bitbake: toastergui: provide download file capability

We add, for the localhost environments, the capability to
download build artifacts. This is a pontentially dangerous API,
because it gives unrestricted read access to the build environment
file system - do not expose the functionality directly to the
web layer, but use filtering/translation code, such as
exemplified in the build_artifact view.

The capability for remote build environments is dependent
on bug 6835, as to use the collect storage as intermediary
storage for serving files.

[YOCTO #6834]

(Bitbake rev: 5fce7f6e83c6143244faa9618b7ed20c1106e08f)

Signed-off-by: Alexandru DAMIAN <alexandru.damian@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/toaster/bldcontrol/models.py

@@ -40,6 +40,19 @@ class BuildEnvironment(models.Model):
     updated     = models.DateTimeField(auto_now = True)
 
 
+    def get_artifact_type(self, path):
+        if self.betype == BuildEnvironment.TYPE_LOCAL:
+            import magic
+            m = magic.open(magic.MAGIC_MIME_TYPE)
+            m.load()
+            return m.file(path)
+        raise Exception("FIXME: not implemented")
+
+    def get_artifact(self, path):
+        if self.betype == BuildEnvironment.TYPE_LOCAL:
+            return open(path, "r")
+        raise Exception("FIXME: not implemented")
+
 # a BuildRequest is a request that the scheduler will build using a BuildEnvironment
 # the build request queue is the table itself, ordered by state