Introduce the function strip_path_suffix()
[git/git.git] / exec_cmd.c
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1#include "cache.h"
2#include "exec_cmd.h"
575ba9d6 3#include "quote.h"
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4#define MAX_ARGS 32
5
6extern char **environ;
384df833 7static const char *argv_exec_path;
e1464ca7 8static const char *argv0_path;
77cb17e9 9
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10const char *system_path(const char *path)
11{
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12#ifdef RUNTIME_PREFIX
13 static const char *prefix;
14#else
026fa0d5 15 static const char *prefix = PREFIX;
35fb0e86 16#endif
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17 struct strbuf d = STRBUF_INIT;
18
19 if (is_absolute_path(path))
20 return path;
21
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22#ifdef RUNTIME_PREFIX
23 assert(argv0_path);
24 assert(is_absolute_path(argv0_path));
25
26 if (!prefix) {
27 const char *strip[] = {
28 GIT_EXEC_PATH,
29 BINDIR,
30 0
31 };
32 const char **s;
33
34 for (s = strip; *s; s++) {
35 const char *sargv = argv0_path + strlen(argv0_path);
36 const char *ss = *s + strlen(*s);
37 while (argv0_path < sargv && *s < ss
38 && (*sargv == *ss ||
39 (is_dir_sep(*sargv) && is_dir_sep(*ss)))) {
40 sargv--;
41 ss--;
42 }
43 if (*s == ss) {
44 struct strbuf d = STRBUF_INIT;
45 /* We also skip the trailing directory separator. */
46 assert(sargv - argv0_path - 1 >= 0);
47 strbuf_add(&d, argv0_path, sargv - argv0_path - 1);
48 prefix = strbuf_detach(&d, NULL);
49 break;
50 }
51 }
52 }
53
54 if (!prefix) {
55 prefix = PREFIX;
56 fprintf(stderr, "RUNTIME_PREFIX requested, "
57 "but prefix computation failed. "
58 "Using static fallback '%s'.\n", prefix);
59 }
60#endif
61
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62 strbuf_addf(&d, "%s/%s", prefix, path);
63 path = strbuf_detach(&d, NULL);
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64 return path;
65}
66
4dd47c3b 67const char *git_extract_argv0_path(const char *argv0)
e1464ca7 68{
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69 const char *slash;
70
71 if (!argv0 || !*argv0)
72 return NULL;
73 slash = argv0 + strlen(argv0);
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74
75 while (argv0 <= slash && !is_dir_sep(*slash))
76 slash--;
77
78 if (slash >= argv0) {
79 argv0_path = xstrndup(argv0, slash - argv0);
80 return slash + 1;
81 }
82
83 return argv0;
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84}
85
384df833 86void git_set_argv_exec_path(const char *exec_path)
77cb17e9 87{
384df833 88 argv_exec_path = exec_path;
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89}
90
91
92/* Returns the highest-priority, location to look for git programs. */
962554c6 93const char *git_exec_path(void)
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94{
95 const char *env;
96
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97 if (argv_exec_path)
98 return argv_exec_path;
77cb17e9 99
d4ebc36c 100 env = getenv(EXEC_PATH_ENVIRONMENT);
2b601626 101 if (env && *env) {
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102 return env;
103 }
104
49fa65a7 105 return system_path(GIT_EXEC_PATH);
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106}
107
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108static void add_path(struct strbuf *out, const char *path)
109{
110 if (path && *path) {
111 if (is_absolute_path(path))
112 strbuf_addstr(out, path);
113 else
10c4c881 114 strbuf_addstr(out, make_nonrelative_path(path));
511707d4 115
80ba074f 116 strbuf_addch(out, PATH_SEP);
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117 }
118}
119
e1464ca7 120void setup_path(void)
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121{
122 const char *old_path = getenv("PATH");
f285a2d7 123 struct strbuf new_path = STRBUF_INIT;
511707d4 124
8e346283 125 add_path(&new_path, git_exec_path());
e1464ca7 126 add_path(&new_path, argv0_path);
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127
128 if (old_path)
129 strbuf_addstr(&new_path, old_path);
130 else
131 strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
132
133 setenv("PATH", new_path.buf, 1);
134
135 strbuf_release(&new_path);
136}
77cb17e9 137
4933e5eb 138const char **prepare_git_cmd(const char **argv)
77cb17e9 139{
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140 int argc;
141 const char **nargv;
77cb17e9 142
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143 for (argc = 0; argv[argc]; argc++)
144 ; /* just counting */
145 nargv = xmalloc(sizeof(*nargv) * (argc + 2));
77cb17e9 146
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147 nargv[0] = "git";
148 for (argc = 0; argv[argc]; argc++)
149 nargv[argc + 1] = argv[argc];
150 nargv[argc + 1] = NULL;
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151 return nargv;
152}
153
154int execv_git_cmd(const char **argv) {
155 const char **nargv = prepare_git_cmd(argv);
7550be0a 156 trace_argv_printf(nargv, "trace: exec:");
575ba9d6 157
511707d4 158 /* execvp() can only ever return if it fails */
7550be0a 159 execvp("git", (char **)nargv);
77cb17e9 160
511707d4 161 trace_printf("trace: exec failed: %s\n", strerror(errno));
575ba9d6 162
7550be0a 163 free(nargv);
511707d4 164 return -1;
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165}
166
167
9201c707 168int execl_git_cmd(const char *cmd,...)
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169{
170 int argc;
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171 const char *argv[MAX_ARGS + 1];
172 const char *arg;
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173 va_list param;
174
175 va_start(param, cmd);
176 argv[0] = cmd;
177 argc = 1;
178 while (argc < MAX_ARGS) {
179 arg = argv[argc++] = va_arg(param, char *);
180 if (!arg)
181 break;
182 }
183 va_end(param);
184 if (MAX_ARGS <= argc)
185 return error("too many args to run %s", cmd);
186
187 argv[argc] = NULL;
188 return execv_git_cmd(argv);
189}