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1 | #include "cache.h" | |
2 | #include "exec-cmd.h" | |
3 | #include "quote.h" | |
4 | #include "argv-array.h" | |
5 | ||
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); | |
23 | ||
24 | #ifdef RUNTIME_PREFIX | |
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; | |
39 | ||
40 | static const char *system_prefix(void) | |
41 | { | |
42 | static const char *prefix; | |
43 | ||
44 | assert(executable_dirname); | |
45 | assert(is_absolute_path(executable_dirname)); | |
46 | ||
47 | if (!prefix && | |
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"))) { | |
51 | prefix = FALLBACK_RUNTIME_PREFIX; | |
52 | trace_printf("RUNTIME_PREFIX requested, " | |
53 | "but prefix computation failed. " | |
54 | "Using static fallback '%s'.\n", prefix); | |
55 | } | |
56 | return prefix; | |
57 | } | |
58 | ||
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) | |
65 | { | |
66 | const char *slash; | |
67 | ||
68 | if (!argv0 || !*argv0) | |
69 | return -1; | |
70 | ||
71 | slash = find_last_dir_sep(argv0); | |
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 | } | |
80 | ||
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 | ||
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 | ||
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 | ||
199 | #ifdef HAVE_WPGMPTR | |
200 | git_get_exec_path_wpgmptr(buf) && | |
201 | #endif /* HAVE_WPGMPTR */ | |
202 | ||
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 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | void git_resolve_executable_dir(const char *argv0) | |
216 | { | |
217 | struct strbuf buf = STRBUF_INIT; | |
218 | char *resolved; | |
219 | const char *slash; | |
220 | ||
221 | if (git_get_exec_path(&buf, argv0)) { | |
222 | trace_printf( | |
223 | "trace: could not determine executable path from: %s\n", | |
224 | argv0); | |
225 | strbuf_release(&buf); | |
226 | return; | |
227 | } | |
228 | ||
229 | resolved = strbuf_detach(&buf, NULL); | |
230 | slash = find_last_dir_sep(resolved); | |
231 | if (slash) | |
232 | resolved[slash - resolved] = '\0'; | |
233 | ||
234 | executable_dirname = resolved; | |
235 | trace_printf("trace: resolved executable dir: %s\n", | |
236 | executable_dirname); | |
237 | } | |
238 | ||
239 | #else | |
240 | ||
241 | /* | |
242 | * When not using a runtime prefix, Git uses a hard-coded path. | |
243 | */ | |
244 | static const char *system_prefix(void) | |
245 | { | |
246 | return FALLBACK_RUNTIME_PREFIX; | |
247 | } | |
248 | ||
249 | /* | |
250 | * This is called during initialization, but No work needs to be done here when | |
251 | * runtime prefix is not being used. | |
252 | */ | |
253 | void git_resolve_executable_dir(const char *argv0) | |
254 | { | |
255 | } | |
256 | ||
257 | #endif /* RUNTIME_PREFIX */ | |
258 | ||
259 | char *system_path(const char *path) | |
260 | { | |
261 | struct strbuf d = STRBUF_INIT; | |
262 | ||
263 | if (is_absolute_path(path)) | |
264 | return xstrdup(path); | |
265 | ||
266 | strbuf_addf(&d, "%s/%s", system_prefix(), path); | |
267 | return strbuf_detach(&d, NULL); | |
268 | } | |
269 | ||
270 | static const char *exec_path_value; | |
271 | ||
272 | void git_set_exec_path(const char *exec_path) | |
273 | { | |
274 | exec_path_value = exec_path; | |
275 | /* | |
276 | * Propagate this setting to external programs. | |
277 | */ | |
278 | setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1); | |
279 | } | |
280 | ||
281 | /* Returns the highest-priority location to look for git programs. */ | |
282 | const char *git_exec_path(void) | |
283 | { | |
284 | if (!exec_path_value) { | |
285 | const char *env = getenv(EXEC_PATH_ENVIRONMENT); | |
286 | if (env && *env) | |
287 | exec_path_value = xstrdup(env); | |
288 | else | |
289 | exec_path_value = system_path(GIT_EXEC_PATH); | |
290 | } | |
291 | return exec_path_value; | |
292 | } | |
293 | ||
294 | static void add_path(struct strbuf *out, const char *path) | |
295 | { | |
296 | if (path && *path) { | |
297 | strbuf_add_absolute_path(out, path); | |
298 | strbuf_addch(out, PATH_SEP); | |
299 | } | |
300 | } | |
301 | ||
302 | void setup_path(void) | |
303 | { | |
304 | const char *exec_path = git_exec_path(); | |
305 | const char *old_path = getenv("PATH"); | |
306 | struct strbuf new_path = STRBUF_INIT; | |
307 | ||
308 | git_set_exec_path(exec_path); | |
309 | add_path(&new_path, exec_path); | |
310 | ||
311 | if (old_path) | |
312 | strbuf_addstr(&new_path, old_path); | |
313 | else | |
314 | strbuf_addstr(&new_path, _PATH_DEFPATH); | |
315 | ||
316 | setenv("PATH", new_path.buf, 1); | |
317 | ||
318 | strbuf_release(&new_path); | |
319 | } | |
320 | ||
321 | const char **prepare_git_cmd(struct argv_array *out, const char **argv) | |
322 | { | |
323 | argv_array_push(out, "git"); | |
324 | argv_array_pushv(out, argv); | |
325 | return out->argv; | |
326 | } | |
327 | ||
328 | int execv_git_cmd(const char **argv) | |
329 | { | |
330 | struct argv_array nargv = ARGV_ARRAY_INIT; | |
331 | ||
332 | prepare_git_cmd(&nargv, argv); | |
333 | trace_argv_printf(nargv.argv, "trace: exec:"); | |
334 | ||
335 | /* execvp() can only ever return if it fails */ | |
336 | sane_execvp("git", (char **)nargv.argv); | |
337 | ||
338 | trace_printf("trace: exec failed: %s\n", strerror(errno)); | |
339 | ||
340 | argv_array_clear(&nargv); | |
341 | return -1; | |
342 | } | |
343 | ||
344 | int execl_git_cmd(const char *cmd, ...) | |
345 | { | |
346 | int argc; | |
347 | const char *argv[MAX_ARGS + 1]; | |
348 | const char *arg; | |
349 | va_list param; | |
350 | ||
351 | va_start(param, cmd); | |
352 | argv[0] = cmd; | |
353 | argc = 1; | |
354 | while (argc < MAX_ARGS) { | |
355 | arg = argv[argc++] = va_arg(param, char *); | |
356 | if (!arg) | |
357 | break; | |
358 | } | |
359 | va_end(param); | |
360 | if (MAX_ARGS <= argc) | |
361 | return error(_("too many args to run %s"), cmd); | |
362 | ||
363 | argv[argc] = NULL; | |
364 | return execv_git_cmd(argv); | |
365 | } |