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