modules.d/99squash/module-setup.sh

   1 #!/bin/bash
   2
   3 check() {
   4     require_binaries mksquashfs unsquashfs || return 1
   5
   6     for i in CONFIG_SQUASHFS CONFIG_BLK_DEV_LOOP CONFIG_OVERLAY_FS ; do
   7         if ! check_kernel_config $i; then
   8             dinfo "dracut-squash module requires kernel configuration $i (y or m)"
   9             return 1
  10         fi
  11     done
  12
  13     return 255
  14 }
  15
  16 depends() {
  17     echo "systemd-initrd"
  18     return 0
  19 }
  20
  21 installkernel() {
  22     hostonly="" instmods squashfs loop overlay
  23 }
  24
  25 installpost() {
  26     local squash_candidate=( "usr" "etc" )
  27
  28     # shellcheck disable=SC2174
  29     mkdir -m 0755 -p "$squash_dir"
  30     for folder in "${squash_candidate[@]}"; do
  31         mv "$initdir/$folder" "$squash_dir/$folder"
  32     done
  33
  34     # Move some files out side of the squash image, including:
  35     # - Files required to boot and mount the squashfs image
  36     # - Files need to be accessible without mounting the squash image
  37     # - Initramfs marker
  38     for file in \
  39         "$squash_dir"/usr/lib/modules/*/modules.* \
  40         "$squash_dir"/usr/lib/dracut/* \
  41         "$squash_dir"/etc/initrd-release
  42     do
  43         [[ -f $file ]] || continue
  44         DRACUT_RESOLVE_DEPS=1 dracutsysrootdir="$squash_dir" inst "${file#$squash_dir}"
  45         rm "$file"
  46     done
  47
  48     # Install required files for the squash image setup script.
  49     hostonly="" instmods "loop" "squashfs" "overlay"
  50     inst_multiple modprobe mount mkdir ln echo
  51
  52     mv "$initdir"/init "$initdir"/init.orig
  53     inst "$moddir"/init-squash.sh /init
  54     inst "$moddir"/clear-squash.sh /squash/clear-squash.sh
  55
  56     # Keep systemctl outsite if we need switch root
  57     if [[ ! -f "$initdir/lib/dracut/no-switch-root" ]]; then
  58       inst "systemctl"
  59     fi
  60
  61     # Remove duplicated files
  62     for folder in "${squash_candidate[@]}"; do
  63         find "$initdir/$folder/" -not -type d \
  64             -exec bash -c 'mv -f "$squash_dir${1#$initdir}" "$1"' -- "{}" \;
  65     done
  66 }
  67
  68 install() {
  69     if [[ $DRACUT_SQUASH_POST_INST ]]; then
  70         installpost
  71         return
  72     fi
  73
  74     inst "$moddir/squash-mnt-clear.service" "$systemdsystemunitdir/squash-mnt-clear.service"
  75     $SYSTEMCTL -q --root "$initdir" add-wants initrd-switch-root.target squash-mnt-clear.service
  76 }