Merge branch 'jc/maint-protect-sh-from-ifs' into maint-1.7.11
[git] / git.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "exec_cmd.h"
4 #include "help.h"
5 #include "quote.h"
6 #include "run-command.h"
7
8 const char git_usage_string[] =
9         "git [--version] [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n"
10         "           [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]\n"
11         "           [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n"
12         "           [-c name=value] [--help]\n"
13         "           <command> [<args>]";
14
15 const char git_more_info_string[] =
16         N_("See 'git help <command>' for more information on a specific command.");
17
18 static struct startup_info git_startup_info;
19 static int use_pager = -1;
20 struct pager_config {
21         const char *cmd;
22         int want;
23         char *value;
24 };
25
26 static int pager_command_config(const char *var, const char *value, void *data)
27 {
28         struct pager_config *c = data;
29         if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd)) {
30                 int b = git_config_maybe_bool(var, value);
31                 if (b >= 0)
32                         c->want = b;
33                 else {
34                         c->want = 1;
35                         c->value = xstrdup(value);
36                 }
37         }
38         return 0;
39 }
40
41 /* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
42 int check_pager_config(const char *cmd)
43 {
44         struct pager_config c;
45         c.cmd = cmd;
46         c.want = -1;
47         c.value = NULL;
48         git_config(pager_command_config, &c);
49         if (c.value)
50                 pager_program = c.value;
51         return c.want;
52 }
53
54 static void commit_pager_choice(void) {
55         switch (use_pager) {
56         case 0:
57                 setenv("GIT_PAGER", "cat", 1);
58                 break;
59         case 1:
60                 setup_pager();
61                 break;
62         default:
63                 break;
64         }
65 }
66
67 static int handle_options(const char ***argv, int *argc, int *envchanged)
68 {
69         const char **orig_argv = *argv;
70
71         while (*argc > 0) {
72                 const char *cmd = (*argv)[0];
73                 if (cmd[0] != '-')
74                         break;
75
76                 /*
77                  * For legacy reasons, the "version" and "help"
78                  * commands can be written with "--" prepended
79                  * to make them look like flags.
80                  */
81                 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
82                         break;
83
84                 /*
85                  * Check remaining flags.
86                  */
87                 if (!prefixcmp(cmd, "--exec-path")) {
88                         cmd += 11;
89                         if (*cmd == '=')
90                                 git_set_argv_exec_path(cmd + 1);
91                         else {
92                                 puts(git_exec_path());
93                                 exit(0);
94                         }
95                 } else if (!strcmp(cmd, "--html-path")) {
96                         puts(system_path(GIT_HTML_PATH));
97                         exit(0);
98                 } else if (!strcmp(cmd, "--man-path")) {
99                         puts(system_path(GIT_MAN_PATH));
100                         exit(0);
101                 } else if (!strcmp(cmd, "--info-path")) {
102                         puts(system_path(GIT_INFO_PATH));
103                         exit(0);
104                 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
105                         use_pager = 1;
106                 } else if (!strcmp(cmd, "--no-pager")) {
107                         use_pager = 0;
108                         if (envchanged)
109                                 *envchanged = 1;
110                 } else if (!strcmp(cmd, "--no-replace-objects")) {
111                         read_replace_refs = 0;
112                         setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1);
113                         if (envchanged)
114                                 *envchanged = 1;
115                 } else if (!strcmp(cmd, "--git-dir")) {
116                         if (*argc < 2) {
117                                 fprintf(stderr, "No directory given for --git-dir.\n" );
118                                 usage(git_usage_string);
119                         }
120                         setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
121                         if (envchanged)
122                                 *envchanged = 1;
123                         (*argv)++;
124                         (*argc)--;
125                 } else if (!prefixcmp(cmd, "--git-dir=")) {
126                         setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
127                         if (envchanged)
128                                 *envchanged = 1;
129                 } else if (!strcmp(cmd, "--namespace")) {
130                         if (*argc < 2) {
131                                 fprintf(stderr, "No namespace given for --namespace.\n" );
132                                 usage(git_usage_string);
133                         }
134                         setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1);
135                         if (envchanged)
136                                 *envchanged = 1;
137                         (*argv)++;
138                         (*argc)--;
