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authorAlberto Garcia <berto@igalia.com>2024-07-30 16:15:52 +0200
committerKevin Wolf <kwolf@redhat.com>2025-03-13 17:57:23 +0100
commitdf957115c46845e2c0ccc29ac0a75eb9700a9a0d (patch)
tree1ed27cf57691214d6ee590fa25c05c711580b113 /pc-bios/s390-ccw
parent40aa38a651a8d4ca99c70e591176a97abcae5295 (diff)
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scripts/qcow2-to-stdout.py: Add script to write qcow2 images to stdout
This tool converts a disk image to qcow2, writing the result directly to stdout. This can be used for example to send the generated file over the network. This is equivalent to using qemu-img to convert a file to qcow2 and then writing the result to stdout, with the difference that this tool does not need to create this temporary qcow2 file and therefore does not need any additional disk space. Implementing this directly in qemu-img is not really an option because it expects the output file to be seekable and it is also meant to be a generic tool that supports all combinations of file formats and image options. Instead, this tool can only produce qcow2 files with the basic options, without compression, encryption or other features. The input file is read twice. The first pass is used to determine which clusters contain non-zero data and that information is used to create the qcow2 header, refcount table and blocks, and L1 and L2 tables. After all that metadata is created then the second pass is used to write the guest data. By default qcow2-to-stdout.py expects the input to be a raw file, but if qemu-storage-daemon is available then it can also be used to read images in other formats. Alternatively the user can also run qemu-nbd or qemu-storage-daemon manually instead. Signed-off-by: Alberto Garcia <berto@igalia.com> Signed-off-by: Madeeha Javed <javed@igalia.com> Message-ID: <20240730141552.60404-1-berto@igalia.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'pc-bios/s390-ccw')
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