fi
if [[ -d squash ]]; then
- unsquashfs -no-xattrs -f -d . squash/root.img >/dev/null
+ unsquashfs -no-xattrs -f -d . squash-root.img >/dev/null
if [ $? -ne 0 ]; then
- echo "Squash module is enabled for this initramfs but failed to unpack squash/root.img" >&2
+ echo "Squash module is enabled for this initramfs but failed to unpack squash-root.img" >&2
rm -f -- /run/initramfs/shutdown
exit 1
fi
if dracut_module_included "squash"; then
readonly squash_dir="$initdir/squash/root"
- readonly squash_img="$initdir/squash/root.img"
-
+ readonly squash_img="$initdir/squash-root.img"
+ mkdir -p "$squash_dir"
dinfo "*** Install squash loader ***"
DRACUT_SQUASH_POST_INST=1 module_install "squash"
fi
list_squash_content()
{
- SQUASH_IMG="squash/root.img"
+ SQUASH_IMG="squash-root.img"
SQUASH_TMPFILE="$TMPDIR/initrd.root.sqsh"
$CAT "$image" 2>/dev/null | cpio --extract --verbose --quiet --to-stdout -- \
+++ /dev/null
-#!/bin/bash
-mnt="/squash/root"
-for dir in jsquash/root/*; do
- mnt="$mnt ${dir#$SQUASH_MNT}"
-done
-umount --lazy -- $mnt
-#!/bin/bash
+#!/bin/sh
PATH=/bin:/sbin
-SQUASH_IMG=/squash/root.img
-SQUASH_MNT=/squash/root
+# Basic mounts for mounting a squash image
+mkdir /proc /sys /dev /run
+mount -t proc -o nosuid,noexec,nodev proc /proc
+mount -t sysfs -o nosuid,noexec,nodev sysfs /sys
+mount -t devtmpfs -o mode=755,noexec,nosuid,strictatime devtmpfs /dev
+mount -t tmpfs -o mode=755,nodev,nosuid,strictatime tmpfs /run
-# Following mount points are neccessary for mounting a squash image
-
-[ ! -d /proc/self ] && \
- mount -t proc -o nosuid,noexec,nodev proc /proc
-
-[ ! -d /sys/kernel ] && \
- mount -t sysfs -o nosuid,noexec,nodev sysfs /sys
-
-[ ! -e /dev/loop-control ] && \
- mount -t devtmpfs -o mode=0755,noexec,nosuid,strictatime devtmpfs /dev
-
-# Need a loop device backend, overlayfs, and squashfs module
+# Load required modules
modprobe loop
-if [ $? != 0 ]; then
- echo "Unable to setup loop module"
-fi
-
modprobe squashfs
-if [ $? != 0 ]; then
- echo "Unable to setup squashfs module"
-fi
-
modprobe overlay
-if [ $? != 0 ]; then
- echo "Unable to setup overlay module"
-fi
-
-[ ! -d "$SQUASH_MNT" ] && \
- mkdir -m 0755 -p $SQUASH_MNT
-
-# Mount the squashfs image
-mount -t squashfs -o ro,loop $SQUASH_IMG $SQUASH_MNT
-
-if [ $? != 0 ]; then
- echo "Unable to mount squashed initramfs image"
-fi
-
-for file in $SQUASH_MNT/*; do
- file=${file#$SQUASH_MNT/}
- lowerdir=$SQUASH_MNT/$file
- workdir=/squash/overlay-work/$file
- upperdir=/$file
- mntdir=/$file
- mkdir -m 0755 -p $workdir
- mkdir -m 0755 -p $mntdir
+# Mount the squash image
+mount -t ramfs ramfs /squash
+mkdir -p /squash/root /squash/overlay/upper /squash/overlay/work
+mount -t squashfs -o ro,loop /squash-root.img /squash/root
- mount -t overlay overlay -o\
- lowerdir=$lowerdir,upperdir=$upperdir,workdir=$workdir $mntdir
-done
+# Setup new root overlay
+mkdir /newroot
+mount -t overlay overlay -o lowerdir=/squash/root,upperdir=/squash/overlay/upper,workdir=/squash/overlay/work/ /newroot/
-exec /init.orig
+# Move all mount points to new root to prepare chroot
+mount --move /squash /newroot/squash
-echo "Something went wrong when trying to exec original init!"