139                 } else if (!prefixcmp(cmd, "--namespace=")) {
140                         setenv(GIT_NAMESPACE_ENVIRONMENT, cmd + 12, 1);
141                         if (envchanged)
142                                 *envchanged = 1;
143                 } else if (!strcmp(cmd, "--work-tree")) {
144                         if (*argc < 2) {
145                                 fprintf(stderr, "No directory given for --work-tree.\n" );
146                                 usage(git_usage_string);
147                         }
148                         setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1);
149                         if (envchanged)
150                                 *envchanged = 1;
151                         (*argv)++;
152                         (*argc)--;
153                 } else if (!prefixcmp(cmd, "--work-tree=")) {
154                         setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1);
155                         if (envchanged)
156                                 *envchanged = 1;
157                 } else if (!strcmp(cmd, "--bare")) {
158                         static char git_dir[PATH_MAX+1];
159                         is_bare_repository_cfg = 1;
160                         setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0);
161                         if (envchanged)
162                                 *envchanged = 1;
163                 } else if (!strcmp(cmd, "-c")) {
164                         if (*argc < 2) {
165                                 fprintf(stderr, "-c expects a configuration string\n" );
166                                 usage(git_usage_string);
167                         }
168                         git_config_push_parameter((*argv)[1]);
169                         (*argv)++;
170                         (*argc)--;
171                 } else {
172                         fprintf(stderr, "Unknown option: %s\n", cmd);
173                         usage(git_usage_string);
174                 }
175
176                 (*argv)++;
177                 (*argc)--;
178         }
179         return (*argv) - orig_argv;
180 }
181
182 static int handle_alias(int *argcp, const char ***argv)
183 {
184         int envchanged = 0, ret = 0, saved_errno = errno;
185         const char *subdir;
186         int count, option_count;
187         const char **new_argv;
188         const char *alias_command;
189         char *alias_string;
190         int unused_nongit;
191
192         subdir = setup_git_directory_gently(&unused_nongit);
193
194         alias_command = (*argv)[0];
195         alias_string = alias_lookup(alias_command);
196         if (alias_string) {
197                 if (alias_string[0] == '!') {
198                         const char **alias_argv;
199                         int argc = *argcp, i;
200
201                         commit_pager_choice();
202
203                         /* build alias_argv */
204                         alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1));
205                         alias_argv[0] = alias_string + 1;
206                         for (i = 1; i < argc; ++i)
207                                 alias_argv[i] = (*argv)[i];
208                         alias_argv[argc] = NULL;
209
210                         ret = run_command_v_opt(alias_argv, RUN_USING_SHELL);
211                         if (ret >= 0)   /* normal exit */
212                                 exit(ret);
213
214                         die_errno("While expanding alias '%s': '%s'",
215                             alias_command, alias_string + 1);
216                 }
217                 count = split_cmdline(alias_string, &new_argv);
218                 if (count < 0)
219                         die("Bad alias.%s string: %s", alias_command,
220                             split_cmdline_strerror(count));
221                 option_count = handle_options(&new_argv, &count, &envchanged);
222                 if (envchanged)
223                         die("alias '%s' changes environment variables\n"
224                                  "You can use '!git' in the alias to do this.",
225                                  alias_command);
226                 memmove(new_argv - option_count, new_argv,
227                                 count * sizeof(char *));
228                 new_argv -= option_count;
229
230                 if (count < 1)
231                         die("empty alias for %s", alias_command);
232
233                 if (!strcmp(alias_command, new_argv[0]))
234                         die("recursive alias: %s", alias_command);
235
236                 trace_argv_printf(new_argv,
237                                   "trace: alias expansion: %s =>",
238                                   alias_command);
239
240                 new_argv = xrealloc(new_argv, sizeof(char *) *
241                                     (count + *argcp));
242                 /* insert after command name */
243                 memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp);
244
245                 *argv = new_argv;
246                 *argcp += count - 1;
247
248                 ret = 1;
249         }
250
251         if (subdir && chdir(subdir))
252                 die_errno("Cannot change to '%s'", subdir);
253
254         errno = saved_errno;
255
256         return ret;
257 }
258
259 const char git_version_string[] = GIT_VERSION;
260
261 #define RUN_SETUP               (1<<0)
262 #define RUN_SETUP_GENTLY        (1<<1)
263 #define USE_PAGER               (1<<2)
264 /*
265  * require working tree to be present -- anything uses this needs
266  * RUN_SETUP for reading from the configuration file.
