930998bbe542cbaa92b3f16a6b0dc0d6ad43b874
1#include <stdio.h>
2#include <sys/types.h>
3#include <sys/stat.h>
4#include <dirent.h>
5#include <unistd.h>
6#include <stdlib.h>
7#include <string.h>
8#include <errno.h>
9#include <limits.h>
10#include <stdarg.h>
11#include "git-compat-util.h"
12#include "exec_cmd.h"
13#include "cache.h"
14#include "quote.h"
15
16#include "builtin.h"
17
18const char git_usage_string[] =
19 "git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
20
21static void prepend_to_path(const char *dir, int len)
22{
23 const char *old_path = getenv("PATH");
24 char *path;
25 int path_len = len;
26
27 if (!old_path)
28 old_path = "/usr/local/bin:/usr/bin:/bin";
29
30 path_len = len + strlen(old_path) + 1;
31
32 path = malloc(path_len + 1);
33
34 memcpy(path, dir, len);
35 path[len] = ':';
36 memcpy(path + len + 1, old_path, path_len - len);
37
38 setenv("PATH", path, 1);
39}
40
41static int handle_options(const char*** argv, int* argc)
42{
43 int handled = 0;
44
45 while (*argc > 0) {
46 const char *cmd = (*argv)[0];
47 if (cmd[0] != '-')
48 break;
49
50 /*
51 * For legacy reasons, the "version" and "help"
52 * commands can be written with "--" prepended
53 * to make them look like flags.
54 */
55 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
56 break;
57
58 /*
59 * Check remaining flags.
60 */
61 if (!strncmp(cmd, "--exec-path", 11)) {
62 cmd += 11;
63 if (*cmd == '=')
64 git_set_exec_path(cmd + 1);
65 else {
66 puts(git_exec_path());
67 exit(0);
68 }
69 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
70 setup_pager();
71 } else if (!strcmp(cmd, "--git-dir")) {
72 if (*argc < 1)
73 return -1;
74 setenv("GIT_DIR", (*argv)[1], 1);
75 (*argv)++;
76 (*argc)--;
77 } else if (!strncmp(cmd, "--git-dir=", 10)) {
78 setenv("GIT_DIR", cmd + 10, 1);
79 } else if (!strcmp(cmd, "--bare")) {
80 static char git_dir[1024];
81 setenv("GIT_DIR", getcwd(git_dir, 1024), 1);
82 } else {
83 fprintf(stderr, "Unknown option: %s\n", cmd);
84 usage(git_usage_string);
85 }
86
87 (*argv)++;
88 (*argc)--;
89 handled++;
90 }
91 return handled;
92}
93
94static const char *alias_command;
95static char *alias_string;
96
97static int git_alias_config(const char *var, const char *value)
98{
99 if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
100 alias_string = strdup(value);
101 }
102 return 0;
103}
104
105static int split_cmdline(char *cmdline, const char ***argv)
106{
107 int src, dst, count = 0, size = 16;
108 char quoted = 0;
109
110 *argv = malloc(sizeof(char*) * size);
111
112 /* split alias_string */
113 (*argv)[count++] = cmdline;
114 for (src = dst = 0; cmdline[src];) {
115 char c = cmdline[src];
116 if (!quoted && isspace(c)) {
117 cmdline[dst++] = 0;
118 while (cmdline[++src]
119 && isspace(cmdline[src]))
120 ; /* skip */
121 if (count >= size) {
122 size += 16;
123 *argv = realloc(*argv, sizeof(char*) * size);
124 }
125 (*argv)[count++] = cmdline + dst;
126 } else if(!quoted && (c == '\'' || c == '"')) {
127 quoted = c;
128 src++;
129 } else if (c == quoted) {
130 quoted = 0;
131 src++;
132 } else {
133 if (c == '\\' && quoted != '\'') {
134 src++;
135 c = cmdline[src];
136 if (!c) {
137 free(*argv);
138 *argv = NULL;
139 return error("cmdline ends with \\");
140 }
141 }
142 cmdline[dst++] = c;
143 src++;
144 }
145 }
146
147 cmdline[dst] = 0;
148
149 if (quoted) {
150 free(*argv);
151 *argv = NULL;
152 return error("unclosed quote");
153 }
154
