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https://github.com/autc04/Retro68.git
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364 lines
11 KiB
Bash
Executable File
364 lines
11 KiB
Bash
Executable File
#! /bin/bash
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#set -x
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########################################################################
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#
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# File: reg-hunt
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# Author: Janis Johnson <janis187@us.ibm.com>
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# Date: 2003/08/19
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#
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# Search for the patch identifier for which results for a test changed,
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# using a binary search. The functionality for getting sources,
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# building the component to test, and running the test are in other
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# scripts that are run from here. Before the search begins, we verify
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# that we get the expected behavior for the first and last patch
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# identifiers.
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#
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# Define these in a file whose name is the argument to this script:
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# LOW_PATCH: Patch identifier.
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# HIGH_PATCH: Patch identifier.
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# REG_UPDATE: Pathname of script to update your source tree; returns
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# zero for success, nonzero for failure.
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# REG_BUILD: Pathname of script to build enough of the product to run
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# the test; returns zero for success, nonzero for failure.
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# REG_TEST: Pathname of script to run the test; returns 1 if we
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# should search later patches, 0 if we should search
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# earlier patches, and something else if there was an
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# unexpected failure.
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# Optional:
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# REG_REPORT Pathname of script to call at the end with the id of the
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# patch that caused the change in behavior.
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# REG_FINISH Pathname of script to call at the end with the two final
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# patch identifiers as arguments.
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# REG_NEWMID Pathname of script to call when a build has failed, with
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# arguments of the failed id and the current low and high
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# SKIP_LOW If 1, skip verifying the low patch identifier of the
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# range; define this only if you're restarting and have
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# already tested the low patch.
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# SKIP_HIGH If 1, skip verifying the high patch identifier of the
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# range; define this only if you're restarting and have
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# already tested the high patch.
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# FIRST_MID Use this as the first midpoint, to avoid a midpoint that
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# is known not to build.
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# VERBOSITY Default is 0, to print only errors and final message.
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# DATE_IN_MSG If set to anything but 0, include the time and date in
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# messages.
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#
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#
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#
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# Copyright (c) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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#
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# This file is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# For a copy of the GNU General Public License, write the the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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# Boston, MA 02111-1301, USA.
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#
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########################################################################
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########################################################################
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# Functions
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########################################################################
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# Issue a message if its verbosity level is high enough.
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msg() {
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test ${1} -gt ${VERBOSITY} && return
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if [ "x${DATE_IN_MSG}" = "x" ]; then
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echo "${2}"
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else
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echo "`date` ${2}"
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fi
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}
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# Issue an error message and exit with a non-zero status. If there
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# is a valid current range whose end points have been tested, report
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# it so the user can start again from there.
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error() {
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msg 0 "error: ${1}"
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test ${VALID_RANGE} -eq 1 && \
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echo "current range:"
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echo "LOW_PATCH=${LATER_THAN}"
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echo "HIGH_PATCH=${EARLIER_THAN}"
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exit 1
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}
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# Build the components to test using sources as of a particular patch
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# and run a test case. Pass each of the scripts the patch identifier
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# that we're testing; the first one needs it, the others can ignore it
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# if they want.
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process_patch () {
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TEST_ID=${1}
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# If we're keeping track of known failures, see if TEST_ID is one and
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# if so, don't bother updating sources and trying to build.
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FAILS=0
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SKIP=0
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if [ ${SKIP_FAILURES} -eq 1 ]; then
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${REG_CHECKFAIL} ${TEST_ID}
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if [ $? -eq 0 ]; then
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msg 1 "skipping ${TEST_ID}; it is a known build failure"
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FAILS=1
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SKIP=1
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fi
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fi
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if [ ${FAILS} -eq 0 ]; then
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${REG_UPDATE} ${TEST_ID} || error "source update failed for ${TEST_ID}"
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${REG_BUILD} ${TEST_ID}
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if [ $? -ne 0 ]; then
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FAILS=1
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msg 1 "build failed for ${TEST_ID}"
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if [ ${SKIP_FAILURES} -eq 1 ]; then
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${REG_RECORDFAIL} ${TEST_ID}
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fi
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fi
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fi
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if [ ${FAILS} -eq 0 ]; then
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${REG_TEST} ${TEST_ID}
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LATER=$?
