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curl: Add usage documentation 

Signed-off-by: Matthew Booth <mbooth@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Matthew Booth 2014-05-14 19:28:43 -04:00 committed by Kevin Wolf
parent 97a3ea5719
commit 0a86cb7317
1 changed files with 68 additions and 0 deletions
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qemu-options.hx
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@ -2191,6 +2191,74 @@ qemu-system-x86_64 --drive file=gluster://192.0.2.1/testvol/a.img
@end example
See also @url{http://www.gluster.org}.
@item HTTP/HTTPS/FTP/FTPS/TFTP
QEMU supports read-only access to files accessed over http(s), ftp(s) and tftp.
Syntax using a single filename:
@example
<protocol>://[<username>[:<password>]@@]<host>/<path>
@end example
where:
@table @option
@item protocol
'http', 'https', 'ftp', 'ftps', or 'tftp'.
@item username
Optional username for authentication to the remote server.
@item password
Optional password for authentication to the remote server.
@item host
Address of the remote server.
@item path
Path on the remote server, including any query string.
@end table
The following options are also supported:
@table @option
@item url
The full URL when passing options to the driver explicitly.
@item readahead
The amount of data to read ahead with each range request to the remote server.
This value may optionally have the suffix 'T', 'G', 'M', 'K', 'k' or 'b'. If it
does not have a suffix, it will be assumed to be in bytes. The value must be a
multiple of 512 bytes. It defaults to 256k.
@item sslverify
Whether to verify the remote server's certificate when connecting over SSL. It
can have the value 'on' or 'off'. It defaults to 'on'.
@end table
Note that when passing options to qemu explicitly, @option{driver} is the value
of <protocol>.
Example: boot from a remote Fedora 20 live ISO image
@example
qemu-system-x86_64 --drive media=cdrom,file=http://dl.fedoraproject.org/pub/fedora/linux/releases/20/Live/x86_64/Fedora-Live-Desktop-x86_64-20-1.iso,readonly
qemu-system-x86_64 --drive media=cdrom,file.driver=http,file.url=http://dl.fedoraproject.org/pub/fedora/linux/releases/20/Live/x86_64/Fedora-Live-Desktop-x86_64-20-1.iso,readonly
@end example
Example: boot from a remote Fedora 20 cloud image using a local overlay for
writes, copy-on-read, and a readahead of 64k
@example
qemu-img create -f qcow2 -o backing_file='json:@{"file.driver":"http",, "file.url":"https://dl.fedoraproject.org/pub/fedora/linux/releases/20/Images/x86_64/Fedora-x86_64-20-20131211.1-sda.qcow2",, "file.readahead":"64k"@}' /tmp/Fedora-x86_64-20-20131211.1-sda.qcow2
qemu-system-x86_64 -drive file=/tmp/Fedora-x86_64-20-20131211.1-sda.qcow2,copy-on-read=on
@end example
Example: boot from an image stored on a VMware vSphere server with a self-signed
certificate using a local overlay for writes and a readahead of 64k
@example
qemu-img create -f qcow2 -o backing_file='json:@{"file.driver":"https",, "file.url":"https://user:password@@vsphere.example.com/folder/test/test-flat.vmdk?dcPath=Datacenter&dsName=datastore1",, "file.sslverify":"off",, "file.readahead":"64k"@}' /tmp/test.qcow2
qemu-system-x86_64 -drive file=/tmp/test.qcow2
@end example
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