1#include "cache.h"
2#include "exec_cmd.h"
3#include "quote.h"
4#define MAX_ARGS 32
5
6static const char *argv_exec_path;
7static const char *argv0_path;
8
9const char *system_path(const char *path)
10{
11#ifdef RUNTIME_PREFIX
12 static const char *prefix;
13#else
14 static const char *prefix = PREFIX;
15#endif
16 struct strbuf d = STRBUF_INIT;
17
18 if (is_absolute_path(path))
19 return path;
20
21#ifdef RUNTIME_PREFIX
22 assert(argv0_path);
23 assert(is_absolute_path(argv0_path));
24
25 if (!prefix &&
26 !(prefix = strip_path_suffix(argv0_path, GIT_EXEC_PATH)) &&
27 !(prefix = strip_path_suffix(argv0_path, BINDIR)) &&
28 !(prefix = strip_path_suffix(argv0_path, "git"))) {
29 prefix = PREFIX;
30 trace_printf("RUNTIME_PREFIX requested, "
31 "but prefix computation failed. "
32 "Using static fallback '%s'.\n", prefix);
33 }
34#endif
35
36 strbuf_addf(&d, "%s/%s", prefix, path);
37 path = strbuf_detach(&d, NULL);
38 return path;
39}
40
41const char *git_extract_argv0_path(const char *argv0)
42{
43 const char *slash;
44
45 if (!argv0 || !*argv0)
46 return NULL;
47 slash = argv0 + strlen(argv0);
48
49 while (argv0 <= slash && !is_dir_sep(*slash))
50 slash--;
51
52 if (slash >= argv0) {
53 argv0_path = xstrndup(argv0, slash - argv0);
54 return slash + 1;
55 }
56
57 return argv0;
58}
59
60void git_set_argv_exec_path(const char *exec_path)
61{
62 argv_exec_path = exec_path;
63 /*
64 * Propagate this setting to external programs.
65 */
66 setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
67}
68
69
70/* Returns the highest-priority, location to look for git programs. */
71const char *git_exec_path(void)
72{
73 const char *env;
74
75 if (argv_exec_path)
76 return argv_exec_path;
77
78 env = getenv(EXEC_PATH_ENVIRONMENT);
79 if (env && *env) {
80 return env;
81 }
82
83 return system_path(GIT_EXEC_PATH);
84}
85
86static void add_path(struct strbuf *out, const char *path)
87{
88 if (path && *path) {
89 strbuf_add_absolute_path(out, path);
90 strbuf_addch(out, PATH_SEP);
91 }
92}
93
94void setup_path(void)
95{
96 const char *old_path = getenv("PATH");
97 struct strbuf new_path = STRBUF_INIT;
98
99 add_path(&new_path, git_exec_path());
100
101 if (old_path)
102 strbuf_addstr(&new_path, old_path);
103 else
104 strbuf_addstr(&new_path, _PATH_DEFPATH);
105
106 setenv("PATH", new_path.buf, 1);
107
108 strbuf_release(&new_path);
109}
110
111const char **prepare_git_cmd(const char **argv)
112{
113 int argc;
114 const char **nargv;
115
116 for (argc = 0; argv[argc]; argc++)
117 ; /* just counting */
118 nargv = xmalloc(sizeof(*nargv) * (argc + 2));
119
120 nargv[0] = "git";
121 for (argc = 0; argv[argc]; argc++)
122 nargv[argc + 1] = argv[argc];
123 nargv[argc + 1] = NULL;
124 return nargv;
125}
126
127int execv_git_cmd(const char **argv) {
128 const char **nargv = prepare_git_cmd(argv);
129 trace_argv_printf(nargv, "trace: exec:");
130
131 /* execvp() can only ever return if it fails */
132 sane_execvp("git", (char **)nargv);
133
134 trace_printf("trace: exec failed: %s\n", strerror(errno));
135
136 free(nargv);
137 return -1;
138}
139
140
141int execl_git_cmd(const char *cmd,...)
142{
143 int argc;
144 const char *argv[MAX_ARGS + 1];
145 const char *arg;
146 va_list param;
147
148 va_start(param, cmd);
149 argv[0] = cmd;
150 argc = 1;
151 while (argc < MAX_ARGS) {
152 arg = argv[argc++] = va_arg(param, char *);
153 if (!arg)
154 break;
155 }
156 va_end(param);
157 if (MAX_ARGS <= argc)
158 return error("too many args to run %s", cmd);
159
160 argv[argc] = NULL;
161 return execv_git_cmd(argv);
162}