Use setenv(), fix warnings
[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(char **argv)
33 {
34 char git_command[PATH_MAX + 1];
35 char *tmp;
36 int len, err, i;
37 const char *paths[] = { current_exec_path,
38 getenv("GIT_EXEC_PATH"),
39 builtin_exec_path };
40
41 for (i = 0; i < sizeof(paths)/sizeof(paths[0]); ++i) {
42 const char *exec_dir = paths[i];
43 if (!exec_dir) continue;
44
45 if (*exec_dir != '/') {
46 if (!getcwd(git_command, sizeof(git_command))) {
47 fprintf(stderr, "git: cannot determine "
48 "current directory\n");
49 exit(1);
50 }
51 len = strlen(git_command);
52
53 /* Trivial cleanup */
54 while (!strncmp(exec_dir, "./", 2)) {
55 exec_dir += 2;
56 while (*exec_dir == '/')
57 exec_dir++;
58 }
59 snprintf(git_command + len, sizeof(git_command) - len,
60 "/%s", exec_dir);
61 } else {
62 strcpy(git_command, exec_dir);
63 }
64
65 len = strlen(git_command);
66 len += snprintf(git_command + len, sizeof(git_command) - len,
67 "/git-%s", argv[0]);
68
69 if (sizeof(git_command) <= len) {
70 fprintf(stderr,
71 "git: command name given is too long.\n");
72 break;
73 }
74
75 /* argv[0] must be the git command, but the argv array
76 * belongs to the caller, and my be reused in
77 * subsequent loop iterations. Save argv[0] and
78 * restore it on error.
79 */
80
81 tmp = argv[0];
82 argv[0] = git_command;
83
84 /* execve() can only ever return if it fails */
85 execve(git_command, argv, environ);
86
87 err = errno;
88
89 argv[0] = tmp;
90 }
91 return -1;
92
93 }
94
95
96 int execl_git_cmd(char *cmd,...)
97 {
98 int argc;
99 char *argv[MAX_ARGS + 1];
100 char *arg;
101 va_list param;
102
103 va_start(param, cmd);
104 argv[0] = cmd;
105 argc = 1;
106 while (argc < MAX_ARGS) {
107 arg = argv[argc++] = va_arg(param, char *);
108 if (!arg)
109 break;
110 }
111 va_end(param);
112 if (MAX_ARGS <= argc)
113 return error("too many args to run %s", cmd);
114
115 argv[argc] = NULL;
116 return execv_git_cmd(argv);
117 }