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Commit | Line | Data |
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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]; | |
4919bf03 | 22 | |
c20181e3 JS |
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 | ||
e4507ae8 | 28 | need_in = !cmd->no_stdin && cmd->in < 0; |
4919bf03 | 29 | if (need_in) { |
c20181e3 JS |
30 | if (pipe(fdin) < 0) { |
31 | if (cmd->out > 0) | |
32 | close(cmd->out); | |
4919bf03 | 33 | return -ERR_RUN_COMMAND_PIPE; |
c20181e3 | 34 | } |
4919bf03 | 35 | cmd->in = fdin[1]; |
4919bf03 SP |
36 | } |
37 | ||
e4507ae8 SP |
38 | need_out = !cmd->no_stdout |
39 | && !cmd->stdout_to_stderr | |
40 | && cmd->out < 0; | |
f4bba25b SP |
41 | if (need_out) { |
42 | if (pipe(fdout) < 0) { | |
43 | if (need_in) | |
44 | close_pair(fdin); | |
c20181e3 JS |
45 | else if (cmd->in) |
46 | close(cmd->in); | |
f4bba25b SP |
47 | return -ERR_RUN_COMMAND_PIPE; |
48 | } | |
49 | cmd->out = fdout[0]; | |
f4bba25b SP |
50 | } |
51 | ||
b73a4397 | 52 | need_err = !cmd->no_stderr && cmd->err < 0; |
f3b33f1d JS |
53 | if (need_err) { |
54 | if (pipe(fderr) < 0) { | |
55 | if (need_in) | |
56 | close_pair(fdin); | |
c20181e3 JS |
57 | else if (cmd->in) |
58 | close(cmd->in); | |
f3b33f1d JS |
59 | if (need_out) |
60 | close_pair(fdout); | |
c20181e3 JS |
61 | else if (cmd->out) |
62 | close(cmd->out); | |
f3b33f1d JS |
63 | return -ERR_RUN_COMMAND_PIPE; |
64 | } | |
65 | cmd->err = fderr[0]; | |
66 | } | |
67 | ||
8852f5d7 JS |
68 | trace_argv_printf(cmd->argv, "trace: run_command:"); |
69 | ||
ba26f296 | 70 | #ifndef __MINGW32__ |
7d0b18a4 | 71 | fflush(NULL); |
ebcb5d16 | 72 | cmd->pid = fork(); |
ebcb5d16 | 73 | if (!cmd->pid) { |
e4507ae8 SP |
74 | if (cmd->no_stdin) |
75 | dup_devnull(0); | |
76 | else if (need_in) { | |
4919bf03 | 77 | dup2(fdin[0], 0); |
9dc09c76 | 78 | close_pair(fdin); |
4919bf03 SP |
79 | } else if (cmd->in) { |
80 | dup2(cmd->in, 0); | |
81 | close(cmd->in); | |
95d3c4f5 | 82 | } |
4919bf03 | 83 | |
ce2cf27a CC |
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 | ||
e4507ae8 SP |
91 | if (cmd->no_stdout) |
92 | dup_devnull(1); | |
93 | else if (cmd->stdout_to_stderr) | |
cd83c74c | 94 | dup2(2, 1); |
f4bba25b SP |
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 | ||
1568fea0 AR |
103 | if (cmd->dir && chdir(cmd->dir)) |
104 | die("exec %s: cd to %s failed (%s)", cmd->argv[0], | |
105 | cmd->dir, strerror(errno)); | |
ee493148 | 106 | if (cmd->env) { |
3427b375 AR |
107 | for (; *cmd->env; cmd->env++) { |
108 | if (strchr(*cmd->env, '=')) | |
109 | putenv((char*)*cmd->env); | |
110 | else | |
111 | unsetenv(*cmd->env); | |
112 | } | |
ee493148 | 113 | } |
ccf08bc3 JK |
114 | if (cmd->preexec_cb) |
115 | cmd->preexec_cb(); | |
f1000898 SP |
116 | if (cmd->git_cmd) { |
117 | execv_git_cmd(cmd->argv); | |
77cb17e9 | 118 | } else { |
f1000898 | 119 | execvp(cmd->argv[0], (char *const*) cmd->argv); |
128aed68 | 120 | } |
