gitweb: Use 's' regexp modifier to secure against filenames with LF
[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 17
822a7d50 18const char git_usage_string[] =
281e67d6 19 "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate] [--bare] [--git-dir=GIT_DIR] [--help] COMMAND [ARGS]";
822a7d50 20
8e49d503
AE
21static void prepend_to_path(const char *dir, int len)
22{
554fe20d
TH
23 const char *old_path = getenv("PATH");
24 char *path;
8e49d503
AE
25 int path_len = len;
26
27 if (!old_path)
7dbc2c04 28 old_path = "/usr/local/bin:/usr/bin:/bin";
8e49d503
AE
29
30 path_len = len + strlen(old_path) + 1;
31
2d7320d0 32 path = xmalloc(path_len + 1);
8e49d503
AE
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);
0caea90b
CC
39
40 free(path);
8e49d503
AE
41}
42
4ab243a9
JS
43static int handle_options(const char*** argv, int* argc)
44{
45 int handled = 0;
46
47 while (*argc > 0) {
48 const char *cmd = (*argv)[0];
49 if (cmd[0] != '-')
50 break;
51
6acbcb92
JS
52 /*
53 * For legacy reasons, the "version" and "help"
54 * commands can be written with "--" prepended
55 * to make them look like flags.
56 */
57 if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
58 break;
59
60 /*
61 * Check remaining flags.
62 */
63 if (!strncmp(cmd, "--exec-path", 11)) {
64 cmd += 11;
65 if (*cmd == '=')
66 git_set_exec_path(cmd + 1);
67 else {
68 puts(git_exec_path());
69 exit(0);
70 }
71 } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
4ab243a9 72 setup_pager();
6acbcb92
JS
73 } else if (!strcmp(cmd, "--git-dir")) {
74 if (*argc < 1)
75 return -1;
76 setenv("GIT_DIR", (*argv)[1], 1);
77 (*argv)++;
78 (*argc)--;
79 } else if (!strncmp(cmd, "--git-dir=", 10)) {
80 setenv("GIT_DIR", cmd + 10, 1);
81 } else if (!strcmp(cmd, "--bare")) {
82 static char git_dir[1024];
83 setenv("GIT_DIR", getcwd(git_dir, 1024), 1);
84 } else {
85 fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50 86 usage(git_usage_string);
6acbcb92 87 }
4ab243a9
JS
88
89 (*argv)++;
90 (*argc)--;
91 handled++;
92 }
93 return handled;
94}
95
2b11e317 96static const char *alias_command;
96f1e58f 97static char *alias_string;
2b11e317
JS
98
99static int git_alias_config(const char *var, const char *value)
100{
101 if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
9befac47 102 alias_string = xstrdup(value);
2b11e317
JS
103 }
104 return 0;
105}
106
107static int split_cmdline(char *cmdline, const char ***argv)
108{
109 int src, dst, count = 0, size = 16;
110 char quoted = 0;
111
112 *argv = malloc(sizeof(char*) * size);
113
114 /* split alias_string */
115 (*argv)[count++] = cmdline;
116 for (src = dst = 0; cmdline[src];) {
117 char c = cmdline[src];
118 if (!quoted && isspace(c)) {
119 cmdline[dst++] = 0;
120 while (cmdline[++src]
121 && isspace(cmdline[src]))
122 ; /* skip */
123 if (count >= size) {
124 size += 16;
83572c1a 125 *argv = xrealloc(*argv, sizeof(char*) * size);
2b11e317
JS
126 }
127 (*argv)[count++] = cmdline + dst;
128 } else if(!quoted && (c == '\'' || c == '"')) {
129 quoted = c;
130 src++;
131 } else if (c == quoted) {
132 quoted = 0;
133 src++;
134 } else {
135 if (c == '\\' && quoted != '\'') {
136 src++;
137 c = cmdline[src];
138 if (!c) {
139 free(*argv);
140 *argv = NULL;
141 return error("cmdline ends with \\");
142 }
143 }
144 cmdline[dst++] = c;
145 src++;
146 }
147 }
148
149 cmdline[dst] = 0;
150
151 if (quoted) {
152 free(*argv);
153 *argv = NULL;
154 return error("unclosed quote");
155 }
156
157 return count;
158}
159
160static int handle_alias(int *argcp, const char ***argv)
161{
47e5c0ca 162 int nongit = 0, ret = 0, saved_errno = errno;
2b11e317 163 const char *subdir;
0347a8c7
ML
164 int count, option_count;
165 const char** new_argv;
2b11e317
JS
166
167 subdir = setup_git_directory_gently(&nongit);
0347a8c7
ML
168
