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This is a fairly straightforward translation of Perl virt-resize into
OCaml. It is bug-for-bug and feature-for-feature identical to the
Perl version, except as noted below.
The motivation is to have a more solid, high-level, statically safe
compiled language to go forwards with fixing some of the harder bugs
in virt-resize. In particular contracts between different parts of
the program are now handled by statically typed structures checked at
compile time, instead of the very ad-hoc unchecked hash tables used by
the Perl version.
OCaml and the ocaml-pcre library (Perl-Compatible Regular Expressions
bindings for OCaml) are required.
Extra features in this version:
- 32 bit hosts are now supported.
- We try hard to handle the case where the target disk is not "clean"
(ie. all zeroes). It usually works for this case, whereas the
previous version would usually fail. However it is still
recommended that the system administrator creates a fresh blank disk
for the target before running the program.
- User messages are a bit more verbose and helpful. You can turn
these off with the -q (--quiet) option.
There is one lost feature:
- Ability to specify >= T (terabytes) sizes in command line size
expressions has been removed. This probably didn't work in the Perl
version.
Other differences:
- The first partition on the target is no longer aligned; instead we
place it at the same sector as on the source. I suspect that
aligning it was causing the bootloader failures.
- Because it's easier, we do more sanity checking on the source disk.
This might lead to more failures, but they'd be failures you'd want
to know about.
- The order in which operations are performed has been changed to make
it more logical. The user should not notice any functional
difference, but debug messages will be quite a bit different.
- virt-resize is a compiled binary, not a script.
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This simplifies the libguestfs-test-tool program down to essentials.
Bugs most commonly occur when starting the appliance, so what we
should concentrate on test is just that.
Previously the test tool built a special static binary helper program,
packaged it up in an ISO, then ran this inside the appliance. None of
this really tested useful failure modes, but they did make the test
tool itself harder to build, harder for users to run, and more
brittle.
This change also adds some more debugging of libguestfs state.
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New Ukrainian po-docs translation added.
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This allows the default for --ro or --rw to be controlled for the
three tools guestfish, guestmount and virt-rescue.
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This API allows more than one callback to be registered for each
event, makes it possible to call the API from other languages, and
allows [nearly all] log, debug and trace messages to be rerouted from
stderr.
An older version of this API was discussed on the mailing list here:
https://www.redhat.com/archives/libguestfs/2010-December/msg00081.html
https://www.redhat.com/archives/libguestfs/2011-January/msg00012.html
This also updates guestfish to use the new API for its progress bars.
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I have diffed the output from the original virt-df with this
new version, and they agree very closely. Some differences:
- Old virt-df have a divide-by-zero error in cases where the
number of used inodes was 0. New virt-df fixes this.
- New virt-df uses gnulib human_readable library which displays
numbers to 3 significant figures for -h output (old version
used an ad hoc function).
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This tool replaces virt-list-filesystems and virt-list-partitions with
a new tool written in C with a more uniform command line structure
and output.
This existing Perl tools are deprecated but remain indefinitely.
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