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[linux-2.6.git] / scripts / extract-ikconfig

diff --git a/scripts/extract-ikconfig b/scripts/extract-ikconfig
index d9f9f34..8e526d3 100755 (executable)
--- a/scripts/extract-ikconfig
+++ b/scripts/extract-ikconfig
@@ -1,31 +1,9 @@
-#!/bin/sh
+#! /bin/bash 
 # extracts .config info from a [b]zImage file
 # uses: binoffset (new), dd, zcat, strings, grep
 # $arg1 is [b]zImage filename
 
-binoffset="./scripts/binoffset"
-
-IKCFG_ST="0x49 0x4b 0x43 0x46 0x47 0x5f 0x53 0x54"
-IKCFG_ED="0x49 0x4b 0x43 0x46 0x47 0x5f 0x45 0x44"
-function dump_config {
-    typeset file="$1"
-
-    start=`$binoffset $file $IKCFG_ST 2>/dev/null`
-    [ "$?" != "0" ] && start="-1"
-    if [ "$start" -eq "-1" ]; then
-       return
-    fi
-    end=`$binoffset $file $IKCFG_ED 2>/dev/null`
-
-    let start="$start + 8"
-    let size="$end - $start"
-
-    head --bytes="$end" "$file" | tail --bytes="$size" | zcat
-
-    clean_up
-    exit 0
-}
-
+TMPFILE=""
 
 usage()
 {
@@ -34,7 +12,8 @@ usage()
 
 clean_up()
 {
-       if [ "$TMPFILE" != "" ]; then
+       if [ -z $ISCOMP ]
+       then
                rm -f $TMPFILE
        fi
 }
@@ -42,36 +21,46 @@ clean_up()
 if [ $# -lt 1 ]
 then
        usage
-       exit 1
+       exit
 fi
 
-TMPFILE="/tmp/ikconfig-$$"
-image="$1"
+image=$1
 
-# vmlinux: Attempt to dump the configuration from the file directly
-dump_config "$image"
+# There are two gzip headers, as well as arches which don't compress their
+# kernel.
+GZHDR="0x1f 0x8b 0x08 0x00"
+if [ `binoffset $image $GZHDR >/dev/null 2>&1 ; echo $?` -ne 0 ]
+then
+       GZHDR="0x1f 0x8b 0x08 0x08"
+       if [ `binoffset $image $GZHDR >/dev/null 2>&1 ; echo $?` -ne 0 ]
+       then
+               ISCOMP=0
+       fi
+fi
 
-GZHDR1="0x1f 0x8b 0x08 0x00"
-GZHDR2="0x1f 0x8b 0x08 0x08"
+PID=$$
 
-# vmlinux.gz: Check for a compressed images
-off=`$binoffset "$image" $GZHDR1 2>/dev/null`
-[ "$?" != "0" ] && off="-1"
-if [ "$off" -eq "-1" ]; then
-       off=`$binoffset "$image" $GZHDR2 2>/dev/null`
-       [ "$?" != "0" ] && off="-1"
-fi
-if [ "$off" -eq "0" ]; then
-       zcat <"$image" >"$TMPFILE"
-       dump_config "$TMPFILE"
-elif [ "$off" -ne "-1" ]; then
-       (dd ibs="$off" skip=1 count=0 && dd bs=512k) <"$image" 2>/dev/null | \
-               zcat >"$TMPFILE"
-       dump_config "$TMPFILE"
+# Extract and uncompress the kernel image if necessary
+if [ -z $ISCOMP ]
+then
+       TMPFILE="/tmp/`basename $image`.vmlin.$PID"
+       dd if=$image bs=1 skip=`binoffset $image $GZHDR` 2> /dev/null | zcat > $TMPFILE
+else
+       TMPFILE=$image
 fi
 
-echo "ERROR: Unable to extract kernel configuration information."
-echo "       This kernel image may not have the config info."
+# Look for strings.
+strings $TMPFILE | grep "CONFIG_BEGIN=n" > /dev/null
+if [ $? -eq 0 ]
+then
+       strings $TMPFILE | awk "/CONFIG_BEGIN=n/,/CONFIG_END=n/" > $image.oldconfig.$PID
+else
+       echo "ERROR: Unable to extract kernel configuration information."
+       echo "       This kernel image may not have the config info."
+       clean_up
+       exit 1
+fi
 
+echo "Kernel configuration written to $image.oldconfig.$PID"
 clean_up
-exit 1
+exit 0