267  */
268 #define NEED_WORK_TREE          (1<<3)
269
270 struct cmd_struct {
271         const char *cmd;
272         int (*fn)(int, const char **, const char *);
273         int option;
274 };
275
276 static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
277 {
278         int status, help;
279         struct stat st;
280         const char *prefix;
281
282         prefix = NULL;
283         help = argc == 2 && !strcmp(argv[1], "-h");
284         if (!help) {
285                 if (p->option & RUN_SETUP)
286                         prefix = setup_git_directory();
287                 if (p->option & RUN_SETUP_GENTLY) {
288                         int nongit_ok;
289                         prefix = setup_git_directory_gently(&nongit_ok);
290                 }
291
292                 if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY))
293                         use_pager = check_pager_config(p->cmd);
294                 if (use_pager == -1 && p->option & USE_PAGER)
295                         use_pager = 1;
296
297                 if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) &&
298                     startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */
299                         trace_repo_setup(prefix);
300         }
301         commit_pager_choice();
302
303         if (!help && p->option & NEED_WORK_TREE)
304                 setup_work_tree();
305
306         trace_argv_printf(argv, "trace: built-in: git");
307
308         status = p->fn(argc, argv, prefix);
309         if (status)
310                 return status;
311
312         /* Somebody closed stdout? */
313         if (fstat(fileno(stdout), &st))
314                 return 0;
315         /* Ignore write errors for pipes and sockets.. */
316         if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
317                 return 0;
318
319         /* Check for ENOSPC and EIO errors.. */
320         if (fflush(stdout))
321                 die_errno("write failure on standard output");
322         if (ferror(stdout))
323                 die("unknown write failure on standard output");
324         if (fclose(stdout))
325                 die_errno("close failed on standard output");
326         return 0;
327 }
328
329 static void handle_internal_command(int argc, const char **argv)
330 {
331         const char *cmd = argv[0];
332         static struct cmd_struct commands[] = {
333                 { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
334                 { "annotate", cmd_annotate, RUN_SETUP },
335                 { "apply", cmd_apply, RUN_SETUP_GENTLY },
336                 { "archive", cmd_archive },
337                 { "bisect--helper", cmd_bisect__helper, RUN_SETUP },
338                 { "blame", cmd_blame, RUN_SETUP },
339                 { "branch", cmd_branch, RUN_SETUP },
340                 { "bundle", cmd_bundle, RUN_SETUP_GENTLY },
341                 { "cat-file", cmd_cat_file, RUN_SETUP },
342                 { "check-attr", cmd_check_attr, RUN_SETUP },
343                 { "check-ref-format", cmd_check_ref_format },
344                 { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE },
345                 { "checkout-index", cmd_checkout_index,
346                         RUN_SETUP | NEED_WORK_TREE},
347                 { "cherry", cmd_cherry, RUN_SETUP },
348                 { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
349                 { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
350                 { "clone", cmd_clone },
351                 { "column", cmd_column, RUN_SETUP_GENTLY },
352                 { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
353                 { "commit-tree", cmd_commit_tree, RUN_SETUP },
354                 { "config", cmd_config, RUN_SETUP_GENTLY },
355                 { "count-objects", cmd_count_objects, RUN_SETUP },
356                 { "describe", cmd_describe, RUN_SETUP },
357                 { "diff", cmd_diff },
358                 { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
359                 { "diff-index", cmd_diff_index, RUN_SETUP },
360                 { "diff-tree", cmd_diff_tree, RUN_SETUP },
361                 { "fast-export", cmd_fast_export, RUN_SETUP },
362                 { "fetch", cmd_fetch, RUN_SETUP },
363                 { "fetch-pack", cmd_fetch_pack, RUN_SETUP },
364                 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
365                 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
366                 { "format-patch", cmd_format_patch, RUN_SETUP },
367                 { "fsck", cmd_fsck, RUN_SETUP },
368                 { "fsck-objects", cmd_fsck, RUN_SETUP },
369                 { "gc", cmd_gc, RUN_SETUP },
370                 { "get-tar-commit-id", cmd_get_tar_commit_id },
371                 { "grep", cmd_grep, RUN_SETUP_GENTLY },
372                 { "hash-object", cmd_hash_object },
373                 { "help", cmd_help },
374                 { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
375                 { "init", cmd_init_db },
376                 { "init-db", cmd_init_db },
377                 { "log", cmd_log, RUN_SETUP },
378                 { "ls-files", cmd_ls_files, RUN_SETUP },
379                 { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
380                 { "ls-tree", cmd_ls_tree, RUN_SETUP },
381                 { "mailinfo", cmd_mailinfo },
382                 { "mailsplit", cmd_mailsplit },
