Use #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
[git/git.git] / exec_cmd.c
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1#include "cache.h"
2#include "exec_cmd.h"
3#define MAX_ARGS 32
4
5extern char **environ;
6static const char *builtin_exec_path = GIT_EXEC_PATH;
7static const char *current_exec_path = NULL;
8
9void 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. */
962554c6 16const char *git_exec_path(void)
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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
9201c707 32int execv_git_cmd(const char **argv)
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33{
34 char git_command[PATH_MAX + 1];
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35 int len, err, i;
36 const char *paths[] = { current_exec_path,
37 getenv("GIT_EXEC_PATH"),
38 builtin_exec_path };
39
b4f2a6ac 40 for (i = 0; i < ARRAY_SIZE(paths); ++i) {
77cb17e9 41 const char *exec_dir = paths[i];
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42 const char *tmp;
43
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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 */
9201c707 86 execve(git_command, (char **)argv, environ);
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87
88 err = errno;
89
90 argv[0] = tmp;
91 }
92 return -1;
93
94}
95
96
9201c707 97int execl_git_cmd(const char *cmd,...)
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98{
99 int argc;
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100 const char *argv[MAX_ARGS + 1];
101 const char *arg;
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102 va_list param;
103
104 va_start(param, cmd);
105 argv[0] = cmd;
106 argc = 1;
107 while (argc < MAX_ARGS) {
108 arg = argv[argc++] = va_arg(param, char *);
109 if (!arg)
110 break;
111 }
112 va_end(param);
113 if (MAX_ARGS <= argc)
114 return error("too many args to run %s", cmd);
115
116 argv[argc] = NULL;
117 return execv_git_cmd(argv);
118}