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#! /bin/bash

########################################################################

#

# File:    reg_periodic

# Author:  Janis Johnson

# Date:    2002/12/28

#

# Over a range of dates at specified intervals, invoke separate tools to

# update sources, do a build, and run one or more tests.

#

# Define these in a file whose name is the argument to this script:

#   LOW_DATE:   Date string recognized by the date command.

#   HIGH_DATE:  Date string recognized by the date command.

#   INTERVAL:   Time (in seconds) between dates for which to build.

#   REG_UPDATE: Pathname of script to update your source tree.

#   REG_BUILD:  Pathname of script to build enough of the product to run

#               the test.

#   REG_TEST:   Pathname of script to run one or more tests.

# Optional:

#   VERBOSITY:  Default is 0, to print only errors and final message.

#   DATE_IN_MSG If set to anything but 0, include the time and date in

#               messages

#   REG_STOP    Pathname of a file whose existence says to quit; default

#               is STOP in the current directory.

#

#

# Copyright (c) 2002, 2003, 2005 Free Software Foundation, Inc.

#

# This file 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; either version 2 of the License, or

# (at your option) any later version.

#

# 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.

#

# For a copy of the GNU General Public License, write the the

# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

# Boston, MA 02110-1301, USA.

#

########################################################################

########################################################################

# Functions

########################################################################

# Issue a message if its verbosity level is high enough.

msg() {

  test ${1} -gt ${VERBOSITY}  && return

  if [ "x${DATE_IN_MSG}" = "x" ]; then

    echo "${2}"

  else

    echo "`${DATE}`  ${2}"

  fi

}

# Issue an error message and exit with a nonzero status.

error() {

  msg 0 "error: ${1}"

  exit 1

}

# Turn seconds since the epoch into a date we can use with source

# control tools and report to the user.

make_date() {

  MADE_DATE="`${DATE} -u +\"%Y-%m-%d %H:%M %Z\" --date \"1970-01-01 ${1} seconds\"`" \

    || error "make_date: date command failed"

}

# Build the components to test using sources as of a particular date and

# run a test case.  Pass each of the scripts the date that we're

# testing; the first one needs it, the others can ignore it if they want.

process_date() {

  TEST_DATE="${1}"

  ${REG_UPDATE} "${TEST_DATE}"

  if [ $? -ne 0 ]; then

    msg 0 "source update failed for ${TEST_DATE}"

    return

  fi

  ${REG_BUILD} "${TEST_DATE}"

  if [ $? -ne 0 ]; then

    msg 0 "build failed for ${TEST_DATE}"

    return

  fi

  ${REG_TEST} "${TEST_DATE}"

}

########################################################################

# Main program (so to speak)

########################################################################

# If DATE isn't defined, use the default date command; the configuration

# file can override this.

if [ "x${DATE}" = "x" ]; then

  DATE=date

fi

# Process the configuration file.

if [ $# -ne 1 ]; then

  echo Usage: $0 config_file

  exit 1

fi

CONFIG=${1}

if [ ! -f ${CONFIG} ]; then

  error "configuration file ${CONFIG} does not exist"

fi

# OK, the config file exists.  Source it, make sure required parameters

# are defined and their files exist, and give default values to optional

# parameters.

. ${CONFIG}

test "x${REG_UPDATE}" = "x" && error "REG_UPDATE is not defined"

test "x${REG_BUILD}" = "x" && error "REG_BUILD is not defined"

test "x${REG_TEST}" = "x" && error "REG_TEST is not defined"

test "x${INTERVAL}" = "x" && error "INTERVAL is not defined"

test -x ${REG_TEST} || error "REG_TEST is not an executable file"

test "x${VERBOSITY}" = "x" && VERBOSITY=0

test "x${REG_STOP}" = "x" && REG_STOP="STOP"

msg 2 "LOW_DATE   = ${LOW_DATE}"

msg 2 "HIGH_DATE  = ${HIGH_DATE}"

msg 2 "INTERVAL   = ${INTERVAL}"

msg 2 "REG_UPDATE = ${REG_UPDATE}"

msg 2 "REG_BUILD  = ${REG_BUILD}"

msg 2 "REG_TEST   = ${REG_TEST}"

msg 2 "VERBOSITY  = ${VERBOSITY}"

# Change the dates into seconds since the epoch.  This uses an extension

# in GNU date.

LOW_DATE=`${DATE} +%s --date "${LOW_DATE}"` || \

  error "date command failed for \"${LOW_DATE}\""

HIGH_DATE=`${DATE} +%s --date "${HIGH_DATE}"` || \

  error "date command failed for \"${LOW_DATE}\""

# Process each date in the range.

while [ ${LOW_DATE} -le ${HIGH_DATE} ]; do

  # If a file called STOP appears, stop; this allows a clean way to

  # interrupt a search.

  if [ -f ${REG_STOP} ]; then

    msg 0 "STOP file detected"

    rm -f ${REG_STOP}

    exit 1

  fi

  # Get a version of the date that is usable by tools and readable

  # by people, then process it.

  make_date ${LOW_DATE}

  process_date "${MADE_DATE}"

  let LOW_DATE=LOW_DATE+INTERVAL

done

msg 1 "done"