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by Casey Marshall
Source distribution of launchpad.net/juju-core created 20140327105939 |
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// Copyright 2013 Canonical Ltd. This software is licensed under the
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// GNU Lesser General Public License version 3 (see the file COPYING).
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package gwacl |
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// This is a pre-defined, base64-encoded 512-byte footer for a Virtual Hard
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// Disk (VHD) file. The footer sets the size of the VHD to a fixed 20Mb
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// (20972032 bytes) and is intended to be uploaded as the last page in a blob
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// of that size.
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//
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// The end use of this is to have a quick way of defining a fixed-size VHD
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// that can be attached to a VM instance. The rest of the file can be
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// sparse-filled as necessary with a filesystem to create a final, valid,
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// mountable disk.
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//
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// In case you were wondering *why* you would want to do this, it's the only
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// way of making additional data available to a new instance at boot time.
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//
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// If you want to generate a new one of these (if you need a new size for
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// example), the easiest way is to use VirtualBox to define a new one, and
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// then do 'tail -c 512 | base64' on that file.
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const VHD_SIZE = 20972032 // This is 20Mib + 512 bytes |
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const VHD_FOOTER = ` |
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Y29uZWN0aXgAAAACAAEAAP//////////GVKuuHZib3gABAACV2kyawAAAAABQAAAAAAAAAFAAAAC
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WgQRAAAAAv//5y4OEjVapHY7QpuodZNf77j6AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=`
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