git-send-email: Do not make @-less message ID
[git/git.git] / git.c
CommitLineData
85023577 1#include "builtin.h"
77cb17e9 2#include "exec_cmd.h"
2b11e317 3#include "cache.h"
575ba9d6 4#include "quote.h"
8e49d503 5
822a7d50 6const char git_usage_string[] =
281e67d6 7 "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate] [--bare] [--git-dir=GIT_DIR] [--help] COMMAND [ARGS]";
822a7d50 8
8e49d503
AE
9static void prepend_to_path(const char *dir, int len)
10{
554fe20d
TH
11 const char *old_path = getenv("PATH");
12 char *path;
8e49d503
AE
13 int path_len = len;
14
15 if (!old_path)
7dbc2c04 16 old_path = "/usr/local/bin:/usr/bin:/bin";
8e49d503
AE
17
18 path_len = len + strlen(old_path) + 1;
19
2d7320d0 20 path = xmalloc(path_len + 1);
8e49d503
AE
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);
0caea90b
CC
27
28 free(path);
8e49d503
AE
29}
30
4ab243a9
JS
31static int handle_options(const char*** argv, int* argc)
32{
33 int handled = 0;
34
35 while (*argc > 0) {
36 const char *cmd = (*argv)[0];
37 if (cmd[0] != '-')
38 break;
39
6acbcb92
JS
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 */
cc44c765 51 if (!prefixcmp(cmd, "--exec-path")) {
6acbcb92
JS
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")) {
4ab243a9 60 setup_pager();
6acbcb92 61 } else if (!strcmp(cmd, "--git-dir")) {
c321f00d
BG
62 if (*argc < 2) {
63 fprintf(stderr, "No directory given for --git-dir.\n" );
64 usage(git_usage_string);
65 }
45b09794 66 setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
6acbcb92
JS
67 (*argv)++;
68 (*argc)--;
e4b02333 69 handled++;
cc44c765 70 } else if (!prefixcmp(cmd, "--git-dir=")) {
45b09794 71 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
6acbcb92 72 } else if (!strcmp(cmd, "--bare")) {
ef5ddb2f 73 static char git_dir[PATH_MAX+1];
45b09794 74 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 1);
6acbcb92
JS
75 } else {
76 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 77 usage(git_usage_string);
6acbcb92 78 }
4ab243a9
JS
79
80 (*argv)++;
81 (*argc)--;
82 handled++;
83 }
84 return handled;
85}
86
2b11e317 87static const char *alias_command;
96f1e58f 88static char *alias_string;
2b11e317
JS
89
90static int git_alias_config(const char *var, const char *value)
91{
cc44c765 92 if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
9befac47 93 alias_string = xstrdup(value);
2b11e317
JS
94 }
95 return 0;
96}
97
98static int split_cmdline(char *cmdline, const char ***argv)
99{
100 int src, dst, count = 0, size = 16;
101 char quoted = 0;
102
3301521a 103 *argv = xmalloc(sizeof(char*) * size);
2b11e317
JS
104
105 /* split alias_string */
106 (*argv)[count++] = cmdline;
107 for (src = dst = 0; cmdline[src];) {
108 char c = cmdline[src];
109 if (!quoted && isspace(c)) {
110 cmdline[dst++] = 0;
111 while (cmdline[++src]
112 && isspace(cmdline[src]))
113 ; /* skip */
114 if (count >= size) {
115 size += 16;
83572c1a 116 *argv = xrealloc(*argv, sizeof(char*) * size);
2b11e317
JS
117 }
118 (*argv)[count++] = cmdline + dst;
119 } else if(!quoted && (c == '\'' || c == '"')) {
120 quoted = c;
121 src++;
122 } else if (c == quoted) {
123 quoted = 0;
124 src++;
125 } else {
126 if (c == '\\' && quoted != '\'') {
127 src++;
128 c = cmdline[src];
129 if (!c) {
130 free(*argv);
131 *argv = NULL;
132 return error("cmdline ends with \\");
133 }
134 }