45c0961c JK |
121 | trace_printf("trace: exec '%s' failed: %s\n", cmd->argv[0], |
122 | strerror(errno)); | |
123 | exit(127); | |
b1bf95bb | 124 | } |
ba26f296 JS |
125 | #else |
126 | int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */ | |
108ac313 | 127 | const char **sargv = cmd->argv; |
ba26f296 | 128 | char **env = environ; |
ba26f296 JS |
129 | |
130 | if (cmd->no_stdin) { | |
131 | s0 = dup(0); | |
132 | dup_devnull(0); | |
133 | } else if (need_in) { | |
134 | s0 = dup(0); | |
135 | dup2(fdin[0], 0); | |
136 | } else if (cmd->in) { | |
137 | s0 = dup(0); | |
138 | dup2(cmd->in, 0); | |
139 | } | |
140 | ||
141 | if (cmd->no_stderr) { | |
142 | s2 = dup(2); | |
143 | dup_devnull(2); | |
144 | } else if (need_err) { | |
145 | s2 = dup(2); | |
146 | dup2(fderr[1], 2); | |
147 | } | |
148 | ||
149 | if (cmd->no_stdout) { | |
150 | s1 = dup(1); | |
151 | dup_devnull(1); | |
152 | } else if (cmd->stdout_to_stderr) { | |
153 | s1 = dup(1); | |
154 | dup2(2, 1); | |
155 | } else if (need_out) { | |
156 | s1 = dup(1); | |
157 | dup2(fdout[1], 1); | |
158 | } else if (cmd->out > 1) { | |
159 | s1 = dup(1); | |
160 | dup2(cmd->out, 1); | |
161 | } | |
162 | ||
163 | if (cmd->dir) | |
164 | die("chdir in start_command() not implemented"); | |
165 | if (cmd->env) { | |
166 | env = copy_environ(); | |
167 | for (; *cmd->env; cmd->env++) | |
168 | env = env_setenv(env, *cmd->env); | |
169 | } | |
170 | ||
171 | if (cmd->git_cmd) { | |
108ac313 | 172 | cmd->argv = prepare_git_cmd(cmd->argv); |
ba26f296 JS |
173 | } |
174 | ||
7e5d7768 | 175 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env); |
ba26f296 JS |
176 | |
177 | if (cmd->env) | |
178 | free_environ(env); | |
179 | if (cmd->git_cmd) | |
108ac313 | 180 | free(cmd->argv); |
ba26f296 | 181 | |
108ac313 | 182 | cmd->argv = sargv; |
ba26f296 JS |
183 | if (s0 >= 0) |
184 | dup2(s0, 0), close(s0); | |
185 | if (s1 >= 0) | |
186 | dup2(s1, 1), close(s1); | |
187 | if (s2 >= 0) | |
188 | dup2(s2, 2), close(s2); | |
189 | #endif | |
190 | ||
191 | if (cmd->pid < 0) { | |
45c0961c | 192 | int err = errno; |
ba26f296 JS |
193 | if (need_in) |
194 | close_pair(fdin); | |
195 | else if (cmd->in) | |
196 | close(cmd->in); | |
197 | if (need_out) | |
198 | close_pair(fdout); | |
199 | else if (cmd->out) | |
200 | close(cmd->out); | |
201 | if (need_err) | |
202 | close_pair(fderr); | |
45c0961c JK |
203 | return err == ENOENT ? |
204 | -ERR_RUN_COMMAND_EXEC : | |
205 | -ERR_RUN_COMMAND_FORK; | |
ba26f296 | 206 | } |
4919bf03 SP |
207 | |
208 | if (need_in) | |
209 | close(fdin[0]); | |
210 | else if (cmd->in) | |
211 | close(cmd->in); | |
212 | ||
f4bba25b SP |
213 | if (need_out) |
214 | close(fdout[1]); | |
c20181e3 | 215 | else if (cmd->out) |
f4bba25b SP |
216 | close(cmd->out); |
217 | ||
f3b33f1d JS |
218 | if (need_err) |
219 | close(fderr[1]); | |
220 | ||
ebcb5d16 SP |
221 | return 0; |
222 | } | |
223 | ||
2d22c208 | 224 | static int wait_or_whine(pid_t pid) |