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if [ $LATER -ne 0 -a $LATER -ne 1 ]; then
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msg 0 "unexpected test failure for ${TEST_ID}"
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exit 1
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fi
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else
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# The build failed, or this patch is already known to fail to build.
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# If it's an endpoint, or if we don't have a way to recover from
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# build failures, quit now.
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if [ ${SKIP} -eq 0 ]; then
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if [ "x${REG_NEWMID}" == "x" \
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-o ${TEST_ID} -eq ${LATER_THAN} \
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-o ${TEST_ID} -eq ${EARLIER_THAN} ]; then
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error "build failed for ${TEST_ID}"
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fi
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fi
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# Try to find a new patch to try within the current range.
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FIRST_MID=`${REG_NEWMID} ${LATER_THAN} ${EARLIER_THAN}`
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if [ ${FIRST_MID} -eq 0 ]; then
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# The heuristics in the tool ran out of patches to try next;
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# let the user handle it from here.+
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error "build failed for ${TEST_ID}, could not find new candidate"
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fi
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msg 1 "using ${FIRST_MID}, between ${LATER_THAN} and ${EARLIER_THAN}"
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fi
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# Return with a valid LATER value or a new ID to try in FIRST_MID.
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}
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# Get the number of a patch within the range. It's not actually the
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# middle one, but the one that might minimize the number of checks.
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get_mid_special() {
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LOW=$1
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HIGH=$2
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let DIFF=HIGH-LOW
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M=1
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POWER2=1
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while
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[ $POWER2 -lt $DIFF ]
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do
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let M=POWER2
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let POWER2=POWER2*2
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done
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let MID=LOW+M
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}
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# Get the number of the patch in the middle of the range.
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get_mid () {
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LOW=$1
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HIGH=$2
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let DIFF=HIGH-LOW
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let M=DIFF/2
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let MID=LOW+M
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}
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# Perform a binary search on patch identifiers within the range
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# specified by the arguments.
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search_patches () {
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LOW=$1
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HIGH=$2
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# Get an identifier within the range. The user can override the
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# initial mid patch if it is known to have problems, e.g., if a
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# build fails for that patch.
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if [ ${FIRST_MID} -ne 0 ]; then
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MID=${FIRST_MID}
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FIRST_MID=0
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let DIFF=HIGH-LOW
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else
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get_mid $LOW $HIGH
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fi
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while [ ${DIFF} -gt 1 ]; do
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TEST_ID="${MID}"
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# Test it.
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process_patch ${TEST_ID}
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# FIRST_MID being set is a signal that the build failed and we
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# should start over again.
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test ${FIRST_MID} -ne 0 && return
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# Narrow the search based on the outcome of testing TEST_ID.
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if [ ${LATER} -eq 1 ]; then
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msg 1 "search patches later than ${TEST_ID}"
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LATER_THAN=${TEST_ID}
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let LOW=MID
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else
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msg 1 "search patches earlier than ${TEST_ID}"
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EARLIER_THAN=${TEST_ID}
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let HIGH=MID
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fi
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get_mid $LOW $HIGH
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done
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}
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########################################################################
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# Main program (so to speak)
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########################################################################
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# The error function uses this.
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VALID_RANGE=0
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# Process the configuration file.
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if [ $# != 1 ]; then
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echo Usage: $0 config_file
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exit 1
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fi
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CONFIG=${1}
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if [ ! -f ${CONFIG} ]; then
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error "configuration file ${CONFIG} does not exist"
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fi
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# OK, the config file exists. Source it, make sure required parameters
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# are defined and their files exist, and give default values to optional
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# parameters.
