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1 | #include "cache.h" | |
2 | #include "run-command.h" | |
3 | #include "exec_cmd.h" | |
4 | ||
5 | static inline void close_pair(int fd[2]) | |
6 | { | |
7 | close(fd[0]); | |
8 | close(fd[1]); | |
9 | } | |
10 | ||
11 | static inline void dup_devnull(int to) | |
12 | { | |
13 | int fd = open("/dev/null", O_RDWR); | |
14 | dup2(fd, to); | |
15 | close(fd); | |
16 | } | |
17 | ||
18 | int start_command(struct child_process *cmd) | |
19 | { | |
20 | int need_in, need_out, need_err; | |
21 | int fdin[2], fdout[2], fderr[2]; | |
22 | ||
23 | /* | |
24 | * In case of errors we must keep the promise to close FDs | |
25 | * that have been passed in via ->in and ->out. | |
26 | */ | |
27 | ||
28 | need_in = !cmd->no_stdin && cmd->in < 0; | |
29 | if (need_in) { | |
30 | if (pipe(fdin) < 0) { | |
31 | if (cmd->out > 0) | |
32 | close(cmd->out); | |
33 | return -ERR_RUN_COMMAND_PIPE; | |
34 | } | |
35 | cmd->in = fdin[1]; | |
36 | } | |
37 | ||
38 | need_out = !cmd->no_stdout | |
39 | && !cmd->stdout_to_stderr | |
40 | && cmd->out < 0; | |
41 | if (need_out) { | |
42 | if (pipe(fdout) < 0) { | |
43 | if (need_in) | |
44 | close_pair(fdin); | |
45 | else if (cmd->in) | |
46 | close(cmd->in); | |
47 | return -ERR_RUN_COMMAND_PIPE; | |
48 | } | |
49 | cmd->out = fdout[0]; | |
50 | } | |
51 | ||
52 | need_err = !cmd->no_stderr && cmd->err < 0; | |
53 | if (need_err) { | |
54 | if (pipe(fderr) < 0) { | |
55 | if (need_in) | |
56 | close_pair(fdin); | |
57 | else if (cmd->in) | |
58 | close(cmd->in); | |
59 | if (need_out) | |
60 | close_pair(fdout); | |
61 | else if (cmd->out) | |
62 | close(cmd->out); | |
63 | return -ERR_RUN_COMMAND_PIPE; | |
64 | } | |
65 | cmd->err = fderr[0]; | |
66 | } | |
67 | ||
68 | trace_argv_printf(cmd->argv, "trace: run_command:"); | |
69 | ||
70 | #ifndef __MINGW32__ | |
71 | fflush(NULL); | |
72 | cmd->pid = fork(); | |
73 | if (!cmd->pid) { | |
74 | if (cmd->no_stdin) | |
75 | dup_devnull(0); | |
76 | else if (need_in) { | |
77 | dup2(fdin[0], 0); | |
78 | close_pair(fdin); | |
79 | } else if (cmd->in) { | |
80 | dup2(cmd->in, 0); | |
81 | close(cmd->in); | |
82 | } | |
83 | ||
84 | if (cmd->no_stderr) | |
85 | dup_devnull(2); | |
86 | else if (need_err) { | |
87 | dup2(fderr[1], 2); | |
88 | close_pair(fderr); | |
89 | } | |
90 | ||
91 | if (cmd->no_stdout) | |
92 | dup_devnull(1); | |
93 | else if (cmd->stdout_to_stderr) | |
94 | dup2(2, 1); | |
95 | else if (need_out) { | |
96 | dup2(fdout[1], 1); | |
97 | close_pair(fdout); | |
98 | } else if (cmd->out > 1) { | |
99 | dup2(cmd->out, 1); | |
100 | close(cmd->out); | |
101 | } | |
102 | ||
103 | if (cmd->dir && chdir(cmd->dir)) | |
104 | die("exec %s: cd to %s failed (%s)", cmd->argv[0], | |
105 | cmd->dir, strerror(errno)); | |
106 | if (cmd->env) { | |
107 | for (; *cmd->env; cmd->env++) { | |
108 | if (strchr(*cmd->env, '=')) | |
109 | putenv((char*)*cmd->env); | |
110 | else | |
111 | unsetenv(*cmd->env); | |
112 | } | |
113 | } | |
114 | if (cmd->preexec_cb) | |
115 | cmd->preexec_cb(); | |
116 | if (cmd->git_cmd) { | |
117 | execv_git_cmd(cmd->argv); | |
118 | } else { | |
119 | execvp(cmd->argv[0], (char *const*) cmd->argv); | |
120 | } | |
121 | die("exec %s failed.", cmd->argv[0]); | |
122 | } | |
123 | #else | |
124 | int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */ | |
125 | const char **sargv = cmd->argv; | |
126 | char **env = environ; | |
127 | ||
128 | if (cmd->no_stdin) { | |
129 | s0 = dup(0); | |
130 | dup_devnull(0); | |
131 | } else if (need_in) { | |
132 | s0 = dup(0); | |
133 | dup2(fdin[0], 0); | |
134 | } else if (cmd->in) { | |