383                 { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
384                 { "merge-base", cmd_merge_base, RUN_SETUP },
385                 { "merge-file", cmd_merge_file, RUN_SETUP_GENTLY },
386                 { "merge-index", cmd_merge_index, RUN_SETUP },
387                 { "merge-ours", cmd_merge_ours, RUN_SETUP },
388                 { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
389                 { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
390                 { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
391                 { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE },
392                 { "merge-tree", cmd_merge_tree, RUN_SETUP },
393                 { "mktag", cmd_mktag, RUN_SETUP },
394                 { "mktree", cmd_mktree, RUN_SETUP },
395                 { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE },
396                 { "name-rev", cmd_name_rev, RUN_SETUP },
397                 { "notes", cmd_notes, RUN_SETUP },
398                 { "pack-objects", cmd_pack_objects, RUN_SETUP },
399                 { "pack-redundant", cmd_pack_redundant, RUN_SETUP },
400                 { "pack-refs", cmd_pack_refs, RUN_SETUP },
401                 { "patch-id", cmd_patch_id },
402                 { "peek-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
403                 { "pickaxe", cmd_blame, RUN_SETUP },
404                 { "prune", cmd_prune, RUN_SETUP },
405                 { "prune-packed", cmd_prune_packed, RUN_SETUP },
406                 { "push", cmd_push, RUN_SETUP },
407                 { "read-tree", cmd_read_tree, RUN_SETUP },
408                 { "receive-pack", cmd_receive_pack },
409                 { "reflog", cmd_reflog, RUN_SETUP },
410                 { "remote", cmd_remote, RUN_SETUP },
411                 { "remote-ext", cmd_remote_ext },
412                 { "remote-fd", cmd_remote_fd },
413                 { "replace", cmd_replace, RUN_SETUP },
414                 { "repo-config", cmd_repo_config, RUN_SETUP_GENTLY },
415                 { "rerere", cmd_rerere, RUN_SETUP },
416                 { "reset", cmd_reset, RUN_SETUP },
417                 { "rev-list", cmd_rev_list, RUN_SETUP },
418                 { "rev-parse", cmd_rev_parse },
419                 { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE },
420                 { "rm", cmd_rm, RUN_SETUP },
421                 { "send-pack", cmd_send_pack, RUN_SETUP },
422                 { "shortlog", cmd_shortlog, RUN_SETUP_GENTLY | USE_PAGER },
423                 { "show", cmd_show, RUN_SETUP },
424                 { "show-branch", cmd_show_branch, RUN_SETUP },
425                 { "show-ref", cmd_show_ref, RUN_SETUP },
426                 { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
427                 { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
428                 { "stripspace", cmd_stripspace },
429                 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
430                 { "tag", cmd_tag, RUN_SETUP },
431                 { "tar-tree", cmd_tar_tree },
432                 { "unpack-file", cmd_unpack_file, RUN_SETUP },
433                 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
434                 { "update-index", cmd_update_index, RUN_SETUP },
435                 { "update-ref", cmd_update_ref, RUN_SETUP },
436                 { "update-server-info", cmd_update_server_info, RUN_SETUP },
437                 { "upload-archive", cmd_upload_archive },
438                 { "upload-archive--writer", cmd_upload_archive_writer },
439                 { "var", cmd_var, RUN_SETUP_GENTLY },
440                 { "verify-pack", cmd_verify_pack },
441                 { "verify-tag", cmd_verify_tag, RUN_SETUP },
442                 { "version", cmd_version },
443                 { "whatchanged", cmd_whatchanged, RUN_SETUP },
444                 { "write-tree", cmd_write_tree, RUN_SETUP },
445         };
446         int i;
447         static const char ext[] = STRIP_EXTENSION;
448
449         if (sizeof(ext) > 1) {
450                 i = strlen(argv[0]) - strlen(ext);
451                 if (i > 0 && !strcmp(argv[0] + i, ext)) {
452                         char *argv0 = xstrdup(argv[0]);
453                         argv[0] = cmd = argv0;
454                         argv0[i] = '\0';
455                 }
456         }
457
458         /* Turn "git cmd --help" into "git help cmd" */
459         if (argc > 1 && !strcmp(argv[1], "--help")) {
460                 argv[1] = argv[0];
461                 argv[0] = cmd = "help";
462         }
463
464         for (i = 0; i < ARRAY_SIZE(commands); i++) {
465                 struct cmd_struct *p = commands+i;
466                 if (strcmp(p->cmd, cmd))
467                         continue;
468                 exit(run_builtin(p, argc, argv));
469         }
470 }
471
472 static void execv_dashed_external(const char **argv)
473 {
474         struct strbuf cmd = STRBUF_INIT;
475         const char *tmp;
476         int status;
477
478         if (use_pager == -1)
479                 use_pager = check_pager_config(argv[0]);
480         commit_pager_choice();
481
482         strbuf_addf(&cmd, "git-%s", argv[0]);
483
484         /*
485          * argv[0] must be the git command, but the argv array
486          * belongs to the caller, and may be reused in
487          * subsequent loop iterations. Save argv[0] and
488          * restore it on error.
