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#!/bin/sh
###############################################################################
# BRLTTY - A background process providing access to the console screen (when in
# text mode) for a blind person using a refreshable braille display.
#
# Copyright (C) 1995-2014 by The BRLTTY Developers.
#
# BRLTTY comes with ABSOLUTELY NO WARRANTY.
#
# This is free software, placed 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. Please see the file LICENSE-GPL for details.
#
# Web Page: http://mielke.cc/brltty/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################
. "`dirname "${0}"`/prologue.sh"
addProgramOption d string.anything defaultIdentifier "specify a default identifier"
addProgramOption f string.file outputFile "specify a file in which to write the identifier" "standard output"
addProgramOption s flag quotedString "render the identifier as a quoted string"
addProgramParameter source sourceRoot "top-level directory of source tree"
parseProgramArguments "${@}"
[ -e "${sourceRoot}" ] || semanticError "directory not found: ${sourceRoot}"
[ -d "${sourceRoot}" ] || semanticError "not a directory: ${sourceRoot}"
export GIT_WORK_TREE="${sourceRoot}"
export GIT_DIR="${GIT_WORK_TREE}/.git"
if [ -d "${GIT_DIR}" ]
then
revisionIdentifier="`git describe --tags --abbrev=8 --dirty='M' --match='BRLTTY-*' 2>/dev/null`"
elif [ -d "${sourceRoot}/.svn" ]
then
revisionIdentifier="`svnversion -n "${sourceRoot}" 2>/dev/null`"
[ "${revisionIdentifier}" != "exported" ] || revisionIdentifier=""
else
logMessage warning "unrecognized source repository type: ${sourceRoot}"
revisionIdentifier=""
fi
[ -n "${revisionIdentifier}" ] || {
[ -n "${defaultIdentifier}" ] || semanticError "revision identifier not known"
revisionIdentifier="${defaultIdentifier}"
}
"${quotedString}" && revisionIdentifier='"'"${revisionIdentifier}"'"'
if [ -z "${outputFile}" ]
then
echo "${revisionIdentifier}"
else
if [ -e "${outputFile}" ]
then
[ -f "${outputFile}" ] || semanticError "not a file: ${outputFile}"
[ -r "${outputFile}" ] || semanticError "file not readable: ${outputFile}"
exec 3<"${outputFile}"
read <&3 -r firstLine && {
[ "${firstLine}" != "${revisionIdentifier}" ] || read <&3 -r secondLine || exit 0
}
exec 3<&-
[ -w "${outputFile}" ] || semanticError "file not writable: ${outputFile}"
else
outputDirectory="$(dirname "${outputFile}")"
[ -d "${outputDirectory}" ] || semanticError "not a directory: ${outputDirectory}"
[ -w "${outputDirectory}" ] || semanticError "directory not writable: ${outputDirectory}"
fi
echo "${revisionIdentifier}" >"${outputFile}"
fi
exit 0
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