155 return count;
156}
157
158static int handle_alias(int *argcp, const char ***argv)
159{
160 int nongit = 0, ret = 0, saved_errno = errno;
161 const char *subdir;
162 int count, option_count;
163 const char** new_argv;
164
165 subdir = setup_git_directory_gently(&nongit);
166
167 alias_command = (*argv)[0];
168 git_config(git_alias_config);
169 if (alias_string) {
170 count = split_cmdline(alias_string, &new_argv);
171 option_count = handle_options(&new_argv, &count);
172 memmove(new_argv - option_count, new_argv,
173 count * sizeof(char *));
174 new_argv -= option_count;
175
176 if (count < 1)
177 die("empty alias for %s", alias_command);
178
179 if (!strcmp(alias_command, new_argv[0]))
180 die("recursive alias: %s", alias_command);
181
182 if (getenv("GIT_TRACE")) {
183 int i;
184 fprintf(stderr, "trace: alias expansion: %s =>",
185 alias_command);
186 for (i = 0; i < count; ++i) {
187 fputc(' ', stderr);
188 sq_quote_print(stderr, new_argv[i]);
189 }
190 fputc('\n', stderr);
191 fflush(stderr);
192 }
193
194 new_argv = realloc(new_argv, sizeof(char*) *
195 (count + *argcp + 1));
196 /* insert after command name */
197 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
198 new_argv[count+*argcp] = NULL;
199
200 *argv = new_argv;
201 *argcp += count - 1;
202
203 ret = 1;
204 }
205
206 if (subdir)
207 chdir(subdir);
208
209 errno = saved_errno;
210
211 return ret;
212}
213
214const char git_version_string[] = GIT_VERSION;
215
216#define RUN_SETUP (1<<0)
217#define USE_PAGER (1<<1)
218
219static void handle_internal_command(int argc, const char **argv, char **envp)
220{
221 const char *cmd = argv[0];
222 static struct cmd_struct {
223 const char *cmd;
224 int (*fn)(int, const char **, const char *);
225 int option;
226 } commands[] = {
227 { "add", cmd_add, RUN_SETUP },
228 { "apply", cmd_apply },
229 { "cat-file", cmd_cat_file, RUN_SETUP },
230 { "checkout-index", cmd_checkout_index, RUN_SETUP },
231 { "check-ref-format", cmd_check_ref_format },
232 { "commit-tree", cmd_commit_tree, RUN_SETUP },
233 { "count-objects", cmd_count_objects },
234 { "diff", cmd_diff, RUN_SETUP },
235 { "diff-files", cmd_diff_files, RUN_SETUP },
236 { "diff-index", cmd_diff_index, RUN_SETUP },
237 { "diff-stages", cmd_diff_stages, RUN_SETUP },
238 { "diff-tree", cmd_diff_tree, RUN_SETUP },
239 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
240 { "format-patch", cmd_format_patch, RUN_SETUP },
241 { "get-tar-commit-id", cmd_get_tar_commit_id },
242 { "grep", cmd_grep, RUN_SETUP },
243 { "help", cmd_help },
244 { "init-db", cmd_init_db },
245 { "log", cmd_log, RUN_SETUP | USE_PAGER },
246 { "ls-files", cmd_ls_files, RUN_SETUP },
247 { "ls-tree", cmd_ls_tree, RUN_SETUP },
248 { "mailinfo", cmd_mailinfo },
249 { "mailsplit", cmd_mailsplit },
250 { "mv", cmd_mv, RUN_SETUP },
251 { "name-rev", cmd_name_rev, RUN_SETUP },
252 { "pack-objects", cmd_pack_objects, RUN_SETUP },
253 { "prune", cmd_prune, RUN_SETUP },
254 { "prune-packed", cmd_prune_packed, RUN_SETUP },
255 { "push", cmd_push, RUN_SETUP },
256 { "read-tree", cmd_read_tree, RUN_SETUP },
257 { "repo-config", cmd_repo_config },
258 { "rev-list", cmd_rev_list, RUN_SETUP },
259 { "rev-parse", cmd_rev_parse, RUN_SETUP },
260 { "rm", cmd_rm, RUN_SETUP },
261 { "show-branch", cmd_show_branch, RUN_SETUP },
262 { "show", cmd_show, RUN_SETUP | USE_PAGER },
263 { "stripspace", cmd_stripspace },
264 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