-exit 1
+# Jump to new root and clean setup files
+SYSTEMD_IN_INITRD=lenient exec switch_root /newroot /init
}
installpost() {
- local squash_candidate=( "usr" "etc" )
-
- # shellcheck disable=SC2174
- mkdir -m 0755 -p "$squash_dir"
- for folder in "${squash_candidate[@]}"; do
- mv "$initdir/$folder" "$squash_dir/$folder"
+ # Move everything under $initdir except $squash_dir
+ # itself into squash image
+ for i in "$initdir"/*; do
+ [[ "$squash_dir" == "$i"/* ]] || mv "$i" "$squash_dir"/
done
- # Move some files out side of the squash image, including:
- # - Files required to boot and mount the squashfs image
- # - Files need to be accessible without mounting the squash image
- # - Initramfs marker
- for file in \
- "$squash_dir"/usr/lib/dracut/* \
- "$squash_dir"/etc/initrd-release
- do
+ # Create mount points for squash loader
+ mkdir -p "$initdir"/squash/
+ mkdir -p "$squash_dir"/squash/
+
+ # Copy dracut spec files out side of the squash image
+ # so dracut rebuild and lsinitrd can work
+ for file in "$squash_dir"/usr/lib/dracut/*; do
[[ -f $file ]] || continue
DRACUT_RESOLVE_DEPS=1 dracutsysrootdir="$squash_dir" inst "${file#$squash_dir}"
- rm "$file"
- done
-
- # Install required files for the squash image setup script.
- inst_multiple modprobe mount mkdir ln echo rm
-
- mv "$initdir"/init "$initdir"/init.orig
- inst "$moddir"/init-squash.sh /init
- inst "$moddir"/clear-squash.sh /squash/clear-squash.sh
-
- # Keep systemctl outsite if we need switch root
- if [[ ! -f "$initdir/lib/dracut/no-switch-root" ]]; then
- inst "systemctl"
- fi
-
- # Remove duplicated files
- for folder in "${squash_candidate[@]}"; do
- find "$initdir/$folder/" -not -type d \
- -exec bash -c 'mv -f "$squash_dir${1#$initdir}" "$1"' -- "{}" \;
done
- # Install required modules for the squash image init script.
+ # Install required modules and binaries for the squash image init script.
+ DRACUT_RESOLVE_DEPS=1 inst_multiple sh mount modprobe mkdir switch_root
hostonly="" instmods "loop" "squashfs" "overlay"
dracut_kernel_post
+
+ # Install squash image init script.
+ ln -sfn /usr/bin "$initdir/bin"
+ ln -sfn /usr/sbin "$initdir/sbin"
+ inst_simple "$moddir"/init-squash.sh /init
}
install() {
if [[ $DRACUT_SQUASH_POST_INST ]]; then
installpost
- return
fi
-
- inst "$moddir/squash-mnt-clear.service" "$systemdsystemunitdir/squash-mnt-clear.service"
- $SYSTEMCTL -q --root "$initdir" add-wants initrd-switch-root.target squash-mnt-clear.service
}
+++ /dev/null
-# This file is part of dracut.
-#
-
-[Unit]
-Description=Cleanup squashfs mounts when switch root
-DefaultDependencies=no
-Before=initrd-switch-root.service
-After=initrd-switch-root.target
-ConditionPathExists=/squash/root
-
-[Service]
-Type=oneshot
-RemainAfterExit=no
-StandardInput=null
-StandardOutput=journal+console
-StandardError=journal+console
-ExecStart=/squash/clear-squash.sh
projects / thirdparty / dracut.git / commitdiff
