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From f462176a19f463861fea7a26af6288403785eb9b Mon Sep 17 00:00:00 2001
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From: Kairui Song <kasong@redhat.com>
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Date: Mon, 15 Feb 2021 14:04:05 +0800
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Subject: [PATCH] feat(squash): use busybox for early setup if available
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Use busybox can help reduce the size of early setup environment.
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With this change, everything is packed in the squash image, and
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the setup files will be dropped once squash image setup is done,
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so initramfs stage memory usage is reduced to the minimun,
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and initramfs decompress is also faster.
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File layout of a squash initramfs looks like this:
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========================================================================
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drwxr-xr-x 1 root root 0 Feb 15 14:07 .
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-rwxr-xr-x 1 root root 946 Feb 15 14:07 init
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lrwxrwxrwx 1 root root 7 Feb 15 14:07 lib -> usr/lib
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drwxr-xr-x 1 root root 0 Feb 15 14:07 squash
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-rw-r--r-- 1 root root 91000832 Feb 15 14:07 squash-root.img
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drwxr-xr-x 1 root root 0 Feb 15 14:07 usr
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drwxr-xr-x 1 root root 0 Feb 15 14:07 usr/bin
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-rwxr-xr-x 1 root root 1293688 Jul 27 2020 usr/bin/busybox
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lrwxrwxrwx 1 root root 7 Feb 15 14:07 usr/bin/echo -> busybox
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lrwxrwxrwx 1 root root 7 Feb 15 14:07 usr/bin/mkdir -> busybox
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lrwxrwxrwx 1 root root 7 Feb 15 14:07 usr/bin/modprobe -> busybox
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lrwxrwxrwx 1 root root 7 Feb 15 14:07 usr/bin/mount -> busybox
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lrwxrwxrwx 1 root root 7 Feb 15 14:07 usr/bin/sh -> busybox
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lrwxrwxrwx 1 root root 7 Feb 15 14:07 usr/bin/switch_root -> busybox
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drwxr-xr-x 1 root root 0 Feb 15 14:07 usr/lib
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drwxr-xr-x 1 root root 0 Feb 15 14:07 usr/lib/dracut
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-rw-r--r-- 1 root root 23 Feb 15 14:07 usr/lib/dracut/build-parameter.txt
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-rw-r--r-- 1 root root 31 Feb 15 14:07 usr/lib/dracut/dracut-051-93.git20210215.fc33
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-rw-r--r-- 1 root root 358 Feb 15 14:07 usr/lib/dracut/modules.txt
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-rw-r--r-- 1 root root 0 Feb 15 14:07 usr/lib/dracut/need-initqueue
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drwxr-xr-x 1 root root 0 Feb 15 14:07 usr/lib/modules
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drwxr-xr-x 1 root root 0 Feb 15 14:07 usr/lib/modules/5.10.11-200.fc33.x86_64
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drwxr-xr-x 1 root root 0 Feb 15 14:07 usr/lib/modules/5.10.11-200.fc33.x86_64/kernel
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<... kernel module misc files skipped ... >
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========================================================================
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(cherry picked from commit 90f269f6afe409925bad86f0bd7e9322ad9b4fb0)
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Resolves: #1959336
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---
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modules.d/99squash/module-setup.sh | 13 ++++++++++++-
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1 file changed, 12 insertions(+), 1 deletion(-)
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diff --git a/modules.d/99squash/module-setup.sh b/modules.d/99squash/module-setup.sh
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index 50c92c31..72cc83ad 100644
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--- a/modules.d/99squash/module-setup.sh
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+++ b/modules.d/99squash/module-setup.sh
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@@ -19,6 +19,9 @@ depends() {
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}
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installpost() {
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+ local _busybox
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+ _busybox=$(find_binary busybox)
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+
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# Move everything under $initdir except $squash_dir
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# itself into squash image
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for i in "$initdir"/*; do
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@@ -37,7 +40,15 @@ installpost() {
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done
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# Install required modules and binaries for the squash image init script.
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- DRACUT_RESOLVE_DEPS=1 inst_multiple sh mount modprobe mkdir switch_root
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+ if [[ $_busybox ]]; then
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+ inst "$_busybox" /usr/bin/busybox
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+ for _i in sh echo mount modprobe mkdir switch_root; do
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+ ln_r /usr/bin/busybox /usr/bin/$_i
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+ done
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+ else
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+ DRACUT_RESOLVE_DEPS=1 inst_multiple sh mount modprobe mkdir switch_root
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+ fi
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+
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hostonly="" instmods "loop" "squashfs" "overlay"
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dracut_kernel_post
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