t7600-merge: Use test_expect_failure to test option parsing
[git/repo.git] / run-command.c
blob7068ec7e6d74af0cec233259b4b6e41a61ed5123
1 #include "cache.h"
2 #include "run-command.h"
3 #include "exec_cmd.h"
5 static inline void close_pair(int fd[2])
7 close(fd[0]);
8 close(fd[1]);
11 static inline void dup_devnull(int to)
13 int fd = open("/dev/null", O_RDWR);
14 dup2(fd, to);
15 close(fd);
18 int start_command(struct child_process *cmd)
20 int need_in, need_out, need_err;
21 int fdin[2], fdout[2], fderr[2];
24 * In case of errors we must keep the promise to close FDs
25 * that have been passed in via ->in and ->out.
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;
35 cmd->in = fdin[1];
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;
49 cmd->out = fdout[0];
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;
65 cmd->err = fderr[0];
68 trace_argv_printf(cmd->argv, "trace: run_command:");
70 cmd->pid = fork();
71 if (cmd->pid < 0) {
72 if (need_in)
73 close_pair(fdin);
74 else if (cmd->in)
75 close(cmd->in);
76 if (need_out)
77 close_pair(fdout);
78 else if (cmd->out)
79 close(cmd->out);
80 if (need_err)
81 close_pair(fderr);
82 return -ERR_RUN_COMMAND_FORK;
85 if (!cmd->pid) {
86 if (cmd->no_stdin)
87 dup_devnull(0);
88 else if (need_in) {
89 dup2(fdin[0], 0);
90 close_pair(fdin);
91 } else if (cmd->in) {
92 dup2(cmd->in, 0);
93 close(cmd->in);
96 if (cmd->no_stderr)
97 dup_devnull(2);
98 else if (need_err) {
99 dup2(fderr[1], 2);
100 close_pair(fderr);
103 if (cmd->no_stdout)
104 dup_devnull(1);
105 else if (cmd->stdout_to_stderr)
106 dup2(2, 1);
107 else if (need_out) {
108 dup2(fdout[1], 1);
109 close_pair(fdout);
110 } else if (cmd->out > 1) {
111 dup2(cmd->out, 1);
112 close(cmd->out);
115 if (cmd->dir && chdir(cmd->dir))
116 die("exec %s: cd to %s failed (%s)", cmd->argv[0],
117 cmd->dir, strerror(errno));
118 if (cmd->env) {
119 for (; *cmd->env; cmd->env++) {
120 if (strchr(*cmd->env, '='))
121 putenv((char*)*cmd->env);
122 else
123 unsetenv(*cmd->env);
126 if (cmd->git_cmd) {
127 execv_git_cmd(cmd->argv);
128 } else {
129 execvp(cmd->argv[0], (char *const*) cmd->argv);
131 die("exec %s failed.", cmd->argv[0]);
134 if (need_in)
135 close(fdin[0]);
136 else if (cmd->in)
137 close(cmd->in);
139 if (need_out)
140 close(fdout[1]);
141 else if (cmd->out)
142 close(cmd->out);
144 if (need_err)
145 close(fderr[1]);
147 return 0;
150 static int wait_or_whine(pid_t pid)
152 for (;;) {
153 int status, code;
154 pid_t waiting = waitpid(pid, &status, 0);
156 if (waiting < 0) {
157 if (errno == EINTR)
158 continue;
159 error("waitpid failed (%s)", strerror(errno));
160 return -ERR_RUN_COMMAND_WAITPID;
162 if (waiting != pid)
163 return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
164 if (WIFSIGNALED(status))
165 return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
167 if (!WIFEXITED(status))
168 return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
169 code = WEXITSTATUS(status);
170 if (code)
171 return -code;
172 return 0;
176 int finish_command(struct child_process *cmd)
178 return wait_or_whine(cmd->pid);
181 int run_command(struct child_process *cmd)
183 int code = start_command(cmd);
184 if (code)
185 return code;
186 return finish_command(cmd);
189 static void prepare_run_command_v_opt(struct child_process *cmd,
190 const char **argv,
191 int opt)
193 memset(cmd, 0, sizeof(*cmd));
194 cmd->argv = argv;
195 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
196 cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
197 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
200 int run_command_v_opt(const char **argv, int opt)
202 struct child_process cmd;
203 prepare_run_command_v_opt(&cmd, argv, opt);
204 return run_command(&cmd);
207 int run_command_v_opt_cd(const char **argv, int opt, const char *dir)
209 struct child_process cmd;
210 prepare_run_command_v_opt(&cmd, argv, opt);
211 cmd.dir = dir;
212 return run_command(&cmd);
215 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
217 struct child_process cmd;
218 prepare_run_command_v_opt(&cmd, argv, opt);
219 cmd.dir = dir;
220 cmd.env = env;
221 return run_command(&cmd);
224 int start_async(struct async *async)
226 int pipe_out[2];
228 if (pipe(pipe_out) < 0)
229 return error("cannot create pipe: %s", strerror(errno));
231 async->pid = fork();
232 if (async->pid < 0) {
233 error("fork (async) failed: %s", strerror(errno));
234 close_pair(pipe_out);
235 return -1;
237 if (!async->pid) {
238 close(pipe_out[0]);
239 exit(!!async->proc(pipe_out[1], async->data));
241 async->out = pipe_out[0];
242 close(pipe_out[1]);
243 return 0;
246 int finish_async(struct async *async)
248 int ret = 0;
250 if (wait_or_whine(async->pid))
251 ret = error("waitpid (async) failed");
252 return ret;