Documentation/acpi/initramfs-add-dsdt.sh

   1 #!/bin/bash
   2 # Adds a DSDT file to the initrd (if it's an initramfs)
   3 # first argument is the name of archive
   4 # second argument is the name of the file to add
   5 # The file will be copied as /DSDT.aml
   6
   7 # 20060126: fix "Premature end of file" with some old cpio (Roland Robic)
   8 # 20060205: this time it should really work
   9
  10 # check the arguments
  11 if [ $# -ne 2 ]; then
  12         program_name=$(basename $0)
  13         echo "\
  14 $program_name: too few arguments
  15 Usage: $program_name initrd-name.img DSDT-to-add.aml
  16 Adds a DSDT file to an initrd (in initramfs format)
  17
  18   initrd-name.img: filename of the initrd in initramfs format
  19   DSDT-to-add.aml: filename of the DSDT file to add
  20   " 1>&2
  21     exit 1
  22 fi
  23
  24 # we should check it's an initramfs
  25
  26 tempcpio=$(mktemp -d)
  27 # cleanup on exit, hangup, interrupt, quit, termination
  28 trap 'rm -rf $tempcpio' 0 1 2 3 15
  29
  30 # extract the archive
  31 gunzip -c "$1" > "$tempcpio"/initramfs.cpio || exit 1
  32
  33 # copy the DSDT file at the root of the directory so that we can call it "/DSDT.aml"
  34 cp -f "$2" "$tempcpio"/DSDT.aml
  35
  36 # add the file
  37 cd "$tempcpio"
  38 (echo DSDT.aml | cpio --quiet -H newc -o -A -O "$tempcpio"/initramfs.cpio) || exit 1
  39 cd "$OLDPWD"
  40
  41 # re-compress the archive
  42 gzip -c "$tempcpio"/initramfs.cpio > "$1"
  43