Merge branch 'fix'
[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 { "count-objects", cmd_count_objects },
51 { "diff", cmd_diff },
52 };
53 int i;
54
55 /* Turn "git cmd --help" into "git help cmd" */
56 if (argc > 1 && !strcmp(argv[1], "--help")) {
57 argv[1] = argv[0];
58 argv[0] = cmd = "help";
59 }
60
61 for (i = 0; i < ARRAY_SIZE(commands); i++) {
62 struct cmd_struct *p = commands+i;
63 if (strcmp(p->cmd, cmd))
64 continue;
65 exit(p->fn(argc, argv, envp));
66 }
67 }
68
69 int main(int argc, const char **argv, char **envp)
70 {
71 const char *cmd = argv[0];
72 char *slash = strrchr(cmd, '/');
73 char git_command[PATH_MAX + 1];
74 const char *exec_path = NULL;
75
76 /*
77 * Take the basename of argv[0] as the command
78 * name, and the dirname as the default exec_path
79 * if it's an absolute path and we don't have
80 * anything better.
81 */
82 if (slash) {
83 *slash++ = 0;
84 if (*cmd == '/')
85 exec_path = cmd;
86 cmd = slash;
87 }
88
89 /*
90 * "git-xxxx" is the same as "git xxxx", but we obviously:
91 *
92 * - cannot take flags in between the "git" and the "xxxx".
93 * - cannot execute it externally (since it would just do
94 * the same thing over again)
95 *
96 * So we just directly call the internal command handler, and
97 * die if that one cannot handle it.
98 */
99 if (!strncmp(cmd, "git-", 4)) {
100 cmd += 4;
101 argv[0] = cmd;
102 handle_internal_command(argc, argv, envp);
103 die("cannot handle %s internally", cmd);
104 }
105
106 /* Default command: "help" */
107 cmd = "help";
108
109 /* Look for flags.. */
110 while (argc > 1) {
111 cmd = *++argv;
112 argc--;
113
114 if (strncmp(cmd, "--", 2))
115 break;
116
117 cmd += 2;
118
119 /*
120 * For legacy reasons, the "version" and "help"
121 * commands can be written with "--" prepended
122 * to make them look like flags.
123 */
124 if (!strcmp(cmd, "help"))
125 break;
126 if (!strcmp(cmd, "version"))
127 break;
128
129 /*
130 * Check remaining flags (which by now must be
131 * "--exec-path", but maybe we will accept
132 * other arguments some day)
133 */
134 if (!strncmp(cmd, "exec-path", 9)) {
135 cmd += 9;
136 if (*cmd == '=') {
137 git_set_exec_path(cmd + 1);
138 continue;
139 }
140 puts(git_exec_path());
141 exit(0);
142 }
143 cmd_usage(0, NULL, NULL);
144 }
145 argv[0] = cmd;
146
147 /*
148 * We search for git commands in the following order:
149 * - git_exec_path()
150 * - the path of the "git" command if we could find it
151 * in $0
152 * - the regular PATH.
153 */
154 if (exec_path)
155 prepend_to_path(exec_path, strlen(exec_path));
156 exec_path = git_exec_path();
157 prepend_to_path(exec_path, strlen(exec_path));
158
159 /* See if it's an internal command */
160 handle_internal_command(argc, argv, envp);
161
162 /* .. then try the external ones */
163 execv_git_cmd(argv);
164
165 if (errno == ENOENT)
166 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
167
168 fprintf(stderr, "Failed to run command '%s': %s\n",
169 git_command, strerror(errno));
170
171 return 1;
172 }