[gnome-ostree] make: Tail output of task by default

[Colin Walters <walters src gnome org>]

commit c1fed11c64e89d551a357f7fb2c1384e31f92f53
Author: Colin Walters <walters verbum org>
Date:   Thu Feb 21 08:55:49 2013 -0500

    make: Tail output of task by default
    
    Just nicer.

 src/ostbuild/js/builtins/make.js |   11 +++++++++++
 src/ostbuild/js/task.js          |    2 +-
 2 files changed, 12 insertions(+), 1 deletions(-)
---
diff --git a/src/ostbuild/js/builtins/make.js b/src/ostbuild/js/builtins/make.js
index 9ee9901..93dcfae 100644
--- a/src/ostbuild/js/builtins/make.js
+++ b/src/ostbuild/js/builtins/make.js
@@ -51,6 +51,7 @@ const Make = new Lang.Class({
        let taskmaster = new Task.TaskMaster(this.workdir.get_child('tasks'),
                                             { onEmpty: Lang.bind(this, this._onTasksComplete) });
        this._taskmaster = taskmaster;
+       taskmaster.connect('task-executing', Lang.bind(this, this._onTaskExecuting));
        taskmaster.connect('task-complete', Lang.bind(this, this._onTaskCompleted));
        let params = {};
        for (let i = 0; i < args.parameters.length; i++) { 
@@ -69,7 +70,17 @@ const Make = new Lang.Class({
            print("Success!")
     },
 
+    _onTaskExecuting: function(taskmaster, task) {
+       let workdir = task._workdir;
+       print("Task " + task.name + " executing in " + workdir.get_path());
+       let output = workdir.get_child('output.txt');
+       let context = new GSystem.SubprocessContext({ argv: ['tail', '-f', output.get_path() ] });
+       this._tail = new GSystem.Subprocess({ context: context });
+       this._tail.init(null);
+    },
+
     _onTaskCompleted: function(taskmaster, task, success, error) {
+       this._tail.request_exit();
        if (success) {
            print("Task " + task.name + " complete: " + task._workdir.get_path());
        } else {
diff --git a/src/ostbuild/js/task.js b/src/ostbuild/js/task.js
index 3c81431..757e139 100644
--- a/src/ostbuild/js/task.js
+++ b/src/ostbuild/js/task.js
@@ -183,7 +183,7 @@ const TaskMaster = new Lang.Class({
               !this.isTaskExecuting(this._pendingTasksList[0].name)) {
            let task = this._pendingTasksList.shift();
            task._executeInSubprocessInternal(this.cancellable);
-           print("Task " + task.name + " running in " + task._workdir.get_path());
+           this.emit('task-executing', task);
            this._executing.push(task);
        }
     }