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334 lines
9.6 KiB
Bash
334 lines
9.6 KiB
Bash
#!/bin/bash -p
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###############################################################################
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# BRLTTY - A background process providing access to the console screen (when in
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# text mode) for a blind person using a refreshable braille display.
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#
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# Copyright (C) 1995-2012 by The BRLTTY Developers.
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#
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# BRLTTY comes with ABSOLUTELY NO WARRANTY.
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#
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# This is free software, placed under the terms of the
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# GNU General Public License, as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any
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# later version. Please see the file LICENSE-GPL for details.
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#
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# Web Page: http://mielke.cc/brltty/
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#
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# This software is maintained by Dave Mielke <dave@mielke.cc>.
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###############################################################################
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programName="${0##*/}"
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programMessage() {
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echo >&2 "${programName}: ${1}"
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}
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programError() {
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[ -n "${1}" ] && programMessage "${1}"
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exit "${2:-3}"
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}
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syntaxError() {
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programError "${1}" 2
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}
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mount_ext2() {
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mount -o loop -t ext2 "${2}" "${1}"
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}
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unmount_ext2() {
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umount "${1}"
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}
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check_ext2() {
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set -- $(stat -c '%a %s' -f -- "${initrdRoot}")
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initrdAvailableBlocks="${1}"
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initrdBlockSize="${2}"
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set -- $(du --block-size="${initrdBlockSize}" -s "${brlttyInstallRoot}")
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brlttyInstallBlocks="${1}"
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set -- $(stat -c '%s' -- "${initrdImage}")
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initrdImageBytes="${1}"
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initrdImageBlocks=$(( (initrdImageBytes + initrdBlockSize - 1) / initrdBlockSize ))
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initrdPadBlocks=$(( brlttyInstallBlocks - initrdAvailableBlocks ))
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(( (initrdPadBlocks += 200) > 0 )) && {
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initrdMounted=false
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"unmount_${initrdType}" "${initrdRoot}" "${initrdImage}"
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dd bs="${initrdBlockSize}" count="${initrdPadBlocks}" if="/dev/zero" of="${initrdImage}" seek="${initrdImageBlocks}"
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e2fsck -y -f "${initrdImage}" && resize2fs "${initrdImage}" || {
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newImage="${temporaryDirectory}/new.${initrdType}"
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cp -RpPd -- "${initrdImage}" "${newImage}"
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mke2fs -q -b "${initrdBlockSize}" -F "${newImage}"
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newRoot="${temporaryDirectory}/new"
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mkdir "${newRoot}"
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"mount_${initrdType}" "${newRoot}" "${newImage}"
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newMounted=true
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"mount_${initrdType}" "${initrdRoot}" "${initrdImage}"
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initrdMounted=true
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cp -RpPd -- "${initrdRoot}/." "${newRoot}"
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initrdMounted=false
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"unmount_${initrdType}" "${initrdRoot}" "${initrdImage}"
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newMounted=false
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"unmount_${initrdType}" "${newRoot}" "${newImage}"
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cp -- "${newImage}" "${initrdImage}"
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}
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"mount_${initrdType}" "${initrdRoot}" "${initrdImage}"
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initrdMounted=true
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}
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}
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mount_cpio() {
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cd "${1}"
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cpio --quiet -i -I "${2}"
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cd "${workingDirectory}"
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}
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unmount_cpio() {
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cd "${1}"
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[ -n "${2}" ] && {
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find . -print |
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sed -e '/^\.$/d' -e 's/^\.\///' |
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cpio --quiet -o -H newc -O "${2}"
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}
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rm -f -r -- $(ls -1 -A)
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cd "${workingDirectory}"
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}
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check_cpio() {
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:
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}
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originalImage="boot.iso"
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modifiedImage="brltty.iso"
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brlttyPattern="brltty-*"
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brailleDrivers="all"
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textTable="en-nabcc"
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invokeShell=false
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showUsage() {
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cat <<EOF
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Usage: ${programName} [-option ...]
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The following options are supported:
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-i file The original (input) image (default: ${originalImage}).
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-o file The modified (output) image (default: ${modifiedImage}).
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-a file The BRLTTY archive (default: ${brlttyPattern}).
