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Commit | Line | Data |
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77cb17e9 | 1 | #include "cache.h" |
d807c4a0 | 2 | #include "exec-cmd.h" |
575ba9d6 | 3 | #include "quote.h" |
dbbcd44f | 4 | #include "strvec.h" |
77cb17e9 | 5 | |
226c0ddd DJ |
6 | #if defined(RUNTIME_PREFIX) |
7 | ||
8 | #if defined(HAVE_NS_GET_EXECUTABLE_PATH) | |
9 | #include <mach-o/dyld.h> | |
10 | #endif | |
11 | ||
12 | #if defined(HAVE_BSD_KERN_PROC_SYSCTL) | |
13 | #include <sys/param.h> | |
14 | #include <sys/types.h> | |
15 | #include <sys/sysctl.h> | |
16 | #endif | |
17 | ||
18 | #endif /* RUNTIME_PREFIX */ | |
19 | ||
20 | #define MAX_ARGS 32 | |
21 | ||
22 | static const char *system_prefix(void); | |
77cb17e9 | 23 | |
35fb0e86 | 24 | #ifdef RUNTIME_PREFIX |
226c0ddd DJ |
25 | |
26 | /** | |
27 | * When using a runtime prefix, Git dynamically resolves paths relative to its | |
28 | * executable. | |
29 | * | |
30 | * The method for determining the path of the executable is highly | |
31 | * platform-specific. | |
32 | */ | |
33 | ||
34 | /** | |
35 | * Path to the current Git executable. Resolved on startup by | |
36 | * 'git_resolve_executable_dir'. | |
37 | */ | |
38 | static const char *executable_dirname; | |
026fa0d5 | 39 | |
39b2f6af JK |
40 | static const char *system_prefix(void) |
41 | { | |
42 | static const char *prefix; | |
026fa0d5 | 43 | |
226c0ddd DJ |
44 | assert(executable_dirname); |
45 | assert(is_absolute_path(executable_dirname)); | |
35fb0e86 | 46 | |
024aa7d8 | 47 | if (!prefix && |
226c0ddd DJ |
48 | !(prefix = strip_path_suffix(executable_dirname, GIT_EXEC_PATH)) && |
49 | !(prefix = strip_path_suffix(executable_dirname, BINDIR)) && | |
50 | !(prefix = strip_path_suffix(executable_dirname, "git"))) { | |
4d5b4c24 | 51 | prefix = FALLBACK_RUNTIME_PREFIX; |
aa094570 | 52 | trace_printf("RUNTIME_PREFIX requested, " |
35fb0e86 SP |
53 | "but prefix computation failed. " |
54 | "Using static fallback '%s'.\n", prefix); | |
55 | } | |
39b2f6af JK |
56 | return prefix; |
57 | } | |
c1bb33c9 | 58 | |
226c0ddd DJ |
59 | /* |
60 | * Resolves the executable path from argv[0], only if it is absolute. | |
61 | * | |
62 | * Returns 0 on success, -1 on failure. | |
63 | */ | |
64 | static int git_get_exec_path_from_argv0(struct strbuf *buf, const char *argv0) | |
c1bb33c9 JK |
65 | { |
66 | const char *slash; | |
67 | ||
68 | if (!argv0 || !*argv0) | |
226c0ddd | 69 | return -1; |
c1bb33c9 JK |
70 | |
71 | slash = find_last_dir_sep(argv0); | |
226c0ddd DJ |
72 | if (slash) { |
73 | trace_printf("trace: resolved executable path from argv0: %s\n", | |
74 | argv0); | |
75 | strbuf_add_absolute_path(buf, argv0); | |
76 | return 0; | |
77 | } | |
78 | return -1; | |
79 | } | |
c1bb33c9 | 80 | |
226c0ddd DJ |
81 | #ifdef PROCFS_EXECUTABLE_PATH |
82 | /* | |
83 | * Resolves the executable path by examining a procfs symlink. | |
84 | * | |
85 | * Returns 0 on success, -1 on failure. | |
86 | */ | |
87 | static int git_get_exec_path_procfs(struct strbuf *buf) | |
88 | { | |
89 | if (strbuf_realpath(buf, PROCFS_EXECUTABLE_PATH, 0)) { | |
