Re: [PATCH v3 1/3] meta/support: Generate a custom initramfs

[Gylstorff Quirin <quirin.gylstorff@siemens.com>]

On 4/20/20 10:14 PM, Henning Schild wrote:
> Am Tue, 14 Apr 2020 14:24:47 +0200
> schrieb "[ext] Q. Gylstorff" <Quirin.Gylstorff@siemens.com>:
> 
>> From: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>>
>> This package sets the Parameters for mkinitramfs/update-intramfs
>> before it regenerates the initrd.img of debian with a modified
>> version.
>>
>> Use cases are the remove unnecessary kernel modules to reduce the
>> size of the initrd by using the parameters:
>> ```
>> INITRAMFS_MODULES = "list"
>> INITRAMFS_MODULE_LIST += "ext4"
>> ```
>>
>> Set the boot root during the initrd generation by setting
>> `INITRAMFS_ROOT`.
>>
>> see also man pages of mkinitramfs and initramfs.conf.
>>
>> Signed-off-by: Quirin Gylstorff <quirin.gylstorff@siemens.com>
>> ---
>>   .../initramfs-config/files/control.tmpl       | 12 +++++++
>>   .../initramfs-config/files/postinst.tmpl      | 27 ++++++++++++++++
>>   .../initramfs-config/files/postrm.tmpl        | 19 +++++++++++
>>   .../initramfs-config/initramfs-config_0.1.bb  | 32
>> +++++++++++++++++++ 4 files changed, 90 insertions(+)
>>   create mode 100644
>> meta/recipes-support/initramfs-config/files/control.tmpl create mode
>> 100644 meta/recipes-support/initramfs-config/files/postinst.tmpl
>> create mode 100644
>> meta/recipes-support/initramfs-config/files/postrm.tmpl create mode
>> 100644 meta/recipes-support/initramfs-config/initramfs-config_0.1.bb
>>
>> diff --git a/meta/recipes-support/initramfs-config/files/control.tmpl
>> b/meta/recipes-support/initramfs-config/files/control.tmpl new file
>> mode 100644 index 0000000..8739b4a
>> --- /dev/null
>> +++ b/meta/recipes-support/initramfs-config/files/control.tmpl
>> @@ -0,0 +1,12 @@
>> +Source: initramfs-config
>> +Section: misc
>> +Priority: optional
>> +Standards-Version: 3.9.6
>> +Maintainer: isar-users <isar-users@googlegroups.com>
>> +Build-Depends: debhelper (>= 9)
>> +
>> +
>> +Package: initramfs-config
>> +Architecture: any
>> +Depends: ${shlibs:Depends}, ${misc:Depends}, initramfs-tools-core,
>> ${DEBIAN_DEPENDS} +Description: Configuration files for a custom
>> initramfs \ No newline at end of file
>> diff --git
>> a/meta/recipes-support/initramfs-config/files/postinst.tmpl
>> b/meta/recipes-support/initramfs-config/files/postinst.tmpl new file
>> mode 100644 index 0000000..ca8c9c6 --- /dev/null
>> +++ b/meta/recipes-support/initramfs-config/files/postinst.tmpl
>> @@ -0,0 +1,27 @@
>> +#!/bin/bash
> 
> can this be /bin/sh, and if not does that add a dep?

