[Qemu-devel] [PATCH v10 0/4] Add subcommand compare for qemu-img

[Miroslav Rezanina]

This is 10th version of patch adding compare subcommand that
compares two images. Compare has following criteria:
 - only data part is compared
 - unallocated sectors are not read
 to be zeroed/unallocated to compare rest
 - qemu-img returns:
    - 0 if images are identical
    - 1 if images differ
    - >2 error on execution

v10:
 - rebased to kwolf's block-next branch due to conflict patch (patch 2)
 - exit status updates (patch 3)
 - minor non-functional fixes

v9:
 - Merged patch 3 and 4 (subcommmand implementation and documentation) of v8
 - Added basic test for qemu-img compare
 - Fixed incorrect indentation
 - add bdrv_is_allocated_above() return value check
 - Add description of exit codes into the documentation
 - minor non-functional changes

v8:
 - minor grammar fixes (no behavior change)
 
v7:
 - split patch into pieces
 - Quiet mode added for all relevant subcommands
 - check non-shared part of disk after shared one
 - minor docummentation and naming fixes

v6:
 - added handling -?, -h options for compare subcommand

v5 (only minor changes):
 - removed redundant comment
 - removed dead code (goto after help())
 - set final total_sectors on first assignment

v4:
 - Fixed various typos
 - Added functions for empty sector check and sector-to-bytes offset
 conversion
 - Fixed command-line parameters processing

v3:
 - options -f/-F are orthogonal
 - documentation updated to new syntax and behavior
 - used byte offset instead of sector number for output
 
v2:
 - changed option for second image format to -F
 - changed handling of -f and -F [1]
 - added strict mode (-s)
 - added quiet mode (-q)
 - improved output messages [2]
 - rename variables for larger image handling
 - added man page content

Signed-off-by: Miroslav Rezanina <address@hidden>

Miroslav Rezanina (4):
  block: Add synchronous wrapper for bdrv_co_is_allocated_above
  qemu-img: Add "Quiet mode" option
  This patch adds new qemu-img subcommand that compares content of two
    disk     images.
  qemu-iotests: Add qemu-img compare test

 block.c                    |   51 +++++-
 blockdev.c                 |    6 +-
 include/block/block.h      |    5 +-
 qemu-img-cmds.hx           |   34 ++--
 qemu-img.c                 |  441 +++++++++++++++++++++++++++++++++++++++-----
 qemu-img.texi              |   56 ++++++
 tests/qemu-iotests/048     |   77 ++++++++
 tests/qemu-iotests/048.out |   25 +++
 tests/qemu-iotests/group   |    1 +
 9 files changed, 626 insertions(+), 70 deletions(-)
 create mode 100755 tests/qemu-iotests/048
 create mode 100644 tests/qemu-iotests/048.out