rebase: get rid of outdated MRESOLVEMSG
[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"
8e49d503 14
70827b15 15#include "builtin.h"
8e49d503
AE
16
17static void prepend_to_path(const char *dir, int len)
18{
19 char *path, *old_path = getenv("PATH");
20 int path_len = len;
21
22 if (!old_path)
7dbc2c04 23 old_path = "/usr/local/bin:/usr/bin:/bin";
8e49d503
AE
24
25 path_len = len + strlen(old_path) + 1;
26
27 path = malloc(path_len + 1);
8e49d503
AE
28
29 memcpy(path, dir, len);
30 path[len] = ':';
31 memcpy(path + len + 1, old_path, path_len - len);
32
33 setenv("PATH", path, 1);
34}
35
2b11e317
JS
36static const char *alias_command;
37static char *alias_string = NULL;
38
39static int git_alias_config(const char *var, const char *value)
40{
41 if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
42 alias_string = strdup(value);
43 }
44 return 0;
45}
46
47static int split_cmdline(char *cmdline, const char ***argv)
48{
49 int src, dst, count = 0, size = 16;
50 char quoted = 0;
51
52 *argv = malloc(sizeof(char*) * size);
53
54 /* split alias_string */
55 (*argv)[count++] = cmdline;
56 for (src = dst = 0; cmdline[src];) {
57 char c = cmdline[src];
58 if (!quoted && isspace(c)) {
59 cmdline[dst++] = 0;
60 while (cmdline[++src]
61 && isspace(cmdline[src]))
62 ; /* skip */
63 if (count >= size) {
64 size += 16;
65 *argv = realloc(*argv, sizeof(char*) * size);
66 }
67 (*argv)[count++] = cmdline + dst;
68 } else if(!quoted && (c == '\'' || c == '"')) {
69 quoted = c;
70 src++;
71 } else if (c == quoted) {
72 quoted = 0;
73 src++;
74 } else {
75 if (c == '\\' && quoted != '\'') {
76 src++;
77 c = cmdline[src];
78 if (!c) {
79 free(*argv);
80 *argv = NULL;
81 return error("cmdline ends with \\");
82 }
83 }
84 cmdline[dst++] = c;
85 src++;
86 }
87 }
88
89 cmdline[dst] = 0;
90
91 if (quoted) {
92 free(*argv);
93 *argv = NULL;
94 return error("unclosed quote");
95 }
96
97 return count;
98}
99
100static int handle_alias(int *argcp, const char ***argv)
101{
102 int nongit = 0, ret = 0;
103 const char *subdir;
104
105 subdir = setup_git_directory_gently(&nongit);
106 if (!nongit) {
107 int count;
108 const char** new_argv;
109
110 alias_command = (*argv)[0];
111 git_config(git_alias_config);
112 if (alias_string) {
113
114 count = split_cmdline(alias_string, &new_argv);
115
116 if (count < 1)
117 die("empty alias for %s", alias_command);
118
119 if (!strcmp(alias_command, new_argv[0]))
120 die("recursive alias: %s", alias_command);
121
122 /* insert after command name */
123 if (*argcp > 1) {
124 new_argv = realloc(new_argv, sizeof(char*) *
d8498500
JH
125 (count + *argcp));
126 memcpy(new_argv + count, *argv + 1,
127 sizeof(char*) * *argcp);
2b11e317
JS
128 }
129
130 *argv = new_argv;
131 *argcp += count - 1;
132
133 ret = 1;
134 }
135 }
136
137 if (subdir)
138 chdir(subdir);
139
140 return ret;
141}
142
70827b15 143const char git_version_string[] = GIT_VERSION;
5b84f4d8 144
9201c707 145static void handle_internal_command(int argc, const char **argv, char **envp)
231af832
LT
146{
147 const char *cmd = argv[0];
148 static struct cmd_struct {
149 const char *cmd;
9201c707 150 int (*fn)(int, const char **, char **);
231af832
LT
151 } commands[] = {
152 { "version", cmd_version },
153 { "help", cmd_help },
70b006b9 154 { "log", cmd_log },
70827b15 155 { "whatchanged", cmd_whatchanged },
ba1d4505 156 { "show", cmd_show },
755225de 157 { "push", cmd_push },
68563738 158 { "format-patch", cmd_format_patch },
c7432087 159 { "count-objects", cmd_count_objects },
8ab99476 160 { "diff", cmd_diff },
5010cb5f 161 { "grep", cmd_grep },
d9b814cc 162 { "rm", cmd_rm },
0d781539 163 { "add", cmd_add },
5fb61b8d 164 { "rev-list", cmd_rev_list },
c3c8835f 165 { "init-db", cmd_init_db },
52ba03cb 166 { "get-tar-commit-id", cmd_get_tar_commit_id },
21754264 167 { "upload-tar", cmd_upload_tar },
0864f264 168 { "check-ref-format", cmd_check_ref_format },
aae01bda 169 { "ls-files", cmd_ls_files },
56d1398a 170 { "ls-tree", cmd_ls_tree },
d147e501 171 { "tar-tree", cmd_tar_tree },
6d96ac18 172 { "read-tree", cmd_read_tree },
ac6245e3 173 { "commit-tree", cmd_commit_tree },
51ce34b9 174 { "apply", cmd_apply },
