Add a test for git-rerere
[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
JS
61 } else if (!strcmp(cmd, "--git-dir")) {
62 if (*argc < 1)
63 return -1;
64 setenv("GIT_DIR", (*argv)[1], 1);
65 (*argv)++;
66 (*argc)--;
67 } else if (!strncmp(cmd, "--git-dir=", 10)) {
68 setenv("GIT_DIR", cmd + 10, 1);
69 } else if (!strcmp(cmd, "--bare")) {
70 static char git_dir[1024];
71 setenv("GIT_DIR", getcwd(git_dir, 1024), 1);
72 } else {
73 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 74 usage(git_usage_string);
6acbcb92 75 }
4ab243a9
JS
76
77 (*argv)++;
78 (*argc)--;
79 handled++;
80 }
81 return handled;
82}
83
2b11e317 84static const char *alias_command;
96f1e58f 85static char *alias_string;
2b11e317
JS
86
87static int git_alias_config(const char *var, const char *value)
88{
89 if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
9befac47 90 alias_string = xstrdup(value);
2b11e317
JS
91 }
92 return 0;
93}
94
95static int split_cmdline(char *cmdline, const char ***argv)
96{
97 int src, dst, count = 0, size = 16;
98 char quoted = 0;
99
100 *argv = malloc(sizeof(char*) * size);
101
102 /* split alias_string */
103 (*argv)[count++] = cmdline;
104 for (src = dst = 0; cmdline[src];) {
105 char c = cmdline[src];
106 if (!quoted && isspace(c)) {
107 cmdline[dst++] = 0;
108 while (cmdline[++src]
109 && isspace(cmdline[src]))
110 ; /* skip */
111 if (count >= size) {
112 size += 16;
83572c1a 113 *argv = xrealloc(*argv, sizeof(char*) * size);
2b11e317
JS
114 }
115 (*argv)[count++] = cmdline + dst;
116 } else if(!quoted && (c == '\'' || c == '"')) {
117 quoted = c;
118 src++;
119 } else if (c == quoted) {
120 quoted = 0;
121 src++;
122 } else {
123 if (c == '\\' && quoted != '\'') {
124 src++;
125 c = cmdline[src];
126 if (!c) {
127 free(*argv);
128 *argv = NULL;
129 return error("cmdline ends with \\");
130 }
131 }
132 cmdline[dst++] = c;
133 src++;
134 }
135 }
136
137 cmdline[dst] = 0;
138
139 if (quoted) {
140 free(*argv);
141 *argv = NULL;
142 return error("unclosed quote");
143 }
144
145 return count;
146}
147
148static int handle_alias(int *argcp, const char ***argv)
149{
47e5c0ca 150 int nongit = 0, ret = 0, saved_errno = errno;
2b11e317 151 const char *subdir;
0347a8c7
ML
152 int count, option_count;
153 const char** new_argv;
2b11e317
JS
154
155 subdir = setup_git_directory_gently(&nongit);
0347a8c7
ML
156
157 alias_command = (*argv)[0];
158 git_config(git_alias_config);
159 if (alias_string) {
160 count = split_cmdline(alias_string, &new_argv);
161 option_count = handle_options(&new_argv, &count);
162 memmove(new_argv - option_count, new_argv,
163 count * sizeof(char *));
164 new_argv -= option_count;
165
166 if (count < 1)
167 die("empty alias for %s", alias_command);
168
169 if (!strcmp(alias_command, new_argv[0]))
170 die("recursive alias: %s", alias_command);
171
6ce4e61f
CC
172 trace_argv_printf(new_argv, count,
173 "trace: alias expansion: %s =>",
174 alias_command);
575ba9d6 175
83572c1a
JF
176 new_argv = xrealloc(new_argv, sizeof(char*) *
177 (count + *argcp + 1));
0347a8c7
ML
178 /* insert after command name */
179 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
180 new_argv[count+*argcp] = NULL;
2b11e317 181
0347a8c7
ML
182 *argv = new_argv;
183 *argcp += count - 1;
2b11e317 184
0347a8c7 185 ret = 1;
2b11e317
JS
186 }
187
188 if (subdir)
189 chdir(subdir);
190
47e5c0ca
JS
191 errno = saved_errno;
192
2b11e317
