Merge branch 'db/diff-to-fp'
[git] / git.c
1 #include "builtin.h"
2 #include "exec_cmd.h"
3 #include "cache.h"
4 #include "quote.h"
5
6 const char git_usage_string[] =
7         "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
8
9 static int handle_options(const char*** argv, int* argc, int* envchanged)
10 {
11         int handled = 0;
12
13         while (*argc > 0) {
14                 const char *cmd = (*argv)[0];
15                 if (cmd[0] != '-')
16                         break;
17
18                 /*
19                  * For legacy reasons, the "version" and "help"
20                  * commands can be written with "--" prepended
21                  * to make them look like flags.
22                  */
23                 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
24                         break;
25
26                 /*
27                  * Check remaining flags.
28                  */
29                 if (!prefixcmp(cmd, "--exec-path")) {
30                         cmd += 11;
31                         if (*cmd == '=')
32                                 git_set_argv_exec_path(cmd + 1);
33                         else {
34                                 puts(git_exec_path());
35                                 exit(0);
36                         }
37                 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
38                         setup_pager();
39                 } else if (!strcmp(cmd, "--no-pager")) {
40                         setenv("GIT_PAGER", "cat", 1);
41                         if (envchanged)
42                                 *envchanged = 1;
43                 } else if (!strcmp(cmd, "--git-dir")) {
44                         if (*argc < 2) {
45                                 fprintf(stderr, "No directory given for --git-dir.\n" );
46                                 usage(git_usage_string);
47                         }
48                         setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
49                         if (envchanged)
50                                 *envchanged = 1;
51                         (*argv)++;
52                         (*argc)--;
53                         handled++;
54                 } else if (!prefixcmp(cmd, "--git-dir=")) {
55                         setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
56                         if (envchanged)
57                                 *envchanged = 1;
58                 } else if (!strcmp(cmd, "--work-tree")) {
59                         if (*argc < 2) {
60                                 fprintf(stderr, "No directory given for --work-tree.\n" );
61                                 usage(git_usage_string);
62                         }
63                         setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
64                         if (envchanged)
65                                 *envchanged = 1;
66                         (*argv)++;
67                         (*argc)--;
68                 } else if (!prefixcmp(cmd, "--work-tree=")) {
69                         setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
70                         if (envchanged)
71                                 *envchanged = 1;
72                 } else if (!strcmp(cmd, "--bare")) {
73                         static char git_dir[PATH_MAX+1];
74                         is_bare_repository_cfg = 1;
75                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
76                         if (envchanged)
77                                 *envchanged = 1;
78                 } else {
79                         fprintf(stderr, "Unknown option: %s\n", cmd);
80                         usage(git_usage_string);
81                 }
82
83                 (*argv)++;
84                 (*argc)--;
85                 handled++;
86         }
87         return handled;
88 }
89
90 static int split_cmdline(char *cmdline, const char ***argv)
91 {
92         int src, dst, count = 0, size = 16;
93         char quoted = 0;
94
95         *argv = xmalloc(sizeof(char*) * size);
96
97         /* split alias_string */
98         (*argv)[count++] = cmdline;
99         for (src = dst = 0; cmdline[src];) {
100                 char c = cmdline[src];
101                 if (!quoted && isspace(c)) {
102                         cmdline[dst++] = 0;
103                         while (cmdline[++src]
104                                         && isspace(cmdline[src]))
105                                 ; /* skip */
106                         if (count >= size) {
107                                 size += 16;
108                                 *argv = xrealloc(*argv, sizeof(char*) * size);
109                         }
110                         (*argv)[count++] = cmdline + dst;
111                 } else if(!quoted && (c == '\'' || c == '"')) {
112                         quoted = c;
113                         src++;
114                 } else if (c == quoted) {
115                         quoted = 0;
116                         src++;
117                 } else {