135 cmdline[dst++] = c;
136 src++;
137 }
138 }
139
140 cmdline[dst] = 0;
141
142 if (quoted) {
143 free(*argv);
144 *argv = NULL;
145 return error("unclosed quote");
146 }
147
148 return count;
149}
150
151static int handle_alias(int *argcp, const char ***argv)
152{
47e5c0ca 153 int nongit = 0, ret = 0, saved_errno = errno;
2b11e317 154 const char *subdir;
0347a8c7
ML
155 int count, option_count;
156 const char** new_argv;
2b11e317
JS
157
158 subdir = setup_git_directory_gently(&nongit);
0347a8c7
ML
159
160 alias_command = (*argv)[0];
161 git_config(git_alias_config);
162 if (alias_string) {
dfd42a3c
TT
163 if (alias_string[0] == '!') {
164 trace_printf("trace: alias to shell cmd: %s => %s\n",
165 alias_command, alias_string + 1);
166 ret = system(alias_string + 1);
167 if (ret >= 0 && WIFEXITED(ret) &&
168 WEXITSTATUS(ret) != 127)
169 exit(WEXITSTATUS(ret));
170 die("Failed to run '%s' when expanding alias '%s'\n",
171 alias_string + 1, alias_command);
172 }
0347a8c7
ML
173 count = split_cmdline(alias_string, &new_argv);
174 option_count = handle_options(&new_argv, &count);
175 memmove(new_argv - option_count, new_argv,
176 count * sizeof(char *));
177 new_argv -= option_count;
178
179 if (count < 1)
180 die("empty alias for %s", alias_command);
181
182 if (!strcmp(alias_command, new_argv[0]))
183 die("recursive alias: %s", alias_command);
184
6ce4e61f
CC
185 trace_argv_printf(new_argv, count,
186 "trace: alias expansion: %s =>",
187 alias_command);
575ba9d6 188
83572c1a
JF
189 new_argv = xrealloc(new_argv, sizeof(char*) *
190 (count + *argcp + 1));
0347a8c7
ML
191 /* insert after command name */
192 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
193 new_argv[count+*argcp] = NULL;
2b11e317 194
0347a8c7
ML
195 *argv = new_argv;
196 *argcp += count - 1;
2b11e317 197
0347a8c7 198 ret = 1;
2b11e317
JS
199 }
200
201 if (subdir)
202 chdir(subdir);
203
47e5c0ca
JS
204 errno = saved_errno;
205
2b11e317
JS
206 return ret;
207}
208
70827b15 209const char git_version_string[] = GIT_VERSION;
5b84f4d8 210
efffea03
JH
211#define RUN_SETUP (1<<0)
212#define USE_PAGER (1<<1)
7eff28a9
SP
213/*
214 * require working tree to be present -- anything uses this needs
215 * RUN_SETUP for reading from the configuration file.
216 */
217#define NOT_BARE (1<<2)
a633fca0 218
9201c707 219static void handle_internal_command(int argc, const char **argv, char **envp)
231af832
LT
220{
221 const char *cmd = argv[0];
222 static struct cmd_struct {
223 const char *cmd;
a633fca0 224 int (*fn)(int, const char **, const char *);
9590b041 225 int option;
231af832 226 } commands[] = {
7eff28a9 227 { "add", cmd_add, RUN_SETUP | NOT_BARE },
5b6dedd6 228 { "annotate", cmd_annotate, RUN_SETUP | USE_PAGER },
f754fa9c 229 { "apply", cmd_apply },
265d5280 230 { "archive", cmd_archive },
4f0219a4 231 { "blame", cmd_blame, RUN_SETUP },
1da1b3a3 232 { "branch", cmd_branch, RUN_SETUP },
2e0afafe 233 { "bundle", cmd_bundle },
efffea03
JH
234 { "cat-file", cmd_cat_file, RUN_SETUP },
235 { "checkout-index", cmd_checkout_index, RUN_SETUP },
0864f264 236 { "check-ref-format", cmd_check_ref_format },
d0bfd026 237 { "check-attr", cmd_check_attr, RUN_SETUP | NOT_BARE },
e827633a 238 { "cherry", cmd_cherry, RUN_SETUP },
9509af68 239 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NOT_BARE },
efffea03 240 { "commit-tree", cmd_commit_tree, RUN_SETUP },
