summaryrefslogtreecommitdiff
path: root/exec_cmd.c
blob: dedb01da6f1b7e98edb0ce4459039f6825e024da (plain)
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
150
151
152
153
154
155
156
157
158
159
160
161
#include "cache.h"
#include "exec_cmd.h"
#include "quote.h"
#define MAX_ARGS	32
 
extern char **environ;
static const char *argv_exec_path;
static const char *argv0_path;
 
static const char *builtin_exec_path(void)
{
#ifndef __MINGW32__
	return GIT_EXEC_PATH;
#else
	int len;
	char *p, *q, *sl;
	static char *ep;
	if (ep)
		return ep;
 
	len = strlen(_pgmptr);
	if (len < 2)
		return ep = ".";
 
	p = ep = xmalloc(len+1);
	q = _pgmptr;
	sl = NULL;
	/* copy program name, turn '\\' into '/', skip last part */
	while ((*p = *q)) {
		if (*q == '\\' || *q == '/') {
			*p = '/';
			sl = p;
		}
		p++, q++;
	}
	if (sl)
		*sl = '\0';
	else
		ep[0] = '.', ep[1] = '\0';
	return ep;
#endif
}
 
const char *system_path(const char *path)
{
	if (!is_absolute_path(path)) {
		struct strbuf d = STRBUF_INIT;
		strbuf_addf(&d, "%s/%s", git_exec_path(), path);
		path = strbuf_detach(&d, NULL);
	}
	return path;
}
 
void git_set_argv0_path(const char *path)
{
	argv0_path = path;
}
 
void git_set_argv_exec_path(const char *exec_path)
{
	argv_exec_path = exec_path;
}
 
 
/* Returns the highest-priority, location to look for git programs. */
const char *git_exec_path(void)
{
	const char *env;
 
	if (argv_exec_path)
		return argv_exec_path;
 
	env = getenv(EXEC_PATH_ENVIRONMENT);
	if (env && *env) {
		return env;
	}
 
	return builtin_exec_path();
}
 
static void add_path(struct strbuf *out, const char *path)
{
	if (path && *path) {
		if (is_absolute_path(path))
			strbuf_addstr(out, path);
		else
			strbuf_addstr(out, make_absolute_path(path));
 
		strbuf_addch(out, PATH_SEP);
	}
}
 
void setup_path(void)
{
	const char *old_path = getenv("PATH");
	struct strbuf new_path;
 
	strbuf_init(&new_path, 0);
 
	add_path(&new_path, argv_exec_path);
	add_path(&new_path, getenv(EXEC_PATH_ENVIRONMENT));
	add_path(&new_path, builtin_exec_path());
	add_path(&new_path, argv0_path);
 
	if (old_path)
		strbuf_addstr(&new_path, old_path);
	else
		strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
 
	setenv("PATH", new_path.buf, 1);
 
	strbuf_release(&new_path);
}
 
int execv_git_cmd(const char **argv)
{
	int argc;
	const char **nargv;
 
	for (argc = 0; argv[argc]; argc++)
		; /* just counting */
	nargv = xmalloc(sizeof(*nargv) * (argc + 2));
 
	nargv[0] = "git";
	for (argc = 0; argv[argc]; argc++)
		nargv[argc + 1] = argv[argc];
	nargv[argc + 1] = NULL;
	trace_argv_printf(nargv, "trace: exec:");
 
	/* execvp() can only ever return if it fails */
	execvp("git", (char **)nargv);
 
	trace_printf("trace: exec failed: %s\n", strerror(errno));
 
	free(nargv);
	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);
}