source: mainline/contrib/tools/random_check.sh

#!/bin/sh

#
# Copyright (c) 2014 Vojtech Horky
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#


LOOPS=1
JOBS=1
MAX_RETRIES=20
FILENAME_PREFIX=random_run_
PRUNE_CONFIG_FILE=${FILENAME_PREFIX}prune.config

echo -n "">"$PRUNE_CONFIG_FILE"

while getopts n:j:x:hs option; do
        case $option in
        n)
                LOOPS="$OPTARG"
                ;;
        j)
                JOBS="$OPTARG"
                ;;
        x)
                echo "$OPTARG" | tr -d ' ' >>"$PRUNE_CONFIG_FILE"
                ;;
        s)
                ;;
        *|h)
                echo "Usage: $0 [options]"
                echo "where [options] could be:"
                echo
                echo "  -n LOOPS"
                echo "      How many configurations to check."
                echo "      (Default is one configuration.)"
                echo "  -j PARALLELISM"
                echo "      How many parallel jobs to execute by 'make'."
                echo "      (Default is single job configuration.)"
                echo "  -s"
                echo "      Use only supported compilers."
                echo "      (That is, only GCC cross-compiler and Clang.)"
                echo "  -x CONFIG_OPTION=value"
                echo "      Skip the configuration if this option is present."
                echo "      (Example: CONFIG_BINUTILS=n means that only configurations"
                echo "      where binutils *are* included would be built.)"
                echo "  -h"
                echo "      Print this help and exit."
                echo
                if [ "$option" = "h" ]; then
                        exit 0
                else
                        exit 1
                fi
                ;;
        esac
done


COUNTER=0
FAILED=0
while [ $COUNTER -lt $LOOPS ]; do
        COUNTER=$(( $COUNTER + 1 ))
        echo "Try #$COUNTER ($FAILED failed):" >&2

        (
                echo "  Cleaning after previous build." >&2
                make distclean -j$JOBS 2>&1 || exit 1


                echo "  Preparing random configuration." >&2
                # It would be nicer to allow set the constraints directly to
                # the tools/config.py script but this usually works.
                # We retry $MAX_RETRIES before aborting this run completely.
                RETRIES=0
                while true; do
                        RETRIES=$(( $RETRIES + 1 ))
                        if [ $RETRIES -ge $MAX_RETRIES ]; then
                                echo "  Failed to generate random configuration with given constraints after $RETRIES tries." >&2
                                exit 2
                        fi

                        make random-config 2>&1 || exit 1

                        tr -d ' ' <Makefile.config >"${FILENAME_PREFIX}config.trimmed"

                        THIS_CONFIG_OKAY=true
                        while read pattern; do
                                if grep -q -e "$pattern" "${FILENAME_PREFIX}config.trimmed"; then
                                        THIS_CONFIG_OKAY=false
                                        break
                                fi
                        done <"$PRUNE_CONFIG_FILE"

                        rm -f "${FILENAME_PREFIX}config.trimmed"

                        if $THIS_CONFIG_OKAY; then
                                break
                        fi
                done


                # Report basic info about the configuration and build it
                BASIC_CONFIG=`sed -n \
                        -e 's#PLATFORM = \(.*\)#\1#p' \
                        -e 's#MACHINE = \(.*\)#\1#p' \
                        -e 's#COMPILER = \(.*\)#\1#p' \
                        Makefile.config \
                        | paste '-sd,' | sed 's#,#, #g'`
                echo -n "  Building ($BASIC_CONFIG)... " >&2

                make -j$JOBS 2>&1
                if [ $? -eq 0 ]; then
                        echo "okay." >&2
                        exit 0
                else
                        echo "failed." >&2
                        exit 1
                fi

        ) >random_run_$COUNTER.log
        RC=$?

        if [ $RC -ne 0 ]; then
                tail -n 10 random_run_$COUNTER.log | sed 's#.*#    | &#'
                FAILED=$(( $FAILED + 1 ))
        fi

        if [ -e Makefile.config ]; then
                cp Makefile.config "$FILENAME_PREFIX$COUNTER.Makefile.config"
                cp config.h "$FILENAME_PREFIX$COUNTER.config.h"
        fi
done

rm "$PRUNE_CONFIG_FILE"

echo "Out of $LOOPS tries, $FAILED configurations failed to compile." >&2