265 { "tar-tree", cmd_tar_tree, RUN_SETUP },
266 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
267 { "update-index", cmd_update_index, RUN_SETUP },
268 { "update-ref", cmd_update_ref, RUN_SETUP },
269 { "upload-tar", cmd_upload_tar },
270 { "version", cmd_version },
271 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
272 { "write-tree", cmd_write_tree, RUN_SETUP },
273 { "verify-pack", cmd_verify_pack },
274 };
275 int i;
276
277 /* Turn "git cmd --help" into "git help cmd" */
278 if (argc > 1 && !strcmp(argv[1], "--help")) {
279 argv[1] = argv[0];
280 argv[0] = cmd = "help";
281 }
282
283 for (i = 0; i < ARRAY_SIZE(commands); i++) {
284 struct cmd_struct *p = commands+i;
285 const char *prefix;
286 if (strcmp(p->cmd, cmd))
287 continue;
288
289 prefix = NULL;
290 if (p->option & RUN_SETUP)
291 prefix = setup_git_directory();
292 if (p->option & USE_PAGER)
293 setup_pager();
294 if (getenv("GIT_TRACE")) {
295 int i;
296 fprintf(stderr, "trace: built-in: git");
297 for (i = 0; i < argc; ++i) {
298 fputc(' ', stderr);
299 sq_quote_print(stderr, argv[i]);
300 }
301 putc('\n', stderr);
302 fflush(stderr);
303 }
304
305 exit(p->fn(argc, argv, prefix));
306 }
307}
308
309int main(int argc, const char **argv, char **envp)
310{
311 const char *cmd = argv[0];
312 char *slash = strrchr(cmd, '/');
313 const char *exec_path = NULL;
314 int done_alias = 0;
315
316 /*
317 * Take the basename of argv[0] as the command
318 * name, and the dirname as the default exec_path
319 * if it's an absolute path and we don't have
320 * anything better.
321 */
322 if (slash) {
323 *slash++ = 0;
324 if (*cmd == '/')
325 exec_path = cmd;
326 cmd = slash;
327 }
328
329 /*
330 * "git-xxxx" is the same as "git xxxx", but we obviously:
331 *
332 * - cannot take flags in between the "git" and the "xxxx".
333 * - cannot execute it externally (since it would just do
334 * the same thing over again)
335 *
336 * So we just directly call the internal command handler, and
337 * die if that one cannot handle it.
338 */
339 if (!strncmp(cmd, "git-", 4)) {
340 cmd += 4;
341 argv[0] = cmd;
342 handle_internal_command(argc, argv, envp);
343 die("cannot handle %s internally", cmd);
344 }
345
346 /* Look for flags.. */
347 argv++;
348 argc--;
349 handle_options(&argv, &argc);
350 if (argc > 0) {
351 if (!strncmp(argv[0], "--", 2))
352 argv[0] += 2;
353 } else {
354 /* Default command: "help" */
355 argv[0] = "help";
356 argc = 1;
357 }
358 cmd = argv[0];
359
360 /*
361 * We search for git commands in the following order:
362 * - git_exec_path()
363 * - the path of the "git" command if we could find it
364 * in $0
365 * - the regular PATH.
366 */
367 if (exec_path)
368 prepend_to_path(exec_path, strlen(exec_path));
369 exec_path = git_exec_path();
370 prepend_to_path(exec_path, strlen(exec_path));
371
372 while (1) {
373 /* See if it's an internal command */
374 handle_internal_command(argc, argv, envp);
375
376 /* .. then try the external ones */
377 execv_git_cmd(argv);
378
379 /* It could be an alias -- this works around the insanity
380 * of overriding "git log" with "git show" by having
381 * alias.log = show
382 */
383 if (done_alias || !handle_alias(&argc, &argv))
384 break;
385 done_alias = 1;
386 }
387
388 if (errno == ENOENT)
389 help_unknown_cmd(cmd);
390
391 fprintf(stderr, "Failed to run command '%s': %s\n",
392 cmd, strerror(errno));
393
394 return 1;
395}