Fix up some fallout from "setup_git_directory()" cleanups
[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"
575ba9d6 14#include "quote.h"
8e49d503 15
70827b15 16#include "builtin.h"
8e49d503
AE
17
18static void prepend_to_path(const char *dir, int len)
19{
554fe20d
TH
20 const char *old_path = getenv("PATH");
21 char *path;
8e49d503
AE
22 int path_len = len;
23
24 if (!old_path)
7dbc2c04 25 old_path = "/usr/local/bin:/usr/bin:/bin";
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AE
26
27 path_len = len + strlen(old_path) + 1;
28
29 path = malloc(path_len + 1);
8e49d503
AE
30
31 memcpy(path, dir, len);
32 path[len] = ':';
33 memcpy(path + len + 1, old_path, path_len - len);
34
35 setenv("PATH", path, 1);
36}
37
4ab243a9
JS
38static int handle_options(const char*** argv, int* argc)
39{
40 int handled = 0;
41
42 while (*argc > 0) {
43 const char *cmd = (*argv)[0];
44 if (cmd[0] != '-')
45 break;
46
6acbcb92
JS
47 /*
48 * For legacy reasons, the "version" and "help"
49 * commands can be written with "--" prepended
50 * to make them look like flags.
51 */
52 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
53 break;
54
55 /*
56 * Check remaining flags.
57 */
58 if (!strncmp(cmd, "--exec-path", 11)) {
59 cmd += 11;
60 if (*cmd == '=')
61 git_set_exec_path(cmd + 1);
62 else {
63 puts(git_exec_path());
64 exit(0);
65 }
66 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
4ab243a9 67 setup_pager();
6acbcb92
JS
68 } else if (!strcmp(cmd, "--git-dir")) {
69 if (*argc < 1)
70 return -1;
71 setenv("GIT_DIR", (*argv)[1], 1);
72 (*argv)++;
73 (*argc)--;
74 } else if (!strncmp(cmd, "--git-dir=", 10)) {
75 setenv("GIT_DIR", cmd + 10, 1);
76 } else if (!strcmp(cmd, "--bare")) {
77 static char git_dir[1024];
78 setenv("GIT_DIR", getcwd(git_dir, 1024), 1);
79 } else {
80 fprintf(stderr, "Unknown option: %s\n", cmd);
81 cmd_usage(0, NULL, NULL);
82 }
4ab243a9
JS
83
84 (*argv)++;
85 (*argc)--;
86 handled++;
87 }
88 return handled;
89}
90
2b11e317
JS
91static const char *alias_command;
92static char *alias_string = NULL;
93
94static int git_alias_config(const char *var, const char *value)
95{
96 if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
97 alias_string = strdup(value);
98 }
99 return 0;
100}
101
102static int split_cmdline(char *cmdline, const char ***argv)
103{
104 int src, dst, count = 0, size = 16;
105 char quoted = 0;
106
107 *argv = malloc(sizeof(char*) * size);
108
109 /* split alias_string */
110 (*argv)[count++] = cmdline;
111 for (src = dst = 0; cmdline[src];) {
112 char c = cmdline[src];
113 if (!quoted && isspace(c)) {
114 cmdline[dst++] = 0;
115 while (cmdline[++src]
116 && isspace(cmdline[src]))
117 ; /* skip */
118 if (count >= size) {
119 size += 16;
120 *argv = realloc(*argv, sizeof(char*) * size);
121 }
122 (*argv)[count++] = cmdline + dst;
123 } else if(!quoted && (c == '\'' || c == '"')) {
124 quoted = c;
125 src++;
126 } else if (c == quoted) {
127 quoted = 0;
128 src++;
129 } else {
130 if (c == '\\' && quoted != '\'') {
131 src++;
132 c = cmdline[src];
133 if (!c) {
134 free(*argv);
135 *argv = NULL;
136 return error("cmdline ends with \\");
137 }
138 }
139 cmdline[dst++] = c;
140 src++;
141 }
142 }
143
144 cmdline[dst] = 0;
145
146 if (quoted) {
147 free(*argv);
148 *argv = NULL;
149 return error("unclosed quote");
150 }
151
152 return count;
153}
154
155static int handle_alias(int *argcp, const char ***argv)
156{
47e5c0ca 157 int nongit = 0, ret = 0, saved_errno = errno;
2b11e317 158 const char *subdir;
0347a8c7
