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[Qemu-devel] qemu-img help missing backing file


From: Alexander Graf
Subject: [Qemu-devel] qemu-img help missing backing file
Date: Tue, 30 Mar 2010 14:22:55 +0200

Howdy,

I just wanted to create a backed qcow2 image and was irritated by qemu-img not 
showing me the correct command line option. It's just missing from the list:

> address@hidden:~/git/qemu> ./qemu-img --help
> qemu-img version 0.12.50, Copyright (c) 2004-2008 Fabrice Bellard
> usage: qemu-img command [command options]
> QEMU disk image utility
> 
> Command syntax:
>   check [-f fmt] filename
>   create [-f fmt] [-o options] filename [size]

^- missing -b

>   commit [-f fmt] filename
>   convert [-c] [-f fmt] [-O output_fmt] [-o options] filename [filename2 
> [...]] output_filename
>   info [-f fmt] filename
>   snapshot [-l | -a snapshot | -c snapshot | -d snapshot] filename
>   rebase [-f fmt] [-u] -b backing_file [-F backing_fmt] filename
> 
> Command parameters:
>   'filename' is a disk image filename
>   'fmt' is the disk image format. It is guessed automatically in most cases
>   'size' is the disk image size in bytes. Optional suffixes
>     'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)
>     and T (terabyte, 1024G) are supported. 'b' is ignored.
>   'output_filename' is the destination disk image filename
>   'output_fmt' is the destination format
>   'options' is a comma separated list of format specific options in a
>     name=value format. Use -o ? for an overview of the options supported by 
> the
>     used format
>   '-c' indicates that target image must be compressed (qcow format only)
>   '-u' enables unsafe rebasing. It is assumed that old and new backing file
>        match exactly. The image doesn't need a working backing file before
>        rebasing in this case (useful for renaming the backing file)
>   '-h' with or without a command shows this help and lists the supported 
> formats

^- missing -b

> 
> Parameters to snapshot subcommand:
>   'snapshot' is the name of the snapshot to create, apply or delete
>   '-a' applies a snapshot (revert disk to saved state)
>   '-c' creates a snapshot
>   '-d' deletes a snapshot
>   '-l' lists all snapshots in the given image
> 
> Supported formats: cow qcow vdi vmdk cloop dmg bochs vpc vvfat qcow2 
> parallels nbd host_cdrom host_floppy host_device raw

Is this intentional? The actual command still works:

> address@hidden:~/git/qemu> qemu-img-kvm create -f qcow2 -b 
> /media/studio/images/SUSE/s390/sles11.raw /dev/shm/sles11-zipl.qcow2
> Formatting '/dev/shm/sles11-zipl.qcow2', fmt=qcow2 size=21474836480 
> backing_file='/media/studio/images/SUSE/s390/sles11.raw' encryption=off 
> cluster_size=0 


Alex



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