Strange zero block size, wic fails

[Jan Kiszka <jan.kiszka@siemens.com>]

Hi all,

any spontaneous idea what could cause such a bug?

INFO: Creating image(s)...

Traceback (most recent call last):
  File "/isar/scripts/wic", line 303, in <module>
    sys.exit(main(sys.argv[1:]))
  File "/isar/scripts/wic", line 298, in main
    return hlp.invoke_subcommand(args, parser, hlp.wic_help_usage, subcommands)
  File "/isar/scripts/lib/wic/help.py", line 97, in invoke_subcommand
    subcommands.get(args[0], subcommand_error)[0](args[1:], usage)
  File "/isar/scripts/wic", line 236, in wic_create_subcommand
    engine.wic_create(wks_file, rootfs_dir, bootimg_dir, kernel_dir, options)
  File "/isar/scripts/lib/wic/engine.py", line 191, in wic_create
    plugin.do_create()
  File "/isar/scripts/lib/wic/plugins/imager/direct.py", line 94, in do_create
    self.assemble()
  File "/isar/scripts/lib/wic/plugins/imager/direct.py", line 185, in assemble
    self._image.assemble()
  File "/isar/scripts/lib/wic/plugins/imager/direct.py", line 544, in assemble
    sparse_copy(source, self.path, part.start * self.sector_size)
  File "/isar/scripts/lib/wic/filemap.py", line 537, in sparse_copy
    fmap = api(src_fname)
  File "/isar/scripts/lib/wic/filemap.py", line 529, in filemap
    return FilemapFiemap(image, log)
  File "/isar/scripts/lib/wic/filemap.py", line 347, in __init__
    _FilemapBase.__init__(self, image, log)
  File "/isar/scripts/lib/wic/filemap.py", line 98, in __init__
    self.blocks_cnt //= self.block_size
ZeroDivisionError: integer division or modulo by zero


We confirmed via instrumentation that there is actually 0 returned by
get_block_size, more precisely when requesting the info for the
temporary boot.img.

Base system was a Debian 8.8 with latest Docker release, and the run
took place inside that container (kasproject/kas-isar:latest). I'm
currently trying to reproduce locally.

Jan

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