system_path: move RUNTIME_PREFIX to a sub-function
[git/git.git] / exec_cmd.c
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1#include "cache.h"
2#include "exec_cmd.h"
575ba9d6 3#include "quote.h"
20574f55 4#include "argv-array.h"
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5#define MAX_ARGS 32
6
384df833 7static const char *argv_exec_path;
e1464ca7 8static const char *argv0_path;
77cb17e9 9
35fb0e86 10#ifdef RUNTIME_PREFIX
026fa0d5 11
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12static const char *system_prefix(void)
13{
14 static const char *prefix;
026fa0d5 15
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16 assert(argv0_path);
17 assert(is_absolute_path(argv0_path));
18
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19 if (!prefix &&
20 !(prefix = strip_path_suffix(argv0_path, GIT_EXEC_PATH)) &&
21 !(prefix = strip_path_suffix(argv0_path, BINDIR)) &&
22 !(prefix = strip_path_suffix(argv0_path, "git"))) {
35fb0e86 23 prefix = PREFIX;
aa094570 24 trace_printf("RUNTIME_PREFIX requested, "
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25 "but prefix computation failed. "
26 "Using static fallback '%s'.\n", prefix);
27 }
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28 return prefix;
29}
30#else
31
32static const char *system_prefix(void)
33{
34 return PREFIX;
35}
36
37#endif /* RUNTIME_PREFIX */
38
39char *system_path(const char *path)
40{
41 struct strbuf d = STRBUF_INIT;
42
43 if (is_absolute_path(path))
44 return xstrdup(path);
35fb0e86 45
39b2f6af 46 strbuf_addf(&d, "%s/%s", system_prefix(), path);
59362e56 47 return strbuf_detach(&d, NULL);
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48}
49
6854a8f5 50void git_extract_argv0_path(const char *argv0)
e1464ca7 51{
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52 const char *slash;
53
54 if (!argv0 || !*argv0)
6854a8f5 55 return;
4dd47c3b 56
f4598233 57 slash = find_last_dir_sep(argv0);
4dd47c3b 58
6854a8f5 59 if (slash)
4dd47c3b 60 argv0_path = xstrndup(argv0, slash - argv0);
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61}
62
384df833 63void git_set_argv_exec_path(const char *exec_path)
77cb17e9 64{
384df833 65 argv_exec_path = exec_path;
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66 /*
67 * Propagate this setting to external programs.
68 */
69 setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
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70}
71
72
73/* Returns the highest-priority, location to look for git programs. */
962554c6 74const char *git_exec_path(void)
77cb17e9 75{
007ac544 76 static char *cached_exec_path;
77cb17e9 77
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78 if (argv_exec_path)
79 return argv_exec_path;
77cb17e9 80
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81 if (!cached_exec_path) {
82 const char *env = getenv(EXEC_PATH_ENVIRONMENT);
83 if (env && *env)
84 cached_exec_path = xstrdup(env);
85 else
86 cached_exec_path = system_path(GIT_EXEC_PATH);
77cb17e9 87 }
007ac544 88 return cached_exec_path;
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89}
90
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91static void add_path(struct strbuf *out, const char *path)
92{
93 if (path && *path) {
9610decf 94 strbuf_add_absolute_path(out, path);
80ba074f 95 strbuf_addch(out, PATH_SEP);
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96 }
97}
98
e1464ca7 99void setup_path(void)
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100{
101 const char *old_path = getenv("PATH");
f285a2d7 102 struct strbuf new_path = STRBUF_INIT;
511707d4 103
8e346283 104 add_path(&new_path, git_exec_path());
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105
106 if (old_path)
107 strbuf_addstr(&new_path, old_path);
108 else
cb6a22c0 109 strbuf_addstr(&new_path, _PATH_DEFPATH);
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110
111 setenv("PATH", new_path.buf, 1);
112
113 strbuf_release(&new_path);
114}
77cb17e9 115
20574f55 116const char **prepare_git_cmd(struct argv_array *out, const char **argv)
77cb17e9 117{
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118 argv_array_push(out, "git");
119 argv_array_pushv(out, argv);
120 return out->argv;
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121}
122
123int execv_git_cmd(const char **argv) {
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124 struct argv_array nargv = ARGV_ARRAY_INIT;
125
126 prepare_git_cmd(&nargv, argv);
127 trace_argv_printf(nargv.argv, "trace: exec:");
575ba9d6 128
511707d4 129 /* execvp() can only ever return if it fails */
20574f55 130 sane_execvp("git", (char **)nargv.argv);
77cb17e9 131
511707d4 132 trace_printf("trace: exec failed: %s\n", strerror(errno));
575ba9d6 133
20574f55 134 argv_array_clear(&nargv);
511707d4 135 return -1;
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136}
137
138
9201c707 139int execl_git_cmd(const char *cmd,...)
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140{
141 int argc;
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142 const char *argv[MAX_ARGS + 1];
143 const char *arg;
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144 va_list param;
145
146 va_start(param, cmd);
147 argv[0] = cmd;
148 argc = 1;
149 while (argc < MAX_ARGS) {
150 arg = argv[argc++] = va_arg(param, char *);
151 if (!arg)
152 break;
153 }
154 va_end(param);
155 if (MAX_ARGS <= argc)
156 return error("too many args to run %s", cmd);
157
158 argv[argc] = NULL;
159 return execv_git_cmd(argv);
160}