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qemu-img: add skip option to dd

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This adds the skip option which allows qemu-img dd to skip a number of blocks
before copying the input.

A test case was added to test the skip option.

Signed-off-by: Reda Sallahi <fullmanet@gmail.com>
Message-id: 20160810141609.32727-1-fullmanet@gmail.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Reda Sallahi 2016-08-10 16:16:09 +02:00 • committed by Max Reitz
parent 86ce1f6e2b
commit f7c1553388
6 changed files with 174 additions and 8 deletions
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4
qemu-img.texi
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@ -151,6 +151,8 @@ sets the number of input blocks to copy
sets the input file
@item of=@var{output}
sets the output file
@item skip=@var{blocks}
sets the number of input blocks to skip
@end table
Command description:
@ -324,7 +326,7 @@ skipped. This is useful for formats such as @code{rbd} if the target
volume has already been created with site specific options that cannot
be supplied through qemu-img.
@item dd [-f @var{fmt}] [-O @var{output_fmt}] [bs=@var{block_size}] [count=@var{blocks}] if=@var{input} of=@var{output}
@item dd [-f @var{fmt}] [-O @var{output_fmt}] [bs=@var{block_size}] [count=@var{blocks}] [skip=@var{blocks}] if=@var{input} of=@var{output}
Dd copies from @var{input} file to @var{output} file converting it from
@var{fmt} format to @var{output_fmt} format.