Re: [PATCH] recipes-initramfs/compress-initrd: add recipe to compress initrd with xz

[Srinuvasan Arjunan <srinuvasanasv@gmail.com>]

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On Mon, May 13, 2024 at 10:57 AM 'Jan Kiszka' via isar-users <
isar-users@googlegroups.com> wrote:

> On 13.05.24 07:26, srinuvasan.a@siemens.com wrote:
> > From: srinuvasan <srinuvasan.a@siemens.com>
> >
> > By default initrd compressed with zstd tool, with the present bullseye
> base image
> > of amd64 the initrd size is almost 27MB, this can be reduced with the
> help of xz tool,
> > using this one the generated initrd size is almost 18MB, we saved almost
> 9MB.
> >
>
> Isn't that just a matter of increasing the compression rate of zstd? It
> seems xz is getting out of fashion generally, and it comes with higher
> decompression load.
>
> Jan
>

  Sorry, its not zstd tool, the default one is gzip (wrongly captured in
commit message), Just i pushed this patch for very limited memory
requirement embedded devices, in this case i considered the memory
requirement not a decompression load.

Thanks,
Srinu

>
> > Signed-off-by: srinuvasan <srinuvasan.a@siemens.com>
> > ---
> >  meta-isar/conf/local.conf.sample               |  2 +-
> >  .../compress-initrd/compress-initrd.bb         | 18 ++++++++++++++++++
> >  .../compress-initrd/files/postinst             |  5 +++++
> >  3 files changed, 24 insertions(+), 1 deletion(-)
> >  create mode 100644 meta-isar/recipes-initramfs/compress-initrd/
> compress-initrd.bb
> >  create mode 100644
> meta-isar/recipes-initramfs/compress-initrd/files/postinst
> >
> > diff --git a/meta-isar/conf/local.conf.sample
> b/meta-isar/conf/local.conf.sample
> > index 17455015..ac8b749e 100644
> > --- a/meta-isar/conf/local.conf.sample
> > +++ b/meta-isar/conf/local.conf.sample
> > @@ -149,7 +149,7 @@ CONF_VERSION = "1"
> >
> >  #
> >  # The default list of extra packages to be installed.
> > -IMAGE_INSTALL = "hello-isar example-raw example-module-${KERNEL_NAME}
> enable-fsck isar-exclude-docs samefile hello isar-disable-apt-cache cowsay
> example-prebuilt"
> > +IMAGE_INSTALL = "hello-isar example-raw example-module-${KERNEL_NAME}
> enable-fsck isar-exclude-docs samefile hello isar-disable-apt-cache cowsay
> example-prebuilt compress-initrd"
> >
> >  #
> >  # Machines with secure boot should use signed modules.
> > diff --git a/meta-isar/recipes-initramfs/compress-initrd/
> compress-initrd.bb b/meta-isar/recipes-initramfs/compress-initrd/
> compress-initrd.bb
> > new file mode 100644
> > index 00000000..21e28782
> > --- /dev/null
> > +++ b/meta-isar/recipes-initramfs/compress-initrd/compress-initrd.bb
> > @@ -0,0 +1,18 @@
> > +# Compress the initrd with better compression tool
> > +#
> > +# This software is a part of ISAR.
> > +
> > +DESCRIPTION = "Compress the initrd with better compression tool"
> > +MAINTAINER = "Your name here <you@domain.com>"
> > +
> > +inherit dpkg-raw
> > +
> > +DEBIAN_DEPENDS = "linux-image-${KERNEL_NAME}, xz-utils, initramfs-tools"
> > +
> > +SRC_URI = " \
> > +    file://postinst \
> > +"
> > +do_install() {
> > +    install -v -d "${D}/etc/initramfs-tools/conf.d/"
> > +    echo "COMPRESS=xz" > "${D}/etc/initramfs-tools/conf.d/${PN}.conf"
> > +}
> > diff --git a/meta-isar/recipes-initramfs/compress-initrd/files/postinst
> b/meta-isar/recipes-initramfs/compress-initrd/files/postinst
> > new file mode 100644
> > index 00000000..0db52142
> > --- /dev/null
> > +++ b/meta-isar/recipes-initramfs/compress-initrd/files/postinst
> > @@ -0,0 +1,5 @@
> > +#!/bin/sh
> > +
> > +set -e
> > +
> > +update-initramfs -c -k all
>
> --
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> Linux Expert Center
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