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Commit | Line | Data |
---|---|---|
b1bf95bb JW |
1 | #include "cache.h" |
2 | #include "run-command.h" | |
77cb17e9 | 3 | #include "exec_cmd.h" |
b1bf95bb | 4 | |
9dc09c76 SP |
5 | static inline void close_pair(int fd[2]) |
6 | { | |
7 | close(fd[0]); | |
8 | close(fd[1]); | |
9 | } | |
10 | ||
e4507ae8 SP |
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 | ||
ebcb5d16 | 18 | int start_command(struct child_process *cmd) |
b1bf95bb | 19 | { |
f3b33f1d JS |
20 | int need_in, need_out, need_err; |
21 | int fdin[2], fdout[2], fderr[2]; | |
0ac77ec3 | 22 | int failed_errno; |
4919bf03 | 23 | |
c20181e3 JS |
24 | /* |
25 | * In case of errors we must keep the promise to close FDs | |
26 | * that have been passed in via ->in and ->out. | |
27 | */ | |
28 | ||
e4507ae8 | 29 | need_in = !cmd->no_stdin && cmd->in < 0; |
4919bf03 | 30 | if (need_in) { |
c20181e3 | 31 | if (pipe(fdin) < 0) { |
0ac77ec3 | 32 | failed_errno = errno; |
c20181e3 JS |
33 | if (cmd->out > 0) |
34 | close(cmd->out); | |
0ac77ec3 | 35 | goto fail_pipe; |
c20181e3 | 36 | } |
4919bf03 | 37 | cmd->in = fdin[1]; |
4919bf03 SP |
38 | } |
39 | ||
e4507ae8 SP |
40 | need_out = !cmd->no_stdout |
41 | && !cmd->stdout_to_stderr | |
42 | && cmd->out < 0; | |
f4bba25b SP |
43 | if (need_out) { |
44 | if (pipe(fdout) < 0) { | |
0ac77ec3 | 45 | failed_errno = errno; |
f4bba25b SP |
46 | if (need_in) |
47 | close_pair(fdin); | |
c20181e3 JS |
48 | else if (cmd->in) |
49 | close(cmd->in); | |
0ac77ec3 | 50 | goto fail_pipe; |
f4bba25b SP |
51 | } |
52 | cmd->out = fdout[0]; | |
f4bba25b SP |
53 | } |
54 | ||
b73a4397 | 55 | need_err = !cmd->no_stderr && cmd->err < 0; |
f3b33f1d JS |
56 | if (need_err) { |
57 | if (pipe(fderr) < 0) { | |
0ac77ec3 | 58 | failed_errno = errno; |
f3b33f1d JS |
59 | if (need_in) |
60 | close_pair(fdin); | |
c20181e3 JS |
61 | else if (cmd->in) |
62 | close(cmd->in); | |
f3b33f1d JS |
63 | if (need_out) |
64 | close_pair(fdout); | |
c20181e3 JS |
65 | else if (cmd->out) |
66 | close(cmd->out); | |
0ac77ec3 JS |
67 | fail_pipe: |
68 | error("cannot create pipe for %s: %s", | |
69 | cmd->argv[0], strerror(failed_errno)); | |
70 | errno = failed_errno; | |
71 | return -1; | |
f3b33f1d JS |
72 | } |
73 | cmd->err = fderr[0]; | |
74 | } | |
75 | ||
8852f5d7 JS |
76 | trace_argv_printf(cmd->argv, "trace: run_command:"); |
77 | ||
ba26f296 | 78 | #ifndef __MINGW32__ |
7d0b18a4 | 79 | fflush(NULL); |
ebcb5d16 | 80 | cmd->pid = fork(); |
ebcb5d16 | 81 | if (!cmd->pid) { |
e4507ae8 SP |
82 | if (cmd->no_stdin) |
83 | dup_devnull(0); | |
84 | else if (need_in) { | |
4919bf03 | 85 | dup2(fdin[0], 0); |
9dc09c76 | 86 | close_pair(fdin); |
4919bf03 SP |
87 | } else if (cmd->in) { |
88 | dup2(cmd->in, 0); | |
89 | close(cmd->in); | |
95d3c4f5 | 90 | } |
4919bf03 | 91 | |
ce2cf27a CC |
92 | if (cmd->no_stderr) |
93 | dup_devnull(2); | |
94 | else if (need_err) { | |
95 | dup2(fderr[1], 2); | |
96 | close_pair(fderr); | |
97 | } | |
98 | ||
e4507ae8 SP |
99 | if (cmd->no_stdout) |
100 | dup_devnull(1); | |
101 | else if (cmd->stdout_to_stderr) | |
cd83c74c | 102 | dup2(2, 1); |
f4bba25b SP |
103 | else if (need_out) { |
104 | dup2(fdout[1], 1); | |
105 | close_pair(fdout); | |
106 | } else if (cmd->out > 1) { | |