489          */
490         tmp = argv[0];
491         argv[0] = cmd.buf;
492
493         trace_argv_printf(argv, "trace: exec:");
494
495         /*
496          * if we fail because the command is not found, it is
497          * OK to return. Otherwise, we just pass along the status code.
498          */
499         status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
500         if (status >= 0 || errno != ENOENT)
501                 exit(status);
502
503         argv[0] = tmp;
504
505         strbuf_release(&cmd);
506 }
507
508 static int run_argv(int *argcp, const char ***argv)
509 {
510         int done_alias = 0;
511
512         while (1) {
513                 /* See if it's an internal command */
514                 handle_internal_command(*argcp, *argv);
515
516                 /* .. then try the external ones */
517                 execv_dashed_external(*argv);
518
519                 /* It could be an alias -- this works around the insanity
520                  * of overriding "git log" with "git show" by having
521                  * alias.log = show
522                  */
523                 if (done_alias || !handle_alias(argcp, argv))
524                         break;
525                 done_alias = 1;
526         }
527
528         return done_alias;
529 }
530
531
532 int main(int argc, const char **argv)
533 {
534         const char *cmd;
535
536         startup_info = &git_startup_info;
537
538         cmd = git_extract_argv0_path(argv[0]);
539         if (!cmd)
540                 cmd = "git-help";
541
542         git_setup_gettext();
543
544         /*
545          * "git-xxxx" is the same as "git xxxx", but we obviously:
546          *
547          *  - cannot take flags in between the "git" and the "xxxx".
548          *  - cannot execute it externally (since it would just do
549          *    the same thing over again)
550          *
551          * So we just directly call the internal command handler, and
552          * die if that one cannot handle it.
553          */
554         if (!prefixcmp(cmd, "git-")) {
555                 cmd += 4;
556                 argv[0] = cmd;
557                 handle_internal_command(argc, argv);
558                 die("cannot handle %s internally", cmd);
559         }
560
561         /* Look for flags.. */
562         argv++;
563         argc--;
564         handle_options(&argv, &argc, NULL);
565         if (argc > 0) {
566                 if (!prefixcmp(argv[0], "--"))
567                         argv[0] += 2;
568         } else {
569                 /* The user didn't specify a command; give them help */
570                 commit_pager_choice();
571                 printf("usage: %s\n\n", git_usage_string);
572                 list_common_cmds_help();
573                 printf("\n%s\n", git_more_info_string);
574                 exit(1);
575         }
576         cmd = argv[0];
577
578         /*
579          * We use PATH to find git commands, but we prepend some higher
580          * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH
581          * environment, and the $(gitexecdir) from the Makefile at build
582          * time.
583          */
584         setup_path();
585
586         while (1) {
587                 static int done_help = 0;
588                 static int was_alias = 0;
589                 was_alias = run_argv(&argc, &argv);
590                 if (errno != ENOENT)
591                         break;
592                 if (was_alias) {
593                         fprintf(stderr, "Expansion of alias '%s' failed; "
594                                 "'%s' is not a git command\n",
595                                 cmd, argv[0]);
596                         exit(1);
597                 }
598                 if (!done_help) {
599                         cmd = argv[0] = help_unknown_cmd(cmd);
600                         done_help = 1;
601                 } else
602                         break;
603         }
604
605         fprintf(stderr, "Failed to run command '%s': %s\n",
606                 cmd, strerror(errno));
607
608         return 1;
609 }