common/exec.c

   1 #include "git-compat-util.h"
   2 #include "cache.h"
   3
   4 #include "debug.h"
   5 #include "systeminfo.h"
   6 #include "exec.h"
   7
   8 #define MAX_PROCESSING_TIME     (60 * 1000)
   9 #define MAX_ARGS                32
  10
  11 /* copy from run-command.c */
  12 static inline void close_pair(int fd[2])
  13 {
  14         close(fd[0]);
  15         close(fd[1]);
  16 }
  17
  18 int exec_program(const char *working_directory,
  19         struct strbuf *output, struct strbuf *error_output,
  20         int flags, ...)
  21 {
  22         va_list params;
  23         const char *argv[MAX_ARGS];
  24         char *arg;
  25         int argc = 0;
  26
  27         va_start(params, flags);
  28         do {
  29                 arg = va_arg(params, char*);
  30                 argv[argc++] = arg;
  31         } while (argc < MAX_ARGS && arg);
  32         va_end(params);
  33
  34         return exec_program_v(working_directory, output, error_output,
  35                         flags, argv);
  36 }
  37
  38 int exec_program_v(const char *working_directory,
  39         struct strbuf *output, struct strbuf *error_output,
  40         int flags, const char **argv)
  41 {
  42         int fdout[2], fderr[2];
  43         int s1 = -1, s2 = -1;   /* backups of stdin, stdout, stderr */
  44
  45         pid_t pid;
  46         int status = 0;
  47         int ret;
  48
  49         reporter *debug = QUIETMODE & flags ? debug_git : debug_git_mbox;
  50
  51         if (!git_path()) {
  52                 debug("[ERROR] Could not find git path");
  53                 return -1;
  54         }
  55
  56         if (output) {
  57                 if (pipe(fdout) < 0) {
  58                         return -ERR_RUN_COMMAND_PIPE;
  59                 }
  60                 s1 = dup(1);
  61                 dup2(fdout[1], 1);
  62
  63                 flags |= WAITMODE;
  64         }
  65
  66         if (error_output) {
  67                 if (pipe(fderr) < 0) {
  68                         if (output)
  69                                 close_pair(fdout);
  70                         return -ERR_RUN_COMMAND_PIPE;
  71                 }
  72                 s2 = dup(2);
  73                 dup2(fderr[1], 2);
  74
  75                 flags |= WAITMODE;
  76         }
  77
  78         pid = fork_process(argv[0], argv, working_directory);
  79
  80         if (s1 >= 0)
  81                 dup2(s1, 1), close(s1);
  82         if (s2 >= 0)
  83                 dup2(s2, 2), close(s2);
  84
  85         if (pid < 0) {
  86                 if (output)
  87                         close_pair(fdout);
  88                 if (error_output)
  89                         close_pair(fderr);
  90                 return -ERR_RUN_COMMAND_FORK;
  91         }
  92
  93         if (output)
  94                 close(fdout[1]);
  95         if (error_output)
  96                 close(fderr[1]);
  97
  98         if (WAITMODE & flags) {
  99                 ret = wait_for_process(pid, MAX_PROCESSING_TIME,
 100                                 &status);
 101                 if (ret) {
 102                         if (ret < 0) {
 103                                 debug_git("[ERROR] wait_for_process failed (%d); "
 104                                         "wd: %s; cmd: %s",
 105                                         status,
 106                                         working_directory,
 107                                         argv[0]);
 108
 109                                 status = -1;
 110                         }
 111
 112                         if (output) {
 113                                 strbuf_read(output, fdout[0], 0);
 114                                 debug_git("STDOUT:\r\n%s\r\n*** end of STDOUT ***\r\n", output->buf);
 115                         }
 116
 117                         if (error_output) {
 118                                 strbuf_read(error_output, fderr[0], 0);
 119                                 debug_git("STDERR:\r\n%s\r\n*** end of STDERR ***\r\n", error_output->buf);
 120                         }
 121                 } else {
 122                         status = -ERR_RUN_COMMAND_WAITPID_NOEXIT;
 123                         debug_git("[ERROR] process timed out; "
 124                                 "wd: %s; cmd: %s",
 125                                 working_directory, argv[0]);
 126                 }
 127         }
 128
 129         if (output)
 130                 close(fdout[0]);
 131         if (error_output)
 132                 close(fderr[0]);
 133
 134         return status;
 135 }