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Commit | Line | Data |
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77cb17e9 MO |
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. */ | |
962554c6 | 16 | const char *git_exec_path(void) |
77cb17e9 MO |
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 | } |