256730112e56e19e5df70f2bef4e3efdb1a5e362
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
15#include "builtin.h"
16
17static void prepend_to_path(const char *dir, int len)
18{
19 const char *old_path = getenv("PATH");
20 char *path;
21 int path_len = len;
22
23 if (!old_path)
24 old_path = "/usr/local/bin:/usr/bin:/bin";
25
26 path_len = len + strlen(old_path) + 1;
27
28 path = malloc(path_len + 1);
29
30 memcpy(path, dir, len);
31 path[len] = ':';
32 memcpy(path + len + 1, old_path, path_len - len);
33
34 setenv("PATH", path, 1);
35}
36
37static const char *alias_command;
38static char *alias_string = NULL;
39
40static int git_alias_config(const char *var, const char *value)
41{
42 if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
43 alias_string = strdup(value);
44 }
45 return 0;
46}
47
48static int split_cmdline(char *cmdline, const char ***argv)
49{
50 int src, dst, count = 0, size = 16;
51 char quoted = 0;
52
53 *argv = malloc(sizeof(char*) * size);
54
55 /* split alias_string */
56 (*argv)[count++] = cmdline;
57 for (src = dst = 0; cmdline[src];) {
58 char c = cmdline[src];
59 if (!quoted && isspace(c)) {
60 cmdline[dst++] = 0;
61 while (cmdline[++src]
62 && isspace(cmdline[src]))
63 ; /* skip */
64 if (count >= size) {
65 size += 16;
66 *argv = realloc(*argv, sizeof(char*) * size);
67 }
68 (*argv)[count++] = cmdline + dst;
69 } else if(!quoted && (c == '\'' || c == '"')) {
70 quoted = c;
71 src++;
72 } else if (c == quoted) {
73 quoted = 0;
74 src++;
75 } else {
76 if (c == '\\' && quoted != '\'') {
77 src++;
78 c = cmdline[src];
79 if (!c) {
80 free(*argv);
81 *argv = NULL;
82 return error("cmdline ends with \\");
83 }
84 }
85 cmdline[dst++] = c;
86 src++;
87 }
88 }
89
90 cmdline[dst] = 0;
91
92 if (quoted) {
93 free(*argv);
94 *argv = NULL;
95 return error("unclosed quote");
96 }
97
98 return count;
99}
100
101static int handle_alias(int *argcp, const char ***argv)
102{
103 int nongit = 0, ret = 0, saved_errno = errno;
104 const char *subdir;
105
106 subdir = setup_git_directory_gently(&nongit);
107 if (!nongit) {
108 int count;
109 const char** new_argv;
110
111 alias_command = (*argv)[0];
112 git_config(git_alias_config);
113 if (alias_string) {
114
115 count = split_cmdline(alias_string, &new_argv);
116
117 if (count < 1)
118 die("empty alias for %s", alias_command);
119
120 if (!strcmp(alias_command, new_argv[0]))
121 die("recursive alias: %s", alias_command);
122
123 /* insert after command name */
124 if (*argcp > 1) {
125 new_argv = realloc(new_argv, sizeof(char*) *
126 (count + *argcp));
127 memcpy(new_argv + count, *argv + 1,
128 sizeof(char*) * *argcp);
129 }
130
131 *argv = new_argv;
132 *argcp += count - 1;
133
134 ret = 1;
135 }
136 }
137
138 if (subdir)
139 chdir(subdir);
140
141 errno = saved_errno;
142
143 return ret;
144}
145
146const char git_version_string[] = GIT_VERSION;
147
148static void handle_internal_command(int argc, const char **argv, char **envp)
149{
150 const char *cmd = argv[0];
151 static struct cmd_struct {
152 const char *cmd;
153 int (*fn)(int, const char **, char **);
154 } commands[] = {
155 { "version", cmd_version },
156 { "help", cmd_help },
157 { "log", cmd_log },
158 { "whatchanged", cmd_whatchanged },
159 { "show", cmd_show },
160 { "push", cmd_push },
161 { "format-patch", cmd_format_patch },
162 { "count-objects", cmd_count_objects },
163 { "diff", cmd_diff },
164 { "grep", cmd_grep },
165 { "rm", cmd_rm },
166 { "add", cmd_add },
167 { "rev-list", cmd_rev_list },
168 { "init-db", cmd_init_db },
169 { "get-tar-commit-id", cmd_get_tar_commit_id },
170 { "upload-tar", cmd_upload_tar },
171 { "check-ref-format", cmd_check_ref_format },
172 { "ls-files", cmd_ls_files },
173 { "ls-tree", cmd_ls_tree },
174 { "tar-tree", cmd_tar_tree },