169 alias_command = (*argv)[0];
170 git_config(git_alias_config);
171 if (alias_string) {
172 count = split_cmdline(alias_string, &new_argv);
173 option_count = handle_options(&new_argv, &count);
174 memmove(new_argv - option_count, new_argv,
175 count * sizeof(char *));
176 new_argv -= option_count;
177
178 if (count < 1)
179 die("empty alias for %s", alias_command);
180
181 if (!strcmp(alias_command, new_argv[0]))
182 die("recursive alias: %s", alias_command);
183
6ce4e61f
CC
184 trace_argv_printf(new_argv, count,
185 "trace: alias expansion: %s =>",
186 alias_command);
575ba9d6 187
83572c1a
JF
188 new_argv = xrealloc(new_argv, sizeof(char*) *
189 (count + *argcp + 1));
0347a8c7
ML
190 /* insert after command name */
191 memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
192 new_argv[count+*argcp] = NULL;
2b11e317 193
0347a8c7
ML
194 *argv = new_argv;
195 *argcp += count - 1;
2b11e317 196
0347a8c7 197 ret = 1;
2b11e317
JS
198 }
199
200 if (subdir)
201 chdir(subdir);
202
47e5c0ca
JS
203 errno = saved_errno;
204
2b11e317
JS
205 return ret;
206}
207
70827b15 208const char git_version_string[] = GIT_VERSION;
5b84f4d8 209
efffea03
JH
210#define RUN_SETUP (1<<0)
211#define USE_PAGER (1<<1)
a633fca0 212
9201c707 213static void handle_internal_command(int argc, const char **argv, char **envp)
231af832
LT
214{
215 const char *cmd = argv[0];
216 static struct cmd_struct {
217 const char *cmd;
a633fca0 218 int (*fn)(int, const char **, const char *);
9590b041 219 int option;
231af832 220 } commands[] = {
efffea03 221 { "add", cmd_add, RUN_SETUP },
f789e347 222 { "annotate", cmd_annotate, },
f754fa9c 223 { "apply", cmd_apply },
4df096a5 224 { "archive", cmd_archive },
c31820c2 225 { "branch", cmd_branch },
efffea03
JH
226 { "cat-file", cmd_cat_file, RUN_SETUP },
227 { "checkout-index", cmd_checkout_index, RUN_SETUP },
0864f264 228 { "check-ref-format", cmd_check_ref_format },
e827633a 229 { "cherry", cmd_cherry, RUN_SETUP },
efffea03 230 { "commit-tree", cmd_commit_tree, RUN_SETUP },
8112894d 231 { "count-objects", cmd_count_objects, RUN_SETUP },
e88ee291 232 { "diff", cmd_diff, RUN_SETUP | USE_PAGER },
efffea03
JH
233 { "diff-files", cmd_diff_files, RUN_SETUP },
234 { "diff-index", cmd_diff_index, RUN_SETUP },
235 { "diff-stages", cmd_diff_stages, RUN_SETUP },
236 { "diff-tree", cmd_diff_tree, RUN_SETUP },
237 { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
9f613ddd 238 { "for-each-ref", cmd_for_each_ref, RUN_SETUP },
efffea03 239 { "format-patch", cmd_format_patch, RUN_SETUP },
f754fa9c 240 { "get-tar-commit-id", cmd_get_tar_commit_id },
efffea03 241 { "grep", cmd_grep, RUN_SETUP },
f754fa9c
JH
242 { "help", cmd_help },
243 { "init-db", cmd_init_db },
efffea03
JH
244 { "log", cmd_log, RUN_SETUP | USE_PAGER },
245 { "ls-files", cmd_ls_files, RUN_SETUP },
246 { "ls-tree", cmd_ls_tree, RUN_SETUP },
f754fa9c
JH
247 { "mailinfo", cmd_mailinfo },
248 { "mailsplit", cmd_mailsplit },
efffea03
JH
249 { "mv", cmd_mv, RUN_SETUP },
250 { "name-rev", cmd_name_rev, RUN_SETUP },
251 { "pack-objects", cmd_pack_objects, RUN_SETUP },
252 { "prune", cmd_prune, RUN_SETUP },
253 { "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085 254 { "push", cmd_push, RUN_SETUP },
efffea03 255 { "read-tree", cmd_read_tree, RUN_SETUP },
f754fa9c 256 { "repo-config", cmd_repo_config },
efffea03
JH
257 { "rev-list", cmd_rev_list, RUN_SETUP },
258 { "rev-parse", cmd_rev_parse, RUN_SETUP },
259 { "rm", cmd_rm, RUN_SETUP },
c91f0d92 260 { "runstatus", cmd_runstatus, RUN_SETUP },
efffea03
JH
261 { "show-branch", cmd_show_branch, RUN_SETUP },
262 { "show", cmd_show, RUN_SETUP | USE_PAGER },
f754fa9c 263 { "stripspace", cmd_stripspace },
efffea03 264 { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
9cb90b80 265 { "tar-tree", cmd_tar_tree },
