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:
> ag...@s390t27:~/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: > ag...@s390t27:~/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
