setup_git_directory_gently: do not barf when GIT_DIR is given.
[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
AE
17
18static void prepend_to_path(const char *dir, int len)
19{
554fe20d
TH
20 const char *old_path = getenv("PATH");
21 char *path;
8e49d503
AE
22 int path_len = len;
23
24 if (!old_path)
7dbc2c04 25 old_path = "/usr/local/bin:/usr/bin:/bin";
8e49d503
AE
26
27 path_len = len + strlen(old_path) + 1;
28
29 path = malloc(path_len + 1);
8e49d503
AE
30
31 memcpy(path, dir, len);
32 path[len] = ':';
33 memcpy(path + len + 1, old_path, path_len - len);
34
35 setenv("PATH", path, 1);
36}
37
4ab243a9
JS
38static int handle_options(const char*** argv, int* argc)
39{
40 int handled = 0;
41
42 while (*argc > 0) {
43 const char *cmd = (*argv)[0];
44 if (cmd[0] != '-')
45 break;
46
6acbcb92
JS
47 /*
48 * For legacy reasons, the "version" and "help"
49 * commands can be written with "--" prepended
50 * to make them look like flags.
51 */
52 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
53 break;
54
55 /*
56 * Check remaining flags.
57 */
58 if (!strncmp(cmd, "--exec-path", 11)) {
59 cmd += 11;
60 if (*cmd == '=')
61 git_set_exec_path(cmd + 1);
62 else {
63 puts(git_exec_path());
64 exit(0);
65 }
66 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
4ab243a9 67 setup_pager();
6acbcb92
JS
68 } else if (!strcmp(cmd, "--git-dir")) {
69 if (*argc < 1)
70 return -1;
71 setenv("GIT_DIR", (*argv)[1], 1);
72 (*argv)++;
73 (*argc)--;
74 } else if (!strncmp(cmd, "--git-dir=", 10)) {
75 setenv("GIT_DIR", cmd + 10, 1);
76 } else if (!strcmp(cmd, "--bare")) {
77 static char git_dir[1024];
78 setenv("GIT_DIR", getcwd(git_dir, 1024), 1);
79 } else {
80 fprintf(stderr, "Unknown option: %s\n", cmd);
81 cmd_usage(0, NULL, NULL);
82 }
4ab243a9
JS
83
84 (*argv)++;
85 (*argc)--;
86 handled++;
87 }
88 return handled;
89}
90
2b11e317
JS
91static const char *alias_command;
92static char *alias_string = NULL;
93
94static int git_alias_config(const char *var, const char *value)
95{
96 if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
97 alias_string = strdup(value);
98 }
99 return 0;
100}
101
102static int split_cmdline(char *cmdline, const char ***argv)
103{
104 int src, dst, count = 0, size = 16;
105 char quoted = 0;
106
107 *argv = malloc(sizeof(char*) * size);
108
109 /* split alias_string */
110 (*argv)[count++] = cmdline;
111 for (src = dst = 0; cmdline[src];) {
112 char c = cmdline[src];
113 if (!quoted && isspace(c)) {
114 cmdline[dst++] = 0;
115 while (cmdline[++src]
116 && isspace(cmdline[src]))
117 ; /* skip */
118 if (count >= size) {
119 size += 16;
120 *argv = realloc(*argv, sizeof(char*) * size);
121 }
122 (*argv)[count++] = cmdline + dst;
123 } else if(!quoted && (c == '\'' || c == '"')) {
124 quoted = c;
125 src++;
126 } else if (c == quoted) {
127 quoted = 0;
128 src++;
129 } else {
130 if (c == '\\' && quoted != '\'') {
131 src++;
132 c = cmdline[src];
133 if (!c) {
134 free(*argv);
135 *argv = NULL;
136 return error("cmdline ends with \\");
137 }
138 }
139 cmdline[dst++] = c;
140 src++;
141 }
142 }
143
144 cmdline[dst] = 0;
145
146 if (quoted) {
147 free(*argv);
148 *argv = NULL;
149 return error("unclosed quote");
150 }
151
152 return count;
153}
154
155static int handle_alias(int *argcp, const char ***argv)
156{
47e5c0ca 157 int nongit = 0, ret = 0, saved_errno = errno;
2b11e317
JS
158 const char *subdir;
159
160 subdir = setup_git_directory_gently(&nongit);
161 if (!nongit) {
4ab243a9 162 int count, option_count;
2b11e317
JS
163 const char** new_argv;
164
165 alias_command = (*argv)[0];
166 git_config(git_alias_config);
167 if (alias_string) {
168
169 count = split_cmdline(alias_string, &new_argv);
4ab243a9
JS
170 option_count = handle_options(&new_argv, &count);
171 memmove(new_argv - option_count, new_argv,
172 count * sizeof(char *));
173 new_argv -= option_count;
2b11e317
JS
174
175 if (count < 1)
176 die("empty alias for %s", alias_command);
177
178 if (!strcmp(alias_command, new_argv[0]))
