wic: add fsimage plugin

The fsimage plugin allows to add an already existing filesystem image in
the partition layout.

(From OE-Core rev: b49e5af8c6ef0abaabce36e5e7d8ddc399e02f53)

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/wic/plugins/source/fsimage.py

@@ -0,0 +1,70 @@
+# ex:ts=4:sw=4:sts=4:et
+# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+
+import os
+import re
+
+from wic import msger
+from wic.pluginbase import SourcePlugin
+from wic.utils.oe.misc import *
+
+class FSImagePlugin(SourcePlugin):
+    name = 'fsimage'
+
+    @classmethod
+    def do_install_disk(self, disk, disk_name, cr, workdir, oe_builddir,
+                        bootimg_dir, kernel_dir, native_sysroot):
+        """
+        Called after all partitions have been prepared and assembled into a
+        disk image. Do nothing.
+        """
+        pass
+
+    @classmethod
+    def do_configure_partition(self, part, source_params, cr, cr_workdir,
+                               oe_builddir, bootimg_dir, kernel_dir,
+                               native_sysroot):
+        """
+        Called before do_prepare_partition(). Possibly prepare
+        configuration files of some sort.
+        """
+        pass
+
+    @classmethod
+    def do_prepare_partition(self, part, source_params, cr, cr_workdir,
+                             oe_builddir, bootimg_dir, kernel_dir,
+                             rootfs_dir, native_sysroot):
+        """
+        Called to do the actual content population for a partition i.e. it
+        'prepares' the partition to be incorporated into the image.
+        """
+        if not bootimg_dir:
+            bootimg_dir = get_bitbake_var("DEPLOY_DIR_IMAGE")
+            if not bootimg_dir:
+                msger.error("Couldn't find DEPLOY_DIR_IMAGE, exiting\n")
+
+        msger.debug('Bootimg dir: %s' % bootimg_dir)
+
+        if ('file' not in source_params):
+            msger.error("No file specified\n")
+            return
+
+        src = os.path.join(bootimg_dir, source_params['file'])
+
+
+        msger.debug('Preparing partition using image %s' % (src))
+        part.prepare_rootfs_from_fs_image(cr_workdir, src, "")