Rewrite synopsis to clarify the two primary uses of git-checkout.
[git.git] / run-command.c
1 #include "cache.h"
2 #include "run-command.h"
3 #include <sys/wait.h>
4 #include "exec_cmd.h"
5
6 int run_command_v_opt(int argc, const char **argv, int flags)
7 {
8         pid_t pid = fork();
9
10         if (pid < 0)
11                 return -ERR_RUN_COMMAND_FORK;
12         if (!pid) {
13                 if (flags & RUN_COMMAND_NO_STDIO) {
14                         int fd = open("/dev/null", O_RDWR);
15                         dup2(fd, 0);
16                         dup2(fd, 1);
17                         close(fd);
18                 }
19                 if (flags & RUN_GIT_CMD) {
20                         execv_git_cmd(argv);
21                 } else {
22                         execvp(argv[0], (char *const*) argv);
23                 }
24                 die("exec %s failed.", argv[0]);
25         }
26         for (;;) {
27                 int status, code;
28                 int retval = waitpid(pid, &status, 0);
29
30                 if (retval < 0) {
31                         if (errno == EINTR)
32                                 continue;
33                         error("waitpid failed (%s)", strerror(retval));
34                         return -ERR_RUN_COMMAND_WAITPID;
35                 }
36                 if (retval != pid)
37                         return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
38                 if (WIFSIGNALED(status))
39                         return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
40
41                 if (!WIFEXITED(status))
42                         return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
43                 code = WEXITSTATUS(status);
44                 if (code)
45                         return -code;
46                 return 0;
47         }
48 }
49
50 int run_command_v(int argc, const char **argv)
51 {
52         return run_command_v_opt(argc, argv, 0);
53 }
54
55 int run_command(const char *cmd, ...)
56 {
57         int argc;
58         const char *argv[MAX_RUN_COMMAND_ARGS];
59         const char *arg;
60         va_list param;
61
62         va_start(param, cmd);
63         argv[0] = (char*) cmd;
64         argc = 1;
65         while (argc < MAX_RUN_COMMAND_ARGS) {
66                 arg = argv[argc++] = va_arg(param, char *);
67                 if (!arg)
68                         break;
69         }
70         va_end(param);
71         if (MAX_RUN_COMMAND_ARGS <= argc)
72                 return error("too many args to run %s", cmd);
73         return run_command_v_opt(argc, argv, 0);
74 }