[OE-core] [wic][PATCH 4/6] wic: Implement image compressing

[Philip Balister]

Can you add a way to enable multiple threads for xz? I found this helps
speed up file creation.

Philip

On 06/23/2015 05:53 AM, Ed Bartosh wrote:
> Implemented compressing result image with specified compressor.
> Updated reporting code to show compressed image.
> 
> [YOCTO #7593]
> 
> Signed-off-by: Ed Bartosh <ed.bartosh at linux.intel.com>
> 
> diff --git a/scripts/lib/wic/imager/direct.py b/scripts/lib/wic/imager/direct.py
> index f3f20e0..2ea7e4e 100644
> --- a/scripts/lib/wic/imager/direct.py
> +++ b/scripts/lib/wic/imager/direct.py
> @@ -33,6 +33,7 @@ from wic.utils.partitionedfs import Image
>  from wic.utils.errors import CreatorError, ImageError
>  from wic.imager.baseimager import BaseImageCreator
>  from wic.plugin import pluginmgr
> +from wic.utils.oe.misc import exec_cmd
>  
>  disk_methods = {
>      "do_install_disk":None,
> @@ -71,6 +72,7 @@ class DirectImageCreator(BaseImageCreator):
>          self.bootimg_dir = bootimg_dir
>          self.kernel_dir = kernel_dir
>          self.native_sysroot = native_sysroot
> +        self.compressor = compressor
>  
>      def __get_part_num(self, num, parts):
>          """calculate the real partition number, accounting for partitions not
> @@ -318,6 +320,13 @@ class DirectImageCreator(BaseImageCreator):
>                                                          self.bootimg_dir,
>                                                          self.kernel_dir,
>                                                          self.native_sysroot)
> +        # Compress the image
> +        if self.compressor:
> +            for disk_name, disk in self.__image.disks.items():
> +                full_path = self._full_path(self.__imgdir, disk_name, "direct")
> +                msger.debug("Compressing disk %s with %s" % \
> +                            (disk_name, self.compressor))
> +                exec_cmd("%s %s" % (self.compressor, full_path))
>  
>      def print_outimage_info(self):
>          """
> @@ -328,7 +337,11 @@ class DirectImageCreator(BaseImageCreator):
>          parts = self._get_parts()
>  
>          for disk_name, disk in self.__image.disks.items():
> -            full_path = self._full_path(self.__imgdir, disk_name, "direct")
> +            extension = "direct" + {"gzip": ".gz",
> +                                    "bzip2": ".bz2",
> +                                    "xz": ".xz",
> +                                    "": ""}.get(self.compressor)
> +            full_path = self._full_path(self.__imgdir, disk_name, extension)
>              msg += '  %s\n\n' % full_path
>  
>          msg += 'The following build artifacts were used to create the image(s):\n'
>