]>
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]; | |
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 | ||
ba26f296 | 68 | #ifndef __MINGW32__ |
ebcb5d16 | 69 | cmd->pid = fork(); |
ebcb5d16 | 70 | if (!cmd->pid) { |
e4507ae8 SP |
71 | if (cmd->no_stdin) |
72 | dup_devnull(0); | |
73 | else if (need_in) { | |
4919bf03 | 74 | dup2(fdin[0], 0); |
9dc09c76 | 75 | close_pair(fdin); |
4919bf03 SP |
76 | } else if (cmd->in) { |
77 | dup2(cmd->in, 0); | |
78 | close(cmd->in); | |
95d3c4f5 | 79 | } |
4919bf03 | 80 | |
ce2cf27a CC |
81 | if (cmd->no_stderr) |
82 | dup_devnull(2); | |
83 | else if (need_err) { | |
84 | dup2(fderr[1], 2); | |
85 | close_pair(fderr); | |
86 | } | |
87 | ||
e4507ae8 SP |
88 | if (cmd->no_stdout) |
89 | dup_devnull(1); | |
90 | else if (cmd->stdout_to_stderr) | |
cd83c74c | 91 | dup2(2, 1); |
f4bba25b SP |
92 | else if (need_out) { |
93 | dup2(fdout[1], 1); | |
94 | close_pair(fdout); | |
95 | } else if (cmd->out > 1) { | |
96 | dup2(cmd->out, 1); | |
97 | close(cmd->out); | |
98 | } | |
99 | ||
1568fea0 AR |
100 | if (cmd->dir && chdir(cmd->dir)) |
101 | die("exec %s: cd to %s failed (%s)", cmd->argv[0], | |
102 | cmd->dir, strerror(errno)); | |
ee493148 | 103 | if (cmd->env) { |
3427b375 AR |
104 | for (; *cmd->env; cmd->env++) { |
105 | if (strchr(*cmd->env, '=')) | |
106 | putenv((char*)*cmd->env); | |
107 | else | |
108 | unsetenv(*cmd->env); | |
109 | } | |
ee493148 | 110 | } |
f1000898 SP |
111 | if (cmd->git_cmd) { |
112 | execv_git_cmd(cmd->argv); | |
77cb17e9 | 113 | } else { |
f1000898 | 114 | execvp(cmd->argv[0], (char *const*) cmd->argv); |
128aed68 | 115 | } |
f1000898 | 116 | die("exec %s failed.", cmd->argv[0]); |
b1bf95bb | 117 | } |
ba26f296 JS |
118 | #else |
119 | int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */ | |
120 | const char *sargv0 = cmd->argv[0]; | |
121 | char **env = environ; | |
122 | struct strbuf git_cmd; | |
123 | ||
124 | if (cmd->no_stdin) { | |
125 | s0 = dup(0); | |
126 | dup_devnull(0); | |
127 | } else if (need_in) { | |
128 | s0 = dup(0); | |
129 | dup2(fdin[0], 0); | |
130 | } else if (cmd->in) { | |
131 | s0 = dup(0); | |
132 | dup2(cmd->in, 0); | |
133 | } | |
134 | ||
135 | if (cmd->no_stderr) { | |
136 | s2 = dup(2); | |
137 | dup_devnull(2); | |
138 | } else if (need_err) { | |
139 | s2 = dup(2); | |
140 | dup2(fderr[1], 2); | |
141 | } | |
142 | ||
143 | if (cmd->no_stdout) { | |
144 | s1 = dup(1); | |
145 | dup_devnull(1); | |
146 | } else if (cmd->stdout_to_stderr) { | |
147 | s1 = dup(1); | |
148 | dup2(2, 1); | |
149 | } else if (need_out) { | |
150 | s1 = dup(1); | |
151 | dup2(fdout[1], 1); | |
152 | } else if (cmd->out > 1) { | |
153 | s1 = dup(1); | |
154 | dup2(cmd->out, 1); | |
155 | } | |
156 | ||
157 | if (cmd->dir) | |
158 | die("chdir in start_command() not implemented"); | |
159 | if (cmd->env) { | |
160 | env = copy_environ(); | |
161 | for (; *cmd->env; cmd->env++) | |
162 | env = env_setenv(env, *cmd->env); | |