e0d10e1c 241 { "config", cmd_config },
8112894d 242 { "count-objects", cmd_count_objects, RUN_SETUP },
9a0eaf83 243 { "describe", cmd_describe, RUN_SETUP },
d516c2d1
JS
244 { "diff", cmd_diff, USE_PAGER },
245 { "diff-files", cmd_diff_files },
efffea03 246 { "diff-index", cmd_diff_index, RUN_SETUP },
efffea03 247 { "diff-tree", cmd_diff_tree, RUN_SETUP },
d4289fff 248 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
efffea03 249 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
9f613ddd 250 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
efffea03 251 { "format-patch", cmd_format_patch, RUN_SETUP },
b4dfefe0
MW
252 { "fsck", cmd_fsck, RUN_SETUP },
253 { "fsck-objects", cmd_fsck, RUN_SETUP },
6757ada4 254 { "gc", cmd_gc, RUN_SETUP },
f754fa9c 255 { "get-tar-commit-id", cmd_get_tar_commit_id },
34c6a82b 256 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
f754fa9c 257 { "help", cmd_help },
515377ea 258 { "init", cmd_init_db },
f754fa9c 259 { "init-db", cmd_init_db },
efffea03
JH
260 { "log", cmd_log, RUN_SETUP | USE_PAGER },
261 { "ls-files", cmd_ls_files, RUN_SETUP },
262 { "ls-tree", cmd_ls_tree, RUN_SETUP },
f754fa9c
JH
263 { "mailinfo", cmd_mailinfo },
264 { "mailsplit", cmd_mailsplit },
71dfbf22 265 { "merge-base", cmd_merge_base, RUN_SETUP },
ba1f5f35 266 { "merge-file", cmd_merge_file },
7eff28a9 267 { "mv", cmd_mv, RUN_SETUP | NOT_BARE },
efffea03
JH
268 { "name-rev", cmd_name_rev, RUN_SETUP },
269 { "pack-objects", cmd_pack_objects, RUN_SETUP },
acca687f 270 { "pickaxe", cmd_blame, RUN_SETUP | USE_PAGER },
efffea03
JH
271 { "prune", cmd_prune, RUN_SETUP },
272 { "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085 273 { "push", cmd_push, RUN_SETUP },
efffea03 274 { "read-tree", cmd_read_tree, RUN_SETUP },
4264dc15 275 { "reflog", cmd_reflog, RUN_SETUP },
e0d10e1c 276 { "repo-config", cmd_config },
658f3650 277 { "rerere", cmd_rerere, RUN_SETUP },
efffea03
JH
278 { "rev-list", cmd_rev_list, RUN_SETUP },
279 { "rev-parse", cmd_rev_parse, RUN_SETUP },
9509af68 280 { "revert", cmd_revert, RUN_SETUP | NOT_BARE },
7eff28a9
SP
281 { "rm", cmd_rm, RUN_SETUP | NOT_BARE },
282 { "runstatus", cmd_runstatus, RUN_SETUP | NOT_BARE },
1d541c12 283 { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
efffea03
JH
284 { "show-branch", cmd_show_branch, RUN_SETUP },
285 { "show", cmd_show, RUN_SETUP | USE_PAGER },
f754fa9c 286 { "stripspace", cmd_stripspace },
efffea03 287 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
9cb90b80 288 { "tar-tree", cmd_tar_tree },
efffea03
JH
289 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
290 { "update-index", cmd_update_index, RUN_SETUP },
291 { "update-ref", cmd_update_ref, RUN_SETUP },
39345a21 292 { "upload-archive", cmd_upload_archive },
f754fa9c 293 { "version", cmd_version },
efffea03
JH
294 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
295 { "write-tree", cmd_write_tree, RUN_SETUP },
2e3ed670 296 { "verify-pack", cmd_verify_pack },
358ddb62 297 { "show-ref", cmd_show_ref, RUN_SETUP },
e1e22e37 298 { "pack-refs", cmd_pack_refs, RUN_SETUP },
231af832
LT
299 };
300 int i;
301
1cd95087
LT
302 /* Turn "git cmd --help" into "git help cmd" */
303 if (argc > 1 && !strcmp(argv[1], "--help")) {
304 argv[1] = argv[0];
305 argv[0] = cmd = "help";
306 }
307
231af832
LT
308 for (i = 0; i < ARRAY_SIZE(commands); i++) {