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. ${CONFIG}
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test "x${REG_UPDATE}" = "x" && error "REG_UPDATE is not defined"
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test "x${REG_BUILD}" = "x" && error "REG_BUILD is not defined"
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test "x${REG_TEST}" = "x" && error "REG_TEST is not defined"
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test -x ${REG_TEST} || error "REG_TEST is not an executable file"
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test "x${SKIP_LOW}" = "x" && SKIP_LOW=0
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test "x${SKIP_HIGH}" = "x" && SKIP_HIGH=0
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test "x${VERBOSITY}" = "x" && VERBOSITY=0
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test "x${REG_FINISH}" = "x" && REG_FINISH=true
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test "x${REG_REPORT}" = "x" && REG_REPORT=true
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msg 2 "LOW_PATCH = ${LOW_PATCH}"
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msg 2 "HIGH_PATCH = ${HIGH_PATCH}"
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msg 2 "REG_UPDATE = ${REG_UPDATE}"
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msg 2 "REG_BUILD = ${REG_BUILD}"
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msg 2 "REG_TEST = ${REG_TEST}"
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msg 2 "REG_NEWMID = ${REG_NEWMID}"
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msg 2 "SKIP_LOW = ${SKIP_LOW}"
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msg 2 "SKIP_HIGH = ${SKIP_HIGH}"
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msg 2 "FIRST_MID = ${FIRST_MID}"
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msg 2 "VERBOSITY = ${VERBOSITY}"
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# If REG_NEWMID was defined, assume that we're skipping known failures
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# and adding to the list for new failures. If the list of failures
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# doesn't exist, create it. We use a different flag, SKIP_FAILURES,
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# to make it easier to separate the flag from REG_NEWMID if we want
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# to change the usage later.
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if [ "x${REG_NEWMID}" != "x" ]; then
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touch ${REG_FAILLIST}
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SKIP_FAILURES=1
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else
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SKIP_FAILURES=0
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fi
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# If FIRST_MID was defined, make sure it's in the range.
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if [ "x${FIRST_MID}" != "x" ]; then
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test ${FIRST_MID} -le ${LOW_PATCH} && \
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error "FIRST_MID id is lower than LOW_PATCH"
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test ${FIRST_MID} -ge ${HIGH_PATCH} && \
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error "FIRST_MID is higher than HIGH_PATCH"
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else
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FIRST_MID=0
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fi
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# Keep track of the bounds of the range where the test behavior changes.
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LATER_THAN=${LOW_PATCH}
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EARLIER_THAN=${HIGH_PATCH}
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LATER=1
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msg 1 "LATER_THAN = ${LATER_THAN}"
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msg 1 "EARLIER_THAN = ${EARLIER_THAN}"
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# Verify that the range isn't backwards.
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test ${LOW_PATCH} -lt ${HIGH_PATCH} || \
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error "patch identifier range is backwards"
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# Verify that the first and last patches in the range get the results we
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# expect. If not, quit, because any of several things could be wrong.
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if [ ${SKIP_HIGH} -eq 0 ]; then
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process_patch ${EARLIER_THAN}
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test ${LATER} -ne 0 && \
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error "unexpected result for high patch ${EARLIER_THAN}"
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msg 1 "result for high patch ${EARLIER_THAN} is as expected"
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fi
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if [ ${SKIP_LOW} -eq 0 ]; then
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process_patch ${LATER_THAN}
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test ${LATER} -ne 1 && \
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error "unexpected result for low patch ${LATER_THAN}"
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msg 1 "result for low patch ${LATER_THAN} is as expected"
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fi
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# Search within the range, now that we know that the end points are valid.
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# If the build failed then FIRST_MID is set to a new patch to try.
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VALID_RANGE=1
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while true; do
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search_patches ${LATER_THAN} ${EARLIER_THAN}
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test ${FIRST_MID} -eq 0 && break
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done
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# Report where the test behavior changes.
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echo "Test result changes with id ${EARLIER_THAN}"
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${REG_REPORT} ${EARLIER_THAN}
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# Invoke the optional script to verify the result and report additional
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# information about changes between the two patches.
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${REG_FINISH} ${LATER_THAN} ${EARLIER_THAN}
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