efffea03
JH
266 { "unpack-objects", cmd_unpack_objects, RUN_SETUP },
267 { "update-index", cmd_update_index, RUN_SETUP },
268 { "update-ref", cmd_update_ref, RUN_SETUP },
39345a21 269 { "upload-archive", cmd_upload_archive },
f754fa9c 270 { "version", cmd_version },
efffea03
JH
271 { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
272 { "write-tree", cmd_write_tree, RUN_SETUP },
2e3ed670 273 { "verify-pack", cmd_verify_pack },
358ddb62 274 { "show-ref", cmd_show_ref, RUN_SETUP },
e1e22e37 275 { "pack-refs", cmd_pack_refs, RUN_SETUP },
231af832
LT
276 };
277 int i;
278
1cd95087
LT
279 /* Turn "git cmd --help" into "git help cmd" */
280 if (argc > 1 && !strcmp(argv[1], "--help")) {
281 argv[1] = argv[0];
282 argv[0] = cmd = "help";
283 }
284
231af832
LT
285 for (i = 0; i < ARRAY_SIZE(commands); i++) {
286 struct cmd_struct *p = commands+i;
a633fca0 287 const char *prefix;
231af832
LT
288 if (strcmp(p->cmd, cmd))
289 continue;
575ba9d6 290
a633fca0 291 prefix = NULL;
efffea03 292 if (p->option & RUN_SETUP)
a633fca0 293 prefix = setup_git_directory();
9590b041
JH
294 if (p->option & USE_PAGER)
295 setup_pager();
6ce4e61f 296 trace_argv_printf(argv, argc, "trace: built-in: git");
575ba9d6 297
a633fca0 298 exit(p->fn(argc, argv, prefix));
231af832
LT
299 }
300}
301
9201c707 302int main(int argc, const char **argv, char **envp)
8e49d503 303{
5b6df8e4 304 const char *cmd = argv[0] ? argv[0] : "git-help";
231af832 305 char *slash = strrchr(cmd, '/');
231af832 306 const char *exec_path = NULL;
a025463b 307 int done_alias = 0;
231af832
LT
308
309 /*
310 * Take the basename of argv[0] as the command
311 * name, and the dirname as the default exec_path
312 * if it's an absolute path and we don't have
313 * anything better.
314 */
315 if (slash) {
316 *slash++ = 0;
317 if (*cmd == '/')
318 exec_path = cmd;
319 cmd = slash;
320 }
8e49d503 321
231af832
LT
322 /*
323 * "git-xxxx" is the same as "git xxxx", but we obviously:
324 *
325 * - cannot take flags in between the "git" and the "xxxx".
326 * - cannot execute it externally (since it would just do
327 * the same thing over again)
328 *
329 * So we just directly call the internal command handler, and
330 * die if that one cannot handle it.
331 */
332 if (!strncmp(cmd, "git-", 4)) {
333 cmd += 4;
334 argv[0] = cmd;
335 handle_internal_command(argc, argv, envp);
336 die("cannot handle %s internally", cmd);
337 }
8e49d503 338
231af832 339 /* Look for flags.. */
6acbcb92
JS
340 argv++;
341 argc--;
342 handle_options(&argv, &argc);
343 if (argc > 0) {
344 if (!strncmp(argv[0], "--", 2))
345 argv[0] += 2;
346 } else {
347 /* Default command: "help" */
348 argv[0] = "help";
349 argc = 1;
97fc6c5f 350 }
6acbcb92 351 cmd = argv[0];
231af832
LT
352
353 /*
354 * We search for git commands in the following order:
355 * - git_exec_path()
356 * - the path of the "git" command if we could find it
357 * in $0
358 * - the regular PATH.
359 */
360 if (exec_path)
361 prepend_to_path(exec_path, strlen(exec_path));
77cb17e9
MO
362 exec_path = git_exec_path();
363 prepend_to_path(exec_path, strlen(exec_path));
8e49d503 364
a025463b
JH
365 while (1) {
366 /* See if it's an internal command */
367 handle_internal_command(argc, argv, envp);
2b11e317 368
a025463b
JH
369 /* .. then try the external ones */
370 execv_git_cmd(argv);
231af832 371
a025463b
JH
372 /* It could be an alias -- this works around the insanity
373 * of overriding "git log" with "git show" by having
374 * alias.log = show
375 */
376 if (done_alias || !handle_alias(&argc, &argv))
377 break;
378 done_alias = 1;
379 }
10b15b86
AR
380
381 if (errno == ENOENT)
822a7d50 382 help_unknown_cmd(cmd);
10b15b86
AR
383
384 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 385 cmd, strerror(errno));
8e49d503
AE
386
387 return 1;
388}