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# Copyright (C) 2014, 2015 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, see <http://www.gnu.org/licenses/>.
help: |
Create an initramfs for a system by taking an existing system and
converting it to the appropriate format.
The system must have a `/init` executable as the userland entry-point.
This can have a different path, if `rdinit=$path` is added to
the kernel command line. This can be added to the `rawdisk`,
`virtualbox-ssh` and `kvm` write extensions with the `KERNEL_CMDLINE`
option.
It is possible to use a ramfs as the final rootfs without a `/init`
executable, by setting `root=/dev/mem`, or `rdinit=/sbin/init`,
but this is beyond the scope for the `initramfs.write` extension.
The intended use of initramfs.write is to be part of a nested
deployment, so the parent system has an initramfs stored as
`/boot/initramfs.gz`. See the following example:
name: initramfs-test
kind: cluster
systems:
- morph: minimal-system-x86_64-generic
deploy:
system:
type: rawdisk
location: initramfs-system-x86_64.img
DISK_SIZE: 1G
HOSTNAME: initramfs-system
INITRAMFS_PATH: boot/initramfs.gz
subsystems:
- morph: initramfs-x86_64
deploy:
initramfs:
type: initramfs
location: boot/initramfs.gz
Parameters:
* location: the path where the initramfs will be installed (e.g.
`boot/initramfs.gz`) in the above example
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