Don't save the commit buffer in git-describe.
[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 */
51 if (!strncmp(cmd, "--exec-path", 11)) {
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)--;
69 } else if (!strncmp(cmd, "--git-dir=", 10)) {
45b09794 70 setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
6acbcb92 71 } else if (!strcmp(cmd, "--bare")) {
ef5ddb2f 72 static char git_dir[PATH_MAX+1];
45b09794 73 setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 1);
6acbcb92
JS
74 } else {
75 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 76 usage(git_usage_string);
6acbcb92 77 }
4ab243a9
JS
78
79 (*argv)++;
80 (*argc)--;
81 handled++;
82 }
83 return handled;
84}
85
2b11e317 86static const char *alias_command;
96f1e58f 87static char *alias_string;
2b11e317
JS
88
89static int git_alias_config(const char *var, const char *value)
90{
91 if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
9befac47 92 alias_string = xstrdup(value);
2b11e317
JS
93 }
94 return 0;
95}
96
97static int split_cmdline(char *cmdline, const char ***argv)
98{
99 int src, dst, count = 0, size = 16;
100 char quoted = 0;
101
102 *argv = malloc(sizeof(char*) * size);
103
104 /* split alias_string */
105 (*argv)[count++] = cmdline;
106 for (src = dst = 0; cmdline[src];) {
107 char c = cmdline[src];
108 if (!quoted && isspace(c)) {
109 cmdline[dst++] = 0;
110 while (cmdline[++src]
111 && isspace(cmdline[src]))
112 ; /* skip */
113 if (count >= size) {
114 size += 16;
83572c1a 115 *argv = xrealloc(*argv, sizeof(char*) * size);
2b11e317
JS
116 }
117 (*argv)[count++] = cmdline + dst;
118 } else if(!quoted && (c == '\'' || c == '"')) {
119 quoted = c;
120 src++;
121 } else if (c == quoted) {
122 quoted = 0;
123 src++;
124 } else {
125 if (c == '\\' && quoted != '\'') {
126 src++;
127 c = cmdline[src];
128 if (!c) {
129 free(*argv);
130 *argv = NULL;
131 return error("cmdline ends with \\");
132 }
133 }
134 cmdline[dst++] = c;
135 src++;
136 }
137 }
138
139 cmdline[dst] = 0;
140
141 if (quoted) {
142 free(*argv);
143 *argv = NULL;
144 return error("unclosed quote");
145 }
146
147 return count;
148}
149
150static int handle_alias(int *argcp, const char ***argv)
151{
47e5c0ca 152 int nongit = 0, ret = 0, saved_errno = errno;
2b11e317 153 const char *subdir;
0347a8c7
ML
154 int count, option_count;
155 const char** new_argv;
2b11e317
JS
156
157 subdir = setup_git_directory_gently(&nongit);
0347a8c7
ML
158
159 alias_command = (*argv)[0];
160 git_config(git_alias_config);
161 if (alias_string) {
162 count = split_cmdline(alias_string, &new_argv);
163 option_count = handle_options(&new_argv, &count);
164 memmove(new_argv - option_count, new_argv,
165 count * sizeof(char *));
166 new_argv -= option_count;
167
168 if (count < 1)
169 die("empty alias for %s", alias_command);
170
171 if (!strcmp(alias_command, new_argv[0]))
172 die("recursive alias: %s", alias_command);
173
6ce4e61f
CC
174 trace_argv_printf(new_argv, count,
175 "trace: alias expansion: %s =>",
176 alias_command);
575ba9d6 177
83572c1a
JF
178 new_argv = xrealloc(new_argv, sizeof(char*) *
179 (count + *argcp + 1));
0347a8c7
ML
180 /* insert after command name */
181 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
182 new_argv[count+*argcp] = NULL;
2b11e317 183
0347a8c7
ML
184 *argv = new_argv;
185 *argcp += count - 1;
2b11e317 186