175 { "read-tree", cmd_read_tree },
176 { "commit-tree", cmd_commit_tree },
177 { "apply", cmd_apply },
178 { "show-branch", cmd_show_branch },
179 { "diff-files", cmd_diff_files },
180 { "diff-index", cmd_diff_index },
181 { "diff-stages", cmd_diff_stages },
182 { "diff-tree", cmd_diff_tree },
183 { "cat-file", cmd_cat_file },
184 { "rev-parse", cmd_rev_parse },
185 { "write-tree", cmd_write_tree },
186 { "mailsplit", cmd_mailsplit },
187 { "mailinfo", cmd_mailinfo },
188 { "stripspace", cmd_stripspace },
189 { "update-index", cmd_update_index },
190 { "update-ref", cmd_update_ref },
191 { "fmt-merge-msg", cmd_fmt_merge_msg }
192 };
193 int i;
194
195 /* Turn "git cmd --help" into "git help cmd" */
196 if (argc > 1 && !strcmp(argv[1], "--help")) {
197 argv[1] = argv[0];
198 argv[0] = cmd = "help";
199 }
200
201 for (i = 0; i < ARRAY_SIZE(commands); i++) {
202 struct cmd_struct *p = commands+i;
203 if (strcmp(p->cmd, cmd))
204 continue;
205 exit(p->fn(argc, argv, envp));
206 }
207}
208
209int main(int argc, const char **argv, char **envp)
210{
211 const char *cmd = argv[0];
212 char *slash = strrchr(cmd, '/');
213 const char *exec_path = NULL;
214 int done_alias = 0;
215
216 /*
217 * Take the basename of argv[0] as the command
218 * name, and the dirname as the default exec_path
219 * if it's an absolute path and we don't have
220 * anything better.
221 */
222 if (slash) {
223 *slash++ = 0;
224 if (*cmd == '/')
225 exec_path = cmd;
226 cmd = slash;
227 }
228
229 /*
230 * "git-xxxx" is the same as "git xxxx", but we obviously:
231 *
232 * - cannot take flags in between the "git" and the "xxxx".
233 * - cannot execute it externally (since it would just do
234 * the same thing over again)
235 *
236 * So we just directly call the internal command handler, and
237 * die if that one cannot handle it.
238 */
239 if (!strncmp(cmd, "git-", 4)) {
240 cmd += 4;
241 argv[0] = cmd;
242 handle_internal_command(argc, argv, envp);
243 die("cannot handle %s internally", cmd);
244 }
245
246 /* Default command: "help" */
247 cmd = "help";
248
249 /* Look for flags.. */
250 while (argc > 1) {
251 cmd = *++argv;
252 argc--;
253
254 if (strncmp(cmd, "--", 2))
255 break;
256
257 cmd += 2;
258
259 /*
260 * For legacy reasons, the "version" and "help"
261 * commands can be written with "--" prepended
262 * to make them look like flags.
263 */
264 if (!strcmp(cmd, "help"))
265 break;
266 if (!strcmp(cmd, "version"))
267 break;
268
269 /*
270 * Check remaining flags (which by now must be
271 * "--exec-path", but maybe we will accept
272 * other arguments some day)
273 */
274 if (!strncmp(cmd, "exec-path", 9)) {
275 cmd += 9;
276 if (*cmd == '=') {
277 git_set_exec_path(cmd + 1);
278 continue;
279 }
280 puts(git_exec_path());
281 exit(0);
282 }
283 cmd_usage(0, NULL, NULL);
284 }
285 argv[0] = cmd;
286
287 /*
288 * We search for git commands in the following order:
289 * - git_exec_path()
290 * - the path of the "git" command if we could find it
291 * in $0
292 * - the regular PATH.
293 */
294 if (exec_path)
295 prepend_to_path(exec_path, strlen(exec_path));
296 exec_path = git_exec_path();
297 prepend_to_path(exec_path, strlen(exec_path));
298
299 while (1) {
300 /* See if it's an internal command */
301 handle_internal_command(argc, argv, envp);
302
303 /* .. then try the external ones */
304 execv_git_cmd(argv);
305
306 /* It could be an alias -- this works around the insanity
307 * of overriding "git log" with "git show" by having
308 * alias.log = show
309 */
310 if (done_alias || !handle_alias(&argc, &argv))
311 break;
312 done_alias = 1;
313 }
314
315 if (errno == ENOENT)
316 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
317
318 fprintf(stderr, "Failed to run command '%s': %s\n",
319 cmd, strerror(errno));
320
321 return 1;
322}