90 | trace_printf( | |
91 | "trace: resolved executable path from procfs: %s\n", | |
92 | buf->buf); | |
93 | return 0; | |
94 | } | |
95 | return -1; | |
96 | } | |
97 | #endif /* PROCFS_EXECUTABLE_PATH */ | |
98 | ||
99 | #ifdef HAVE_BSD_KERN_PROC_SYSCTL | |
100 | /* | |
101 | * Resolves the executable path using KERN_PROC_PATHNAME BSD sysctl. | |
102 | * | |
103 | * Returns 0 on success, -1 on failure. | |
104 | */ | |
105 | static int git_get_exec_path_bsd_sysctl(struct strbuf *buf) | |
106 | { | |
107 | int mib[4]; | |
108 | char path[MAXPATHLEN]; | |
109 | size_t cb = sizeof(path); | |
110 | ||
111 | mib[0] = CTL_KERN; | |
112 | mib[1] = KERN_PROC; | |
113 | mib[2] = KERN_PROC_PATHNAME; | |
114 | mib[3] = -1; | |
115 | if (!sysctl(mib, 4, path, &cb, NULL, 0)) { | |
116 | trace_printf( | |
117 | "trace: resolved executable path from sysctl: %s\n", | |
118 | path); | |
119 | strbuf_addstr(buf, path); | |
120 | return 0; | |
121 | } | |
122 | return -1; | |
123 | } | |
124 | #endif /* HAVE_BSD_KERN_PROC_SYSCTL */ | |
125 | ||
126 | #ifdef HAVE_NS_GET_EXECUTABLE_PATH | |
127 | /* | |
128 | * Resolves the executable path by querying Darwin application stack. | |
129 | * | |
130 | * Returns 0 on success, -1 on failure. | |
131 | */ | |
132 | static int git_get_exec_path_darwin(struct strbuf *buf) | |
133 | { | |
134 | char path[PATH_MAX]; | |
135 | uint32_t size = sizeof(path); | |
136 | if (!_NSGetExecutablePath(path, &size)) { | |
137 | trace_printf( | |
138 | "trace: resolved executable path from Darwin stack: %s\n", | |
139 | path); | |
140 | strbuf_addstr(buf, path); | |
141 | return 0; | |
142 | } | |
143 | return -1; | |
144 | } | |
145 | #endif /* HAVE_NS_GET_EXECUTABLE_PATH */ | |
146 | ||
c1be1cb7 JS |
147 | #ifdef HAVE_WPGMPTR |
148 | /* | |
149 | * Resolves the executable path by using the global variable _wpgmptr. | |
150 | * | |
151 | * Returns 0 on success, -1 on failure. | |
152 | */ | |
153 | static int git_get_exec_path_wpgmptr(struct strbuf *buf) | |
154 | { | |
155 | int len = wcslen(_wpgmptr) * 3 + 1; | |
156 | strbuf_grow(buf, len); | |
157 | len = xwcstoutf(buf->buf, _wpgmptr, len); | |
158 | if (len < 0) | |
159 | return -1; | |
160 | buf->len += len; | |
161 | return 0; | |
162 | } | |
163 | #endif /* HAVE_WPGMPTR */ | |
164 | ||
226c0ddd DJ |
165 | /* |
166 | * Resolves the absolute path of the current executable. | |
167 | * | |
168 | * Returns 0 on success, -1 on failure. | |
169 | */ | |
170 | static int git_get_exec_path(struct strbuf *buf, const char *argv0) | |
171 | { | |
172 | /* | |
173 | * Identifying the executable path is operating system specific. | |
174 | * Selectively employ all available methods in order of preference, | |
175 | * preferring highly-available authoritative methods over | |
176 | * selectively-available or non-authoritative methods. | |
177 | * | |
178 | * All cases fall back on resolving against argv[0] if there isn't a | |
179 | * better functional method. However, note that argv[0] can be | |
180 | * used-supplied on many operating systems, and is not authoritative | |
181 | * in those cases. | |
182 | * | |