0347a8c7 187 ret = 1;
2b11e317
JS
188 }
189
190 if (subdir)
191 chdir(subdir);
192
47e5c0ca
JS
193 errno = saved_errno;
194
2b11e317
JS
195 return ret;
196}
197
70827b15 198const char git_version_string[] = GIT_VERSION;
5b84f4d8 199
efffea03
JH
200#define RUN_SETUP (1<<0)
201#define USE_PAGER (1<<1)
a633fca0 202
9201c707 203static void handle_internal_command(int argc, const char **argv, char **envp)
231af832
LT
204{
205 const char *cmd = argv[0];
206 static struct cmd_struct {
207 const char *cmd;
a633fca0 208 int (*fn)(int, const char **, const char *);
9590b041 209 int option;
231af832 210 } commands[] = {
efffea03 211 { "add", cmd_add, RUN_SETUP },
f789e347 212 { "annotate", cmd_annotate, },
f754fa9c 213 { "apply", cmd_apply },
4df096a5 214 { "archive", cmd_archive },
acca687f 215 { "blame", cmd_blame, RUN_SETUP | USE_PAGER },
1da1b3a3 216 { "branch", cmd_branch, RUN_SETUP },
efffea03
JH
217 { "cat-file", cmd_cat_file, RUN_SETUP },
218 { "checkout-index", cmd_checkout_index, RUN_SETUP },
0864f264 219 { "check-ref-format", cmd_check_ref_format },
e827633a 220 { "cherry", cmd_cherry, RUN_SETUP },
efffea03 221 { "commit-tree", cmd_commit_tree, RUN_SETUP },
8112894d 222 { "count-objects", cmd_count_objects, RUN_SETUP },
e88ee291 223 { "diff", cmd_diff, RUN_SETUP | USE_PAGER },
efffea03
JH
224 { "diff-files", cmd_diff_files, RUN_SETUP },
225 { "diff-index", cmd_diff_index, RUN_SETUP },
226 { "diff-stages", cmd_diff_stages, RUN_SETUP },
227 { "diff-tree", cmd_diff_tree, RUN_SETUP },
228 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
9f613ddd 229 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
efffea03 230 { "format-patch", cmd_format_patch, RUN_SETUP },
f754fa9c 231 { "get-tar-commit-id", cmd_get_tar_commit_id },
efffea03 232 { "grep", cmd_grep, RUN_SETUP },
f754fa9c 233 { "help", cmd_help },
515377ea 234 { "init", cmd_init_db },
f754fa9c 235 { "init-db", cmd_init_db },
efffea03
JH
236 { "log", cmd_log, RUN_SETUP | USE_PAGER },
237 { "ls-files", cmd_ls_files, RUN_SETUP },
238 { "ls-tree", cmd_ls_tree, RUN_SETUP },
f754fa9c
JH
239 { "mailinfo", cmd_mailinfo },
240 { "mailsplit", cmd_mailsplit },
ba1f5f35 241 { "merge-file", cmd_merge_file },
efffea03
JH
242 { "mv", cmd_mv, RUN_SETUP },
243 { "name-rev", cmd_name_rev, RUN_SETUP },
244 { "pack-objects", cmd_pack_objects, RUN_SETUP },
acca687f 245 { "pickaxe", cmd_blame, RUN_SETUP | USE_PAGER },
efffea03
JH
246 { "prune", cmd_prune, RUN_SETUP },
247 { "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085 248 { "push", cmd_push, RUN_SETUP },
efffea03 249 { "read-tree", cmd_read_tree, RUN_SETUP },
4264dc15 250 { "reflog", cmd_reflog, RUN_SETUP },
f754fa9c 251 { "repo-config", cmd_repo_config },
658f3650 252 { "rerere", cmd_rerere, RUN_SETUP },
efffea03
JH
253 { "rev-list", cmd_rev_list, RUN_SETUP },
254 { "rev-parse", cmd_rev_parse, RUN_SETUP },
255 { "rm", cmd_rm, RUN_SETUP },
c91f0d92 256 { "runstatus", cmd_runstatus, RUN_SETUP },
1d541c12 257 { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
efffea03
JH
258 { "show-branch", cmd_show_branch, RUN_SETUP },
259 { "show", cmd_show, RUN_SETUP | USE_PAGER },
f754fa9c 260 { "stripspace", cmd_stripspace },
efffea03 261 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
9cb90b80 262 { "tar-tree", cmd_tar_tree },
efffea03
JH
263 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
