Previously the user would have to manually decompress an input image prior to
handing it over to mender-convert. With this change, files compressed in the
formats: lzma, gzip, or zip archives will be automatically decompressed,
converted, and then recompressed.
Note that the zip archive can only contain one image file, otherwise the
conversion will fail. Thus if the archive contains multiple files, human
interaction is required. This simply involves unzipping the archive yourself,
and then pass in the image, just like in the old workflow.
Ticket: https://tracker.mender.io/browse/MEN-3052
Changelog: Added automatic decompression of input images, so that the convert
tool now accepts compressed input images in the formats: lzma, gzip, and zip.
The images will also be recompressed to the input format automatically.
Signed-off-by: Ole Petter <ole.orhagen@northern.tech>