183 | * Each of these functions returns 0 on success, so evaluation will stop | |
184 | * after the first successful method. | |
185 | */ | |
186 | if ( | |
187 | #ifdef HAVE_BSD_KERN_PROC_SYSCTL | |
188 | git_get_exec_path_bsd_sysctl(buf) && | |
189 | #endif /* HAVE_BSD_KERN_PROC_SYSCTL */ | |
190 | ||
191 | #ifdef HAVE_NS_GET_EXECUTABLE_PATH | |
192 | git_get_exec_path_darwin(buf) && | |
193 | #endif /* HAVE_NS_GET_EXECUTABLE_PATH */ | |
194 | ||
195 | #ifdef PROCFS_EXECUTABLE_PATH | |
196 | git_get_exec_path_procfs(buf) && | |
197 | #endif /* PROCFS_EXECUTABLE_PATH */ | |
198 | ||
c1be1cb7 JS |
199 | #ifdef HAVE_WPGMPTR |
200 | git_get_exec_path_wpgmptr(buf) && | |
201 | #endif /* HAVE_WPGMPTR */ | |
202 | ||
226c0ddd DJ |
203 | git_get_exec_path_from_argv0(buf, argv0)) { |
204 | return -1; | |
205 | } | |
206 | ||
207 | if (strbuf_normalize_path(buf)) { | |
208 | trace_printf("trace: could not normalize path: %s\n", buf->buf); | |
209 | return -1; | |
210 | } | |
211 | ||
ee4512ed JH |
212 | trace2_cmd_path(buf->buf); |
213 | ||
226c0ddd DJ |
214 | return 0; |
215 | } | |
c1bb33c9 | 216 | |
226c0ddd DJ |
217 | void git_resolve_executable_dir(const char *argv0) |
218 | { | |
219 | struct strbuf buf = STRBUF_INIT; | |
220 | char *resolved; | |
221 | const char *slash; | |
222 | ||
223 | if (git_get_exec_path(&buf, argv0)) { | |
224 | trace_printf( | |
225 | "trace: could not determine executable path from: %s\n", | |
226 | argv0); | |
227 | strbuf_release(&buf); | |
228 | return; | |
229 | } | |
230 | ||
231 | resolved = strbuf_detach(&buf, NULL); | |
232 | slash = find_last_dir_sep(resolved); | |
c1bb33c9 | 233 | if (slash) |
226c0ddd DJ |
234 | resolved[slash - resolved] = '\0'; |
235 | ||
236 | executable_dirname = resolved; | |
237 | trace_printf("trace: resolved executable dir: %s\n", | |
238 | executable_dirname); | |
c1bb33c9 JK |
239 | } |
240 | ||
39b2f6af JK |
241 | #else |
242 | ||
226c0ddd DJ |
243 | /* |
244 | * When not using a runtime prefix, Git uses a hard-coded path. | |
245 | */ | |
39b2f6af JK |
246 | static const char *system_prefix(void) |
247 | { | |
4d5b4c24 | 248 | return FALLBACK_RUNTIME_PREFIX; |
39b2f6af JK |
249 | } |
250 | ||
226c0ddd DJ |
251 | /* |
252 | * This is called during initialization, but No work needs to be done here when | |
253 | * runtime prefix is not being used. | |
254 | */ | |
255 | void git_resolve_executable_dir(const char *argv0) | |
c1bb33c9 JK |
256 | { |
257 | } | |
258 | ||
39b2f6af JK |
259 | #endif /* RUNTIME_PREFIX */ |
260 | ||
261 | char *system_path(const char *path) | |
262 | { | |
263 | struct strbuf d = STRBUF_INIT; | |
264 | ||
265 | if (is_absolute_path(path)) | |
266 | return xstrdup(path); | |
35fb0e86 | 267 | |
39b2f6af | 268 | strbuf_addf(&d, "%s/%s", system_prefix(), path); |
59362e56 | 269 | return strbuf_detach(&d, NULL); |
2de9de5e SP |
270 | } |
271 | ||
226c0ddd DJ |
272 | static const char *exec_path_value; |
273 | ||
274 | void git_set_exec_path(const char *exec_path) | |
77cb17e9 | 275 | { |
226c0ddd | 276 | exec_path_value = exec_path; |
c90d565a JS |
277 | /* |
278 | * Propagate this setting to external programs. | |
