builtins: Makefile clean-up
[git/git.git] / git.c
CommitLineData
8e49d503 1#include <stdio.h>
7dbc2c04
JH
2#include <sys/types.h>
3#include <sys/stat.h>
4#include <dirent.h>
8e49d503
AE
5#include <unistd.h>
6#include <stdlib.h>
7#include <string.h>
8#include <errno.h>
9#include <limits.h>
10#include <stdarg.h>
4050c0df 11#include "git-compat-util.h"
77cb17e9 12#include "exec_cmd.h"
2b11e317 13#include "cache.h"
575ba9d6 14#include "quote.h"
8e49d503 15
70827b15 16#include "builtin.h"
8e49d503 17
822a7d50
RJ
18const char git_usage_string[] =
19 "git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
20
8e49d503
AE
21static void prepend_to_path(const char *dir, int len)
22{
554fe20d
TH
23 const char *old_path = getenv("PATH");
24 char *path;
8e49d503
AE
25 int path_len = len;
26
27 if (!old_path)
7dbc2c04 28 old_path = "/usr/local/bin:/usr/bin:/bin";
8e49d503
AE
29
30 path_len = len + strlen(old_path) + 1;
31
32 path = malloc(path_len + 1);
8e49d503
AE
33
34 memcpy(path, dir, len);
35 path[len] = ':';
36 memcpy(path + len + 1, old_path, path_len - len);
37
38 setenv("PATH", path, 1);
39}
40
4ab243a9
JS
41static int handle_options(const char*** argv, int* argc)
42{
43 int handled = 0;
44
45 while (*argc > 0) {
46 const char *cmd = (*argv)[0];
47 if (cmd[0] != '-')
48 break;
49
6acbcb92
JS
50 /*
51 * For legacy reasons, the "version" and "help"
52 * commands can be written with "--" prepended
53 * to make them look like flags.
54 */
55 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
56 break;
57
58 /*
59 * Check remaining flags.
60 */
61 if (!strncmp(cmd, "--exec-path", 11)) {
62 cmd += 11;
63 if (*cmd == '=')
64 git_set_exec_path(cmd + 1);
65 else {
66 puts(git_exec_path());
67 exit(0);
68 }
69 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
4ab243a9 70 setup_pager();
6acbcb92
JS
71 } else if (!strcmp(cmd, "--git-dir")) {
72 if (*argc < 1)
73 return -1;
74 setenv("GIT_DIR", (*argv)[1], 1);
75 (*argv)++;
76 (*argc)--;
77 } else if (!strncmp(cmd, "--git-dir=", 10)) {
78 setenv("GIT_DIR", cmd + 10, 1);
79 } else if (!strcmp(cmd, "--bare")) {
80 static char git_dir[1024];
81 setenv("GIT_DIR", getcwd(git_dir, 1024), 1);
82 } else {
83 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 84 usage(git_usage_string);
6acbcb92 85 }
4ab243a9
JS
86
87 (*argv)++;
88 (*argc)--;
89 handled++;
90 }
91 return handled;
92}
93
2b11e317
JS
94static const char *alias_command;
95static char *alias_string = NULL;
96
97static int git_alias_config(const char *var, const char *value)
98{
99 if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
100 alias_string = strdup(value);
101 }
102 return 0;
103}
104
105static int split_cmdline(char *cmdline, const char ***argv)
106{
107 int src, dst, count = 0, size = 16;
108 char quoted = 0;
109
110 *argv = malloc(sizeof(char*) * size);
111
112 /* split alias_string */
113 (*argv)[count++] = cmdline;
114 for (src = dst = 0; cmdline[src];) {
115 char c = cmdline[src];
116 if (!quoted && isspace(c)) {
117 cmdline[dst++] = 0;
118 while (cmdline[++src]
119 && isspace(cmdline[src]))
120 ; /* skip */
121 if (count >= size) {
122 size += 16;
123 *argv = realloc(*argv, sizeof(char*) * size);
124 }
125 (*argv)[count++] = cmdline + dst;
126 } else if(!quoted && (c == '\'' || c == '"')) {
127 quoted = c;
128 src++;
129 } else if (c == quoted) {
130 quoted = 0;
131 src++;
132 } else {
133 if (c == '\\' && quoted != '\'') {
134 src++;
135 c = cmdline[src];
136 if (!c) {
137 free(*argv);
138 *argv = NULL;
139 return error("cmdline ends with \\");
140 }
141 }
142 cmdline[dst++] = c;
143 src++;
144 }
145 }
146
147 cmdline[dst] = 0;
148
149 if (quoted) {
150 free(*argv);
151 *argv = NULL;
152 return error("unclosed quote");
153 }
154