107 | dup2(cmd->out, 1); | |
108 | close(cmd->out); | |
109 | } | |
110 | ||
1568fea0 AR |
111 | if (cmd->dir && chdir(cmd->dir)) |
112 | die("exec %s: cd to %s failed (%s)", cmd->argv[0], | |
113 | cmd->dir, strerror(errno)); | |
ee493148 | 114 | if (cmd->env) { |
3427b375 AR |
115 | for (; *cmd->env; cmd->env++) { |
116 | if (strchr(*cmd->env, '=')) | |
4b25d091 | 117 | putenv((char *)*cmd->env); |
3427b375 AR |
118 | else |
119 | unsetenv(*cmd->env); | |
120 | } | |
ee493148 | 121 | } |
ccf08bc3 JK |
122 | if (cmd->preexec_cb) |
123 | cmd->preexec_cb(); | |
f1000898 SP |
124 | if (cmd->git_cmd) { |
125 | execv_git_cmd(cmd->argv); | |
77cb17e9 | 126 | } else { |
f1000898 | 127 | execvp(cmd->argv[0], (char *const*) cmd->argv); |
128aed68 | 128 | } |
45c0961c JK |
129 | trace_printf("trace: exec '%s' failed: %s\n", cmd->argv[0], |
130 | strerror(errno)); | |
131 | exit(127); | |
b1bf95bb | 132 | } |
0ac77ec3 JS |
133 | if (cmd->pid < 0) |
134 | error("cannot fork() for %s: %s", cmd->argv[0], | |
135 | strerror(failed_errno = errno)); | |
ba26f296 JS |
136 | #else |
137 | int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */ | |
108ac313 | 138 | const char **sargv = cmd->argv; |
ba26f296 | 139 | char **env = environ; |
ba26f296 JS |
140 | |
141 | if (cmd->no_stdin) { | |
142 | s0 = dup(0); | |
143 | dup_devnull(0); | |
144 | } else if (need_in) { | |
145 | s0 = dup(0); | |
146 | dup2(fdin[0], 0); | |
147 | } else if (cmd->in) { | |
148 | s0 = dup(0); | |
149 | dup2(cmd->in, 0); | |
150 | } | |
151 | ||
152 | if (cmd->no_stderr) { | |
153 | s2 = dup(2); | |
154 | dup_devnull(2); | |
155 | } else if (need_err) { | |
156 | s2 = dup(2); | |
157 | dup2(fderr[1], 2); | |
158 | } | |
159 | ||
160 | if (cmd->no_stdout) { | |
161 | s1 = dup(1); | |
162 | dup_devnull(1); | |
163 | } else if (cmd->stdout_to_stderr) { | |
164 | s1 = dup(1); | |
165 | dup2(2, 1); | |
166 | } else if (need_out) { | |
167 | s1 = dup(1); | |
168 | dup2(fdout[1], 1); | |
169 | } else if (cmd->out > 1) { | |
170 | s1 = dup(1); | |
171 | dup2(cmd->out, 1); | |
172 | } | |
173 | ||
174 | if (cmd->dir) | |
175 | die("chdir in start_command() not implemented"); | |
176 | if (cmd->env) { | |
177 | env = copy_environ(); | |
178 | for (; *cmd->env; cmd->env++) | |
179 | env = env_setenv(env, *cmd->env); | |
180 | } | |
181 | ||
182 | if (cmd->git_cmd) { | |
108ac313 | 183 | cmd->argv = prepare_git_cmd(cmd->argv); |
ba26f296 JS |
184 | } |
185 | ||
7e5d7768 | 186 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env); |
0ac77ec3 JS |
187 | failed_errno = errno; |
188 | if (cmd->pid < 0 && errno != ENOENT) | |
189 | error("cannot spawn %s: %s", cmd->argv[0], strerror(errno)); | |
ba26f296 JS |
190 | |
191 | if (cmd->env) | |
192 | free_environ(env); | |
193 | if (cmd->git_cmd) | |
108ac313 | 194 | free(cmd->argv); |
ba26f296 | 195 | |
108ac313 | 196 | cmd->argv = sargv; |
ba26f296 JS |
197 | if (s0 >= 0) |
198 | dup2(s0, 0), close(s0); | |
199 | if (s1 >= 0) | |
200 | dup2(s1, 1), close(s1); | |
201 | if (s2 >= 0) | |
202 | dup2(s2, 2), close(s2); | |
203 | #endif | |
204 | ||
205 | if (cmd->pid < 0) { | |
206 | if (need_in) | |
207 | close_pair(fdin); | |
208 | else if (cmd->in) | |
209 | close(cmd->in); | |
210 | if (need_out) | |
211 | close_pair(fdout); | |
212 | else if (cmd->out) | |