118                         if (c == '\\' && quoted != '\'') {
119                                 src++;
120                                 c = cmdline[src];
121                                 if (!c) {
122                                         free(*argv);
123                                         *argv = NULL;
124                                         return error("cmdline ends with \\");
125                                 }
126                         }
127                         cmdline[dst++] = c;
128                         src++;
129                 }
130         }
131
132         cmdline[dst] = 0;
133
134         if (quoted) {
135                 free(*argv);
136                 *argv = NULL;
137                 return error("unclosed quote");
138         }
139
140         return count;
141 }
142
143 static int handle_alias(int *argcp, const char ***argv)
144 {
145         int nongit = 0, envchanged = 0, ret = 0, saved_errno = errno;
146         const char *subdir;
147         int count, option_count;
148         const char** new_argv;
149         const char *alias_command;
150         char *alias_string;
151
152         subdir = setup_git_directory_gently(&nongit);
153
154         alias_command = (*argv)[0];
155         alias_string = alias_lookup(alias_command);
156         if (alias_string) {
157                 if (alias_string[0] == '!') {
158                         if (*argcp > 1) {
159                                 struct strbuf buf;
160
161                                 strbuf_init(&buf, PATH_MAX);
162                                 strbuf_addstr(&buf, alias_string);
163                                 sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
164                                 free(alias_string);
165                                 alias_string = buf.buf;
166                         }
167                         trace_printf("trace: alias to shell cmd: %s => %s\n",
168                                      alias_command, alias_string + 1);
169                         ret = system(alias_string + 1);
170                         if (ret >= 0 && WIFEXITED(ret) &&
171                             WEXITSTATUS(ret) != 127)
172                                 exit(WEXITSTATUS(ret));
173                         die("Failed to run '%s' when expanding alias '%s'\n",
174                             alias_string + 1, alias_command);
175                 }
176                 count = split_cmdline(alias_string, &new_argv);
177                 option_count = handle_options(&new_argv, &count, &envchanged);
178                 if (envchanged)
179                         die("alias '%s' changes environment variables\n"
180                                  "You can use '!git' in the alias to do this.",
181                                  alias_command);
182                 memmove(new_argv - option_count, new_argv,
183                                 count * sizeof(char *));
184                 new_argv -= option_count;
185
186                 if (count < 1)
187                         die("empty alias for %s", alias_command);
188
189                 if (!strcmp(alias_command, new_argv[0]))
190                         die("recursive alias: %s", alias_command);
191
192                 trace_argv_printf(new_argv,
193                                   "trace: alias expansion: %s =>",
194                                   alias_command);
195
196                 new_argv = xrealloc(new_argv, sizeof(char*) *
197                                     (count + *argcp + 1));
198                 /* insert after command name */
199                 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
200                 new_argv[count+*argcp] = NULL;
201
202                 *argv = new_argv;
203                 *argcp += count - 1;
204
205                 ret = 1;
206         }
207
208         if (subdir)
209                 chdir(subdir);
210
211         errno = saved_errno;
212
213         return ret;
214 }
215
216 const char git_version_string[] = GIT_VERSION;
217
218 #define RUN_SETUP       (1<<0)
219 #define USE_PAGER       (1<<1)
220 /*
221  * require working tree to be present -- anything uses this needs
222  * RUN_SETUP for reading from the configuration file.
223  */
224 #define NEED_WORK_TREE  (1<<2)
225
226 struct cmd_struct {
227         const char *cmd;
228         int (*fn)(int, const char **, const char *);
229         int option;
230 };
231
232 static int run_command(struct cmd_struct *p, int argc, const char **argv)
233 {
234         int status;
235         struct stat st;
236         const char *prefix;
237
238         prefix = NULL;
239         if (p->option & RUN_SETUP)
240                 prefix = setup_git_directory();
241         if (p->option & USE_PAGER)
242                 setup_pager();
243         if (p->option & NEED_WORK_TREE)
244                 setup_work_tree();
245
246         trace_argv_printf(argv, "trace: built-in: git");
247
248         status = p->fn(argc, argv, prefix);
249         if (status)
250                 return status & 0xff;