163 | } | |
164 | ||
165 | if (cmd->git_cmd) { | |
166 | strbuf_init(&git_cmd, 0); | |
167 | strbuf_addf(&git_cmd, "git-%s", cmd->argv[0]); | |
168 | cmd->argv[0] = git_cmd.buf; | |
169 | } | |
170 | ||
7e5d7768 | 171 | cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env); |
ba26f296 JS |
172 | |
173 | if (cmd->env) | |
174 | free_environ(env); | |
175 | if (cmd->git_cmd) | |
176 | strbuf_release(&git_cmd); | |
177 | ||
178 | cmd->argv[0] = sargv0; | |
179 | if (s0 >= 0) | |
180 | dup2(s0, 0), close(s0); | |
181 | if (s1 >= 0) | |
182 | dup2(s1, 1), close(s1); | |
183 | if (s2 >= 0) | |
184 | dup2(s2, 2), close(s2); | |
185 | #endif | |
186 | ||
187 | if (cmd->pid < 0) { | |
188 | if (need_in) | |
189 | close_pair(fdin); | |
190 | else if (cmd->in) | |
191 | close(cmd->in); | |
192 | if (need_out) | |
193 | close_pair(fdout); | |
194 | else if (cmd->out) | |
195 | close(cmd->out); | |
196 | if (need_err) | |
197 | close_pair(fderr); | |
198 | return -ERR_RUN_COMMAND_FORK; | |
199 | } | |
4919bf03 SP |
200 | |
201 | if (need_in) | |
202 | close(fdin[0]); | |
203 | else if (cmd->in) | |
204 | close(cmd->in); | |
205 | ||
f4bba25b SP |
206 | if (need_out) |
207 | close(fdout[1]); | |
c20181e3 | 208 | else if (cmd->out) |
f4bba25b SP |
209 | close(cmd->out); |
210 | ||
f3b33f1d JS |
211 | if (need_err) |
212 | close(fderr[1]); | |
213 | ||
ebcb5d16 SP |
214 | return 0; |
215 | } | |
216 | ||
2d22c208 | 217 | static int wait_or_whine(pid_t pid) |
ebcb5d16 | 218 | { |
b1bf95bb JW |
219 | for (;;) { |
220 | int status, code; | |
2d22c208 | 221 | pid_t waiting = waitpid(pid, &status, 0); |
b1bf95bb | 222 | |
6f002f98 | 223 | if (waiting < 0) { |
b1bf95bb JW |
224 | if (errno == EINTR) |
225 | continue; | |
6f002f98 | 226 | error("waitpid failed (%s)", strerror(errno)); |
b1bf95bb JW |
227 | return -ERR_RUN_COMMAND_WAITPID; |
228 | } | |
2d22c208 | 229 | if (waiting != pid) |
b1bf95bb JW |
230 | return -ERR_RUN_COMMAND_WAITPID_WRONG_PID; |
231 | if (WIFSIGNALED(status)) | |
232 | return -ERR_RUN_COMMAND_WAITPID_SIGNAL; | |
233 | ||
234 | if (!WIFEXITED(status)) | |
235 | return -ERR_RUN_COMMAND_WAITPID_NOEXIT; | |
236 | code = WEXITSTATUS(status); | |
237 | if (code) | |
238 | return -code; | |
239 | return 0; | |
240 | } | |
241 | } | |
f1000898 | 242 | |
2d22c208 JS |
243 | int finish_command(struct child_process *cmd) |
244 | { | |
2d22c208 JS |
245 | return wait_or_whine(cmd->pid); |
246 | } | |
247 | ||
ebcb5d16 SP |
248 | int run_command(struct child_process *cmd) |
249 | { | |
250 | int code = start_command(cmd); | |
251 | if (code) | |
252 | return code; | |
253 | return finish_command(cmd); | |
254 | } | |
255 | ||
1568fea0 | 256 | static void prepare_run_command_v_opt(struct child_process *cmd, |
ee493148 AR |
257 | const char **argv, |
258 | int opt) | |
1568fea0 AR |
259 | { |
260 | memset(cmd, 0, sizeof(*cmd)); | |
261 | cmd->argv = argv; | |
262 | cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; | |
