Git.pm: Call external commands using execv_git_cmd()
[git/repo.git] / git.c
blobca8961f0732bacc4efdb3afe9abc2e829ff69ee5
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"
15 #include "builtin.h"
17 static void prepend_to_path(const char *dir, int len)
19 const char *old_path = getenv("PATH");
20 char *path;
21 int path_len = len;
23 if (!old_path)
24 old_path = "/usr/local/bin:/usr/bin:/bin";
26 path_len = len + strlen(old_path) + 1;
28 path = malloc(path_len + 1);
30 memcpy(path, dir, len);
31 path[len] = ':';
32 memcpy(path + len + 1, old_path, path_len - len);
34 setenv("PATH", path, 1);
37 static const char *alias_command;
38 static char *alias_string = NULL;
40 static int git_alias_config(const char *var, const char *value)
42 if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
43 alias_string = strdup(value);
45 return 0;
48 static int split_cmdline(char *cmdline, const char ***argv)
50 int src, dst, count = 0, size = 16;
51 char quoted = 0;
53 *argv = malloc(sizeof(char*) * size);
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);
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 \\");
85 cmdline[dst++] = c;
86 src++;
90 cmdline[dst] = 0;
92 if (quoted) {
93 free(*argv);
94 *argv = NULL;
95 return error("unclosed quote");
98 return count;
101 static int handle_alias(int *argcp, const char ***argv)
103 int nongit = 0, ret = 0, saved_errno = errno;
104 const char *subdir;
106 subdir = setup_git_directory_gently(&nongit);
107 if (!nongit) {
108 int count;
109 const char** new_argv;
111 alias_command = (*argv)[0];
112 git_config(git_alias_config);
113 if (alias_string) {
115 count = split_cmdline(alias_string, &new_argv);
117 if (count < 1)
118 die("empty alias for %s", alias_command);
120 if (!strcmp(alias_command, new_argv[0]))
121 die("recursive alias: %s", alias_command);
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);
131 *argv = new_argv;
132 *argcp += count - 1;
134 ret = 1;
138 if (subdir)
139 chdir(subdir);
141 errno = saved_errno;
143 return ret;
146 const char git_version_string[] = GIT_VERSION;
148 static void handle_internal_command(int argc, const char **argv, char **envp)
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 }
192 int i;
194 /* Turn "git cmd --help" into "git help cmd" */
195 if (argc > 1 && !strcmp(argv[1], "--help")) {
196 argv[1] = argv[0];
197 argv[0] = cmd = "help";
200 for (i = 0; i < ARRAY_SIZE(commands); i++) {
201 struct cmd_struct *p = commands+i;
202 if (strcmp(p->cmd, cmd))
203 continue;
204 exit(p->fn(argc, argv, envp));
208 int main(int argc, const char **argv, char **envp)
210 const char *cmd = argv[0];
211 char *slash = strrchr(cmd, '/');
212 const char *exec_path = NULL;
213 int done_alias = 0;
216 * Take the basename of argv[0] as the command
217 * name, and the dirname as the default exec_path
218 * if it's an absolute path and we don't have
219 * anything better.
221 if (slash) {
222 *slash++ = 0;
223 if (*cmd == '/')
224 exec_path = cmd;
225 cmd = slash;
229 * "git-xxxx" is the same as "git xxxx", but we obviously:
231 * - cannot take flags in between the "git" and the "xxxx".
232 * - cannot execute it externally (since it would just do
233 * the same thing over again)
235 * So we just directly call the internal command handler, and
236 * die if that one cannot handle it.
238 if (!strncmp(cmd, "git-", 4)) {
239 cmd += 4;
240 argv[0] = cmd;
241 handle_internal_command(argc, argv, envp);
242 die("cannot handle %s internally", cmd);
245 /* Default command: "help" */
246 cmd = "help";
248 /* Look for flags.. */
249 while (argc > 1) {
250 cmd = *++argv;
251 argc--;
253 if (strncmp(cmd, "--", 2))
254 break;
256 cmd += 2;
259 * For legacy reasons, the "version" and "help"
260 * commands can be written with "--" prepended
261 * to make them look like flags.
263 if (!strcmp(cmd, "help"))
264 break;
265 if (!strcmp(cmd, "version"))
266 break;
269 * Check remaining flags (which by now must be
270 * "--exec-path", but maybe we will accept
271 * other arguments some day)
273 if (!strncmp(cmd, "exec-path", 9)) {
274 cmd += 9;
275 if (*cmd == '=') {
276 git_set_exec_path(cmd + 1);
277 continue;
279 puts(git_exec_path());
280 exit(0);
282 cmd_usage(0, NULL, NULL);
284 argv[0] = cmd;
287 * We search for git commands in the following order:
288 * - git_exec_path()
289 * - the path of the "git" command if we could find it
290 * in $0
291 * - the regular PATH.
293 if (exec_path)
294 prepend_to_path(exec_path, strlen(exec_path));
295 exec_path = git_exec_path();
296 prepend_to_path(exec_path, strlen(exec_path));
298 while (1) {
299 /* See if it's an internal command */
300 handle_internal_command(argc, argv, envp);
302 /* .. then try the external ones */
303 execv_git_cmd(argv);
305 /* It could be an alias -- this works around the insanity
306 * of overriding "git log" with "git show" by having
307 * alias.log = show
309 if (done_alias || !handle_alias(&argc, &argv))
310 break;
311 done_alias = 1;
314 if (errno == ENOENT)
315 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
317 fprintf(stderr, "Failed to run command '%s': %s\n",
318 cmd, strerror(errno));
320 return 1;