Andrew's git - gitweb.git/blob

d20a6ef80c08bcf51ab5e650875ba8994917ca70
   1#include "cache.h"
   2#include "run-command.h"
   3#include "exec_cmd.h"
   4
   5static inline void close_pair(int fd[2])
   6{
   7        close(fd[0]);
   8        close(fd[1]);
   9}
  10
  11int start_command(struct child_process *cmd)
  12{
  13        int need_in = !cmd->no_stdin && cmd->in < 0;
  14        int need_out = !cmd->stdout_to_stderr && cmd->out < 0;
  15        int fdin[2], fdout[2];
  16
  17        if (need_in) {
  18                if (pipe(fdin) < 0)
  19                        return -ERR_RUN_COMMAND_PIPE;
  20                cmd->in = fdin[1];
  21                cmd->close_in = 1;
  22        }
  23
  24        if (need_out) {
  25                if (pipe(fdout) < 0) {
  26                        if (need_in)
  27                                close_pair(fdin);
  28                        return -ERR_RUN_COMMAND_PIPE;
  29                }
  30                cmd->out = fdout[0];
  31                cmd->close_out = 1;
  32        }
  33
  34        cmd->pid = fork();
  35        if (cmd->pid < 0) {
  36                if (need_in)
  37                        close_pair(fdin);
  38                if (need_out)
  39                        close_pair(fdout);
  40                return -ERR_RUN_COMMAND_FORK;
  41        }
  42
  43        if (!cmd->pid) {
  44                if (cmd->no_stdin) {
  45                        int fd = open("/dev/null", O_RDWR);
  46                        dup2(fd, 0);
  47                        close(fd);
  48                } else if (need_in) {
  49                        dup2(fdin[0], 0);
  50                        close_pair(fdin);
  51                } else if (cmd->in) {
  52                        dup2(cmd->in, 0);
  53                        close(cmd->in);
  54                }
  55
  56                if (cmd->stdout_to_stderr)
  57                        dup2(2, 1);
  58                else if (need_out) {
  59                        dup2(fdout[1], 1);
  60                        close_pair(fdout);
  61                } else if (cmd->out > 1) {
  62                        dup2(cmd->out, 1);
  63                        close(cmd->out);
  64                }
  65
  66                if (cmd->git_cmd) {
  67                        execv_git_cmd(cmd->argv);
  68                } else {
  69                        execvp(cmd->argv[0], (char *const*) cmd->argv);
  70                }
  71                die("exec %s failed.", cmd->argv[0]);
  72        }
  73
  74        if (need_in)
  75                close(fdin[0]);
  76        else if (cmd->in)
  77                close(cmd->in);
  78
  79        if (need_out)
  80                close(fdout[1]);
  81        else if (cmd->out > 1)
  82                close(cmd->out);
  83
  84        return 0;
  85}
  86
  87int finish_command(struct child_process *cmd)
  88{
  89        if (cmd->close_in)
  90                close(cmd->in);
  91        if (cmd->close_out)
  92                close(cmd->out);
  93
  94        for (;;) {
  95                int status, code;
  96                pid_t waiting = waitpid(cmd->pid, &status, 0);
  97
  98                if (waiting < 0) {
  99                        if (errno == EINTR)
 100                                continue;
 101                        error("waitpid failed (%s)", strerror(errno));
 102                        return -ERR_RUN_COMMAND_WAITPID;
 103                }
 104                if (waiting != cmd->pid)
 105                        return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
 106                if (WIFSIGNALED(status))
 107                        return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
 108
 109                if (!WIFEXITED(status))
 110                        return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
 111                code = WEXITSTATUS(status);
 112                if (code)
 113                        return -code;
 114                return 0;
 115        }
 116}
 117
 118int run_command(struct child_process *cmd)
 119{
 120        int code = start_command(cmd);
 121        if (code)
 122                return code;
 123        return finish_command(cmd);
 124}
 125
 126int run_command_v_opt(const char **argv, int opt)
 127{
 128        struct child_process cmd;
 129        memset(&cmd, 0, sizeof(cmd));
 130        cmd.argv = argv;
 131        cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
 132        cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
 133        cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
 134        return run_command(&cmd);
 135}