135 | s0 = dup(0); | |
136 | dup2(cmd->in, 0); | |
137 | } | |
138 | ||
139 | if (cmd->no_stderr) { | |
140 | s2 = dup(2); | |
141 | dup_devnull(2); | |
142 | } else if (need_err) { | |
143 | s2 = dup(2); | |
144 | dup2(fderr[1], 2); | |
145 | } | |
146 | ||
147 | if (cmd->no_stdout) { | |
148 | s1 = dup(1); | |
149 | dup_devnull(1); | |
150 | } else if (cmd->stdout_to_stderr) { | |
151 | s1 = dup(1); | |
152 | dup2(2, 1); | |
153 | } else if (need_out) { | |
154 | s1 = dup(1); | |
155 | dup2(fdout[1], 1); | |
156 | } else if (cmd->out > 1) { | |
157 | s1 = dup(1); | |
158 | dup2(cmd->out, 1); | |
159 | } | |
160 | ||
161 | if (cmd->dir) | |
162 | die("chdir in start_command() not implemented"); | |
163 | if (cmd->env) { | |
164 | env = copy_environ(); | |
165 | for (; *cmd->env; cmd->env++) | |
166 | env = env_setenv(env, *cmd->env); | |
167 | } | |
168 | ||
169 | if (cmd->git_cmd) { | |
170 | cmd->argv = prepare_git_cmd(cmd->argv); | |
171 | } | |
172 | ||
173 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env); | |
174 | ||
175 | if (cmd->env) | |
176 | free_environ(env); | |
177 | if (cmd->git_cmd) | |
178 | free(cmd->argv); | |
179 | ||
180 | cmd->argv = sargv; | |
181 | if (s0 >= 0) | |
182 | dup2(s0, 0), close(s0); | |
183 | if (s1 >= 0) | |
184 | dup2(s1, 1), close(s1); | |
185 | if (s2 >= 0) | |
186 | dup2(s2, 2), close(s2); | |
187 | #endif | |
188 | ||
189 | if (cmd->pid < 0) { | |
190 | if (need_in) | |
191 | close_pair(fdin); | |
192 | else if (cmd->in) | |
193 | close(cmd->in); | |
194 | if (need_out) | |
195 | close_pair(fdout); | |
196 | else if (cmd->out) | |
197 | close(cmd->out); | |
198 | if (need_err) | |
199 | close_pair(fderr); | |
200 | return -ERR_RUN_COMMAND_FORK; | |
201 | } | |
202 | ||
203 | if (need_in) | |
204 | close(fdin[0]); | |
205 | else if (cmd->in) | |
206 | close(cmd->in); | |
207 | ||
208 | if (need_out) | |
209 | close(fdout[1]); | |
210 | else if (cmd->out) | |
211 | close(cmd->out); | |
212 | ||
213 | if (need_err) | |
214 | close(fderr[1]); | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | static int wait_or_whine(pid_t pid) | |
220 | { | |
221 | for (;;) { | |
222 | int status, code; | |
223 | pid_t waiting = waitpid(pid, &status, 0); | |
224 | ||
225 | if (waiting < 0) { | |
226 | if (errno == EINTR) | |
227 | continue; | |
228 | error("waitpid failed (%s)", strerror(errno)); | |
229 | return -ERR_RUN_COMMAND_WAITPID; | |
230 | } | |
231 | if (waiting != pid) | |
232 | return -ERR_RUN_COMMAND_WAITPID_WRONG_PID; | |
233 | if (WIFSIGNALED(status)) | |
234 | return -ERR_RUN_COMMAND_WAITPID_SIGNAL; | |
235 | ||
236 | if (!WIFEXITED(status)) | |
237 | return -ERR_RUN_COMMAND_WAITPID_NOEXIT; | |
238 | code = WEXITSTATUS(status); | |
239 | if (code) | |
240 | return -code; | |
241 | return 0; | |
242 | } | |
243 | } | |
244 | ||
245 | int finish_command(struct child_process *cmd) | |
246 | { | |
247 | return wait_or_whine(cmd->pid); | |
248 | } | |
249 | ||
250 | int run_command(struct child_process *cmd) | |
251 | { | |
252 | int code = start_command(cmd); | |
253 | if (code) | |
254 | return code; | |
255 | return finish_command(cmd); | |
256 | } | |
257 | ||
258 | static void prepare_run_command_v_opt(struct child_process *cmd, | |
259 | const char **argv, | |
260 | int opt) | |
261 | { | |
262 | memset(cmd, 0, sizeof(*cmd)); | |
263 | cmd->argv = argv; | |
264 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
265 | cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
266 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
267 | } | |
268 | ||
269 | int run_command_v_opt(const char **argv, int opt) | |
270 | { | |
