argv;
240 *argcp += count - 1;
241
242 ret = 1;
243 }
244
245 if (subdir)
246 chdir(subdir);
247
248 errno = saved_errno;
249
250 return ret;
251 }
252
253 const char git_version_string[] = GIT_VERSION;
254
255 #define RUN_SETUP (1<<0)
256 #define USE_PAGER (1<<1)
257 /*
258 * require working tree to be present -- anything uses this needs
259 * RUN_SETUP for reading from the configuration file.
260 */
261 #define NEED_WORK_TREE (1<<2)
262
263 struct cmd_struct {
264 const char *cmd;
265 int (*fn)(int, const char **, const char *);
266 int option;
267 };
268
269 static int run_command(struct cmd_struct *p, int argc, const char **argv)
270 {
271 int status;
272 struct stat st;
273 const char *prefix;
274
275 prefix = NULL;
276 if (p->option & RUN_SETUP)
277 prefix = setup_git_directory();
278 if (p->option & USE_PAGER)
279 setup_pager();
280 if (p->option & NEED_WORK_TREE) {
281 const char *work_tree = get_git_work_tree();
282 const char *git_dir = get_git_dir();
283 if (!is_absolute_path(git_dir))
284 set_git_dir(make_absolute_path(git_dir));
285 if (!work_tree || chdir(work_tree))
286 die("%s must be run in a work tree", p->cmd);
287 }
288 trace_argv_printf(argv, argc, "trace: built-in: git");
289
290 status = p->fn(argc, argv, prefix);
291 if (status)
292 return status;
293
294 /* Somebody closed stdout? */
295 if (fstat(fileno(stdout), &st))
296 return 0;
297 /* Ignore write errors for pipes and sockets.. */
298 if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
299 return 0;
300
301 /* Check for ENOSPC and EIO errors.. */
302 if (fflush(stdout))
303 die("write failure on standard output: %s", strerror(errno));
304 if (ferror(stdout))
305 die("unknown write failure on standard output");
306 if (fclose(stdout))
307 die("close failed on standard output: %s", strerror(errno));
308 return 0;
309 }
310
311 static void handle_internal_command(int argc, const char **argv)
312 {
313 const char *cmd = argv[0];
314 static struct cmd_struct commands[] = {
315 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
316 { "annotate", cmd_annotate, RUN_SETUP },
317 { "apply", cmd_apply },
318 { "archive", cmd_archive },
319 { "blame", cmd_blame, RUN_SETUP },
320 { "branch", cmd_branch, RUN_SETUP },
321 { "bundle", cmd_bundle },
322 { "cat-file", cmd_cat_file, RUN_SETUP },
323 { "checkout-index", cmd_checkout_index,
324 RUN_SETUP | NEED_WORK_TREE},
325 { "check-ref-format", cmd_check_ref_format },
326 { "check-attr", cmd_check_attr, RUN_SETUP | NEED_WORK_TREE },
327 { "cherry", cmd_cherry, RUN_SETUP },
328 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
329 { "commit-tree", cmd_commit_tree, RUN_SETUP },
330 { "config", cmd_config },
331 { "count-objects", cmd_count_objects, RUN_SETUP },
332 { "describe", cmd_describe, RUN_SETUP },
333 { "diff", cmd_diff },
334 { "diff-files", cmd_diff_files },
335 { "diff-index", cmd_diff_index, RUN_SETUP },
336 { "diff-tree", cmd_diff_tree, RUN_SETUP },
337 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
338 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
339 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
340 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
341 { "format-patch", cmd_format_patch, RUN_SETUP },
342 { "fsck", cmd_fsck, RUN_SETUP },
343 { "fsck-objects", cmd_fsck, RUN_SETUP },
344 { "gc", cmd_gc, RUN_SETUP },
345 { "get-tar-commit-id", cmd_get_tar_commit_id },
346 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
347 { "help", cmd_help },
348 #ifndef NO_CURL
349 { "http-fetch", cmd_http_fetch, RUN_SETUP },
350 #endif
351 { "init", cmd_init_db },
352 { "init-db", cmd_init_db },
353 { "log", cmd_log, RUN_SETUP | USE_PAGER },
354 { "ls-files", cmd_ls_files, RUN_SETUP },
355 { "ls-tree", cmd_ls_tree, RUN_SETUP },
356 { "mailinfo", cmd_mailinfo },
357 { "mailsplit", cmd_mailsplit },
358 { "merge-base", cmd_merge_base, RUN_SETUP },
359 { "merge-file", cmd_merge_file },
360 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
361 { "name-rev", cmd_name_rev, RUN_SETUP },
362 { "pack-objects", cmd_pack_objects, RUN_SETUP },
363 { "pickaxe", cmd_blame, RUN_SETUP },
364 { "prune", cmd_prune, RUN_SETUP },
365 { "prune-packed", cmd_prune_packed, RUN_SETUP },