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-b driver,... The braille driver(s) to include (default: ${brailleDrivers}).
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-t file The text table to build in (default: ${textTable}).
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-s Invoke an interactive shell to inspect the modified image.
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-h Display usage information and exit.
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EOF
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exit 0
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}
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while getopts ":i:o:a:b:t:sh" option
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do
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case "${option}"
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in
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i) originalImage="${OPTARG}";;
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o) modifiedImage="${OPTARG}";;
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a) brlttyPattern="${OPTARG}";;
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b) brailleDrivers="${OPTARG}";;
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t) textTable="${OPTARG}";;
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s) invokeShell=true;;
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h) showUsage;;
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\?) syntaxError "unknown option: -${OPTARG}";;
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:) syntaxError "missing operand: -${OPTARG}";;
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*) syntaxError "unimplemented option: -${option}";;
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esac
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done
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shift $((OPTIND - 1))
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[ "${#}" -gt 0 ] && syntaxError "too many parameters."
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[ -f "${originalImage}" ] || programError "original image not found: ${originalImage}"
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shopt -s nullglob extglob
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set -- $brlttyPattern
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[ "${#}" -eq 0 ] && programError "brltty archive not found: ${brlttyPattern}"
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[ "${#}" -gt 1 ] && {
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brlttyArchives="$(echo "${*}" | sed -e 's% %,&%g')"
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programError "more than one brltty archive: ${brlttyArchives}"
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}
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brlttyArchive="${1}"
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cleanup() {
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set +e
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cd /
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"${newMounted}" && "unmount_${initrdType}" "${newRoot}"
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"${initrdMounted}" && "unmount_${initrdType}" "${initrdRoot}"
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"${originalMounted}" && umount "${originalRoot}"
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[ -n "${temporaryDirectory}" ] && rm -r "${temporaryDirectory}"
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}
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set -e
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originalMounted=false
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initrdMounted=false
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newMounted=false
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trap "cleanup" 0
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workingDirectory="${PWD}"
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temporaryDirectory="$(mktemp -d "${TMPDIR:-/tmp}/${programName}.XXXXXX")"
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originalRoot="${temporaryDirectory}/original"
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mkdir "${originalRoot}"
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mount -o loop -t iso9660 "${originalImage}" "${originalRoot}"
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originalMounted=true
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modifiedRoot="${temporaryDirectory}/modified"
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mkdir "${modifiedRoot}"
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cp -RpPd -- "${originalRoot}/." "${modifiedRoot}"
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loaderDirectory=""
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for directory in boot/isolinux isolinux
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do
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[ -d "${originalRoot}/${directory}" ] && {
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loaderDirectory="${directory}"
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break
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}
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done
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configurationFile="isolinux.cfg"
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sed -n -e '
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1i\
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prompt 1\
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timeout 0\
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default text\
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/^ *prompt /d
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/^ *timeout /d
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/^ *default /d
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/^ *menu *default *$/d
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/^ *append.* text/s/$/ nofb/
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/^ *append.* rescue/s/$/ text nofb/
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p
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' <"${originalRoot}/${loaderDirectory}/${configurationFile}" >"${modifiedRoot}/${loaderDirectory}/${configurationFile}"
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# bootMessage="boot.msg"
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# echo -n -e '\a' >"${modifiedRoot}/${loaderDirectory}/${bootMessage}"
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# cat "${originalRoot}/${loaderDirectory}/${bootMessage}" >>"${modifiedRoot}/${loaderDirectory}/${bootMessage}"
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initrdImage="${temporaryDirectory}/initrd.img"
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initrdPath="${modifiedRoot}/${loaderDirectory}/initrd.img"
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gunzip -c "${initrdPath}" >"${initrdImage}"
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initrdDescription="`file -b "${initrdImage}"`"
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case "${initrdDescription}"
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in
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*" ext2 "*) initrdType=ext2;;
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*" cpio "*) initrdType=cpio;;
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*) programError "unsupported initrd image format: ${initrdDescription}"
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esac
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initrdRoot="${temporaryDirectory}/initrd"
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mkdir "${initrdRoot}"
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"mount_${initrdType}" "${initrdRoot}" "${initrdImage}"
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initrdMounted=true
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found=false
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for name in linuxrc init
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do
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linuxrcPath="${initrdRoot}/${name}"
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initPath="$(readlink "${linuxrcPath}")" && {
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found=true
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break
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}
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done
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"${found}" || programError "linuxrc not found."
