[coreboot-gerrit] Patch set updated for coreboot: 9398141 util: Add miniconfig, a script to minimize coreboot configurations

[Stefan Reinauer (stefan.reinauer@coreboot.org)]

Stefan Reinauer (stefan.reinauer at coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8974

-gerrit

commit 9398141483e513b696f297f718cf484455f45b94
Author: Stefan Reinauer <stefan.reinauer at coreboot.org>
Date:   Tue Mar 24 21:46:52 2015 +0100

    util: Add miniconfig, a script to minimize coreboot configurations
    
    This script produces a "minimal" configuration from a full coreboot
    configuration, e.g. a configuration file that only contains the differences
    between the default configuration of a board and the input configuration
    file.
    
    Usage: util/kconfig/miniconfig config.big config.mini
    
    This will read config.big and produce config.mini. If you omit config.mini,
    config.big will be changed in place.
    
    Minimal configurations are easier to read and more robust when reusing
    them among different versions of coreboot as they reflect exactly the
    changes made to the default configuration instead of a full snapshot
    of all configuration options.
    
    Change-Id: Ifbee49e0192c2c557b18bcc1a92fe2a5d5164a3a
    Signed-off-by: Stefan Reinauer <stefan.reinauer at coreboot.org>
---
 util/kconfig/miniconfig | 88 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)

diff --git a/util/kconfig/miniconfig b/util/kconfig/miniconfig
new file mode 100755
index 0000000..a10501a
--- /dev/null
+++ b/util/kconfig/miniconfig
@@ -0,0 +1,88 @@
+#!/bin/bash
+#
+# miniconfig - utility to minimize your coreboot config files
+#
+# Copyright 2015 Google Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+
+CONFIG=$1
+NEWCONFIG=$2
+
+CONF=build/util/kconfig/conf
+KCONFIG=src/Kconfig
+DOTCONFIG=.config
+PREVCONFIG=.config.prev
+TMPCONFIG=.config.mini
+
+recreate_config()
+{
+	$CONF --olddefconfig $KCONFIG &> /dev/null
+}
+
+if [ "$CONFIG" == "" ]; then
+  printf "usage: util/miniconfig/miniconfig [path to config file] <path to new config file>\n"
+  exit 0
+fi
+
+if [ ! -r "$CONFIG" ]; then
+  printf "Can't read $CONFIG.\n"
+  exit 1
+fi
+
+if [ "$CONFIG" == .config ]; then
+  printf "Can't use .config, it's overwritten. Make a backup.\n"
+  exit 1
+fi
+
+if [ ! -x "$CONF" ]; then
+  printf "conf utility at $CONF not available.\n"
+  exit 1
+fi
+
+# Start out by creating a default config file for a mainboard
+VENDOR=$( grep ^CONFIG_VENDOR "$CONFIG" )
+BOARD=$( grep ^CONFIG_BOARD "$CONFIG" | grep -v ROMSIZE | grep -v SPECIFIC_OPTIONS )
+
+printf "$VENDOR\n$BOARD\n" > "$TMPCONFIG"
+cp "$TMPCONFIG" "$DOTCONFIG"
+recreate_config
+
+LINES=$( cat "$CONFIG" | wc -l )
+CUR=1
+
+# Now go through each line of the existing, large config file, add it to our
+# new minimal config file, and see if it makes a difference when running "make
+# olddefconfig". If it does, keep the line, otherwise discard it.
+
+cat "$CONFIG" | while read L; do
+  printf "\rProcessing $CONFIG - $CUR / $LINES (%d%%)" $(( $CUR * 100 / $LINES))
+  mv "$DOTCONFIG" "$PREVCONFIG"
+  cp "$TMPCONFIG" "$DOTCONFIG"
+  echo "$L" >> "$DOTCONFIG"
+  recreate_config
+
+  if ! diff -q "$DOTCONFIG" "$PREVCONFIG" > /dev/null; then
+    echo "$L" >> "$TMPCONFIG"
+  fi
+  CUR=$(( $CUR + 1 ))
+done
+
+echo
+
+if [ "$NEWCONFIG" != "" ]; then
+  printf "Writing new, minimized config to $NEWCONFIG\n"
+  mv "$TMPCONFIG" "$NEWCONFIG"
+else
+  printf "Overwriting $CONFIG with new, minimized config.\n"
+  mv "$TMPCONFIG" "$CONFIG"
+fi
+