e8cc9cd9
PE
175 { "show-branch", cmd_show_branch },
176 { "diff-files", cmd_diff_files },
177 { "diff-index", cmd_diff_index },
178 { "diff-stages", cmd_diff_stages },
f81daefe 179 { "diff-tree", cmd_diff_tree },
895f10c3 180 { "cat-file", cmd_cat_file },
8ed05fb5 181 { "rev-parse", cmd_rev_parse },
e690e843 182 { "write-tree", cmd_write_tree },
34488e3c 183 { "mailsplit", cmd_mailsplit },
7499c996 184 { "mailinfo", cmd_mailinfo },
fefe81c9 185 { "stripspace", cmd_stripspace },
854b4629
LS
186 { "update-index", cmd_update_index },
187 { "update-ref", cmd_update_ref }
231af832
LT
188 };
189 int i;
190
1cd95087
LT
191 /* Turn "git cmd --help" into "git help cmd" */
192 if (argc > 1 && !strcmp(argv[1], "--help")) {
193 argv[1] = argv[0];
194 argv[0] = cmd = "help";
195 }
196
231af832
LT
197 for (i = 0; i < ARRAY_SIZE(commands); i++) {
198 struct cmd_struct *p = commands+i;
199 if (strcmp(p->cmd, cmd))
200 continue;
201 exit(p->fn(argc, argv, envp));
202 }
203}
204
9201c707 205int main(int argc, const char **argv, char **envp)
8e49d503 206{
9201c707 207 const char *cmd = argv[0];
231af832 208 char *slash = strrchr(cmd, '/');
231af832 209 const char *exec_path = NULL;
a025463b 210 int done_alias = 0;
231af832
LT
211
212 /*
213 * Take the basename of argv[0] as the command
214 * name, and the dirname as the default exec_path
215 * if it's an absolute path and we don't have
216 * anything better.
217 */
218 if (slash) {
219 *slash++ = 0;
220 if (*cmd == '/')
221 exec_path = cmd;
222 cmd = slash;
223 }
8e49d503 224
231af832
LT
225 /*
226 * "git-xxxx" is the same as "git xxxx", but we obviously:
227 *
228 * - cannot take flags in between the "git" and the "xxxx".
229 * - cannot execute it externally (since it would just do
230 * the same thing over again)
231 *
232 * So we just directly call the internal command handler, and
233 * die if that one cannot handle it.
234 */
235 if (!strncmp(cmd, "git-", 4)) {
236 cmd += 4;
237 argv[0] = cmd;
238 handle_internal_command(argc, argv, envp);
239 die("cannot handle %s internally", cmd);
240 }
8e49d503 241
231af832
LT
242 /* Default command: "help" */
243 cmd = "help";
8e49d503 244
231af832
LT
245 /* Look for flags.. */
246 while (argc > 1) {
247 cmd = *++argv;
248 argc--;
da6bf70e 249
231af832 250 if (strncmp(cmd, "--", 2))
8e49d503
AE
251 break;
252
231af832
LT
253 cmd += 2;
254
255 /*
256 * For legacy reasons, the "version" and "help"
257 * commands can be written with "--" prepended
258 * to make them look like flags.
259 */
260 if (!strcmp(cmd, "help"))
261 break;
262 if (!strcmp(cmd, "version"))
263 break;
8e49d503 264
231af832
LT
265 /*
266 * Check remaining flags (which by now must be
267 * "--exec-path", but maybe we will accept
268 * other arguments some day)
269 */
270 if (!strncmp(cmd, "exec-path", 9)) {
271 cmd += 9;
272 if (*cmd == '=') {
273 git_set_exec_path(cmd + 1);
274 continue;
8e49d503 275 }
231af832 276 puts(git_exec_path());
8e49d503
AE
277 exit(0);
278 }
a87cd02c 279 cmd_usage(0, NULL, NULL);
97fc6c5f 280 }
231af832
LT
281 argv[0] = cmd;
282
283 /*
284 * We search for git commands in the following order:
285 * - git_exec_path()
286 * - the path of the "git" command if we could find it
287 * in $0
288 * - the regular PATH.
289 */
290 if (exec_path)
291 prepend_to_path(exec_path, strlen(exec_path));
77cb17e9
MO
292 exec_path = git_exec_path();
293 prepend_to_path(exec_path, strlen(exec_path));
8e49d503 294
a025463b
JH
295 while (1) {
296 /* See if it's an internal command */
297 handle_internal_command(argc, argv, envp);
2b11e317 298
a025463b
JH
299 /* .. then try the external ones */
300 execv_git_cmd(argv);
231af832 301
a025463b
JH
302 /* It could be an alias -- this works around the insanity
303 * of overriding "git log" with "git show" by having
304 * alias.log = show
305 */
306 if (done_alias || !handle_alias(&argc, &argv))
307 break;
308 done_alias = 1;
309 }
10b15b86
AR
310
311 if (errno == ENOENT)
a87cd02c 312 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
10b15b86
AR
313
314 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 315 cmd, strerror(errno));
8e49d503
AE
316
317 return 1;
318}