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rm "${linuxrcPath}"
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ln -s /bin/brltty "${linuxrcPath}"
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deviceDirectory="${initrdRoot}/dev"
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ensureDevices() {
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typeset type="${1}"
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typeset major="${2}"
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typeset minor="${3}"
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typeset prefix="${4}"
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typeset last="${5}"
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typeset suffix="${6}"
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typeset number=0
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while ((number <= last))
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do
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typeset path="${deviceDirectory}/${prefix}${suffix}"
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[ -e "${path}" ] || mknod -m 600 "${path}" "${type}" "${major}" "$((minor++))"
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suffix=$((++number))
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done
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}
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ensureDevices c 7 0 vcs 12
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ensureDevices c 7 128 vcsa 12
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ensureDevices c 5 1 console 0
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ensureDevices c 4 0 tty 12 0
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ensureDevices c 4 64 ttyS 3 0
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ensureDevices c 188 0 ttyUSB 1 0
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case "${brlttyArchive}"
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in
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*.tar.gz|*.tgz)
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tar x -z -C "${temporaryDirectory}" -f "${brlttyArchive}"
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;;
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*.tar)
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tar x -C "${temporaryDirectory}" -f "${brlttyArchive}"
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;;
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*)
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programError "unsupported brltty archive name: ${brlttyArchive}"
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;;
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esac
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shopt -s nullglob
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set -- ${temporaryDirectory}/brltty*
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[ "${#}" -eq 0 ] && programError "brltty build directory not found."
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brlttyBuildRoot="${1}"
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brlttyInstallRoot="${temporaryDirectory}/install"
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(
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set -e
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trap "" 0
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cd "${brlttyBuildRoot}"
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shopt -s nullglob
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set -- ./autogen*
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for autogen
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do
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[ -f "${autogen}" -a -r "${autogen}" -a -x "${autogen}" ] && "${autogen}"
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done
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./configure --quiet --with-install-root="${brlttyInstallRoot}" \
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--with-init-path="${initPath}" --with-stderr-path="/dev/tty5" \
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--with-writable-directory="/tmp" \
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--with-screen-driver="lx,-all" \
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--with-braille-driver="-tt,-vr,${brailleDrivers}" \
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--with-text-table="${textTable}" \
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--disable-speech-support --without-libbraille --without-curses --disable-x \
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--disable-pcm-support --disable-fm-support --disable-midi-support \
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--enable-standalone-programs --disable-api --disable-gpm --disable-icu
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make -s -C Programs all
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strip Programs/brltty
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make -s -C Programs install-programs install-data-files install-tables
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) || exit "${?}"
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"check_${initrdType}"
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(
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set -e
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cd "${brlttyInstallRoot}"
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cp --parents -- $(find . -type f -printf '%P ') "${initrdRoot}"
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) || exit 1
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"${invokeShell}" && (
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set +e
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trap "" 0
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cd "${temporaryDirectory}"
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"${SHELL:-/bin/sh}"
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exit 0
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)
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initrdMounted=false
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"unmount_${initrdType}" "${initrdRoot}" "${initrdImage}"
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gzip -c -9 "${initrdImage}" >"${initrdPath}"
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isoVolumeIdentifier="$(isoinfo -d -i "${originalImage}" | grep '^Volume id:' | cut -d' ' -f3-)"
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isoApplicationIdentifier="$(isoinfo -d -i "${originalImage}" | grep '^Application id:' | cut -d' ' -f3-)"
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mkisofs -quiet -J -R -T -boot-load-size 4 -boot-info-table -no-emul-boot \
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-A "${isoApplicationIdentifier}" -V "${isoVolumeIdentifier}" \
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-b "${loaderDirectory}/isolinux.bin" -c "${loaderDirectory}/boot.cat" \
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-o "${modifiedImage}" "${modifiedRoot}"
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exit 0
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