Added initrd helper script

diff --git a/initrd-tool/initrd-extract-here b/initrd-tool/initrd-extract-here
new file mode 100755 (executable)
index 0000000..ba43af7
--- /dev/null
+++ b/initrd-tool/initrd-extract-here
@@ -0,0 +1,39 @@
+#!/bin/sh
+
+###
+### This script is distributed in the terms of GNU GPL v3.0+
+### (c) Andrew Sichevoi, http://thekondor.net
+###
+### Name: initrd-extract-here
+### Description: Helper script to extract initramfs image contents to the current directory
+### Notes: By default initramfs for current kernel version is extracted.
+###
+### Arguments:
+###  name    : %kernel_version%
+###  type    : string
+###  required: optional
+###  default : $(uname -r)
+###
+
+
+### TODO: move C&P code to a common place
+
+PREFIX=/boot/initrd.img-
+CURRENT_VERSION=$(uname -r)
+VERSION=${CURRENT_VERSION}
+
+if [ x"current" = x"$1" -o -z "$1" ]; then
+  VERSION=${CURRENT_VERSION}
+else
+  VERSION=$1
+fi
+
+INITRD_FILENAME=${PREFIX}${VERSION}
+if [ ! -e ${INITRD_FILENAME} ]; then
+  echo "Error: '${INITRD_FILENAME}' is not existent"
+  exit 1
+fi
+
+echo "Initrd to extract: '${INITRD_FILENAME}'"
+
+cat ${INITRD_FILENAME} | gzip -d - | cpio -i

diff --git a/initrd-tool/initrd-pack-here b/initrd-tool/initrd-pack-here
new file mode 100755 (executable)
index 0000000..b648d8f
--- /dev/null
+++ b/initrd-tool/initrd-pack-here
@@ -0,0 +1,51 @@
+#!/bin/sh
+
+###
+### This script is distributed in the terms of GNU GPL v3.0+
+### (c) Andrew Sichevoi, http://thekondor.net
+###
+### Name: initrd-pack-here
+### Description: Helper script to create initramfs image from current the directory
+### Notes: By default an initramfs image is created in the parent directory
+###
+### Arguments
+###   name    : replace
+###   desc    : specifies that initramfs image must be replaced in /boot directory
+###             The next following argument must specify kernel version.
+###   type    : keyword
+###   required: optional
+###   default : -
+###
+###   name    : current
+###   desc    : used with a combination of 'replace' only. Synonym for $(uname -r)
+###   type    : keyword
+###   required: required
+###   default : -
+###
+
+if [ ! -e init -o ! -d scripts ]; then
+  echo "Error: current directory is not contents of initrd"
+  exit 1 
+fi
+
+PREFIX=/boot/initrd.img-
+INITRD_FILENAME=
+if [ x"replace" = x"$1" ]; then
+  if [ x"current" = x"$2" ]; then
+    VERSION=$(uname -r)
+    INITRD_FILENAME=${PREFIX}${VERSION}
+  else
+    INITRD_FILENAME=$2
+  fi
+else
+  INITRD_FILENAME=../initrd.img-$(date +"%R-%F")
+fi
+
+if [ -z "${INITRD_FILENAME}" ]; then
+  echo "Error: Filename of initrd image is not specified"
+  exit 1
+fi
+
+echo "Packing initrd to '${INITRD_FILENAME}'"
+
+find ./ | cpio -H newc --no-absolute-filenames -o | gzip - > ${INITRD_FILENAME}

diff --git a/initrd-tool/initrd-tool b/initrd-tool/initrd-tool
new file mode 100755 (executable)
index 0000000..2e55dba
--- /dev/null
+++ b/initrd-tool/initrd-tool
@@ -0,0 +1,45 @@
+#!/bin/sh
+
+###
+### This script is distributed in the terms of GNU GPL v3.0+
+### (c) Andrew Sichevoi, http://thekondor.net
+###
+### Name: initrd-tool
+### Description: wrapper over initrd image packing and extracting scripts
+### Notes: depends on ``initrd-extract-here'', ``initrd-pack-here''
+###
+### Arguments:
+###  <see usage>
+###
+
+show_usage()
+{
+  echo 'Usage:'
+  echo '  <x-here|extract-here> [<current>|<kernel-version>]'
+  echo '  <p-here|pack-here> [<replace current|filename>]'
+}
+
+INITRD_EXTRACT_TOOL="initrd-extract-here"
+INITRD_PACK_TOOL="initrd-pack-here"
+
+command=$1
+tool=
+case "${command}" in
+  extract-here | x-here)
+        tool=${INITRD_EXTRACT_TOOL}
+        break
+         ;;
+  pack-here | p-here)
+         tool=${INITRD_PACK_TOOL}
+        break
+        ;;
+esac
+
+if [ ! -z "${tool}" ]; then
+  [ ! 0 -eq $# ] && shift
+  ${tool} $@
+  exit $?
+fi
+
+show_usage
+exit 1