JS
193 return ret;
194}
195
70827b15 196const char git_version_string[] = GIT_VERSION;
5b84f4d8 197
efffea03
JH
198#define RUN_SETUP (1<<0)
199#define USE_PAGER (1<<1)
a633fca0 200
9201c707 201static void handle_internal_command(int argc, const char **argv, char **envp)
231af832
LT
202{
203 const char *cmd = argv[0];
204 static struct cmd_struct {
205 const char *cmd;
a633fca0 206 int (*fn)(int, const char **, const char *);
9590b041 207 int option;
231af832 208 } commands[] = {
efffea03 209 { "add", cmd_add, RUN_SETUP },
f789e347 210 { "annotate", cmd_annotate, },
f754fa9c 211 { "apply", cmd_apply },
4df096a5 212 { "archive", cmd_archive },
acca687f 213 { "blame", cmd_blame, RUN_SETUP | USE_PAGER },
1da1b3a3 214 { "branch", cmd_branch, RUN_SETUP },
efffea03
JH
215 { "cat-file", cmd_cat_file, RUN_SETUP },
216 { "checkout-index", cmd_checkout_index, RUN_SETUP },
0864f264 217 { "check-ref-format", cmd_check_ref_format },
e827633a 218 { "cherry", cmd_cherry, RUN_SETUP },
efffea03 219 { "commit-tree", cmd_commit_tree, RUN_SETUP },
8112894d 220 { "count-objects", cmd_count_objects, RUN_SETUP },
e88ee291 221 { "diff", cmd_diff, RUN_SETUP | USE_PAGER },
efffea03
JH
222 { "diff-files", cmd_diff_files, RUN_SETUP },
223 { "diff-index", cmd_diff_index, RUN_SETUP },
224 { "diff-stages", cmd_diff_stages, RUN_SETUP },
225 { "diff-tree", cmd_diff_tree, RUN_SETUP },
226 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
9f613ddd 227 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
efffea03 228 { "format-patch", cmd_format_patch, RUN_SETUP },
f754fa9c 229 { "get-tar-commit-id", cmd_get_tar_commit_id },
efffea03 230 { "grep", cmd_grep, RUN_SETUP },
f754fa9c
JH
231 { "help", cmd_help },
232 { "init-db", cmd_init_db },
efffea03
JH
233 { "log", cmd_log, RUN_SETUP | USE_PAGER },
234 { "ls-files", cmd_ls_files, RUN_SETUP },
235 { "ls-tree", cmd_ls_tree, RUN_SETUP },
f754fa9c
JH
236 { "mailinfo", cmd_mailinfo },
237 { "mailsplit", cmd_mailsplit },
ba1f5f35 238 { "merge-file", cmd_merge_file },
efffea03
JH
239 { "mv", cmd_mv, RUN_SETUP },
240 { "name-rev", cmd_name_rev, RUN_SETUP },
241 { "pack-objects", cmd_pack_objects, RUN_SETUP },
acca687f 242 { "pickaxe", cmd_blame, RUN_SETUP | USE_PAGER },
efffea03
JH
243 { "prune", cmd_prune, RUN_SETUP },
244 { "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085 245 { "push", cmd_push, RUN_SETUP },
efffea03 246 { "read-tree", cmd_read_tree, RUN_SETUP },
f754fa9c 247 { "repo-config", cmd_repo_config },
efffea03
JH
248 { "rev-list", cmd_rev_list, RUN_SETUP },
249 { "rev-parse", cmd_rev_parse, RUN_SETUP },
250 { "rm", cmd_rm, RUN_SETUP },
c91f0d92 251 { "runstatus", cmd_runstatus, RUN_SETUP },
1d541c12 252 { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
efffea03
JH
253 { "show-branch", cmd_show_branch, RUN_SETUP },
254 { "show", cmd_show, RUN_SETUP | USE_PAGER },
f754fa9c 255 { "stripspace", cmd_stripspace },
efffea03 256 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
9cb90b80 257 { "tar-tree", cmd_tar_tree },
efffea03
JH
258 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
259 { "update-index", cmd_update_index, RUN_SETUP },
260 { "update-ref", cmd_update_ref, RUN_SETUP },
39345a21 261 { "upload-archive", cmd_upload_archive },
f754fa9c 262 { "version", cmd_version },
efffea03
JH
263 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
264 { "write-tree", cmd_write_tree, RUN_SETUP },
