common/exec.c

   1 #include "cache.h"
   2
   3 #include "debug.h"
   4 #include "systeminfo.h"
   5 #include "exec.h"
   6
   7 #define MAX_PROCESSING_TIME     (60 * 1000)
   8 #define MAX_ARGS                32
   9
  10 /* copy from run-command.c */
  11 static inline void close_pair(int fd[2])
  12 {
  13         close(fd[0]);
  14         close(fd[1]);
  15 }
  16
  17 int exec_program(const char *working_directory,
  18         struct strbuf *output, struct strbuf *error_output,
  19         int flags, ...)
  20 {
  21         int fdout[2], fderr[2];
  22         int s0 = -1, s1 = -1, s2 = -1;  /* backups of stdin, stdout, stderr */
  23
  24         va_list params;
  25         const char *argv[MAX_ARGS];
  26         char *arg;
  27         int argc = 0;
  28
  29         pid_t pid;
  30         int status = 0;
  31         int ret;
  32
  33         reporter *debug = QUIETMODE & flags ? debug_git : debug_git_mbox;
  34
  35         if (!git_path()) {
  36                 debug("[ERROR] Could not find git path");
  37                 return -1;
  38         }
  39
  40         if (output) {
  41                 if (pipe(fdout) < 0) {
  42                         return -ERR_RUN_COMMAND_PIPE;
  43                 }
  44                 s1 = dup(1);
  45                 dup2(fdout[1], 1);
  46
  47                 flags |= WAITMODE;
  48         }
  49
  50         if (error_output) {
  51                 if (pipe(fderr) < 0) {
  52                         if (output)
  53                                 close_pair(fdout);
  54                         return -ERR_RUN_COMMAND_PIPE;
  55                 }
  56                 s2 = dup(2);
  57                 dup2(fderr[1], 2);
  58
  59                 flags |= WAITMODE;
  60         }
  61
  62         va_start(params, flags);
  63         do {
  64                 arg = va_arg(params, char*);
  65                 argv[argc++] = arg;
  66         } while (argc < MAX_ARGS && arg);
  67         va_end(params);
  68
  69         pid = fork_process(argv[0], argv, working_directory);
  70
  71         if (s1 >= 0)
  72                 dup2(s1, 1), close(s1);
  73         if (s2 >= 0)
  74                 dup2(s2, 2), close(s2);
  75
  76         if (pid < 0) {
  77                 if (output)
  78                         close_pair(fdout);
  79                 if (error_output)
  80                         close_pair(fderr);
  81                 return -ERR_RUN_COMMAND_FORK;
  82         }
  83
  84         if (output)
  85                 close(fdout[1]);
  86         if (error_output)
  87                 close(fderr[1]);
  88
  89         if (WAITMODE & flags) {
  90                 ret = wait_for_process(pid, MAX_PROCESSING_TIME,
  91                                 &status);
  92                 if (ret) {
  93                         if (ret < 0) {
  94                                 debug_git("[ERROR] wait_for_process failed (%d); "
  95                                         "wd: %s; cmd: %s",
  96                                         status,
  97                                         working_directory,
  98                                         argv[0]);
  99
 100                                 status = -1;
 101                         }
 102
 103                         if (output) {
 104                                 strbuf_read(output, fdout[0], 0);
 105                                 debug_git("STDOUT:\r\n%s\r\n*** end of STDOUT ***\r\n", output->buf);
 106                         }
 107
 108                         if (error_output) {
 109                                 strbuf_read(error_output, fderr[0], 0);
 110                                 debug_git("STDERR:\r\n%s\r\n*** end of STDERR ***\r\n", error_output->buf);
 111                         }
 112                 } else {
 113                         status = -ERR_RUN_COMMAND_WAITPID_NOEXIT;
 114                         debug_git("[ERROR] process timed out; "
 115                                 "wd: %s; cmd: %s",
 116                                 working_directory, argv[0]);
 117                 }
 118         }
 119
 120         if (output)
 121                 close(fdout[0]);
 122         if (error_output)
 123                 close(fderr[0]);
 124
 125         return status;
 126 }