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| -rwxr-xr-x | morphlib/exts/initramfs.write | 27 | ||||
| -rw-r--r-- | morphlib/exts/initramfs.write.help | 35 |
2 files changed, 62 insertions, 0 deletions
diff --git a/morphlib/exts/initramfs.write b/morphlib/exts/initramfs.write new file mode 100755 index 00000000..815772f2 --- /dev/null +++ b/morphlib/exts/initramfs.write @@ -0,0 +1,27 @@ +#!/bin/sh +# Copyright (C) 2014 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, write to the Free Software Foundation, Inc., +# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +# +# =*= License: GPL-2 =*= + +set -e + +ROOTDIR="$1" +INITRAMFS_PATH="$2" + +(cd "$ROOTDIR" && + find . -print0 | + cpio -0 -H newc -o | + gzip -c) >"$INITRAMFS_PATH" diff --git a/morphlib/exts/initramfs.write.help b/morphlib/exts/initramfs.write.help new file mode 100644 index 00000000..29a9d266 --- /dev/null +++ b/morphlib/exts/initramfs.write.help @@ -0,0 +1,35 @@ +help: | + Create an initramfs for a system by taking an existing system and + converting it to the appropriate format. + + The system must have a `/init` executable as the userland entry-point. + This can have a different path, if `rdinit=$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 |