dinfo "*** Creating image file '$outfile' ***"
+if dracut_module_included "squash"; then
+ if ! check_kernel_config CONFIG_SQUASHFS; then
+ dfatal "CONFIG_SQUASHFS have to be enabled for dracut squash module to work"
+ exit 1
+ fi
+ if ! check_kernel_config CONFIG_OVERLAY_FS; then
+ dfatal "CONFIG_OVERLAY_FS have to be enabled for dracut squash module to work"
+ exit 1
+ fi
+ if ! check_kernel_config CONFIG_DEVTMPFS; then
+ dfatal "CONFIG_DEVTMPFS have to be enabled for dracut squash module to work"
+ exit 1
+ fi
+
+ readonly squash_dir="${DRACUT_TMPDIR}/squashfs"
+ readonly squash_img=$initdir/squash/root.img
+
+ # Currently only move "usr" "etc" to squashdir
+ readonly squash_candidate=( "usr" "etc" )
+
+ mkdir -m 0755 -p $squash_dir
+ for folder in "${squash_candidate[@]}"; do
+ mv $initdir/$folder $squash_dir/$folder
+ done
+
+ # Reinstall required files, because we have moved some important folders to $squash_dir
+ inst_multiple "echo" "sh" "mount" "modprobe" "mkdir" \
+ "systemctl" "udevadm" "$systemdutildir/systemd"
+ hostonly="" instmods "loop" "squashfs" "overlay"
+
+ for folder in "${squash_candidate[@]}"; do
+ # Remove duplicated files in squashfs image, save some more space
+ [[ ! -d $initdir/$folder/ ]] && continue
+ for file in $(find $initdir/$folder/ -not -type d);
+ do
+ if [[ -e $squash_dir${file#$initdir} ]]; then
+ mv $squash_dir${file#$initdir} $file
+ fi
+ done
+ done
+
+ # Move some files out side of the squash image, including:
+ # - Files required to boot and mount the squashfs image
+ # - Files need to be accessable without mounting the squash image
+ required_in_root() {
+ local file=$1
+ local _sqsh_file=$squash_dir/$file
+ local _init_file=$initdir/$file
+
+ if [[ -e $_init_file ]]; then
+ return
+ fi
+
+ if [[ ! -e $_sqsh_file ]] && [[ ! -L $_sqsh_file ]]; then
+ derror "$file is required to boot a squashed initramfs but it's not installed!"
+ return
+ fi
+
+ if [[ ! -d $(dirname $_init_file) ]]; then
+ required_in_root $(dirname $file)
+ fi
+
+ if [[ -d $_sqsh_file ]]; then
+ if [[ -L $_sqsh_file ]]; then
+ cp --preserve=all -P $_sqsh_file $_init_file
+ else
+ mkdir $_init_file
+ fi
+ else
+ if [[ -L $_sqsh_file ]]; then
+ cp --preserve=all -P $_sqsh_file $_init_file
+ _sqsh_file=$(realpath $_sqsh_file 2>/dev/null)
+ if [[ -e $_sqsh_file ]] && [[ "$_sqsh_file" == "$squash_dir"* ]]; then
+ # Relative symlink
+ required_in_root ${_sqsh_file#$squash_dir/}
+ return
+ fi
+ if [[ -e $squash_dir$_sqsh_file ]]; then
+ # Absolute symlink
+ required_in_root ${_sqsh_file#/}
+ return
+ fi
+ required_in_root ${module_spec#$squash_dir/}
+ else
+ mv $_sqsh_file $_init_file
+ fi
+ fi
+ }
+
+ required_in_root etc/initrd-release
+
+ for module_spec in $squash_dir/usr/lib/modules/*/modules.*;
+ do
+ required_in_root ${module_spec#$squash_dir/}
+ done
+
+ for dracut_spec in $squash_dir/usr/lib/dracut/*;
+ do
+ required_in_root ${dracut_spec#$squash_dir/}
+ done
+
+ mv $initdir/init $initdir/init.stock
+ mv $initdir/shutdown $initdir/shutdown.stock
+ ln -s squash/init.sh $initdir/init
+ ln -s squash/shutdown.sh $initdir/shutdown
+
+ mksquashfs $squash_dir $squash_img -comp xz -b 64K -Xdict-size 100% &> /dev/null
+
+ if [[ $? != 0 ]]; then
+ dfatal "dracut: Failed making squash image"
+ exit 1
+ fi
+fi
+
if [[ $uefi = yes ]]; then
readonly uefi_outdir="$DRACUT_TMPDIR/uefi"
mkdir "$uefi_outdir"
--- /dev/null
+#!/bin/sh
+PATH=/bin:/sbin
+
+SQUASH_IMG=/squash/root.img
+SQUASH_MNT=/squash/root
+SQUASH_MNT_REC=/squash/mounts
+SQUASHED_MNT="usr etc"
+
+echo $SQUASH_MNT > $SQUASH_MNT_REC
+
+# 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
+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 $SQUASHED_MNT; do
+ lowerdir=$SQUASH_MNT/$file
+ workdir=/squash/overlay-work/$file
+ upperdir=/$file
+ mntdir=/$file
+
+ mkdir -m 0755 -p $workdir
+ mkdir -m 0755 -p $mntdir
+
+ mount -t overlay overlay -o\
+ lowerdir=$lowerdir,upperdir=$upperdir,workdir=$workdir $mntdir
+
+ echo $mntdir >> $SQUASH_MNT_REC
+done
projects / thirdparty / dracut.git / commitdiff