366 { "push", cmd_push, RUN_SETUP },
367 { "read-tree", cmd_read_tree, RUN_SETUP },
368 { "reflog", cmd_reflog, RUN_SETUP },
369 { "repo-config", cmd_config },
370 { "rerere", cmd_rerere, RUN_SETUP },
371 { "reset", cmd_reset, RUN_SETUP },
372 { "rev-list", cmd_rev_list, RUN_SETUP },
373 { "rev-parse", cmd_rev_parse, RUN_SETUP },
374 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
375 { "rm", cmd_rm, RUN_SETUP | NEED_WORK_TREE },
376 { "runstatus", cmd_runstatus, RUN_SETUP | NEED_WORK_TREE },
377 { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
378 { "show-branch", cmd_show_branch, RUN_SETUP },
379 { "show", cmd_show, RUN_SETUP | USE_PAGER },
380 { "stripspace", cmd_stripspace },
381 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
382 { "tag", cmd_tag, RUN_SETUP },
383 { "tar-tree", cmd_tar_tree },
384 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
385 { "update-index", cmd_update_index, RUN_SETUP },
386 { "update-ref", cmd_update_ref, RUN_SETUP },
387 { "upload-archive", cmd_upload_archive },
388 { "verify-tag", cmd_verify_tag, RUN_SETUP },
389 { "version", cmd_version },
390 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
391 { "write-tree", cmd_write_tree, RUN_SETUP },
392 { "verify-pack", cmd_verify_pack },
393 { "show-ref", cmd_show_ref, RUN_SETUP },
394 { "pack-refs", cmd_pack_refs, RUN_SETUP },
395 };
396 int i;
397
398 /* Turn "git cmd --help" into "git help cmd" */
399 if (argc > 1 && !strcmp(argv[1], "--help")) {
400 argv[1] = argv[0];
401 argv[0] = cmd = "help";
402 }
403
404 for (i = 0; i < ARRAY_SIZE(commands); i++) {
405 struct cmd_struct *p = commands+i;
406 if (strcmp(p->cmd, cmd))
407 continue;
408 exit(run_command(p, argc, argv));
409 }
410 }
411
412 int main(int argc, const char **argv)
413 {
414 const char *cmd = argv[0] ? argv[0] : "git-help";
415 char *slash = strrchr(cmd, '/');
416 const char *exec_path = NULL;
417 int done_alias = 0;
418
419 /*
420 * Take the basename of argv[0] as the command
421 * name, and the dirname as the default exec_path
422 * if it's an absolute path and we don't have
423 * anything better.
424 */
425 if (slash) {
426 *slash++ = 0;
427 if (*cmd == '/')
428 exec_path = cmd;
429 cmd = slash;
430 }
431
432 /*
433 * "git-xxxx" is the same as "git xxxx", but we obviously:
434 *
435 * - cannot take flags in between the "git" and the "xxxx".
436 * - cannot execute it externally (since it would just do
437 * the same thing over again)
438 *
439 * So we just directly call the internal command handler, and
440 * die if that one cannot handle it.
441 */
442 if (!prefixcmp(cmd, "git-")) {
443 cmd += 4;
444 argv[0] = cmd;
445 handle_internal_command(argc, argv);
446 die("cannot handle %s internally", cmd);
447 }
448
449 /* Look for flags.. */
450 argv++;
451 argc--;
452 handle_options(&argv, &argc, NULL);
453 if (argc > 0) {
454 if (!prefixcmp(argv[0], "--"))
455 argv[0] += 2;
456 } else {
457 /* Default command: "help" */
458 argv[0] = "help";
459 argc = 1;
460 }
461 cmd = argv[0];
462
463 /*
464 * We execute external git command via execv_git_cmd(),
465 * which looks at "--exec-path" option, GIT_EXEC_PATH
466 * environment, and $(gitexecdir) in Makefile while built,
467 * in this order. For scripted commands, we prepend
468 * the value of the exec_path variable to the PATH.
469 */
470 if (exec_path)
471 prepend_to_path(exec_path, strlen(exec_path));
472 exec_path = git_exec_path();
473 prepend_to_path(exec_path, strlen(exec_path));
474
475 while (1) {
476 /* See if it's an internal command */
477 handle_internal_command(argc, argv);
478
479 /* .. then try the external ones */
480 execv_git_cmd(argv);
481
482 /* It could be an alias -- this works around the insanity
483 * of overriding "git log" with "git show" by having
484 * alias.log = show
485 */
486 if (done_alias || !handle_alias(&argc, &argv))
487 break;
488 done_alias = 1;
489 }
490
491 if (errno == ENOENT) {
492 if (done_alias) {
493 fprintf(stderr, "Expansion of alias '%s' failed; "
494 "'%s' is not a git-command\n",
495 cmd, argv[0]);
496 exit(1);
497 }
498 help_unknown_cmd(cmd);
499 }
500
501 fprintf(stderr, "Failed to run command '%s': %s\n",
502 cmd, strerror(errno));
503
504 return 1;
505 }