ebcb5d16 | 225 | { |
b1bf95bb JW |
226 | for (;;) { |
227 | int status, code; | |
2d22c208 | 228 | pid_t waiting = waitpid(pid, &status, 0); |
b1bf95bb | 229 | |
6f002f98 | 230 | if (waiting < 0) { |
b1bf95bb JW |
231 | if (errno == EINTR) |
232 | continue; | |
6f002f98 | 233 | error("waitpid failed (%s)", strerror(errno)); |
b1bf95bb JW |
234 | return -ERR_RUN_COMMAND_WAITPID; |
235 | } | |
2d22c208 | 236 | if (waiting != pid) |
b1bf95bb JW |
237 | return -ERR_RUN_COMMAND_WAITPID_WRONG_PID; |
238 | if (WIFSIGNALED(status)) | |
239 | return -ERR_RUN_COMMAND_WAITPID_SIGNAL; | |
240 | ||
241 | if (!WIFEXITED(status)) | |
242 | return -ERR_RUN_COMMAND_WAITPID_NOEXIT; | |
243 | code = WEXITSTATUS(status); | |
45c0961c JK |
244 | switch (code) { |
245 | case 127: | |
246 | return -ERR_RUN_COMMAND_EXEC; | |
247 | case 0: | |
248 | return 0; | |
249 | default: | |
b1bf95bb | 250 | return -code; |
45c0961c | 251 | } |
b1bf95bb JW |
252 | } |
253 | } | |
f1000898 | 254 | |
2d22c208 JS |
255 | int finish_command(struct child_process *cmd) |
256 | { | |
2d22c208 JS |
257 | return wait_or_whine(cmd->pid); |
258 | } | |
259 | ||
ebcb5d16 SP |
260 | int run_command(struct child_process *cmd) |
261 | { | |
262 | int code = start_command(cmd); | |
263 | if (code) | |
264 | return code; | |
265 | return finish_command(cmd); | |
266 | } | |
267 | ||
1568fea0 | 268 | static void prepare_run_command_v_opt(struct child_process *cmd, |
ee493148 AR |
269 | const char **argv, |
270 | int opt) | |
1568fea0 AR |
271 | { |
272 | memset(cmd, 0, sizeof(*cmd)); | |
273 | cmd->argv = argv; | |
274 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
275 | cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
276 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
277 | } | |
278 | ||
f1000898 SP |
279 | int run_command_v_opt(const char **argv, int opt) |
280 | { | |
281 | struct child_process cmd; | |
1568fea0 AR |
282 | prepare_run_command_v_opt(&cmd, argv, opt); |
283 | return run_command(&cmd); | |
284 | } | |
285 | ||
ee493148 AR |
286 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) |
287 | { | |
288 | struct child_process cmd; | |
289 | prepare_run_command_v_opt(&cmd, argv, opt); | |
290 | cmd.dir = dir; | |
291 | cmd.env = env; | |
292 | return run_command(&cmd); | |
293 | } | |
2d22c208 | 294 | |
618ebe9f JS |
295 | #ifdef __MINGW32__ |
296 | static __stdcall unsigned run_thread(void *data) | |
297 | { | |
298 | struct async *async = data; | |
299 | return async->proc(async->fd_for_proc, async->data); | |
300 | } | |
301 | #endif | |
302 | ||
2d22c208 JS |
303 | int start_async(struct async *async) |
304 | { | |
305 | int pipe_out[2]; | |
306 | ||
307 | if (pipe(pipe_out) < 0) | |
308 | return error("cannot create pipe: %s", strerror(errno)); | |
618ebe9f | 309 | async->out = pipe_out[0]; |
2d22c208 | 310 | |
618ebe9f | 311 | #ifndef __MINGW32__ |
2c3766f0 AM |
312 | /* Flush stdio before fork() to avoid cloning buffers */ |
