build-experiment-tool/feature-extractor.sh

#!/bin/bash
# Copyright (c) 2016 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Usage: ./feature-extractor.sh /path/to/build-mapper/output-directory
# Provided that the directory given has a number of folders called "x.build",
# in chronological order, this script will work.

export FEATURE_DIR="$(realpath $(dirname $0))/features"
export OUTPUT_DIR="$(realpath $1)"

cd $OUTPUT_DIR

features=""

for feature in $FEATURE_DIR/binary/*; do
  [ -x $feature ] && (
    features="$features $feature"
    ls -tr | grep '\.build' | (
      read prev
      while read next; do
        $feature $prev $next
        prev=$next
      done
    ) > "$(basename $feature).feature"
  ) &
done

for feature in $FEATURE_DIR/unary/*; do
  [ -x $feature ] && (
    features="$features $feature"
    ls -tr | grep '\.build' | (
      read prev
      while read next; do
        $feature $next
      done
    ) > "$(basename $feature).feature"
  ) &
done

for feature in $FEATURE_DIR/unary/*; do
  [ -x $feature ] && (
    features="$features $feature-change"
    ls -tr | grep '\.build' | (
      read prev
      while read next; do
        u=$($feature $prev)
        v=$($feature $next)
        echo $((v-u))
        prev=$next
      done
    ) > "$(basename $feature)-change.feature"
  ) &
done

wait

# Order the commits in time order.
for file in $features; do
  echo "Reversing $file"
  tac $file > .tmp
  echo "Moving $file"
  mv .tmp $file
done