251
252         /* Somebody closed stdout? */
253         if (fstat(fileno(stdout), &st))
254                 return 0;
255         /* Ignore write errors for pipes and sockets.. */
256         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
257                 return 0;
258
259         /* Check for ENOSPC and EIO errors.. */
260         if (fflush(stdout))
261                 die("write failure on standard output: %s", strerror(errno));
262         if (ferror(stdout))
263                 die("unknown write failure on standard output");
264         if (fclose(stdout))
265                 die("close failed on standard output: %s", strerror(errno));
266         return 0;
267 }
268
269 static void handle_internal_command(int argc, const char **argv)
270 {
271         const char *cmd = argv[0];
272         static struct cmd_struct commands[] = {
273                 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
274                 { "annotate", cmd_annotate, RUN_SETUP },
275                 { "apply", cmd_apply },
276                 { "archive", cmd_archive },
277                 { "blame", cmd_blame, RUN_SETUP },
278                 { "branch", cmd_branch, RUN_SETUP },
279                 { "bundle", cmd_bundle },
280                 { "cat-file", cmd_cat_file, RUN_SETUP },
281                 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
282                 { "checkout-index", cmd_checkout_index,
283                         RUN_SETUP | NEED_WORK_TREE},
284                 { "check-ref-format", cmd_check_ref_format },
285                 { "check-attr", cmd_check_attr, RUN_SETUP | NEED_WORK_TREE },
286                 { "cherry", cmd_cherry, RUN_SETUP },
287                 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
288                 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
289                 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
290                 { "commit-tree", cmd_commit_tree, RUN_SETUP },
291                 { "config", cmd_config },
292                 { "count-objects", cmd_count_objects, RUN_SETUP },
293                 { "describe", cmd_describe, RUN_SETUP },
294                 { "diff", cmd_diff },
295                 { "diff-files", cmd_diff_files },
296                 { "diff-index", cmd_diff_index, RUN_SETUP },
297                 { "diff-tree", cmd_diff_tree, RUN_SETUP },
298                 { "fast-export", cmd_fast_export, RUN_SETUP },
299                 { "fetch", cmd_fetch, RUN_SETUP },
300                 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
301                 { "fetch--tool", cmd_fetch__tool, RUN_SETUP },
302                 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
303                 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
304                 { "format-patch", cmd_format_patch, RUN_SETUP },
305                 { "fsck", cmd_fsck, RUN_SETUP },
306                 { "fsck-objects", cmd_fsck, RUN_SETUP },
307                 { "gc", cmd_gc, RUN_SETUP },
308                 { "get-tar-commit-id", cmd_get_tar_commit_id },
309                 { "grep", cmd_grep, RUN_SETUP | USE_PAGER },
310                 { "help", cmd_help },
311 #ifndef NO_CURL
312                 { "http-fetch", cmd_http_fetch, RUN_SETUP },
313 #endif
314                 { "init", cmd_init_db },
315                 { "init-db", cmd_init_db },
316                 { "log", cmd_log, RUN_SETUP | USE_PAGER },
317                 { "ls-files", cmd_ls_files, RUN_SETUP },
318                 { "ls-tree", cmd_ls_tree, RUN_SETUP },
319                 { "ls-remote", cmd_ls_remote },
320                 { "mailinfo", cmd_mailinfo },
321                 { "mailsplit", cmd_mailsplit },
322                 { "merge-base", cmd_merge_base, RUN_SETUP },
323                 { "merge-file", cmd_merge_file },
324                 { "merge-ours", cmd_merge_ours, RUN_SETUP },
325                 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
326                 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
327                 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
328                 { "name-rev", cmd_name_rev, RUN_SETUP },
329                 { "pack-objects", cmd_pack_objects, RUN_SETUP },
330                 { "peek-remote", cmd_ls_remote },
331                 { "pickaxe", cmd_blame, RUN_SETUP },
332                 { "prune", cmd_prune, RUN_SETUP },
333                 { "prune-packed", cmd_prune_packed, RUN_SETUP },
334                 { "push", cmd_push, RUN_SETUP },
335                 { "read-tree", cmd_read_tree, RUN_SETUP },
336                 { "reflog", cmd_reflog, RUN_SETUP },
337                 { "remote", cmd_remote, RUN_SETUP },
338                 { "repo-config", cmd_config },
339                 { "rerere", cmd_rerere, RUN_SETUP },
340                 { "reset", cmd_reset, RUN_SETUP },
341                 { "rev-list", cmd_rev_list, RUN_SETUP },
342                 { "rev-parse", cmd_rev_parse },
343                 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