ML
159 int count, option_count;
160 const char** new_argv;
2b11e317
JS
161
162 subdir = setup_git_directory_gently(&nongit);
0347a8c7
ML
163
164 alias_command = (*argv)[0];
165 git_config(git_alias_config);
166 if (alias_string) {
167 count = split_cmdline(alias_string, &new_argv);
168 option_count = handle_options(&new_argv, &count);
169 memmove(new_argv - option_count, new_argv,
170 count * sizeof(char *));
171 new_argv -= option_count;
172
173 if (count < 1)
174 die("empty alias for %s", alias_command);
175
176 if (!strcmp(alias_command, new_argv[0]))
177 die("recursive alias: %s", alias_command);
178
179 if (getenv("GIT_TRACE")) {
180 int i;
181 fprintf(stderr, "trace: alias expansion: %s =>",
182 alias_command);
183 for (i = 0; i < count; ++i) {
184 fputc(' ', stderr);
185 sq_quote_print(stderr, new_argv[i]);
575ba9d6 186 }
0347a8c7
ML
187 fputc('\n', stderr);
188 fflush(stderr);
189 }
575ba9d6 190
0347a8c7
ML
191 new_argv = realloc(new_argv, sizeof(char*) *
192 (count + *argcp + 1));
193 /* insert after command name */
194 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
195 new_argv[count+*argcp] = NULL;
2b11e317 196
0347a8c7
ML
197 *argv = new_argv;
198 *argcp += count - 1;
2b11e317 199
0347a8c7 200 ret = 1;
2b11e317
JS
201 }
202
203 if (subdir)
204 chdir(subdir);
205
47e5c0ca
JS
206 errno = saved_errno;
207
2b11e317
JS
208 return ret;
209}
210
70827b15 211const char git_version_string[] = GIT_VERSION;
5b84f4d8 212
a633fca0
LT
213#define NEEDS_PREFIX 1
214
9201c707 215static void handle_internal_command(int argc, const char **argv, char **envp)
231af832
LT
216{
217 const char *cmd = argv[0];
218 static struct cmd_struct {
219 const char *cmd;
a633fca0
LT
220 int (*fn)(int, const char **, const char *);
221 int prefix;
231af832
LT
222 } commands[] = {
223 { "version", cmd_version },
224 { "help", cmd_help },
a633fca0
LT
225 { "log", cmd_log, NEEDS_PREFIX },
226 { "whatchanged", cmd_whatchanged, NEEDS_PREFIX },
227 { "show", cmd_show, NEEDS_PREFIX },
755225de 228 { "push", cmd_push },
a633fca0 229 { "format-patch", cmd_format_patch, NEEDS_PREFIX },
c7432087 230 { "count-objects", cmd_count_objects },
a633fca0
LT
231 { "diff", cmd_diff, NEEDS_PREFIX },
232 { "grep", cmd_grep, NEEDS_PREFIX },
233 { "rm", cmd_rm, NEEDS_PREFIX },
234 { "add", cmd_add, NEEDS_PREFIX },
235 { "rev-list", cmd_rev_list, NEEDS_PREFIX },
c3c8835f 236 { "init-db", cmd_init_db },
52ba03cb 237 { "get-tar-commit-id", cmd_get_tar_commit_id },
21754264 238 { "upload-tar", cmd_upload_tar },
0864f264 239 { "check-ref-format", cmd_check_ref_format },
a633fca0
LT
240 { "ls-files", cmd_ls_files, NEEDS_PREFIX },
241 { "ls-tree", cmd_ls_tree, NEEDS_PREFIX },
242 { "tar-tree", cmd_tar_tree, NEEDS_PREFIX },
243 { "read-tree", cmd_read_tree, NEEDS_PREFIX },
244 { "commit-tree", cmd_commit_tree, NEEDS_PREFIX },
51ce34b9 245 { "apply", cmd_apply },
a633fca0
LT
246 { "show-branch", cmd_show_branch, NEEDS_PREFIX },
247 { "diff-files", cmd_diff_files, NEEDS_PREFIX },
248 { "diff-index", cmd_diff_index, NEEDS_PREFIX },
249 { "diff-stages", cmd_diff_stages, NEEDS_PREFIX },
250 { "diff-tree", cmd_diff_tree, NEEDS_PREFIX },
251 { "cat-file", cmd_cat_file, NEEDS_PREFIX },
252 { "rev-parse", cmd_rev_parse, NEEDS_PREFIX },
253 { "write-tree", cmd_write_tree, NEEDS_PREFIX },
34488e3c 254 { "mailsplit", cmd_mailsplit },
7499c996 255 { "mailinfo", cmd_mailinfo },
fefe81c9 256 { "stripspace", cmd_stripspace },
a633fca0
LT
257 { "update-index", cmd_update_index, NEEDS_PREFIX },
