Merge branch 'bc/maint-1.6.1-branch-deleted-was'
[git/git.git] / exec_cmd.c
1 #include "cache.h"
2 #include "exec_cmd.h"
3 #include "quote.h"
4 #define MAX_ARGS 32
5
6 extern char **environ;
7 static const char *argv_exec_path;
8 static const char *argv0_path;
9
10 const char *system_path(const char *path)
11 {
12 #ifdef RUNTIME_PREFIX
13 static const char *prefix;
14 #else
15 static const char *prefix = PREFIX;
16 #endif
17 struct strbuf d = STRBUF_INIT;
18
19 if (is_absolute_path(path))
20 return path;
21
22 #ifdef RUNTIME_PREFIX
23 assert(argv0_path);
24 assert(is_absolute_path(argv0_path));
25
26 if (!prefix &&
27 !(prefix = strip_path_suffix(argv0_path, GIT_EXEC_PATH)) &&
28 !(prefix = strip_path_suffix(argv0_path, BINDIR)) &&
29 !(prefix = strip_path_suffix(argv0_path, "git"))) {
30 prefix = PREFIX;
31 fprintf(stderr, "RUNTIME_PREFIX requested, "
32 "but prefix computation failed. "
33 "Using static fallback '%s'.\n", prefix);
34 }
35 #endif
36
37 strbuf_addf(&d, "%s/%s", prefix, path);
38 path = strbuf_detach(&d, NULL);
39 return path;
40 }
41
42 const char *git_extract_argv0_path(const char *argv0)
43 {
44 const char *slash;
45
46 if (!argv0 || !*argv0)
47 return NULL;
48 slash = argv0 + strlen(argv0);
49
50 while (argv0 <= slash && !is_dir_sep(*slash))
51 slash--;
52
53 if (slash >= argv0) {
54 argv0_path = xstrndup(argv0, slash - argv0);
55 return slash + 1;
56 }
57
58 return argv0;
59 }
60
61 void git_set_argv_exec_path(const char *exec_path)
62 {
63 argv_exec_path = exec_path;
64 }
65
66
67 /* Returns the highest-priority, location to look for git programs. */
68 const char *git_exec_path(void)
69 {
70 const char *env;
71
72 if (argv_exec_path)
73 return argv_exec_path;
74
75 env = getenv(EXEC_PATH_ENVIRONMENT);
76 if (env && *env) {
77 return env;
78 }
79
80 return system_path(GIT_EXEC_PATH);
81 }
82
83 static void add_path(struct strbuf *out, const char *path)
84 {
85 if (path && *path) {
86 if (is_absolute_path(path))
87 strbuf_addstr(out, path);
88 else
89 strbuf_addstr(out, make_nonrelative_path(path));
90
91 strbuf_addch(out, PATH_SEP);
92 }
93 }
94
95 void setup_path(void)
96 {
97 const char *old_path = getenv("PATH");
98 struct strbuf new_path = STRBUF_INIT;
99
100 add_path(&new_path, git_exec_path());
101 add_path(&new_path, argv0_path);
102
103 if (old_path)
104 strbuf_addstr(&new_path, old_path);
105 else
106 strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
107
108 setenv("PATH", new_path.buf, 1);
109
110 strbuf_release(&new_path);
111 }
112
113 const char **prepare_git_cmd(const char **argv)
114 {
115 int argc;
116 const char **nargv;
117
118 for (argc = 0; argv[argc]; argc++)
119 ; /* just counting */
120 nargv = xmalloc(sizeof(*nargv) * (argc + 2));
121
122 nargv[0] = "git";
123 for (argc = 0; argv[argc]; argc++)
124 nargv[argc + 1] = argv[argc];
125 nargv[argc + 1] = NULL;
126 return nargv;
127 }
128
129 int execv_git_cmd(const char **argv) {
130 const char **nargv = prepare_git_cmd(argv);
131 trace_argv_printf(nargv, "trace: exec:");
132
133 /* execvp() can only ever return if it fails */
134 execvp("git", (char **)nargv);
135
136 trace_printf("trace: exec failed: %s\n", strerror(errno));
137
138 free(nargv);
139 return -1;
140 }
141
142
143 int execl_git_cmd(const char *cmd,...)
144 {
145 int argc;
146 const char *argv[MAX_ARGS + 1];
147 const char *arg;
148 va_list param;
149
150 va_start(param, cmd);
151 argv[0] = cmd;
152 argc = 1;
153 while (argc < MAX_ARGS) {
154 arg = argv[argc++] = va_arg(param, char *);
155 if (!arg)
156 break;
157 }
158 va_end(param);
159 if (MAX_ARGS <= argc)
160 return error("too many args to run %s", cmd);
161
162 argv[argc] = NULL;
163 return execv_git_cmd(argv);
164 }