contrib/initramfs/hooks/zfs

   1 #!/bin/sh
   2 #
   3 # Add ZoL filesystem capabilities to an initrd, usually for a native ZFS root.
   4 #
   5
   6 # This hook installs udev rules for ZoL.
   7 PREREQ="zdev"
   8
   9 # These prerequisites are provided by the zfsutils package. The zdb utility is
  10 # not strictly required, but it can be useful at the initramfs recovery prompt.
  11 COPY_EXEC_LIST="/sbin/zdb /sbin/zpool /sbin/zfs /sbin/mount.zfs"
  12 COPY_EXEC_LIST="$COPY_EXEC_LIST /usr/bin/dirname /lib/udev/vdev_id"
  13 COPY_FILE_LIST="/etc/hostid /etc/zfs/zpool.cache /etc/default/zfs"
  14 COPY_FILE_LIST="$COPY_FILE_LIST /etc/zfs/zfs-functions /etc/zfs/vdev_id.conf"
  15 COPY_FILE_LIST="$COPY_FILE_LIST /lib/udev/rules.d/69-vdev.rules"
  16
  17 # These prerequisites are provided by the base system.
  18 COPY_EXEC_LIST="$COPY_EXEC_LIST /bin/hostname /sbin/blkid"
  19
  20 # Explicitly specify all kernel modules because automatic dependency resolution
  21 # is unreliable on many systems.
  22 BASE_MODULES="zlib_deflate spl zavl zcommon znvpair zunicode zfs icp"
  23 CRPT_MODULES="sun-ccm sun-gcm sun-ctr"
  24 MANUAL_ADD_MODULES_LIST="$BASE_MODULES"
  25
  26 # Generic result code.
  27 RC=0
  28
  29 case $1 in
  30 prereqs)
  31         echo "$PREREQ"
  32         exit 0
  33         ;;
  34 esac
  35
  36 for ii in $COPY_EXEC_LIST
  37 do
  38         if [ ! -x "$ii" ]
  39         then
  40                 echo "Error: $ii is not executable."
  41                 RC=2
  42         fi
  43 done
  44
  45 if [ "$RC" -ne 0 ]
  46 then
  47         exit "$RC"
  48 fi
  49
  50 . /usr/share/initramfs-tools/hook-functions
  51
  52 mkdir -p "$DESTDIR/etc/"
  53
  54 # ZDB uses pthreads for some functions, but the library dependency is not
  55 # automatically detected. The `find` utility and extended `cp` options are
  56 # used here because libgcc_s.so could be in a subdirectory of /lib for
  57 # multi-arch installations.
  58 cp --target-directory="$DESTDIR" --parents $(find /lib/ -type f -name libgcc_s.so.1)
  59
  60 for ii in $COPY_EXEC_LIST
  61 do
  62         copy_exec "$ii"
  63 done
  64
  65 for ii in $COPY_FILE_LIST
  66 do
  67         dir=$(dirname "$ii")
  68         [ -d "$dir" ] && mkdir -p "$DESTDIR/$dir"
  69         [ -f "$ii" ] && cp -p "$ii" "$DESTDIR/$ii"
  70 done
  71
  72 for ii in $MANUAL_ADD_MODULES_LIST
  73 do
  74         manual_add_modules "$ii"
  75 done
  76
  77 if [ -f "/etc/hostname" ]
  78 then
  79         cp -p "/etc/hostname" "$DESTDIR/etc/"
  80 else
  81         hostname >"$DESTDIR/etc/hostname"
  82 fi
  83
  84 for ii in zfs zfs.conf spl spl.conf
  85 do
  86         if [ -f "/etc/modprobe.d/$ii" ]; then
  87                 if [ ! -d "$DESTDIR/etc/modprobe.d" ]; then
  88                         mkdir -p $DESTDIR/etc/modprobe.d
  89                 fi
  90                 cp -p "/etc/modprobe.d/$ii" $DESTDIR/etc/modprobe.d/
  91         fi
  92 done
  93
  94 # With pull request #1476 (not yet merged) comes a verbose warning
  95 # if /usr/bin/net doesn't exist or isn't executable. Just create
  96 # a dummy...
  97 [ ! -d "$DESTDIR/usr/bin" ] && mkdir -p "$DESTDIR/usr/bin"
  98 if [ ! -x "$DESTDIR/usr/bin/net" ]; then
  99     touch "$DESTDIR/usr/bin/net"
 100     chmod +x "$DESTDIR/usr/bin/net"
 101 fi
 102
 103 exit 0