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由 Chris Lalancette 提交于
Implement a compressed save image format for qemu. While ideally we would have the choice between compressed/non-compressed available to the libvirt API, unfortunately there is no "flags" parameter to the virDomainSave() API. Therefore, implement this as a qemu.conf option. gzip, bzip2, and lzma are implemented, and it should be very easy to implement additional compression methods. One open question is if/how we should detect the compression binaries. One way to do it is to do compile-time setting of the paths (via configure.in), but that doesn't seem like a great thing to do. My preferred solution is not to detect at all; when we go to run the commands that need them, if they aren't available, or aren't available in one of the standard paths, then we'll fail. That's also the solution implemented in this patch. In the future, we'll have a more robust (managed) save/restore API, at which time we can expose this functionality properly in the API. V2: get rid of redundant dd command and just use >> to append data. V3: Add back the missing pieces for the enum and bumping the save version. V4: Make the compressed field in the save_header an int. Implement LZMA compression. Signed-off-by: NChris Lalancette <clalance@redhat.com>
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