Don't smash stack when $GIT_ALTERNATE_OBJECT_DIRECTORIES is too long

[git.git] / run-command.c

diff --git a/run-command.c b/run-command.c
index bef9775e0807200e07c9780c69e3e1bda0c6c874..eff523e191b35385895f6b077fc76c7c21819012 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -8,11 +8,19 @@ static inline void close_pair(int fd[2])
        close(fd[1]);
 }
 
+static inline void dup_devnull(int to)
+{
+       int fd = open("/dev/null", O_RDWR);
+       dup2(fd, to);
+       close(fd);
+}
+
 int start_command(struct child_process *cmd)
 {
-       int need_in = !cmd->no_stdin && cmd->in < 0;
-       int fdin[2];
+       int need_in, need_out;
+       int fdin[2], fdout[2];
 
+       need_in = !cmd->no_stdin && cmd->in < 0;
        if (need_in) {
                if (pipe(fdin) < 0)
                        return -ERR_RUN_COMMAND_PIPE;
@@ -20,19 +28,32 @@ int start_command(struct child_process *cmd)
                cmd->close_in = 1;
        }
 
+       need_out = !cmd->no_stdout
+               && !cmd->stdout_to_stderr
+               && cmd->out < 0;
+       if (need_out) {
+               if (pipe(fdout) < 0) {
+                       if (need_in)
+                               close_pair(fdin);
+                       return -ERR_RUN_COMMAND_PIPE;
+               }
+               cmd->out = fdout[0];
+               cmd->close_out = 1;
+       }
+
        cmd->pid = fork();
        if (cmd->pid < 0) {
                if (need_in)
                        close_pair(fdin);
+               if (need_out)
+                       close_pair(fdout);
                return -ERR_RUN_COMMAND_FORK;
        }
 
        if (!cmd->pid) {
-               if (cmd->no_stdin) {
-                       int fd = open("/dev/null", O_RDWR);
-                       dup2(fd, 0);
-                       close(fd);
-               } else if (need_in) {
+               if (cmd->no_stdin)
+                       dup_devnull(0);
+               else if (need_in) {
                        dup2(fdin[0], 0);
                        close_pair(fdin);
                } else if (cmd->in) {
@@ -40,8 +61,18 @@ int start_command(struct child_process *cmd)
                        close(cmd->in);
                }
 
-               if (cmd->stdout_to_stderr)
+               if (cmd->no_stdout)
+                       dup_devnull(1);
+               else if (cmd->stdout_to_stderr)
                        dup2(2, 1);
+               else if (need_out) {
+                       dup2(fdout[1], 1);
+                       close_pair(fdout);
+               } else if (cmd->out > 1) {
+                       dup2(cmd->out, 1);
+                       close(cmd->out);
+               }
+
                if (cmd->git_cmd) {
                        execv_git_cmd(cmd->argv);
                } else {
@@ -55,6 +86,11 @@ int start_command(struct child_process *cmd)
        else if (cmd->in)
                close(cmd->in);
 
+       if (need_out)
+               close(fdout[1]);
+       else if (cmd->out > 1)
+               close(cmd->out);
+
        return 0;
 }
 
@@ -62,6 +98,8 @@ int finish_command(struct child_process *cmd)
 {
        if (cmd->close_in)
                close(cmd->in);
+       if (cmd->close_out)
+               close(cmd->out);
 
        for (;;) {
                int status, code;