309 struct cmd_struct *p = commands+i;
a633fca0 310 const char *prefix;
231af832
LT
311 if (strcmp(p->cmd, cmd))
312 continue;
575ba9d6 313
a633fca0 314 prefix = NULL;
efffea03 315 if (p->option & RUN_SETUP)
a633fca0 316 prefix = setup_git_directory();
9590b041
JH
317 if (p->option & USE_PAGER)
318 setup_pager();
6d9ba67b
JS
319 if ((p->option & NOT_BARE) &&
320 (is_bare_repository() || is_inside_git_dir()))
321 die("%s must be run in a work tree", cmd);
6ce4e61f 322 trace_argv_printf(argv, argc, "trace: built-in: git");
575ba9d6 323
a633fca0 324 exit(p->fn(argc, argv, prefix));
231af832
LT
325 }
326}
327
9201c707 328int main(int argc, const char **argv, char **envp)
8e49d503 329{
5b6df8e4 330 const char *cmd = argv[0] ? argv[0] : "git-help";
231af832 331 char *slash = strrchr(cmd, '/');
231af832 332 const char *exec_path = NULL;
a025463b 333 int done_alias = 0;
231af832
LT
334
335 /*
336 * Take the basename of argv[0] as the command
337 * name, and the dirname as the default exec_path
338 * if it's an absolute path and we don't have
339 * anything better.
340 */
341 if (slash) {
342 *slash++ = 0;
343 if (*cmd == '/')
344 exec_path = cmd;
345 cmd = slash;
346 }
8e49d503 347
231af832
LT
348 /*
349 * "git-xxxx" is the same as "git xxxx", but we obviously:
350 *
351 * - cannot take flags in between the "git" and the "xxxx".
352 * - cannot execute it externally (since it would just do
353 * the same thing over again)
354 *
355 * So we just directly call the internal command handler, and
356 * die if that one cannot handle it.
357 */
cc44c765 358 if (!prefixcmp(cmd, "git-")) {
231af832
LT
359 cmd += 4;
360 argv[0] = cmd;
361 handle_internal_command(argc, argv, envp);
362 die("cannot handle %s internally", cmd);
363 }
8e49d503 364
231af832 365 /* Look for flags.. */
6acbcb92
JS
366 argv++;
367 argc--;
368 handle_options(&argv, &argc);
369 if (argc > 0) {
cc44c765 370 if (!prefixcmp(argv[0], "--"))
6acbcb92
JS
371 argv[0] += 2;
372 } else {
373 /* Default command: "help" */
374 argv[0] = "help";
375 argc = 1;
97fc6c5f 376 }
6acbcb92 377 cmd = argv[0];
231af832
LT
378
379 /*
380 * We search for git commands in the following order:
381 * - git_exec_path()
382 * - the path of the "git" command if we could find it
383 * in $0
384 * - the regular PATH.
385 */
386 if (exec_path)
387 prepend_to_path(exec_path, strlen(exec_path));
77cb17e9
MO
388 exec_path = git_exec_path();
389 prepend_to_path(exec_path, strlen(exec_path));
8e49d503 390
a025463b
JH
391 while (1) {
392 /* See if it's an internal command */
393 handle_internal_command(argc, argv, envp);
2b11e317 394
a025463b
JH
395 /* .. then try the external ones */
396 execv_git_cmd(argv);
231af832 397
a025463b
JH
398 /* It could be an alias -- this works around the insanity
399 * of overriding "git log" with "git show" by having
400 * alias.log = show
401 */
402 if (done_alias || !handle_alias(&argc, &argv))
403 break;
404 done_alias = 1;
405 }
10b15b86 406
f3dd015c
TT
407 if (errno == ENOENT) {
408 if (done_alias) {
409 fprintf(stderr, "Expansion of alias '%s' failed; "
410 "'%s' is not a git-command\n",
411 cmd, argv[0]);
412 exit(1);
413 }
822a7d50 414 help_unknown_cmd(cmd);
f3dd015c 415 }
10b15b86
AR
416
417 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 418 cmd, strerror(errno));
8e49d503
AE
419
420 return 1;
421}