[Qemu-devel] qemu-img qcow and raw format
Hello, I'm currently developing an OS deployment tool similar to G4U (ghost for unix). This is a very basic tool - boot an initrd - configure network - ssh deployment-server cat image.dd /dev/sda - reboot I'm using qemu to test my initrd and deployment tool and i would like replace my raw image format with qcow images (size/compression and crypto) - ssh deployment-server cat image.qcow | qemu-img - -O raw /dev/sda The problem is qemu-img can't read from stdin, so i tried : - mkfifo deploy-in.fifo - qemu-img convert deploy-in.fifo -O raw /dev/sda - ssh deployment-server cat image.qcow deploy-in.fifo qemu-img: Could not open 'deploy-in.fifo' Is there any way to achieve this goal ? Cheers, François Visconte
Re: [Qemu-devel] qemu-img qcow and raw format
Creating a temp file maybe? Cheers, Gildas 2007/4/12, Francois Visconte [EMAIL PROTECTED]: Hello, I'm currently developing an OS deployment tool similar to G4U (ghost for unix). This is a very basic tool - boot an initrd - configure network - ssh deployment-server cat image.dd /dev/sda - reboot I'm using qemu to test my initrd and deployment tool and i would like replace my raw image format with qcow images (size/compression and crypto) - ssh deployment-server cat image.qcow | qemu-img - -O raw /dev/sda The problem is qemu-img can't read from stdin, so i tried : - mkfifo deploy-in.fifo - qemu-img convert deploy-in.fifo -O raw /dev/sda - ssh deployment-server cat image.qcow deploy-in.fifo qemu-img: Could not open 'deploy-in.fifo' Is there any way to achieve this goal ? Cheers, François Visconte
Re: [Qemu-devel] qemu-img qcow and raw format
Hello Creating a temp file maybe? I'm using qemu-img from an initrd so i can't create big file into a temps file. Creating a temp file may cause deployment to be 2 times longer: - ssh ... cat image.dd temp_file - qemu-img convert temp_file -O raw /dev/sda Cheers, François
Re: [Qemu-devel] qemu-img qcow and raw format
Francois Visconte [EMAIL PROTECTED] wrote: Hello, I'm currently developing an OS deployment tool similar to G4U (ghost for unix). This is a very basic tool - boot an initrd - configure network - ssh deployment-server cat image.dd /dev/sda - reboot I'm using qemu to test my initrd and deployment tool and i would like replace my raw image format with qcow images (size/compression and crypto) - ssh deployment-server cat image.qcow | qemu-img - -O raw /dev/sda The problem is qemu-img can't read from stdin, so i tried : - mkfifo deploy-in.fifo - qemu-img convert deploy-in.fifo -O raw /dev/sda - ssh deployment-server cat image.qcow deploy-in.fifo qemu-img: Could not open 'deploy-in.fifo' I have not looked at the code in qemu-img (and the associated routines). It appears that qemu-img is probably looking for a file handle and not a named pipe. Either that, or you need to shove the ssh command in the background before the qemu-img command so qemu-img has a chance to start processing the data. It's not clear whether or not qemu-img is seeing an empty file because there's no data on the pipe, or it can't read from the pipe. Ben
Re: [Qemu-devel] qemu-img qcow and raw format
On Thu, 2007-04-12 at 10:09 +0200, Francois Visconte wrote: qemu-img: Could not open 'deploy-in.fifo' Is there any way to achieve this goal ? It strikes me that it's likely qemu-img assumes it can seek around in the file it is reading from, so perhaps you'll have to look at modifying qemu-img to support a stream mode? D. (Note this is just a guess) -- Daniel Silverstone http://www.digital-scurf.org/ PGP mail accepted and encouraged.Key Id: 2BC8 4016 2068 7895