344                 { "rm", cmd_rm, RUN_SETUP },
345                 { "send-pack", cmd_send_pack, RUN_SETUP },
346                 { "shortlog", cmd_shortlog, USE_PAGER },
347                 { "show-branch", cmd_show_branch, RUN_SETUP },
348                 { "show", cmd_show, RUN_SETUP | USE_PAGER },
349                 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
350                 { "stripspace", cmd_stripspace },
351                 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
352                 { "tag", cmd_tag, RUN_SETUP },
353                 { "tar-tree", cmd_tar_tree },
354                 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
355                 { "update-index", cmd_update_index, RUN_SETUP },
356                 { "update-ref", cmd_update_ref, RUN_SETUP },
357                 { "upload-archive", cmd_upload_archive },
358                 { "verify-tag", cmd_verify_tag, RUN_SETUP },
359                 { "version", cmd_version },
360                 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
361                 { "write-tree", cmd_write_tree, RUN_SETUP },
362                 { "verify-pack", cmd_verify_pack },
363                 { "show-ref", cmd_show_ref, RUN_SETUP },
364                 { "pack-refs", cmd_pack_refs, RUN_SETUP },
365         };
366         int i;
367
368         /* Turn "git cmd --help" into "git help cmd" */
369         if (argc > 1 && !strcmp(argv[1], "--help")) {
370                 argv[1] = argv[0];
371                 argv[0] = cmd = "help";
372         }
373
374         for (i = 0; i < ARRAY_SIZE(commands); i++) {
375                 struct cmd_struct *p = commands+i;
376                 if (strcmp(p->cmd, cmd))
377                         continue;
378                 exit(run_command(p, argc, argv));
379         }
380 }
381
382 int main(int argc, const char **argv)
383 {
384         const char *cmd = argv[0] ? argv[0] : "git-help";
385         char *slash = strrchr(cmd, '/');
386         const char *cmd_path = NULL;
387         int done_alias = 0;
388
389         /*
390          * Take the basename of argv[0] as the command
391          * name, and the dirname as the default exec_path
392          * if we don't have anything better.
393          */
394         if (slash) {
395                 *slash++ = 0;
396                 cmd_path = cmd;
397                 cmd = slash;
398         }
399
400         /*
401          * "git-xxxx" is the same as "git xxxx", but we obviously:
402          *
403          *  - cannot take flags in between the "git" and the "xxxx".
404          *  - cannot execute it externally (since it would just do
405          *    the same thing over again)
406          *
407          * So we just directly call the internal command handler, and
408          * die if that one cannot handle it.
409          */
410         if (!prefixcmp(cmd, "git-")) {
411                 cmd += 4;
412                 argv[0] = cmd;
413                 handle_internal_command(argc, argv);
414                 die("cannot handle %s internally", cmd);
415         }
416
417         /* Look for flags.. */
418         argv++;
419         argc--;
420         handle_options(&argv, &argc, NULL);
421         if (argc > 0) {
422                 if (!prefixcmp(argv[0], "--"))
423                         argv[0] += 2;
424         } else {
425                 /* The user didn't specify a command; give them help */
426                 printf("usage: %s\n\n", git_usage_string);
427                 list_common_cmds_help();
428                 exit(1);
429         }
430         cmd = argv[0];
431
432         /*
433          * We use PATH to find git commands, but we prepend some higher
434          * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
435          * environment, and the $(gitexecdir) from the Makefile at build
436          * time.
437          */
438         setup_path(cmd_path);
439
440         while (1) {
441                 /* See if it's an internal command */
442                 handle_internal_command(argc, argv);
443
444                 /* .. then try the external ones */
445                 execv_git_cmd(argv);
446
447                 /* It could be an alias -- this works around the insanity
448                  * of overriding "git log" with "git show" by having
449                  * alias.log = show
450                  */
451                 if (done_alias || !handle_alias(&argc, &argv))
452                         break;
453                 done_alias = 1;
454         }
455
456         if (errno == ENOENT) {
457                 if (done_alias) {
458                         fprintf(stderr, "Expansion of alias '%s' failed; "
459                                 "'%s' is not a git-command\n",
460                                 cmd, argv[0]);
461                         exit(1);
462                 }
463                 help_unknown_cmd(cmd);
464         }
465
466         fprintf(stderr, "Failed to run command '%s': %s\n",
467                 cmd, strerror(errno));
468
469         return 1;
470 }