213 | close(cmd->out); | |
214 | if (need_err) | |
215 | close_pair(fderr); | |
0ac77ec3 JS |
216 | errno = failed_errno; |
217 | return -1; | |
ba26f296 | 218 | } |
4919bf03 SP |
219 | |
220 | if (need_in) | |
221 | close(fdin[0]); | |
222 | else if (cmd->in) | |
223 | close(cmd->in); | |
224 | ||
f4bba25b SP |
225 | if (need_out) |
226 | close(fdout[1]); | |
c20181e3 | 227 | else if (cmd->out) |
f4bba25b SP |
228 | close(cmd->out); |
229 | ||
f3b33f1d JS |
230 | if (need_err) |
231 | close(fderr[1]); | |
232 | ||
ebcb5d16 SP |
233 | return 0; |
234 | } | |
235 | ||
0ac77ec3 | 236 | static int wait_or_whine(pid_t pid, const char *argv0) |
ebcb5d16 | 237 | { |
0ac77ec3 JS |
238 | int status, code = -1; |
239 | pid_t waiting; | |
240 | int failed_errno = 0; | |
241 | ||
242 | while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) | |
243 | ; /* nothing */ | |
244 | ||
245 | if (waiting < 0) { | |
246 | failed_errno = errno; | |
247 | error("waitpid for %s failed: %s", argv0, strerror(errno)); | |
248 | } else if (waiting != pid) { | |
249 | error("waitpid is confused (%s)", argv0); | |
250 | } else if (WIFSIGNALED(status)) { | |
b99d5f40 JS |
251 | code = WTERMSIG(status); |
252 | error("%s died of signal %d", argv0, code); | |
253 | /* | |
254 | * This return value is chosen so that code & 0xff | |
255 | * mimics the exit code that a POSIX shell would report for | |
256 | * a program that died from this signal. | |
257 | */ | |
258 | code -= 128; | |
0ac77ec3 | 259 | } else if (WIFEXITED(status)) { |
b1bf95bb | 260 | code = WEXITSTATUS(status); |
0ac77ec3 JS |
261 | /* |
262 | * Convert special exit code when execvp failed. | |
263 | */ | |
264 | if (code == 127) { | |
265 | code = -1; | |
266 | failed_errno = ENOENT; | |
267 | } | |
268 | } else { | |
269 | error("waitpid is confused (%s)", argv0); | |
b1bf95bb | 270 | } |
0ac77ec3 JS |
271 | errno = failed_errno; |
272 | return code; | |
b1bf95bb | 273 | } |
f1000898 | 274 | |
2d22c208 JS |
275 | int finish_command(struct child_process *cmd) |
276 | { | |
0ac77ec3 | 277 | return wait_or_whine(cmd->pid, cmd->argv[0]); |
2d22c208 JS |
278 | } |
279 | ||
ebcb5d16 SP |
280 | int run_command(struct child_process *cmd) |
281 | { | |
282 | int code = start_command(cmd); | |
283 | if (code) | |
284 | return code; | |
285 | return finish_command(cmd); | |
286 | } | |
287 | ||
1568fea0 | 288 | static void prepare_run_command_v_opt(struct child_process *cmd, |
ee493148 AR |
289 | const char **argv, |
290 | int opt) | |
1568fea0 AR |
291 | { |
292 | memset(cmd, 0, sizeof(*cmd)); | |
293 | cmd->argv = argv; | |
294 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
295 | cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
296 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
297 | } | |
298 | ||
f1000898 SP |
299 | int run_command_v_opt(const char **argv, int opt) |
300 | { | |
301 | struct child_process cmd; | |
1568fea0 AR |
302 | prepare_run_command_v_opt(&cmd, argv, opt); |
303 | return run_command(&cmd); | |
304 | } | |
305 | ||
ee493148 AR |
306 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) |
307 | { | |
308 | struct child_process cmd; | |
309 | prepare_run_command_v_opt(&cmd, argv, opt); | |
310 | cmd.dir = dir; | |
311 | cmd.env = env; | |