Yes it can.
Quirin
> 
> Henning
> 
>> +INITRAMFS_CONF=/etc/initramfs-tools/initramfs.conf
>> +if [ -f ${INITRAMFS_CONF} ]; then
>> +    sed -i -E 's/(^MODULES=).*/\1${INITRAMFS_MODULES}/'
>> ${INITRAMFS_CONF}
>> +    sed -i -E 's/(^BUSYBOX=).*/\1${INITRAMFS_BUSYBOX}/'
>> ${INITRAMFS_CONF}
>> +    sed -i -E 's/(^COMPRESS=).*/\1${INITRAMFS_COMPRESS}/'
>> ${INITRAMFS_CONF}
>> +    sed -i -E 's/(^KEYMAP=).*/\1${INITRAMFS_KEYMAP}/'
>> ${INITRAMFS_CONF}
>> +    sed -i -E 's/(^DEVICE=).*/\1${INITRAMFS_NET_DEVICE}/'
>> ${INITRAMFS_CONF}
>> +    sed -i -E 's/(^NFSROOT=).*/\1${INITRAMFS_NFSROOT}/'
>> ${INITRAMFS_CONF}
>> +    sed -i -E 's/(^RUNSIZE=).*/\1${INITRAMFS_RUNSIZE}/'
>> ${INITRAMFS_CONF}
>> +    if grep -Fxq "ROOT=" "${INITRAMFS_CONF}"; then
>> +        sed -i -E 's/(^ROOT=).*/\1${INITRAMFS_ROOT}/'
>> ${INITRAMFS_CONF}
>> +    else
>> +        sed -i -E "\$aROOT=${INITRAMFS_ROOT}" ${INITRAMFS_CONF}
>> +    fi
>> +fi
>> +
>> +MODULES_LIST_FILE=/etc/initramfs-tools/modules
>> +if [ -f ${MODULES_LIST_FILE} ]; then
>> +    for modname in ${INITRAMFS_MODULE_LIST}; do
>> +        if ! grep -Fxq "$modname" "${MODULES_LIST_FILE}"; then
>> +            echo "$modname" >> "${MODULES_LIST_FILE}"
>> +        fi
>> +    done
>> +fi
>> +
>> +update-initramfs -v -u
>> diff --git a/meta/recipes-support/initramfs-config/files/postrm.tmpl
>> b/meta/recipes-support/initramfs-config/files/postrm.tmpl new file
>> mode 100644 index 0000000..55399d5
>> --- /dev/null
>> +++ b/meta/recipes-support/initramfs-config/files/postrm.tmpl
>> @@ -0,0 +1,19 @@
>> +#!/bin/bash
>> +# back to the debian defaults
>> +INITRAMFS_CONF=/etc/initramfs-tools/initramfs.conf
>> +sed -i -E 's/(^MODULES=).*/\1most/' ${INITRAMFS_CONF}
>> +sed -i -E 's/(^BUSYBOX=).*/\1auto/' ${INITRAMFS_CONF}
>> +sed -i -E 's/(^COMPRESS=).*/\1gzip/' ${INITRAMFS_CONF}
>> +sed -i -E 's/(^KEYMAP=).*/\1n/' ${INITRAMFS_CONF}
>> +sed -i -E 's/(^DEVICE=).*/\1/' ${INITRAMFS_CONF}
>> +sed -i -E 's/(^NFSROOT=).*/\1auto/' ${INITRAMFS_CONF}
>> +sed -i -E 's/(^RUNSIZE=).*/\110%/' ${INITRAMFS_CONF}
>> +sed -i -E 's/(^ROOT=).*//' ${INITRAMFS_CONF}
>> +
>> +# remove the added modules
>> +MODULES_LIST_FILE=/etc/initramfs-tools/modules
>> +for modname in ${INITRAMFS_MODULE_LIST}; do
>> +    sed -i -E 's/$modname//'
>> +done
>> +
>> +update-initramfs -v -u
>> diff --git
>> a/meta/recipes-support/initramfs-config/initramfs-config_0.1.bb
>> b/meta/recipes-support/initramfs-config/initramfs-config_0.1.bb new
>> file mode 100644 index 0000000..34bb25b --- /dev/null
>> +++ b/meta/recipes-support/initramfs-config/initramfs-config_0.1.bb
>> @@ -0,0 +1,32 @@
>> +# This software is a part of ISAR.
>> +# Copyright (C) 2020 Siemens AG
>> +#
>> +# SPDX-License-Identifier: MIT
>> +inherit dpkg-raw
>> +inherit template
>> +DESCRIPTION = "Recipe to set the initramfs configuration and
>> generate a new ramfs" +
>> +
>> +SRC_URI = "file://postinst.tmpl \
>> +           file://postrm.tmpl \
>> +           file://control.tmpl \
>> +          "
>> +
>> +INITRAMFS_MODULES ?= "most"
>> +INITRAMFS_BUSYBOX ?= "auto"
>> +INITRAMFS_COMPRESS ?= "gzip"
>> +INITRAMFS_KEYMAP ?= "n"
>> +INITRAMFS_NET_DEVICE ?= ""
>> +INITRAMFS_NFSROOT ?= "auto"
>> +INITRAMFS_RUNSIZE ?= "10%"
>> +INITRAMFS_ROOT ?= ""
>> +INITRAMFS_MODULE_LIST ?= ""
>> +CREATE_NEW_INITRAMFS ?= "n"
>> +KERNEL_PACKAGE = "${@ ("linux-image-" + d.getVar("KERNEL_NAME",
>> True)) if d.getVar("KERNEL_NAME", True) else ""}" +DEBIAN_DEPENDS +=
>> ", ${KERNEL_PACKAGE}" +TEMPLATE_FILES = "postinst.tmpl control.tmpl
>> postrm.tmpl" +TEMPLATE_VARS += "INITRAMFS_MODULES INITRAMFS_BUSYBOX
>> INITRAMFS_COMPRESS \
>> +                  INITRAMFS_KEYMAP INITRAMFS_NET_DEVICE
>> INITRAMFS_NFSROOT \
>> +                  INITRAMFS_RUNSIZE INITRAMFS_ROOT
>> INITRAMFS_MODULE_LIST CREATE_NEW_INITRAMFS DEBIAN_DEPENDS" +
>> +
> 

-- 
Quirin Gylstorff

Siemens AG
Corporate Technology
Research in Digitalization and Automation
Smart Embedded Systems
CT RDA IOT SES-DE
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81739 Muenchen, Germany
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mailto:quirin.gylstorff@siemens.com
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