git-svn: Abort with an error if 'fetch' parameter is invalid.
[git/git.git] / run-command.c
CommitLineData
b1bf95bb
JW
1#include "cache.h"
2#include "run-command.h"
77cb17e9 3#include "exec_cmd.h"
b1bf95bb 4
9dc09c76
SP
5static inline void close_pair(int fd[2])
6{
7 close(fd[0]);
8 close(fd[1]);
9}
10
e4507ae8
SP
11static 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 18int 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
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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
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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
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53 if (need_err) {
54 if (pipe(fderr) < 0) {
55 if (need_in)
56 close_pair(fdin);
c20181e3
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57 else if (cmd->in)
58 close(cmd->in);
f3b33f1d
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59 if (need_out)
60 close_pair(fdout);
c20181e3
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61 else if (cmd->out)
62 close(cmd->out);
f3b33f1d
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63 return -ERR_RUN_COMMAND_PIPE;
64 }
65 cmd->err = fderr[0];
66 }
67
8852f5d7
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68 trace_argv_printf(cmd->argv, "trace: run_command:");
69
ba26f296 70#ifndef __MINGW32__
ebcb5d16 71 cmd->pid = fork();
ebcb5d16 72 if (!cmd->pid) {
e4507ae8
SP
73 if (cmd->no_stdin)
74 dup_devnull(0);
75 else if (need_in) {
4919bf03 76 dup2(fdin[0], 0);
9dc09c76 77 close_pair(fdin);
4919bf03
SP
78 } else if (cmd->in) {
79 dup2(cmd->in, 0);
80 close(cmd->in);
95d3c4f5 81 }
4919bf03 82
ce2cf27a
CC
83 if (cmd->no_stderr)
84 dup_devnull(2);
85 else if (need_err) {
86 dup2(fderr[1], 2);
87 close_pair(fderr);
88 }
89
e4507ae8
SP
90 if (cmd->no_stdout)
91 dup_devnull(1);
92 else if (cmd->stdout_to_stderr)
cd83c74c 93 dup2(2, 1);
f4bba25b
SP
94 else if (need_out) {
95 dup2(fdout[1], 1);
96 close_pair(fdout);
97 } else if (cmd->out > 1) {
98 dup2(cmd->out, 1);
99 close(cmd->out);
100 }
101
1568fea0
AR
102 if (cmd->dir && chdir(cmd->dir))
103 die("exec %s: cd to %s failed (%s)", cmd->argv[0],
104 cmd->dir, strerror(errno));
ee493148 105 if (cmd->env) {
3427b375
AR
106 for (; *cmd->env; cmd->env++) {
107 if (strchr(*cmd->env, '='))
108 putenv((char*)*cmd->env);
109 else
110 unsetenv(*cmd->env);
111 }
ee493148 112 }
f1000898
SP
113 if (cmd->git_cmd) {
114 execv_git_cmd(cmd->argv);
77cb17e9 115 } else {
f1000898 116 execvp(cmd->argv[0], (char *const*) cmd->argv);
128aed68 117 }
f1000898 118 die("exec %s failed.", cmd->argv[0]);
b1bf95bb 119 }
ba26f296
JS
120#else
121 int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */
108ac313 122 const char **sargv = cmd->argv;
ba26f296 123 char **env = environ;
ba26f296
JS
124
125 if (cmd->no_stdin) {
126 s0 = dup(0);
127 dup_devnull(0);
128 } else if (need_in) {
129 s0 = dup(0);
130 dup2(fdin[0], 0);
131 } else if (cmd->in) {
132 s0 = dup(0);
133 dup2(cmd->in, 0);
134 }
135
136 if (cmd->no_stderr) {
137 s2 = dup(2);
138 dup_devnull(2);
139 } else if (need_err) {
140 s2 = dup(2);
141 dup2(fderr[1], 2);
142 }
143
144 if (cmd->no_stdout) {
145 s1 = dup(1);
146 dup_devnull(1);
147 } else if (cmd->stdout_to_stderr) {
148 s1 = dup(1);
149 dup2(2, 1);
150 } else if (need_out) {
151 s1 = dup(1);
152 dup2(fdout[1], 1);
153 } else if (cmd->out > 1) {
154 s1 = dup(1);
155 dup2(cmd->out, 1);
156 }
157
158 if (cmd->dir)
159 die("chdir in start_command() not implemented");
160 if (cmd->env) {
161 env = copy_environ();
162 for (; *cmd->env; cmd->env++)
163 env = env_setenv(env, *cmd->env);
164 }
165
166 if (cmd->git_cmd) {
108ac313 167 cmd->argv = prepare_git_cmd(cmd->argv);
ba26f296
JS
168 }
169
7e5d7768 170 cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
ba26f296
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171
172 if (cmd->env)
173 free_environ(env);
174 if (cmd->git_cmd)
108ac313 175 free(cmd->argv);
ba26f296 176
108ac313 177 cmd->argv = sargv;
ba26f296
JS
178 if (s0 >= 0)
179 dup2(s0, 0), close(s0);
180 if (s1 >= 0)
181 dup2(s1, 1), close(s1);
182 if (s2 >= 0)
183 dup2(s2, 2), close(s2);
184#endif
185
186 if (cmd->pid < 0) {
187 if (need_in)
188 close_pair(fdin);
189 else if (cmd->in)
190 close(cmd->in);
