Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / scripts / extract-ikconfig

diff --git a/kernel/scripts/extract-ikconfig b/kernel/scripts/extract-ikconfig
new file mode 100755 (executable)
index 0000000..3b42f25
--- /dev/null
+++ b/kernel/scripts/extract-ikconfig
@@ -0,0 +1,68 @@
+#!/bin/sh
+# ----------------------------------------------------------------------
+# extract-ikconfig - Extract the .config file from a kernel image
+#
+# This will only work when the kernel was compiled with CONFIG_IKCONFIG.
+#
+# The obscure use of the "tr" filter is to work around older versions of
+# "grep" that report the byte offset of the line instead of the pattern.
+#
+# (c) 2009,2010 Dick Streefland <dick@streefland.net>
+# Licensed under the terms of the GNU General Public License.
+# ----------------------------------------------------------------------
+
+cf1='IKCFG_ST\037\213\010'
+cf2='0123456789'
+
+dump_config()
+{
+       if      pos=`tr "$cf1\n$cf2" "\n$cf2=" < "$1" | grep -abo "^$cf2"`
+       then
+               pos=${pos%%:*}
+               tail -c+$(($pos+8)) "$1" | zcat > $tmp1 2> /dev/null
+               if      [ $? != 1 ]
+               then    # exit status must be 0 or 2 (trailing garbage warning)
+                       cat $tmp1
+                       exit 0
+               fi
+       fi
+}
+
+try_decompress()
+{
+       for     pos in `tr "$1\n$2" "\n$2=" < "$img" | grep -abo "^$2"`
+       do
+               pos=${pos%%:*}
+               tail -c+$pos "$img" | $3 > $tmp2 2> /dev/null
+               dump_config $tmp2
+       done
+}
+
+# Check invocation:
+me=${0##*/}
+img=$1
+if     [ $# -ne 1 -o ! -s "$img" ]
+then
+       echo "Usage: $me <kernel-image>" >&2
+       exit 2
+fi
+
+# Prepare temp files:
+tmp1=/tmp/ikconfig$$.1
+tmp2=/tmp/ikconfig$$.2
+trap "rm -f $tmp1 $tmp2" 0
+
+# Initial attempt for uncompressed images or objects:
+dump_config "$img"
+
+# That didn't work, so retry after decompression.
+try_decompress '\037\213\010' xy    gunzip
+try_decompress '\3757zXZ\000' abcde unxz
+try_decompress 'BZh'          xy    bunzip2
+try_decompress '\135\0\0\0'   xxx   unlzma
+try_decompress '\211\114\132' xy    'lzop -d'
+try_decompress '\002\041\114\030' xyy 'lz4 -d -l'
+
+# Bail out:
+echo "$me: Cannot find kernel config." >&2
+exit 1