[gnome-builder] threading: add simple API to check if a TTY is needed

[Christian Hergert <chergert src gnome org>]

commit efb92b702d6e85684cce775f525b161f59c3410b
Author: Christian Hergert <chergert redhat com>
Date:   Mon Feb 18 16:55:05 2019 -0800

    threading: add simple API to check if a TTY is needed
    
    This is mostly just to give launcher subclasses an easy way to determine
    if they need a TTY. For example, podman can use --tty.

 src/libide/threading/ide-subprocess-launcher.c | 36 ++++++++++++++++++++++++++
 src/libide/threading/ide-subprocess-launcher.h |  2 ++
 2 files changed, 38 insertions(+)
---
diff --git a/src/libide/threading/ide-subprocess-launcher.c b/src/libide/threading/ide-subprocess-launcher.c
index 6e7f7aacf..f116a94a1 100644
--- a/src/libide/threading/ide-subprocess-launcher.c
+++ b/src/libide/threading/ide-subprocess-launcher.c
@@ -1071,3 +1071,39 @@ ide_subprocess_launcher_append_path (IdeSubprocessLauncher *self,
       ide_subprocess_launcher_setenv (self, "PATH", path, TRUE);
     }
 }
+
+gboolean
+ide_subprocess_launcher_get_needs_tty (IdeSubprocessLauncher *self)
+{
+  IdeSubprocessLauncherPrivate *priv = ide_subprocess_launcher_get_instance_private (self);
+
+  g_return_val_if_fail (IDE_IS_SUBPROCESS_LAUNCHER (self), FALSE);
+
+  if ((priv->stdin_fd != -1 && isatty (priv->stdin_fd)) ||
+      (priv->stdout_fd != -1 && isatty (priv->stdout_fd)) ||
+      (priv->stderr_fd != -1 && isatty (priv->stderr_fd)))
+    return TRUE;
+
+  if (priv->fd_mapping != NULL)
+    {
+      for (guint i = 0; i < priv->fd_mapping->len; i++)
+        {
+          const FdMapping *fdmap = &g_array_index (priv->fd_mapping, FdMapping, i);
+
+          switch (fdmap->dest_fd)
+            {
+            case STDIN_FILENO:
+            case STDOUT_FILENO:
+            case STDERR_FILENO:
+              if (isatty (fdmap->source_fd))
+                return TRUE;
+              break;
+
+            default:
+              break;
+            }
+        }
+    }
+
+  return FALSE;
+}
diff --git a/src/libide/threading/ide-subprocess-launcher.h b/src/libide/threading/ide-subprocess-launcher.h
index 6bcc52700..2bc172d6f 100644
--- a/src/libide/threading/ide-subprocess-launcher.h
+++ b/src/libide/threading/ide-subprocess-launcher.h
@@ -131,5 +131,7 @@ void                   ide_subprocess_launcher_take_stdout_fd       (IdeSubproce
 IDE_AVAILABLE_IN_3_32
 void                   ide_subprocess_launcher_take_stderr_fd       (IdeSubprocessLauncher  *self,
                                                                      gint                    stderr_fd);
+IDE_AVAILABLE_IN_3_32
+gboolean               ide_subprocess_launcher_get_needs_tty        (IdeSubprocessLauncher  *self);
 
 G_END_DECLS