191 if (need_out)
192 close_pair(fdout);
193 else if (cmd->out)
194 close(cmd->out);
195 if (need_err)
196 close_pair(fderr);
197 return -ERR_RUN_COMMAND_FORK;
198 }
4919bf03
SP
199
200 if (need_in)
201 close(fdin[0]);
202 else if (cmd->in)
203 close(cmd->in);
204
f4bba25b
SP
205 if (need_out)
206 close(fdout[1]);
c20181e3 207 else if (cmd->out)
f4bba25b
SP
208 close(cmd->out);
209
f3b33f1d
JS
210 if (need_err)
211 close(fderr[1]);
212
ebcb5d16
SP
213 return 0;
214}
215
2d22c208 216static int wait_or_whine(pid_t pid)
ebcb5d16 217{
b1bf95bb
JW
218 for (;;) {
219 int status, code;
2d22c208 220 pid_t waiting = waitpid(pid, &status, 0);
b1bf95bb 221
6f002f98 222 if (waiting < 0) {
b1bf95bb
JW
223 if (errno == EINTR)
224 continue;
6f002f98 225 error("waitpid failed (%s)", strerror(errno));
b1bf95bb
JW
226 return -ERR_RUN_COMMAND_WAITPID;
227 }
2d22c208 228 if (waiting != pid)
b1bf95bb
JW
229 return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
230 if (WIFSIGNALED(status))
231 return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
232
233 if (!WIFEXITED(status))
234 return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
235 code = WEXITSTATUS(status);
236 if (code)
237 return -code;
238 return 0;
239 }
240}
f1000898 241
2d22c208
JS
242int finish_command(struct child_process *cmd)
243{
2d22c208
JS
244 return wait_or_whine(cmd->pid);
245}
246
ebcb5d16
SP
247int run_command(struct child_process *cmd)
248{
249 int code = start_command(cmd);
250 if (code)
251 return code;
252 return finish_command(cmd);
253}
254
1568fea0 255static void prepare_run_command_v_opt(struct child_process *cmd,
ee493148
AR
256 const char **argv,
257 int opt)
1568fea0
AR
258{
259 memset(cmd, 0, sizeof(*cmd));
260 cmd->argv = argv;
261 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
262 cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
263 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
264}
265
f1000898
SP
266int run_command_v_opt(const char **argv, int opt)
267{
268 struct child_process cmd;
1568fea0
AR
269 prepare_run_command_v_opt(&cmd, argv, opt);
270 return run_command(&cmd);
271}
272
273int run_command_v_opt_cd(const char **argv, int opt, const char *dir)
274{
275 struct child_process cmd;
276 prepare_run_command_v_opt(&cmd, argv, opt);
277 cmd.dir = dir;
f1000898
SP
278 return run_command(&cmd);
279}
ee493148
AR
280
281int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
282{
283 struct child_process cmd;
284 prepare_run_command_v_opt(&cmd, argv, opt);
285 cmd.dir = dir;
286 cmd.env = env;
287 return run_command(&cmd);
288}
2d22c208 289
618ebe9f
JS
290#ifdef __MINGW32__
291static __stdcall unsigned run_thread(void *data)
292{
293 struct async *async = data;
294 return async->proc(async->fd_for_proc, async->data);
295}
296#endif
297
2d22c208
JS
298int start_async(struct async *async)
299{
300 int pipe_out[2];
301
302 if (pipe(pipe_out) < 0)
303 return error("cannot create pipe: %s", strerror(errno));
618ebe9f 304 async->out = pipe_out[0];
2d22c208 305
618ebe9f 306#ifndef __MINGW32__
2c3766f0
AM
307 /* Flush stdio before fork() to avoid cloning buffers */
308 fflush(NULL);
309
2d22c208
JS
310 async->pid = fork();
311 if (async->pid < 0) {
312 error("fork (async) failed: %s", strerror(errno));
313 close_pair(pipe_out);
314 return -1;
315 }
316 if (!async->pid) {
317 close(pipe_out[0]);
318 exit(!!async->proc(pipe_out[1], async->data));
319 }
2d22c208 320 close(pipe_out[1]);
618ebe9f
JS
321#else
322 async->fd_for_proc = pipe_out[1];
323 async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
324 if (!async->tid) {
325 error("cannot create thread: %s", strerror(errno));
326 close_pair(pipe_out);
327 return -1;
328 }
329#endif
2d22c208
JS
330 return 0;
331}
332
333int finish_async(struct async *async)
334{
618ebe9f 335#ifndef __MINGW32__
2d22c208
JS
336 int ret = 0;
337
338 if (wait_or_whine(async->pid))
339 ret = error("waitpid (async) failed");
618ebe9f
JS
340#else
341 DWORD ret = 0;
342 if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
343 ret = error("waiting for thread failed: %lu", GetLastError());
344 else if (!GetExitCodeThread(async->tid, &ret))
345 ret = error("cannot get thread exit code: %lu", GetLastError());
346 CloseHandle(async->tid);
347#endif
2d22c208
JS
348 return ret;
349}