258 { "update-ref", cmd_update_ref, NEEDS_PREFIX },
259 { "fmt-merge-msg", cmd_fmt_merge_msg, NEEDS_PREFIX },
260 { "prune", cmd_prune, NEEDS_PREFIX },
7061cf0f 261 { "mv", cmd_mv, NEEDS_PREFIX },
231af832
LT
262 };
263 int i;
264
1cd95087
LT
265 /* Turn "git cmd --help" into "git help cmd" */
266 if (argc > 1 && !strcmp(argv[1], "--help")) {
267 argv[1] = argv[0];
268 argv[0] = cmd = "help";
269 }
270
231af832
LT
271 for (i = 0; i < ARRAY_SIZE(commands); i++) {
272 struct cmd_struct *p = commands+i;
a633fca0 273 const char *prefix;
231af832
LT
274 if (strcmp(p->cmd, cmd))
275 continue;
575ba9d6 276
a633fca0
LT
277 prefix = NULL;
278 if (p->prefix)
279 prefix = setup_git_directory();
575ba9d6
ML
280 if (getenv("GIT_TRACE")) {
281 int i;
282 fprintf(stderr, "trace: built-in: git");
283 for (i = 0; i < argc; ++i) {
284 fputc(' ', stderr);
285 sq_quote_print(stderr, argv[i]);
286 }
287 putc('\n', stderr);
288 fflush(stderr);
289 }
290
a633fca0 291 exit(p->fn(argc, argv, prefix));
231af832
LT
292 }
293}
294
9201c707 295int main(int argc, const char **argv, char **envp)
8e49d503 296{
9201c707 297 const char *cmd = argv[0];
231af832 298 char *slash = strrchr(cmd, '/');
231af832 299 const char *exec_path = NULL;
a025463b 300 int done_alias = 0;
231af832
LT
301
302 /*
303 * Take the basename of argv[0] as the command
304 * name, and the dirname as the default exec_path
305 * if it's an absolute path and we don't have
306 * anything better.
307 */
308 if (slash) {
309 *slash++ = 0;
310 if (*cmd == '/')
311 exec_path = cmd;
312 cmd = slash;
313 }
8e49d503 314
231af832
LT
315 /*
316 * "git-xxxx" is the same as "git xxxx", but we obviously:
317 *
318 * - cannot take flags in between the "git" and the "xxxx".
319 * - cannot execute it externally (since it would just do
320 * the same thing over again)
321 *
322 * So we just directly call the internal command handler, and
323 * die if that one cannot handle it.
324 */
325 if (!strncmp(cmd, "git-", 4)) {
326 cmd += 4;
327 argv[0] = cmd;
328 handle_internal_command(argc, argv, envp);
329 die("cannot handle %s internally", cmd);
330 }
8e49d503 331
231af832 332 /* Look for flags.. */
6acbcb92
JS
333 argv++;
334 argc--;
335 handle_options(&argv, &argc);
336 if (argc > 0) {
337 if (!strncmp(argv[0], "--", 2))
338 argv[0] += 2;
339 } else {
340 /* Default command: "help" */
341 argv[0] = "help";
342 argc = 1;
97fc6c5f 343 }
6acbcb92 344 cmd = argv[0];
231af832
LT
345
346 /*
347 * We search for git commands in the following order:
348 * - git_exec_path()
349 * - the path of the "git" command if we could find it
350 * in $0
351 * - the regular PATH.
352 */
353 if (exec_path)
354 prepend_to_path(exec_path, strlen(exec_path));
77cb17e9
MO
355 exec_path = git_exec_path();
356 prepend_to_path(exec_path, strlen(exec_path));
8e49d503 357
a025463b
JH
358 while (1) {
359 /* See if it's an internal command */
360 handle_internal_command(argc, argv, envp);
2b11e317 361
a025463b
JH
362 /* .. then try the external ones */
363 execv_git_cmd(argv);
231af832 364
a025463b
JH
365 /* It could be an alias -- this works around the insanity
366 * of overriding "git log" with "git show" by having
367 * alias.log = show
368 */
369 if (done_alias || !handle_alias(&argc, &argv))
370 break;
371 done_alias = 1;
372 }
10b15b86
AR
373
374 if (errno == ENOENT)
a87cd02c 375 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
10b15b86
AR
376
377 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 378 cmd, strerror(errno));
8e49d503
AE
379
380 return 1;
381}