264 { "update-index", cmd_update_index, RUN_SETUP },
265 { "update-ref", cmd_update_ref, RUN_SETUP },
39345a21 266 { "upload-archive", cmd_upload_archive },
f754fa9c 267 { "version", cmd_version },
efffea03
JH
268 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
269 { "write-tree", cmd_write_tree, RUN_SETUP },
2e3ed670 270 { "verify-pack", cmd_verify_pack },
358ddb62 271 { "show-ref", cmd_show_ref, RUN_SETUP },
e1e22e37 272 { "pack-refs", cmd_pack_refs, RUN_SETUP },
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;
efffea03 289 if (p->option & RUN_SETUP)
a633fca0 290 prefix = setup_git_directory();
9590b041
JH
291 if (p->option & USE_PAGER)
292 setup_pager();
6ce4e61f 293 trace_argv_printf(argv, argc, "trace: built-in: git");
575ba9d6 294
a633fca0 295 exit(p->fn(argc, argv, prefix));
231af832
LT
296 }
297}
298
9201c707 299int main(int argc, const char **argv, char **envp)
8e49d503 300{
5b6df8e4 301 const char *cmd = argv[0] ? argv[0] : "git-help";
231af832 302 char *slash = strrchr(cmd, '/');
231af832 303 const char *exec_path = NULL;
a025463b 304 int done_alias = 0;
231af832
LT
305
306 /*
307 * Take the basename of argv[0] as the command
308 * name, and the dirname as the default exec_path
309 * if it's an absolute path and we don't have
310 * anything better.
311 */
312 if (slash) {
313 *slash++ = 0;
314 if (*cmd == '/')
315 exec_path = cmd;
316 cmd = slash;
317 }
8e49d503 318
231af832
LT
319 /*
320 * "git-xxxx" is the same as "git xxxx", but we obviously:
321 *
322 * - cannot take flags in between the "git" and the "xxxx".
323 * - cannot execute it externally (since it would just do
324 * the same thing over again)
325 *
326 * So we just directly call the internal command handler, and
327 * die if that one cannot handle it.
328 */
329 if (!strncmp(cmd, "git-", 4)) {
330 cmd += 4;
331 argv[0] = cmd;
332 handle_internal_command(argc, argv, envp);
333 die("cannot handle %s internally", cmd);
334 }
8e49d503 335
231af832 336 /* Look for flags.. */
6acbcb92
JS
337 argv++;
338 argc--;
339 handle_options(&argv, &argc);
340 if (argc > 0) {
341 if (!strncmp(argv[0], "--", 2))
342 argv[0] += 2;
343 } else {
344 /* Default command: "help" */
345 argv[0] = "help";
346 argc = 1;
97fc6c5f 347 }
6acbcb92 348 cmd = argv[0];
231af832
LT
349
350 /*
351 * We search for git commands in the following order:
352 * - git_exec_path()
353 * - the path of the "git" command if we could find it
354 * in $0
355 * - the regular PATH.
356 */
357 if (exec_path)
358 prepend_to_path(exec_path, strlen(exec_path));
77cb17e9
MO
359 exec_path = git_exec_path();
360 prepend_to_path(exec_path, strlen(exec_path));
8e49d503 361
a025463b
JH
362 while (1) {
363 /* See if it's an internal command */
364 handle_internal_command(argc, argv, envp);
2b11e317 365
a025463b
JH
366 /* .. then try the external ones */
367 execv_git_cmd(argv);
231af832 368
a025463b
JH
369 /* It could be an alias -- this works around the insanity
370 * of overriding "git log" with "git show" by having
371 * alias.log = show
372 */
373 if (done_alias || !handle_alias(&argc, &argv))
374 break;
375 done_alias = 1;
376 }
10b15b86
AR
377
378 if (errno == ENOENT)
822a7d50 379 help_unknown_cmd(cmd);
10b15b86
AR
380
381 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 382 cmd, strerror(errno));
8e49d503
AE
383
384 return 1;
385}