fetch.c: do not call process_tree() from process_tree().
[git/git.git] / git.c
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
14 #include "builtin.h"
15
16 static void prepend_to_path(const char *dir, int len)
17 {
18 char *path, *old_path = getenv("PATH");
19 int path_len = len;
20
21 if (!old_path)
22 old_path = "/usr/local/bin:/usr/bin:/bin";
23
24 path_len = len + strlen(old_path) + 1;
25
26 path = malloc(path_len + 1);
27
28 memcpy(path, dir, len);
29 path[len] = ':';
30 memcpy(path + len + 1, old_path, path_len - len);
31
32 setenv("PATH", path, 1);
33 }
34
35 const char git_version_string[] = GIT_VERSION;
36
37 static void handle_internal_command(int argc, const char **argv, char **envp)
38 {
39 const char *cmd = argv[0];
40 static struct cmd_struct {
41 const char *cmd;
42 int (*fn)(int, const char **, char **);
43 } commands[] = {
44 { "version", cmd_version },
45 { "help", cmd_help },
46 { "log", cmd_log },
47 { "whatchanged", cmd_whatchanged },
48 { "show", cmd_show },
49 { "push", cmd_push },
50 { "format-patch", cmd_format_patch },
51 { "count-objects", cmd_count_objects },
52 { "diff", cmd_diff },
53 { "grep", cmd_grep },
54 { "rm", cmd_rm },
55 { "add", cmd_add },
56 { "rev-list", cmd_rev_list },
57 { "init-db", cmd_init_db },
58 { "tar-tree", cmd_tar_tree },
59 { "upload-tar", cmd_upload_tar },
60 { "check-ref-format", cmd_check_ref_format },
61 { "ls-files", cmd_ls_files },
62 { "ls-tree", cmd_ls_tree },
63 { "tar-tree", cmd_tar_tree },
64 { "read-tree", cmd_read_tree },
65 { "commit-tree", cmd_commit_tree },
66 { "apply", cmd_apply },
67 { "show-branch", cmd_show_branch },
68 { "diff-files", cmd_diff_files },
69 { "diff-index", cmd_diff_index },
70 { "diff-stages", cmd_diff_stages },
71 { "diff-tree", cmd_diff_tree },
72 { "cat-file", cmd_cat_file }
73 };
74 int i;
75
76 /* Turn "git cmd --help" into "git help cmd" */
77 if (argc > 1 && !strcmp(argv[1], "--help")) {
78 argv[1] = argv[0];
79 argv[0] = cmd = "help";
80 }
81
82 for (i = 0; i < ARRAY_SIZE(commands); i++) {
83 struct cmd_struct *p = commands+i;
84 if (strcmp(p->cmd, cmd))
85 continue;
86 exit(p->fn(argc, argv, envp));
87 }
88 }
89
90 int main(int argc, const char **argv, char **envp)
91 {
92 const char *cmd = argv[0];
93 char *slash = strrchr(cmd, '/');
94 char git_command[PATH_MAX + 1];
95 const char *exec_path = NULL;
96
97 /*
98 * Take the basename of argv[0] as the command
99 * name, and the dirname as the default exec_path
100 * if it's an absolute path and we don't have
101 * anything better.
102 */
103 if (slash) {
104 *slash++ = 0;
105 if (*cmd == '/')
106 exec_path = cmd;
107 cmd = slash;
108 }
109
110 /*
111 * "git-xxxx" is the same as "git xxxx", but we obviously:
112 *
113 * - cannot take flags in between the "git" and the "xxxx".
114 * - cannot execute it externally (since it would just do
115 * the same thing over again)
116 *
117 * So we just directly call the internal command handler, and
118 * die if that one cannot handle it.
119 */
120 if (!strncmp(cmd, "git-", 4)) {
121 cmd += 4;
122 argv[0] = cmd;
123 handle_internal_command(argc, argv, envp);
124 die("cannot handle %s internally", cmd);
125 }
126
127 /* Default command: "help" */
128 cmd = "help";
129
130 /* Look for flags.. */
131 while (argc > 1) {
132 cmd = *++argv;
133 argc--;
134
135 if (strncmp(cmd, "--", 2))
136 break;
137
138 cmd += 2;
139
140 /*
141 * For legacy reasons, the "version" and "help"
142 * commands can be written with "--" prepended
143 * to make them look like flags.
144 */
145 if (!strcmp(cmd, "help"))
146 break;
147 if (!strcmp(cmd, "version"))
148 break;
149
150 /*
151 * Check remaining flags (which by now must be
152 * "--exec-path", but maybe we will accept
153 * other arguments some day)
154 */
155 if (!strncmp(cmd, "exec-path", 9)) {
156 cmd += 9;
157 if (*cmd == '=') {
158 git_set_exec_path(cmd + 1);
159 continue;
160 }
161 puts(git_exec_path());
162 exit(0);
163 }
164 cmd_usage(0, NULL, NULL);
165 }
166 argv[0] = cmd;
167
168 /*
169 * We search for git commands in the following order:
170 * - git_exec_path()
171 * - the path of the "git" command if we could find it
172 * in $0
173 * - the regular PATH.
174 */
175 if (exec_path)
176 prepend_to_path(exec_path, strlen(exec_path));
177 exec_path = git_exec_path();
178 prepend_to_path(exec_path, strlen(exec_path));
179
180 /* See if it's an internal command */
181 handle_internal_command(argc, argv, envp);
182
183 /* .. then try the external ones */
184 execv_git_cmd(argv);
185
186 if (errno == ENOENT)
187 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
188
189 fprintf(stderr, "Failed to run command '%s': %s\n",
190 git_command, strerror(errno));
191
192 return 1;
193 }