271 | struct child_process cmd; | |
272 | prepare_run_command_v_opt(&cmd, argv, opt); | |
273 | return run_command(&cmd); | |
274 | } | |
275 | ||
276 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) | |
277 | { | |
278 | struct child_process cmd; | |
279 | prepare_run_command_v_opt(&cmd, argv, opt); | |
280 | cmd.dir = dir; | |
281 | cmd.env = env; | |
282 | return run_command(&cmd); | |
283 | } | |
284 | ||
285 | #ifdef __MINGW32__ | |
286 | static __stdcall unsigned run_thread(void *data) | |
287 | { | |
288 | struct async *async = data; | |
289 | return async->proc(async->fd_for_proc, async->data); | |
290 | } | |
291 | #endif | |
292 | ||
293 | int start_async(struct async *async) | |
294 | { | |
295 | int pipe_out[2]; | |
296 | ||
297 | if (pipe(pipe_out) < 0) | |
298 | return error("cannot create pipe: %s", strerror(errno)); | |
299 | async->out = pipe_out[0]; | |
300 | ||
301 | #ifndef __MINGW32__ | |
302 | /* Flush stdio before fork() to avoid cloning buffers */ | |
303 | fflush(NULL); | |
304 | ||
305 | async->pid = fork(); | |
306 | if (async->pid < 0) { | |
307 | error("fork (async) failed: %s", strerror(errno)); | |
308 | close_pair(pipe_out); | |
309 | return -1; | |
310 | } | |
311 | if (!async->pid) { | |
312 | close(pipe_out[0]); | |
313 | exit(!!async->proc(pipe_out[1], async->data)); | |
314 | } | |
315 | close(pipe_out[1]); | |
316 | #else | |
317 | async->fd_for_proc = pipe_out[1]; | |
318 | async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL); | |
319 | if (!async->tid) { | |
320 | error("cannot create thread: %s", strerror(errno)); | |
321 | close_pair(pipe_out); | |
322 | return -1; | |
323 | } | |
324 | #endif | |
325 | return 0; | |
326 | } | |
327 | ||
328 | int finish_async(struct async *async) | |
329 | { | |
330 | #ifndef __MINGW32__ | |
331 | int ret = 0; | |
332 | ||
333 | if (wait_or_whine(async->pid)) | |
334 | ret = error("waitpid (async) failed"); | |
335 | #else | |
336 | DWORD ret = 0; | |
337 | if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0) | |
338 | ret = error("waiting for thread failed: %lu", GetLastError()); | |
339 | else if (!GetExitCodeThread(async->tid, &ret)) | |
340 | ret = error("cannot get thread exit code: %lu", GetLastError()); | |
341 | CloseHandle(async->tid); | |
342 | #endif | |
343 | return ret; | |
344 | } | |
345 | ||
346 | int run_hook(const char *index_file, const char *name, ...) | |
347 | { | |
348 | struct child_process hook; | |
349 | const char *argv[10], *env[2]; | |
350 | char index[PATH_MAX]; | |
351 | va_list args; | |
352 | int ret; | |
353 | int i; | |
354 | ||
355 | va_start(args, name); | |
356 | argv[0] = git_path("hooks/%s", name); | |
357 | i = 0; | |
358 | do { | |
359 | if (++i >= ARRAY_SIZE(argv)) | |
360 | die("run_hook(): too many arguments"); | |
361 | argv[i] = va_arg(args, const char *); | |
362 | } while (argv[i]); | |
363 | va_end(args); | |
364 | ||
365 | if (access(argv[0], X_OK) < 0) | |
366 | return 0; | |
367 | ||
368 | memset(&hook, 0, sizeof(hook)); | |
369 | hook.argv = argv; | |
370 | hook.no_stdin = 1; | |
371 | hook.stdout_to_stderr = 1; | |
372 | if (index_file) { | |
373 | snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file); | |
374 | env[0] = index; | |
375 | env[1] = NULL; | |
376 | hook.env = env; | |
377 | } | |
378 | ||
379 | ret = start_command(&hook); | |
380 | if (ret) { | |
381 | warning("Could not spawn %s", argv[0]); | |
382 | return ret; | |
383 | } | |
384 | ret = finish_command(&hook); | |
385 | if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL) | |
386 | warning("%s exited due to uncaught signal", argv[0]); | |
387 | ||
388 | return ret; | |
389 | } |