1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
#include "cache.h"
#include "exec_cmd.h"
#include "quote.h"
#define MAX_ARGS 32
extern char **environ;
static const char *builtin_exec_path = GIT_EXEC_PATH;
static const char *current_exec_path;
void git_set_exec_path(const char *exec_path)
{
current_exec_path = exec_path;
}
/* Returns the highest-priority, location to look for git programs. */
const char *git_exec_path(void)
{
const char *env;
if (current_exec_path)
return current_exec_path;
env = getenv("GIT_EXEC_PATH");
if (env && *env) {
return env;
}
return builtin_exec_path;
}
int execv_git_cmd(const char **argv)
{
char git_command[PATH_MAX + 1];
int i;
const char *paths[] = { current_exec_path,
getenv("GIT_EXEC_PATH"),
builtin_exec_path };
for (i = 0; i < ARRAY_SIZE(paths); ++i) {
size_t len;
int rc;
const char *exec_dir = paths[i];
const char *tmp;
if (!exec_dir || !*exec_dir) continue;
if (*exec_dir != '/') {
if (!getcwd(git_command, sizeof(git_command))) {
fprintf(stderr, "git: cannot determine "
"current directory: %s\n",
strerror(errno));
break;
}
len = strlen(git_command);
/* Trivial cleanup */
while (!strncmp(exec_dir, "./", 2)) {
exec_dir += 2;
while (*exec_dir == '/')
exec_dir++;
}
rc = snprintf(git_command + len,
sizeof(git_command) - len, "/%s",
exec_dir);
if (rc < 0 || rc >= sizeof(git_command) - len) {
fprintf(stderr, "git: command name given "
"is too long.\n");
break;
}
} else {
if (strlen(exec_dir) + 1 > sizeof(git_command)) {
fprintf(stderr, "git: command name given "
"is too long.\n");
break;
}
strcpy(git_command, exec_dir);
}
len = strlen(git_command);
rc = snprintf(git_command + len, sizeof(git_command) - len,
"/git-%s", argv[0]);
if (rc < 0 || rc >= sizeof(git_command) - len) {
fprintf(stderr,
"git: command name given is too long.\n");
break;
}
/* argv[0] must be the git command, but the argv array
* belongs to the caller, and my be reused in
* subsequent loop iterations. Save argv[0] and
* restore it on error.
*/
tmp = argv[0];
argv[0] = git_command;
if (getenv("GIT_TRACE")) {
const char **p = argv;
fputs("trace: exec:", stderr);
while (*p) {
fputc(' ', stderr);
sq_quote_print(stderr, *p);
++p;
}
putc('\n', stderr);
fflush(stderr);
}
/* execve() can only ever return if it fails */
execve(git_command, (char **)argv, environ);
if (getenv("GIT_TRACE")) {
fprintf(stderr, "trace: exec failed: %s\n",
strerror(errno));
fflush(stderr);
}
argv[0] = tmp;
}
return -1;
}
int execl_git_cmd(const char *cmd,...)
{
int argc;
const char *argv[MAX_ARGS + 1];
const char *arg;
va_list param;
va_start(param, cmd);
argv[0] = cmd;
argc = 1;
while (argc < MAX_ARGS) {
arg = argv[argc++] = va_arg(param, char *);
if (!arg)
break;
}
va_end(param);
if (MAX_ARGS <= argc)
return error("too many args to run %s", cmd);
argv[argc] = NULL;
return execv_git_cmd(argv);
}
|
