Why is it bad to rewind a branch that has already been pushed out?
[git] / run-command.c
1 #include "cache.h"
2 #include "run-command.h"
3 #include "exec_cmd.h"
4
5 int run_command_v_opt(const 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_STDIN) {
13                         int fd = open("/dev/null", O_RDWR);
14                         dup2(fd, 0);
15                         close(fd);
16                 }
17                 if (flags & RUN_COMMAND_STDOUT_TO_STDERR)
18                         dup2(2, 1);
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                 pid_t waiting = waitpid(pid, &status, 0);
29
30                 if (waiting < 0) {
31                         if (errno == EINTR)
32                                 continue;
33                         error("waitpid failed (%s)", strerror(errno));
34                         return -ERR_RUN_COMMAND_WAITPID;
35                 }
36                 if (waiting != 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(const char **argv)
51 {
52         return run_command_v_opt(argv, 0);
53 }
54
55 static int run_command_va_opt(int opt, const char *cmd, va_list param)
56 {
57         int argc;
58         const char *argv[MAX_RUN_COMMAND_ARGS];
59         const char *arg;
60
61         argv[0] = (char*) cmd;
62         argc = 1;
63         while (argc < MAX_RUN_COMMAND_ARGS) {
64                 arg = argv[argc++] = va_arg(param, char *);
65                 if (!arg)
66                         break;
67         }
68         if (MAX_RUN_COMMAND_ARGS <= argc)
69                 return error("too many args to run %s", cmd);
70         return run_command_v_opt(argv, opt);
71 }
72
73 int run_command_opt(int opt, const char *cmd, ...)
74 {
75         va_list params;
76         int r;
77
78         va_start(params, cmd);
79         r = run_command_va_opt(opt, cmd, params);
80         va_end(params);
81         return r;
82 }
83
84 int run_command(const char *cmd, ...)
85 {
86         va_list params;
87         int r;
88
89         va_start(params, cmd);
90         r = run_command_va_opt(0, cmd, params);
91         va_end(params);
92         return r;
93 }