263 | cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0; | |
264 | cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; | |
265 | } | |
266 | ||
f1000898 SP |
267 | int run_command_v_opt(const char **argv, int opt) |
268 | { | |
269 | struct child_process cmd; | |
1568fea0 AR |
270 | prepare_run_command_v_opt(&cmd, argv, opt); |
271 | return run_command(&cmd); | |
272 | } | |
273 | ||
274 | int run_command_v_opt_cd(const char **argv, int opt, const char *dir) | |
275 | { | |
276 | struct child_process cmd; | |
277 | prepare_run_command_v_opt(&cmd, argv, opt); | |
278 | cmd.dir = dir; | |
f1000898 SP |
279 | return run_command(&cmd); |
280 | } | |
ee493148 AR |
281 | |
282 | int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) | |
283 | { | |
284 | struct child_process cmd; | |
285 | prepare_run_command_v_opt(&cmd, argv, opt); | |
286 | cmd.dir = dir; | |
287 | cmd.env = env; | |
288 | return run_command(&cmd); | |
289 | } | |
2d22c208 | 290 | |
618ebe9f JS |
291 | #ifdef __MINGW32__ |
292 | static __stdcall unsigned run_thread(void *data) | |
293 | { | |
294 | struct async *async = data; | |
295 | return async->proc(async->fd_for_proc, async->data); | |
296 | } | |
297 | #endif | |
298 | ||
2d22c208 JS |
299 | int start_async(struct async *async) |
300 | { | |
301 | int pipe_out[2]; | |
302 | ||
303 | if (pipe(pipe_out) < 0) | |
304 | return error("cannot create pipe: %s", strerror(errno)); | |
618ebe9f | 305 | async->out = pipe_out[0]; |
2d22c208 | 306 | |
618ebe9f | 307 | #ifndef __MINGW32__ |
2d22c208 JS |
308 | async->pid = fork(); |
309 | if (async->pid < 0) { | |
310 | error("fork (async) failed: %s", strerror(errno)); | |
311 | close_pair(pipe_out); | |
312 | return -1; | |
313 | } | |
314 | if (!async->pid) { | |
315 | close(pipe_out[0]); | |
316 | exit(!!async->proc(pipe_out[1], async->data)); | |
317 | } | |
2d22c208 | 318 | close(pipe_out[1]); |
618ebe9f JS |
319 | #else |
320 | async->fd_for_proc = pipe_out[1]; | |
321 | async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL); | |
322 | if (!async->tid) { | |
323 | error("cannot create thread: %s", strerror(errno)); | |
324 | close_pair(pipe_out); | |
325 | return -1; | |
326 | } | |
327 | #endif | |
2d22c208 JS |
328 | return 0; |
329 | } | |
330 | ||
331 | int finish_async(struct async *async) | |
332 | { | |
618ebe9f | 333 | #ifndef __MINGW32__ |
2d22c208 JS |
334 | int ret = 0; |
335 | ||
336 | if (wait_or_whine(async->pid)) | |
337 | ret = error("waitpid (async) failed"); | |
618ebe9f JS |
338 | #else |
339 | DWORD ret = 0; | |
340 | if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0) | |
341 | ret = error("waiting for thread failed: %lu", GetLastError()); | |
342 | else if (!GetExitCodeThread(async->tid, &ret)) | |
343 | ret = error("cannot get thread exit code: %lu", GetLastError()); | |
344 | CloseHandle(async->tid); | |
345 | #endif | |
2d22c208 JS |
346 | return ret; |
347 | } |