155 return count;
156}
157
158static int handle_alias(int *argcp, const char ***argv)
159{
47e5c0ca 160 int nongit = 0, ret = 0, saved_errno = errno;
2b11e317 161 const char *subdir;
0347a8c7
ML
162 int count, option_count;
163 const char** new_argv;
2b11e317
JS
164
165 subdir = setup_git_directory_gently(&nongit);
0347a8c7
ML
166
167 alias_command = (*argv)[0];
168 git_config(git_alias_config);
169 if (alias_string) {
170 count = split_cmdline(alias_string, &new_argv);
171 option_count = handle_options(&new_argv, &count);
172 memmove(new_argv - option_count, new_argv,
173 count * sizeof(char *));
174 new_argv -= option_count;
175
176 if (count < 1)
177 die("empty alias for %s", alias_command);
178
179 if (!strcmp(alias_command, new_argv[0]))
180 die("recursive alias: %s", alias_command);
181
182 if (getenv("GIT_TRACE")) {
183 int i;
184 fprintf(stderr, "trace: alias expansion: %s =>",
185 alias_command);
186 for (i = 0; i < count; ++i) {
187 fputc(' ', stderr);
188 sq_quote_print(stderr, new_argv[i]);
575ba9d6 189 }
0347a8c7
ML
190 fputc('\n', stderr);
191 fflush(stderr);
192 }
575ba9d6 193
0347a8c7
ML
194 new_argv = realloc(new_argv, sizeof(char*) *
195 (count + *argcp + 1));
196 /* insert after command name */
197 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
198 new_argv[count+*argcp] = NULL;
2b11e317 199
0347a8c7
ML
200 *argv = new_argv;
201 *argcp += count - 1;
2b11e317 202
0347a8c7 203 ret = 1;
2b11e317
JS
204 }
205
206 if (subdir)
207 chdir(subdir);
208
47e5c0ca
JS
209 errno = saved_errno;
210
2b11e317
JS
211 return ret;
212}
213
70827b15 214const char git_version_string[] = GIT_VERSION;
5b84f4d8 215
a633fca0 216#define NEEDS_PREFIX 1
9590b041 217#define USE_PAGER 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[] = {
a633fca0 227 { "add", cmd_add, NEEDS_PREFIX },
f754fa9c
JH
228 { "apply", cmd_apply },
229 { "cat-file", cmd_cat_file, NEEDS_PREFIX },
230 { "checkout-index", cmd_checkout_index, NEEDS_PREFIX },
0864f264 231 { "check-ref-format", cmd_check_ref_format },
a633fca0 232 { "commit-tree", cmd_commit_tree, NEEDS_PREFIX },
f754fa9c
JH
233 { "count-objects", cmd_count_objects },
234 { "diff", cmd_diff, NEEDS_PREFIX },
a633fca0
LT
235 { "diff-files", cmd_diff_files, NEEDS_PREFIX },
236 { "diff-index", cmd_diff_index, NEEDS_PREFIX },
237 { "diff-stages", cmd_diff_stages, NEEDS_PREFIX },
238 { "diff-tree", cmd_diff_tree, NEEDS_PREFIX },
a633fca0 239 { "fmt-merge-msg", cmd_fmt_merge_msg, NEEDS_PREFIX },
f754fa9c
JH
240 { "format-patch", cmd_format_patch, NEEDS_PREFIX },
241 { "get-tar-commit-id", cmd_get_tar_commit_id },
242 { "grep", cmd_grep, NEEDS_PREFIX },
243 { "help", cmd_help },
244 { "init-db", cmd_init_db },
245 { "log", cmd_log, NEEDS_PREFIX | USE_PAGER },
246 { "ls-files", cmd_ls_files, NEEDS_PREFIX },
247 { "ls-tree", cmd_ls_tree, NEEDS_PREFIX },
248 { "mailinfo", cmd_mailinfo },
249 { "mailsplit", cmd_mailsplit },
7061cf0f 250 { "mv", cmd_mv, NEEDS_PREFIX },
d6b64ed0 251 { "name-rev", cmd_name_rev, NEEDS_PREFIX },
5d4a6003 252 { "pack-objects", cmd_pack_objects, NEEDS_PREFIX },
f754fa9c
JH
253 { "prune", cmd_prune, NEEDS_PREFIX },
254 { "prune-packed", cmd_prune_packed, NEEDS_PREFIX },
255 { "push", cmd_push },
256 { "read-tree", cmd_read_tree, NEEDS_PREFIX },
257 { "repo-config", cmd_repo_config },
258 { "rev-list", cmd_rev_list, NEEDS_PREFIX },
259 { "rev-parse", cmd_rev_parse, NEEDS_PREFIX },
260 { "rm", cmd_rm, NEEDS_PREFIX },
261 { "show-branch", cmd_show_branch, NEEDS_PREFIX },
262 { "show", cmd_show, NEEDS_PREFIX | USE_PAGER },
263 { "stripspace", cmd_stripspace },
640ce105 264 { "symbolic-ref", cmd_symbolic_ref, NEEDS_PREFIX },
f754fa9c
JH
265 { "tar-tree", cmd_tar_tree, NEEDS_PREFIX },