179 die("recursive alias: %s", alias_command);
180
575ba9d6
ML
181 if (getenv("GIT_TRACE")) {
182 int i;
183 fprintf(stderr, "trace: alias expansion: %s =>",
184 alias_command);
185 for (i = 0; i < count; ++i) {
186 fputc(' ', stderr);
187 sq_quote_print(stderr, new_argv[i]);
188 }
189 fputc('\n', stderr);
190 fflush(stderr);
191 }
192
d5b9e6cf
ML
193 new_argv = realloc(new_argv, sizeof(char*) *
194 (count + *argcp + 1));
2b11e317 195 /* insert after command name */
d5b9e6cf
ML
196 memcpy(new_argv + count, *argv + 1,
197 sizeof(char*) * *argcp);
198 new_argv[count+*argcp] = NULL;
2b11e317
JS
199
200 *argv = new_argv;
201 *argcp += count - 1;
202
203 ret = 1;
204 }
205 }
206
207 if (subdir)
208 chdir(subdir);
209
47e5c0ca
JS
210 errno = saved_errno;
211
2b11e317
JS
212 return ret;
213}
214
70827b15 215const char git_version_string[] = GIT_VERSION;
5b84f4d8 216
a633fca0
LT
217#define NEEDS_PREFIX 1
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
LT
224 int (*fn)(int, const char **, const char *);
225 int prefix;
231af832
LT
226 } commands[] = {
227 { "version", cmd_version },
228 { "help", cmd_help },
a633fca0
LT
229 { "log", cmd_log, NEEDS_PREFIX },
230 { "whatchanged", cmd_whatchanged, NEEDS_PREFIX },
231 { "show", cmd_show, NEEDS_PREFIX },
755225de 232 { "push", cmd_push },
a633fca0 233 { "format-patch", cmd_format_patch, NEEDS_PREFIX },
c7432087 234 { "count-objects", cmd_count_objects },
a633fca0
LT
235 { "diff", cmd_diff, NEEDS_PREFIX },
236 { "grep", cmd_grep, NEEDS_PREFIX },
237 { "rm", cmd_rm, NEEDS_PREFIX },
238 { "add", cmd_add, NEEDS_PREFIX },
239 { "rev-list", cmd_rev_list, NEEDS_PREFIX },
c3c8835f 240 { "init-db", cmd_init_db },
52ba03cb 241 { "get-tar-commit-id", cmd_get_tar_commit_id },
21754264 242 { "upload-tar", cmd_upload_tar },
0864f264 243 { "check-ref-format", cmd_check_ref_format },
a633fca0
LT
244 { "ls-files", cmd_ls_files, NEEDS_PREFIX },
245 { "ls-tree", cmd_ls_tree, NEEDS_PREFIX },
246 { "tar-tree", cmd_tar_tree, NEEDS_PREFIX },
247 { "read-tree", cmd_read_tree, NEEDS_PREFIX },
248 { "commit-tree", cmd_commit_tree, NEEDS_PREFIX },
51ce34b9 249 { "apply", cmd_apply },
a633fca0
LT
250 { "show-branch", cmd_show_branch, NEEDS_PREFIX },
251 { "diff-files", cmd_diff_files, NEEDS_PREFIX },
252 { "diff-index", cmd_diff_index, NEEDS_PREFIX },
253 { "diff-stages", cmd_diff_stages, NEEDS_PREFIX },
254 { "diff-tree", cmd_diff_tree, NEEDS_PREFIX },
255 { "cat-file", cmd_cat_file, NEEDS_PREFIX },
256 { "rev-parse", cmd_rev_parse, NEEDS_PREFIX },
257 { "write-tree", cmd_write_tree, NEEDS_PREFIX },
34488e3c 258 { "mailsplit", cmd_mailsplit },
7499c996 259 { "mailinfo", cmd_mailinfo },
fefe81c9 260 { "stripspace", cmd_stripspace },
a633fca0
LT
261 { "update-index", cmd_update_index, NEEDS_PREFIX },
262 { "update-ref", cmd_update_ref, NEEDS_PREFIX },
263 { "fmt-merge-msg", cmd_fmt_merge_msg, NEEDS_PREFIX },
264 { "prune", cmd_prune, NEEDS_PREFIX },
7061cf0f 265 { "mv", cmd_mv, NEEDS_PREFIX },
231af832
LT
266 };
267 int i;
268
1cd95087
LT
269 /* Turn "git cmd --help" into "git help cmd" */
270 if (argc > 1 && !strcmp(argv[1], "--help")) {
271 argv[1] = argv[0];
272 argv[0] = cmd = "help";
273 }
274
231af832
LT
275 for (i = 0; i < ARRAY_SIZE(commands); i++) {
276 struct cmd_struct *p = commands+i;
a633fca0 277 const char *prefix;
231af832
LT
278 if (strcmp(p->cmd, cmd))
279 continue;
575ba9d6 280
a633fca0
LT
281 prefix = NULL;
282 if (p->prefix)
283 prefix = setup_git_directory();
575ba9d6
ML
284 if (getenv("GIT_TRACE")) {
285 int i;
286 fprintf(stderr, "trace: built-in: git");
287 for (i = 0; i < argc; ++i) {
288 fputc(' ', stderr);
289 sq_quote_print(stderr, argv[i]);
290 }
291 putc('\n', stderr);
292 fflush(stderr);
293 }
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{
9201c707 301 const char *cmd = argv[0];
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)
a87cd02c 379 cmd_usage(0, exec_path, "'%s' is not a git-command", 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}