2e3ed670 265 { "verify-pack", cmd_verify_pack },
358ddb62 266 { "show-ref", cmd_show_ref, RUN_SETUP },
e1e22e37 267 { "pack-refs", cmd_pack_refs, RUN_SETUP },
231af832
LT
268 };
269 int i;
270
1cd95087
LT
271 /* Turn "git cmd --help" into "git help cmd" */
272 if (argc > 1 && !strcmp(argv[1], "--help")) {
273 argv[1] = argv[0];
274 argv[0] = cmd = "help";
275 }
276
231af832
LT
277 for (i = 0; i < ARRAY_SIZE(commands); i++) {
278 struct cmd_struct *p = commands+i;
a633fca0 279 const char *prefix;
231af832
LT
280 if (strcmp(p->cmd, cmd))
281 continue;
575ba9d6 282
a633fca0 283 prefix = NULL;
efffea03 284 if (p->option & RUN_SETUP)
a633fca0 285 prefix = setup_git_directory();
9590b041
JH
286 if (p->option & USE_PAGER)
287 setup_pager();
6ce4e61f 288 trace_argv_printf(argv, argc, "trace: built-in: git");
575ba9d6 289
a633fca0 290 exit(p->fn(argc, argv, prefix));
231af832
LT
291 }
292}
293
9201c707 294int main(int argc, const char **argv, char **envp)
8e49d503 295{
5b6df8e4 296 const char *cmd = argv[0] ? argv[0] : "git-help";
231af832 297 char *slash = strrchr(cmd, '/');
231af832 298 const char *exec_path = NULL;
a025463b 299 int done_alias = 0;
231af832
LT
300
301 /*
302 * Take the basename of argv[0] as the command
303 * name, and the dirname as the default exec_path
304 * if it's an absolute path and we don't have
305 * anything better.
306 */
307 if (slash) {
308 *slash++ = 0;
309 if (*cmd == '/')
310 exec_path = cmd;
311 cmd = slash;
312 }
8e49d503 313
231af832
LT
314 /*
315 * "git-xxxx" is the same as "git xxxx", but we obviously:
316 *
317 * - cannot take flags in between the "git" and the "xxxx".
318 * - cannot execute it externally (since it would just do
319 * the same thing over again)
320 *
321 * So we just directly call the internal command handler, and
322 * die if that one cannot handle it.
323 */
324 if (!strncmp(cmd, "git-", 4)) {
325 cmd += 4;
326 argv[0] = cmd;
327 handle_internal_command(argc, argv, envp);
328 die("cannot handle %s internally", cmd);
329 }
8e49d503 330
231af832 331 /* Look for flags.. */
6acbcb92
JS
332 argv++;
333 argc--;
334 handle_options(&argv, &argc);
335 if (argc > 0) {
336 if (!strncmp(argv[0], "--", 2))
337 argv[0] += 2;
338 } else {
339 /* Default command: "help" */
340 argv[0] = "help";
341 argc = 1;
97fc6c5f 342 }
6acbcb92 343 cmd = argv[0];
231af832
LT
344
345 /*
346 * We search for git commands in the following order:
347 * - git_exec_path()
348 * - the path of the "git" command if we could find it
349 * in $0
350 * - the regular PATH.
351 */
352 if (exec_path)
353 prepend_to_path(exec_path, strlen(exec_path));
77cb17e9
MO
354 exec_path = git_exec_path();
355 prepend_to_path(exec_path, strlen(exec_path));
8e49d503 356
a025463b
JH
357 while (1) {
358 /* See if it's an internal command */
359 handle_internal_command(argc, argv, envp);
2b11e317 360
a025463b
JH
361 /* .. then try the external ones */
362 execv_git_cmd(argv);
231af832 363
a025463b
JH
364 /* It could be an alias -- this works around the insanity
365 * of overriding "git log" with "git show" by having
366 * alias.log = show
367 */
368 if (done_alias || !handle_alias(&argc, &argv))
369 break;
370 done_alias = 1;
371 }
10b15b86
AR
372
373 if (errno == ENOENT)
822a7d50 374 help_unknown_cmd(cmd);
10b15b86
AR
375
376 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 377 cmd, strerror(errno));
8e49d503
AE
378
379 return 1;
380}