Windows: Implement start_command().

[git.git] / run-command.c

diff --git a/run-command.c b/run-command.c
index 476d00c2182e3af82a0cfe495c61c9df1eb44d26..dd8b7751ceed0870c086f61766fecd50d4d1b176 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -20,12 +20,19 @@ int start_command(struct child_process *cmd)
        int need_in, need_out, need_err;
        int fdin[2], fdout[2], fderr[2];
 
+       /*
+        * In case of errors we must keep the promise to close FDs
+        * that have been passed in via ->in and ->out.
+        */
+
        need_in = !cmd->no_stdin && cmd->in < 0;
        if (need_in) {
-               if (pipe(fdin) < 0)
+               if (pipe(fdin) < 0) {
+                       if (cmd->out > 0)
+                               close(cmd->out);
                        return -ERR_RUN_COMMAND_PIPE;
+               }
                cmd->in = fdin[1];
-               cmd->close_in = 1;
        }
 
        need_out = !cmd->no_stdout
@@ -35,10 +42,11 @@ int start_command(struct child_process *cmd)
                if (pipe(fdout) < 0) {
                        if (need_in)
                                close_pair(fdin);
+                       else if (cmd->in)
+                               close(cmd->in);
                        return -ERR_RUN_COMMAND_PIPE;
                }
                cmd->out = fdout[0];
-               cmd->close_out = 1;
        }
 
        need_err = !cmd->no_stderr && cmd->err < 0;
@@ -46,24 +54,19 @@ int start_command(struct child_process *cmd)
                if (pipe(fderr) < 0) {
                        if (need_in)
                                close_pair(fdin);
+                       else if (cmd->in)
+                               close(cmd->in);
                        if (need_out)
                                close_pair(fdout);
+                       else if (cmd->out)
+                               close(cmd->out);
                        return -ERR_RUN_COMMAND_PIPE;
                }
                cmd->err = fderr[0];
        }
 
+#ifndef __MINGW32__
        cmd->pid = fork();
-       if (cmd->pid < 0) {
-               if (need_in)
-                       close_pair(fdin);
-               if (need_out)
-                       close_pair(fdout);
-               if (need_err)
-                       close_pair(fderr);
-               return -ERR_RUN_COMMAND_FORK;
-       }
-
        if (!cmd->pid) {
                if (cmd->no_stdin)
                        dup_devnull(0);
@@ -75,6 +78,13 @@ int start_command(struct child_process *cmd)
                        close(cmd->in);
                }
 
+               if (cmd->no_stderr)
+                       dup_devnull(2);
+               else if (need_err) {
+                       dup2(fderr[1], 2);
+                       close_pair(fderr);
+               }
+
                if (cmd->no_stdout)
                        dup_devnull(1);
                else if (cmd->stdout_to_stderr)
@@ -87,13 +97,6 @@ int start_command(struct child_process *cmd)
                        close(cmd->out);
                }
 
-               if (cmd->no_stderr)
-                       dup_devnull(2);
-               else if (need_err) {
-                       dup2(fderr[1], 2);
-                       close_pair(fderr);
-               }
-
                if (cmd->dir && chdir(cmd->dir))
                        die("exec %s: cd to %s failed (%s)", cmd->argv[0],
                            cmd->dir, strerror(errno));
@@ -112,6 +115,88 @@ int start_command(struct child_process *cmd)
                }
                die("exec %s failed.", cmd->argv[0]);
        }
+#else
+       int s0 = -1, s1 = -1, s2 = -1;  /* backups of stdin, stdout, stderr */
+       const char *sargv0 = cmd->argv[0];
+       char **env = environ;
+       struct strbuf git_cmd;
+
+       if (cmd->no_stdin) {
+               s0 = dup(0);
+               dup_devnull(0);
+       } else if (need_in) {
+               s0 = dup(0);
+               dup2(fdin[0], 0);
+       } else if (cmd->in) {
+               s0 = dup(0);
+               dup2(cmd->in, 0);
+       }
+
+       if (cmd->no_stderr) {
+               s2 = dup(2);
+               dup_devnull(2);
+       } else if (need_err) {
+               s2 = dup(2);
+               dup2(fderr[1], 2);
+       }
+
+       if (cmd->no_stdout) {
+               s1 = dup(1);
+               dup_devnull(1);
+       } else if (cmd->stdout_to_stderr) {
+               s1 = dup(1);
+               dup2(2, 1);
+       } else if (need_out) {
+               s1 = dup(1);
+               dup2(fdout[1], 1);
+       } else if (cmd->out > 1) {
+               s1 = dup(1);
+               dup2(cmd->out, 1);
+       }
+
+       if (cmd->dir)
+               die("chdir in start_command() not implemented");
+       if (cmd->env) {
+               env = copy_environ();
+               for (; *cmd->env; cmd->env++)
+                       env = env_setenv(env, *cmd->env);
+       }
+
+       if (cmd->git_cmd) {
+               strbuf_init(&git_cmd, 0);
+               strbuf_addf(&git_cmd, "git-%s", cmd->argv[0]);
+               cmd->argv[0] = git_cmd.buf;
+       }
+
+       cmd->pid = spawnvpe(_P_NOWAIT, cmd->argv[0], cmd->argv, (const char **)env);
+
+       if (cmd->env)
+               free_environ(env);
+       if (cmd->git_cmd)
+               strbuf_release(&git_cmd);
+
+       cmd->argv[0] = sargv0;
+       if (s0 >= 0)
+               dup2(s0, 0), close(s0);
+       if (s1 >= 0)
+               dup2(s1, 1), close(s1);
+       if (s2 >= 0)
+               dup2(s2, 2), close(s2);
+#endif
+
+       if (cmd->pid < 0) {
+               if (need_in)
+                       close_pair(fdin);
+               else if (cmd->in)
+                       close(cmd->in);
+               if (need_out)
+                       close_pair(fdout);
+               else if (cmd->out)
+                       close(cmd->out);
+               if (need_err)
+                       close_pair(fderr);
+               return -ERR_RUN_COMMAND_FORK;
+       }
 
        if (need_in)
                close(fdin[0]);
@@ -120,7 +205,7 @@ int start_command(struct child_process *cmd)
 
        if (need_out)
                close(fdout[1]);
-       else if (cmd->out > 1)
+       else if (cmd->out)
                close(cmd->out);
 
        if (need_err)
@@ -157,10 +242,6 @@ static int wait_or_whine(pid_t pid)
 
 int finish_command(struct child_process *cmd)
 {
-       if (cmd->close_in)
-               close(cmd->in);
-       if (cmd->close_out)
-               close(cmd->out);
        return wait_or_whine(cmd->pid);
 }