fetch.c: do not call process_tree() from process_tree().
[git/git.git] / exec_cmd.c
1 #include "cache.h"
2 #include "exec_cmd.h"
3 #define MAX_ARGS 32
4
5 extern char **environ;
6 static const char *builtin_exec_path = GIT_EXEC_PATH;
7 static const char *current_exec_path = NULL;
8
9 void git_set_exec_path(const char *exec_path)
10 {
11 current_exec_path = exec_path;
12 }
13
14
15 /* Returns the highest-priority, location to look for git programs. */
16 const char *git_exec_path(void)
17 {
18 const char *env;
19
20 if (current_exec_path)
21 return current_exec_path;
22
23 env = getenv("GIT_EXEC_PATH");
24 if (env) {
25 return env;
26 }
27
28 return builtin_exec_path;
29 }
30
31
32 int execv_git_cmd(const char **argv)
33 {
34 char git_command[PATH_MAX + 1];
35 int len, i;
36 const char *paths[] = { current_exec_path,
37 getenv("GIT_EXEC_PATH"),
38 builtin_exec_path };
39
40 for (i = 0; i < ARRAY_SIZE(paths); ++i) {
41 const char *exec_dir = paths[i];
42 const char *tmp;
43
44 if (!exec_dir) continue;
45
46 if (*exec_dir != '/') {
47 if (!getcwd(git_command, sizeof(git_command))) {
48 fprintf(stderr, "git: cannot determine "
49 "current directory\n");
50 exit(1);
51 }
52 len = strlen(git_command);
53
54 /* Trivial cleanup */
55 while (!strncmp(exec_dir, "./", 2)) {
56 exec_dir += 2;
57 while (*exec_dir == '/')
58 exec_dir++;
59 }
60 snprintf(git_command + len, sizeof(git_command) - len,
61 "/%s", exec_dir);
62 } else {
63 strcpy(git_command, exec_dir);
64 }
65
66 len = strlen(git_command);
67 len += snprintf(git_command + len, sizeof(git_command) - len,
68 "/git-%s", argv[0]);
69
70 if (sizeof(git_command) <= len) {
71 fprintf(stderr,
72 "git: command name given is too long.\n");
73 break;
74 }
75
76 /* argv[0] must be the git command, but the argv array
77 * belongs to the caller, and my be reused in
78 * subsequent loop iterations. Save argv[0] and
79 * restore it on error.
80 */
81
82 tmp = argv[0];
83 argv[0] = git_command;
84
85 /* execve() can only ever return if it fails */
86 execve(git_command, (char **)argv, environ);
87
88 argv[0] = tmp;
89 }
90 return -1;
91
92 }
93
94
95 int execl_git_cmd(const char *cmd,...)
96 {
97 int argc;
98 const char *argv[MAX_ARGS + 1];
99 const char *arg;
100 va_list param;
101
102 va_start(param, cmd);
103 argv[0] = cmd;
104 argc = 1;
105 while (argc < MAX_ARGS) {
106 arg = argv[argc++] = va_arg(param, char *);
107 if (!arg)
108 break;
109 }
110 va_end(param);
111 if (MAX_ARGS <= argc)
112 return error("too many args to run %s", cmd);
113
114 argv[argc] = NULL;
115 return execv_git_cmd(argv);
116 }