312 | return run_command(&cmd); | |
313 | } | |
2d22c208 | 314 | |
618ebe9f JS |
315 | #ifdef __MINGW32__ |
316 | static __stdcall unsigned run_thread(void *data) | |
317 | { | |
318 | struct async *async = data; | |
319 | return async->proc(async->fd_for_proc, async->data); | |
320 | } | |
321 | #endif | |
322 | ||
2d22c208 JS |
323 | int start_async(struct async *async) |
324 | { | |
325 | int pipe_out[2]; | |
326 | ||
327 | if (pipe(pipe_out) < 0) | |
328 | return error("cannot create pipe: %s", strerror(errno)); | |
618ebe9f | 329 | async->out = pipe_out[0]; |
2d22c208 | 330 | |
618ebe9f | 331 | #ifndef __MINGW32__ |
2c3766f0 AM |
332 | /* Flush stdio before fork() to avoid cloning buffers */ |
333 | fflush(NULL); | |
334 | ||
2d22c208 JS |
335 | async->pid = fork(); |
336 | if (async->pid < 0) { | |
337 | error("fork (async) failed: %s", strerror(errno)); | |
338 | close_pair(pipe_out); | |
339 | return -1; | |
340 | } | |
341 | if (!async->pid) { | |
342 | close(pipe_out[0]); | |
343 | exit(!!async->proc(pipe_out[1], async->data)); | |
344 | } | |
2d22c208 | 345 | close(pipe_out[1]); |
618ebe9f JS |
346 | #else |
347 | async->fd_for_proc = pipe_out[1]; | |
348 | async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL); | |
349 | if (!async->tid) { | |
350 | error("cannot create thread: %s", strerror(errno)); | |
351 | close_pair(pipe_out); | |
352 | return -1; | |
353 | } | |
354 | #endif | |
2d22c208 JS |
355 | return 0; |
356 | } | |
357 | ||
358 | int finish_async(struct async *async) | |
359 | { | |
618ebe9f | 360 | #ifndef __MINGW32__ |
0ac77ec3 | 361 | int ret = wait_or_whine(async->pid, "child process"); |
618ebe9f JS |
362 | #else |
363 | DWORD ret = 0; | |
364 | if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0) | |
365 | ret = error("waiting for thread failed: %lu", GetLastError()); | |
366 | else if (!GetExitCodeThread(async->tid, &ret)) | |
367 | ret = error("cannot get thread exit code: %lu", GetLastError()); | |
368 | CloseHandle(async->tid); | |
369 | #endif | |
2d22c208 JS |
370 | return ret; |
371 | } | |
ae98a008 SB |
372 | |
373 | int run_hook(const char *index_file, const char *name, ...) | |
374 | { | |
375 | struct child_process hook; | |
14e6298f | 376 | const char **argv = NULL, *env[2]; |
ae98a008 SB |
377 | char index[PATH_MAX]; |
378 | va_list args; | |
379 | int ret; | |
14e6298f | 380 | size_t i = 0, alloc = 0; |
ae98a008 | 381 | |
cf94ca8e SB |
382 | if (access(git_path("hooks/%s", name), X_OK) < 0) |
383 | return 0; | |
384 | ||
ae98a008 | 385 | va_start(args, name); |
14e6298f SB |
386 | ALLOC_GROW(argv, i + 1, alloc); |
387 | argv[i++] = git_path("hooks/%s", name); | |
388 | while (argv[i-1]) { | |
389 | ALLOC_GROW(argv, i + 1, alloc); | |
390 | argv[i++] = va_arg(args, const char *); | |
391 | } | |
ae98a008 SB |
392 | va_end(args); |
393 | ||
ae98a008 SB |
394 | memset(&hook, 0, sizeof(hook)); |
395 | hook.argv = argv; | |
396 | hook.no_stdin = 1; | |
397 | hook.stdout_to_stderr = 1; | |
398 | if (index_file) { | |
399 | snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file); | |
400 | env[0] = index; | |
401 | env[1] = NULL; | |
402 | hook.env = env; | |
403 | } | |
404 | ||
0ac77ec3 | 405 | ret = run_command(&hook); |
14e6298f | 406 | free(argv); |
ae98a008 SB |
407 | return ret; |
408 | } |