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This adds two new options: --format specifies the format of the
input disk, and --output-format specified the format of the output
disk.
Requiring the format of the output disk seems a bit strange at first:
after all, this is the disk that the virt-resize user has to create.
However it is needed because we sometimes reopen this disk, after
copying data over the first sector, and in theory a raw-format guest
could write a qcow2 header here and have it copied to the output
disk, which we would subsequently reopen.
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Previously we copied the bootloader data directly from the
source disk image to the target disk image using host file
operations (before launching libguestfs). This has two problems:
firstly it has no chance of working with qcow2, and secondly
it didn't behave properly with GPT.
This changes the code so that everything is done through
libguestfs. Block device sizes are now calculated properly
for qcow2 (RHBZ#633096) because this is done using the libguestfs
blockdev_getsize64 call. The partition table is still created
by parted, but to workaround a bug in parted this is done before
copying the bootloader. Finally the bootloader copy is done
using the new APIs pread-device and pwrite-device.
Shrinking now works, at least for simple cases (RHBZ#633766).
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With this commit you will see a plain progress bar during the
lengthy copy operations, similar to below:
Summary of changes:
/dev/sda1: partition will be left alone
/dev/sda2: partition will be resized from 7.5G to 9.5G
/dev/sda2: content will be expanded using the 'pvresize' method
Copying /dev/sda1 ...
[############################################################################]
Copying /dev/sda2 ...
[########################################------------------------------------]
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The documentation was previously very intimidating. Bring some
common, simple examples up to the top of the page in a separate
section.
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Fix copyright years.
Fix URLs to point to new PRC site.
Make sure guestfish(1) and guestfs(3) manpages reference the
current list of tools.
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Enhance virt-resize so it can expand "first level" partition
content, including ext/2/3/4/ntfs filesystems and PVs.
Also extensively update the documentation.
This has been tested on a variety of Linux and Windows guests.
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- copy more than 64 boot loader sectors across, since real boot
loaders (eg. for Windows) can be much larger than this
- copy bootable flag and ID byte to new partitions
- start the first partition on the new disk at the same sector
offset as on the old disk
- sync the disks before existing
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Virt-resize is the main contribution here, a program which can
be used to expand and shrink partitions in disk images.
Virt-list-partitions is used as an ancillary tool for planning
resize operations.
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