cvsimport: use git-update-index --index-info
[git/dscho.git] / git.c
blob3216d311b2efdd238f0eb023d6a918e0a43b54ab
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"
14 #include "builtin.h"
16 static void prepend_to_path(const char *dir, int len)
18 char *path, *old_path = getenv("PATH");
19 int path_len = len;
21 if (!old_path)
22 old_path = "/usr/local/bin:/usr/bin:/bin";
24 path_len = len + strlen(old_path) + 1;
26 path = malloc(path_len + 1);
28 memcpy(path, dir, len);
29 path[len] = ':';
30 memcpy(path + len + 1, old_path, path_len - len);
32 setenv("PATH", path, 1);
35 const char git_version_string[] = GIT_VERSION;
37 static void handle_internal_command(int argc, const char **argv, char **envp)
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 { "count-objects", cmd_count_objects },
51 { "diff", cmd_diff },
52 { "grep", cmd_grep },
53 { "rev-list", cmd_rev_list },
54 { "init-db", cmd_init_db },
55 { "check-ref-format", cmd_check_ref_format }
57 int i;
59 /* Turn "git cmd --help" into "git help cmd" */
60 if (argc > 1 && !strcmp(argv[1], "--help")) {
61 argv[1] = argv[0];
62 argv[0] = cmd = "help";
65 for (i = 0; i < ARRAY_SIZE(commands); i++) {
66 struct cmd_struct *p = commands+i;
67 if (strcmp(p->cmd, cmd))
68 continue;
69 exit(p->fn(argc, argv, envp));
73 int main(int argc, const char **argv, char **envp)
75 const char *cmd = argv[0];
76 char *slash = strrchr(cmd, '/');
77 char git_command[PATH_MAX + 1];
78 const char *exec_path = NULL;
81 * Take the basename of argv[0] as the command
82 * name, and the dirname as the default exec_path
83 * if it's an absolute path and we don't have
84 * anything better.
86 if (slash) {
87 *slash++ = 0;
88 if (*cmd == '/')
89 exec_path = cmd;
90 cmd = slash;
94 * "git-xxxx" is the same as "git xxxx", but we obviously:
96 * - cannot take flags in between the "git" and the "xxxx".
97 * - cannot execute it externally (since it would just do
98 * the same thing over again)
100 * So we just directly call the internal command handler, and
101 * die if that one cannot handle it.
103 if (!strncmp(cmd, "git-", 4)) {
104 cmd += 4;
105 argv[0] = cmd;
106 handle_internal_command(argc, argv, envp);
107 die("cannot handle %s internally", cmd);
110 /* Default command: "help" */
111 cmd = "help";
113 /* Look for flags.. */
114 while (argc > 1) {
115 cmd = *++argv;
116 argc--;
118 if (strncmp(cmd, "--", 2))
119 break;
121 cmd += 2;
124 * For legacy reasons, the "version" and "help"
125 * commands can be written with "--" prepended
126 * to make them look like flags.
128 if (!strcmp(cmd, "help"))
129 break;
130 if (!strcmp(cmd, "version"))
131 break;
134 * Check remaining flags (which by now must be
135 * "--exec-path", but maybe we will accept
136 * other arguments some day)
138 if (!strncmp(cmd, "exec-path", 9)) {
139 cmd += 9;
140 if (*cmd == '=') {
141 git_set_exec_path(cmd + 1);
142 continue;
144 puts(git_exec_path());
145 exit(0);
147 cmd_usage(0, NULL, NULL);
149 argv[0] = cmd;
152 * We search for git commands in the following order:
153 * - git_exec_path()
154 * - the path of the "git" command if we could find it
155 * in $0
156 * - the regular PATH.
158 if (exec_path)
159 prepend_to_path(exec_path, strlen(exec_path));
160 exec_path = git_exec_path();
161 prepend_to_path(exec_path, strlen(exec_path));
163 /* See if it's an internal command */
164 handle_internal_command(argc, argv, envp);
166 /* .. then try the external ones */
167 execv_git_cmd(argv);
169 if (errno == ENOENT)
170 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
172 fprintf(stderr, "Failed to run command '%s': %s\n",
173 git_command, strerror(errno));
175 return 1;