279 | */ | |
280 | setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1); | |
77cb17e9 MO |
281 | } |
282 | ||
226c0ddd | 283 | /* Returns the highest-priority location to look for git programs. */ |
962554c6 | 284 | const char *git_exec_path(void) |
77cb17e9 | 285 | { |
226c0ddd | 286 | if (!exec_path_value) { |
007ac544 JK |
287 | const char *env = getenv(EXEC_PATH_ENVIRONMENT); |
288 | if (env && *env) | |
226c0ddd | 289 | exec_path_value = xstrdup(env); |
007ac544 | 290 | else |
226c0ddd | 291 | exec_path_value = system_path(GIT_EXEC_PATH); |
77cb17e9 | 292 | } |
226c0ddd | 293 | return exec_path_value; |
77cb17e9 MO |
294 | } |
295 | ||
511707d4 SP |
296 | static void add_path(struct strbuf *out, const char *path) |
297 | { | |
298 | if (path && *path) { | |
9610decf | 299 | strbuf_add_absolute_path(out, path); |
80ba074f | 300 | strbuf_addch(out, PATH_SEP); |
511707d4 SP |
301 | } |
302 | } | |
303 | ||
e1464ca7 | 304 | void setup_path(void) |
511707d4 | 305 | { |
226c0ddd | 306 | const char *exec_path = git_exec_path(); |
511707d4 | 307 | const char *old_path = getenv("PATH"); |
f285a2d7 | 308 | struct strbuf new_path = STRBUF_INIT; |
511707d4 | 309 | |
226c0ddd DJ |
310 | git_set_exec_path(exec_path); |
311 | add_path(&new_path, exec_path); | |
511707d4 SP |
312 | |
313 | if (old_path) | |
314 | strbuf_addstr(&new_path, old_path); | |
315 | else | |
cb6a22c0 | 316 | strbuf_addstr(&new_path, _PATH_DEFPATH); |
511707d4 SP |
317 | |
318 | setenv("PATH", new_path.buf, 1); | |
319 | ||
320 | strbuf_release(&new_path); | |
321 | } | |
77cb17e9 | 322 | |
ef8d7ac4 | 323 | const char **prepare_git_cmd(struct strvec *out, const char **argv) |
77cb17e9 | 324 | { |
ef8d7ac4 JK |
325 | strvec_push(out, "git"); |
326 | strvec_pushv(out, argv); | |
d70a9eb6 | 327 | return out->v; |
4933e5eb SP |
328 | } |
329 | ||
226c0ddd DJ |
330 | int execv_git_cmd(const char **argv) |
331 | { | |
ef8d7ac4 | 332 | struct strvec nargv = STRVEC_INIT; |
20574f55 JK |
333 | |
334 | prepare_git_cmd(&nargv, argv); | |
d70a9eb6 | 335 | trace_argv_printf(nargv.v, "trace: exec:"); |
575ba9d6 | 336 | |
511707d4 | 337 | /* execvp() can only ever return if it fails */ |
d70a9eb6 | 338 | sane_execvp("git", (char **)nargv.v); |
77cb17e9 | 339 | |
511707d4 | 340 | trace_printf("trace: exec failed: %s\n", strerror(errno)); |
575ba9d6 | 341 | |
ef8d7ac4 | 342 | strvec_clear(&nargv); |
511707d4 | 343 | return -1; |
77cb17e9 MO |
344 | } |
345 | ||
226c0ddd | 346 | int execl_git_cmd(const char *cmd, ...) |
77cb17e9 MO |
347 | { |
348 | int argc; | |
9201c707 JH |
349 | const char *argv[MAX_ARGS + 1]; |
350 | const char *arg; | |
77cb17e9 MO |
351 | va_list param; |
352 | ||
353 | va_start(param, cmd); | |
354 | argv[0] = cmd; | |
355 | argc = 1; | |
356 | while (argc < MAX_ARGS) { | |
357 | arg = argv[argc++] = va_arg(param, char *); | |
358 | if (!arg) | |
359 | break; | |
360 | } | |
361 | va_end(param); | |
362 | if (MAX_ARGS <= argc) | |
31a55e91 | 363 | return error(_("too many args to run %s"), cmd); |
77cb17e9 MO |
364 | |
365 | argv[argc] = NULL; | |
366 | return execv_git_cmd(argv); | |
367 | } |