266 { "unpack-objects", cmd_unpack_objects, NEEDS_PREFIX },
267 { "update-index", cmd_update_index, NEEDS_PREFIX },
268 { "update-ref", cmd_update_ref, NEEDS_PREFIX },
269 { "upload-tar", cmd_upload_tar },
270 { "version", cmd_version },
271 { "whatchanged", cmd_whatchanged, NEEDS_PREFIX | USE_PAGER },
272 { "write-tree", cmd_write_tree, NEEDS_PREFIX },
231af832
LT
273 };
274 int i;
275
1cd95087
LT
276 /* Turn "git cmd --help" into "git help cmd" */
277 if (argc > 1 && !strcmp(argv[1], "--help")) {
278 argv[1] = argv[0];
279 argv[0] = cmd = "help";
280 }
281
231af832
LT
282 for (i = 0; i < ARRAY_SIZE(commands); i++) {
283 struct cmd_struct *p = commands+i;
a633fca0 284 const char *prefix;
231af832
LT
285 if (strcmp(p->cmd, cmd))
286 continue;
575ba9d6 287
a633fca0 288 prefix = NULL;
9590b041 289 if (p->option & NEEDS_PREFIX)
a633fca0 290 prefix = setup_git_directory();
9590b041
JH
291 if (p->option & USE_PAGER)
292 setup_pager();
575ba9d6
ML
293 if (getenv("GIT_TRACE")) {
294 int i;
295 fprintf(stderr, "trace: built-in: git");
296 for (i = 0; i < argc; ++i) {
297 fputc(' ', stderr);
298 sq_quote_print(stderr, argv[i]);
299 }
300 putc('\n', stderr);
301 fflush(stderr);
302 }
303
a633fca0 304 exit(p->fn(argc, argv, prefix));
231af832
LT
305 }
306}
307
9201c707 308int main(int argc, const char **argv, char **envp)
8e49d503 309{
9201c707 310 const char *cmd = argv[0];
231af832 311 char *slash = strrchr(cmd, '/');
231af832 312 const char *exec_path = NULL;
a025463b 313 int done_alias = 0;
231af832
LT
314
315 /*
316 * Take the basename of argv[0] as the command
317 * name, and the dirname as the default exec_path
318 * if it's an absolute path and we don't have
319 * anything better.
320 */
321 if (slash) {
322 *slash++ = 0;
323 if (*cmd == '/')
324 exec_path = cmd;
325 cmd = slash;
326 }
8e49d503 327
231af832
LT
328 /*
329 * "git-xxxx" is the same as "git xxxx", but we obviously:
330 *
331 * - cannot take flags in between the "git" and the "xxxx".
332 * - cannot execute it externally (since it would just do
333 * the same thing over again)
334 *
335 * So we just directly call the internal command handler, and
336 * die if that one cannot handle it.
337 */
338 if (!strncmp(cmd, "git-", 4)) {
339 cmd += 4;
340 argv[0] = cmd;
341 handle_internal_command(argc, argv, envp);
342 die("cannot handle %s internally", cmd);
343 }
8e49d503 344
231af832 345 /* Look for flags.. */
6acbcb92
JS
346 argv++;
347 argc--;
348 handle_options(&argv, &argc);
349 if (argc > 0) {
350 if (!strncmp(argv[0], "--", 2))
351 argv[0] += 2;
352 } else {
353 /* Default command: "help" */
354 argv[0] = "help";
355 argc = 1;
97fc6c5f 356 }
6acbcb92 357 cmd = argv[0];
231af832
LT
358
359 /*
360 * We search for git commands in the following order:
361 * - git_exec_path()
362 * - the path of the "git" command if we could find it
363 * in $0
364 * - the regular PATH.
365 */
366 if (exec_path)
367 prepend_to_path(exec_path, strlen(exec_path));
77cb17e9
MO
368 exec_path = git_exec_path();
369 prepend_to_path(exec_path, strlen(exec_path));
8e49d503 370
a025463b
JH
371 while (1) {
372 /* See if it's an internal command */
373 handle_internal_command(argc, argv, envp);
2b11e317 374
a025463b
JH
375 /* .. then try the external ones */
376 execv_git_cmd(argv);
231af832 377
a025463b
JH
378 /* It could be an alias -- this works around the insanity
379 * of overriding "git log" with "git show" by having
380 * alias.log = show
381 */
382 if (done_alias || !handle_alias(&argc, &argv))
383 break;
384 done_alias = 1;
385 }
10b15b86
AR
386
387 if (errno == ENOENT)
822a7d50 388 help_unknown_cmd(cmd);
10b15b86
AR
389
390 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 391 cmd, strerror(errno));
8e49d503
AE
392
393 return 1;
394}