slackware-current/source/a/mkinitrd/setup.01.mkinitrd

#!/bin/sh
#BLURB="Generate an initrd for the kernel"

# Load defaults:
if [ -r etc/default/geninitrd ]; then
  . etc/default/geninitrd
fi

# This was the old name for $KERNEL, so allow it still:
KERNEL=$KERNEL_SYMLINK

if [ -z "$KERNEL" ]; then
  # If we weren't told anything else, then use the newest kernel:
  KERNEL="$(find /boot -name "vmlinuz-*" -type f | xargs ls -t | head -n 1)"
fi

# In case this is a symlink, get the real file:
KERNEL="$(readlink -f $KERNEL)"

# Find the kernel version:
if [ -r $KERNEL ]; then
  if file $KERNEL | grep -wq "Linux kernel" ; then
    KERNEL_VERSION=$(strings $KERNEL | grep '([^ ]*@[^ ]*) #' | cut -f1 -d' ')
  else
    echo "error: $KERNEL is not a Linux kernel."
  fi 
else
  echo "error: was not given a KERNEL to make an initrd."
  exit 1
fi

# Sometimes mkinitrd_command_generator.sh does not detect LVM properly. Until I
# get to the bottom of that, it's safer to just always include LVM support.
LVM_OPTION="-L"

# Generate the initrd:
if [ -z "$GENINITRD_SILENT" ]; then
  dialog --title "GENERATING INITIAL RAMDISK" --infobox \
  "Generating an initial ramdisk for use with the $KERNEL_VERSION kernel. \
The initial ramdisk contains kernel modules needed to mount the \
root partition, and must be regenerated whenever the kernel is updated. To \
regenerate the initrd, select this setup script from within pkgtool, or run \
'geninitrd' which will produce an initial ramdisk (/boot/initrd.gz) for the \
installed kernel." 8 70
fi
chroot . /usr/share/mkinitrd/mkinitrd_command_generator.sh -k $KERNEL_VERSION -a "$LVM_OPTION -o /boot/initrd-${KERNEL_VERSION}.img" | chroot . bash 1> /dev/null 2> /dev/null

if [ "$GENINITRD_NAMED_SYMLINK" = "true" ]; then
  # Make initrd symlinks for all matching kernel symlinks:
  ( cd boot
    for symlink in $(find . -type l -name "vmlinuz-*") ; do
      SYMLINK_VERSION=$(strings $symlink | grep '([^ ]*@[^ ]*) #' | cut -f1 -d' ')
      if [ "$SYMLINK_VERSION" = "$KERNEL_VERSION" ]; then
        KERNEL_NAME="$(echo $symlink | cut -f 2- -d -)"
        rm -f initrd-${KERNEL_NAME}.img
        ln -sf initrd-${KERNEL_VERSION}.img initrd-${KERNEL_NAME}.img
      fi
    done
  )
fi

if [ "$GENINITRD_INITRD_GZ_SYMLINK" = "true" ]; then
  ( cd boot
    rm -f initrd.gz
    ln -sf initrd-${KERNEL_VERSION}.img initrd.gz
  )
fi