313 | fflush(NULL); | |
314 | ||
2d22c208 JS |
315 | async->pid = fork(); |
316 | if (async->pid < 0) { | |
317 | error("fork (async) failed: %s", strerror(errno)); | |
318 | close_pair(pipe_out); | |
319 | return -1; | |
320 | } | |
321 | if (!async->pid) { | |
322 | close(pipe_out[0]); | |
323 | exit(!!async->proc(pipe_out[1], async->data)); | |
324 | } | |
2d22c208 | 325 | close(pipe_out[1]); |
618ebe9f JS |
326 | #else |
327 | async->fd_for_proc = pipe_out[1]; | |
328 | async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL); | |
329 | if (!async->tid) { | |
330 | error("cannot create thread: %s", strerror(errno)); | |
331 | close_pair(pipe_out); | |
332 | return -1; | |
333 | } | |
334 | #endif | |
2d22c208 JS |
335 | return 0; |
336 | } | |
337 | ||
338 | int finish_async(struct async *async) | |
339 | { | |
618ebe9f | 340 | #ifndef __MINGW32__ |
2d22c208 JS |
341 | int ret = 0; |
342 | ||
343 | if (wait_or_whine(async->pid)) | |
344 | ret = error("waitpid (async) failed"); | |
618ebe9f JS |
345 | #else |
346 | DWORD ret = 0; | |
347 | if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0) | |
348 | ret = error("waiting for thread failed: %lu", GetLastError()); | |
349 | else if (!GetExitCodeThread(async->tid, &ret)) | |
350 | ret = error("cannot get thread exit code: %lu", GetLastError()); | |
351 | CloseHandle(async->tid); | |
352 | #endif | |
2d22c208 JS |
353 | return ret; |
354 | } | |
ae98a008 SB |
355 | |
356 | int run_hook(const char *index_file, const char *name, ...) | |
357 | { | |
358 | struct child_process hook; | |
14e6298f | 359 | const char **argv = NULL, *env[2]; |
ae98a008 SB |
360 | char index[PATH_MAX]; |
361 | va_list args; | |
362 | int ret; | |
14e6298f | 363 | size_t i = 0, alloc = 0; |
ae98a008 | 364 | |
cf94ca8e SB |
365 | if (access(git_path("hooks/%s", name), X_OK) < 0) |
366 | return 0; | |
367 | ||
ae98a008 | 368 | va_start(args, name); |
14e6298f SB |
369 | ALLOC_GROW(argv, i + 1, alloc); |
370 | argv[i++] = git_path("hooks/%s", name); | |
371 | while (argv[i-1]) { | |
372 | ALLOC_GROW(argv, i + 1, alloc); | |
373 | argv[i++] = va_arg(args, const char *); | |
374 | } | |
ae98a008 SB |
375 | va_end(args); |
376 | ||
ae98a008 SB |
377 | memset(&hook, 0, sizeof(hook)); |
378 | hook.argv = argv; | |
379 | hook.no_stdin = 1; | |
380 | hook.stdout_to_stderr = 1; | |
381 | if (index_file) { | |
382 | snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file); | |
383 | env[0] = index; | |
384 | env[1] = NULL; | |
385 | hook.env = env; | |
386 | } | |
387 | ||
388 | ret = start_command(&hook); | |
14e6298f | 389 | free(argv); |
ae98a008 SB |
390 | if (ret) { |
391 | warning("Could not spawn %s", argv[0]); | |
392 | return ret; | |
393 | } | |
394 | ret = finish_command(&hook); | |
395 | if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL) | |
396 | warning("%s exited due to uncaught signal", argv[0]); | |
397 | ||
398 | return ret; | |
399 | } |