222 lines
7.4 KiB
Bash
Executable File
222 lines
7.4 KiB
Bash
Executable File
#!/bin/bash
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#
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# CDM: The Console Display Manager
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#
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# Copyright (C) 2009-2012, Daniel J Griffiths <dgriffiths@ghost1227.com>
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# Thanks to:
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#
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# Andrwe beta-testing and submitting the fix for the all
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# important X incrementation function
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# brisbin33 code cleanup
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# tigrmesh finding a critical issue with the gnome-session handler
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# Profjim several incredibly useful patches
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# lambchops468 consolekit and hibernation patches
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# CasperVector Massive rearchitecturing and code sanitation
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#
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# This program 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 2 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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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301, USA.
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name=$(basename "$0")
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longname='Console Display Manager'
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ver='0.6'
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trap '' SIGINT SIGTSTP
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# Helper functions.
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warn() { (printf ' \033[01;33m*\033[00m '; echo "$name: $*") > /dev/stderr; }
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error() { (printf ' \033[01;31m*\033[00m '; echo "$name: $*") > /dev/stderr; }
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exitnormal() { exit 0; }
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exiterror() { sleep 1; exit 1; }
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yesno()
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{
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[ -z "$1" ] && return 1
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eval value=\$${1}
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case "$value" in
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[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1) return 0;;
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[Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0) return 1;;
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*) warn "invalid value for \`$1'; falling back to \`no' for now.";;
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esac
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}
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# Source cdm configurations.
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if [[ -n "$1" ]]; then
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if [[ -f "$1" ]]
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then
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source "$1"
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else
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error "config file \`$1' does not exist."
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exiterror
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fi
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elif [[ -f "$HOME/.cdmrc" ]]; then
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source "$HOME/.cdmrc"
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elif [[ -f /etc/cdmrc ]]; then
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source /etc/cdmrc
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fi
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# Default options.
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dialogrc=${dialogrc:-}
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countfrom=${countfrom:-0}
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display=${display:-0}
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xtty=${xtty:-7}
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locktty=${locktty:-no}
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consolekit=${consolekit:-yes}
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cktimeout=${cktimeout:-30}
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altstartx=${altstartx:-no}
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[[ -z "${binlist[*]}" ]] && binlist=()
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[[ -z "${namelist[*]}" ]] && namelist=()
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[[ -z "${flaglist[*]}" ]] && flaglist=()
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[[ -z "${serverargs[*]}" ]] && serverargs=(-nolisten tcp)
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# Offer all available sessions in /etc/X11/Sessions,
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# if $binlist if not explicitly set in cdmrc.
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if [[ "${#binlist[@]}" == 0 && -d /etc/X11/Sessions ]]; then
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binlist=($(find /etc/X11/Sessions -maxdepth 1 -type f))
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flaglist=($(sed 's/[[:digit:]]\+/X/g' <<< ${!binlist[@]}))
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namelist=(${binlist[@]##*/})
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fi
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# If $binlist is not set in cdmrc or by files in /etc/X11/Sessions,
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# try .desktop files in /usr/share/xsessions/ .
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if [[ "${#binlist[@]}" == 0 && -d /usr/share/xsessions ]]; then
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desktopsessions=($(find /usr/share/xsessions/ -regex .\*.desktop))
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#TODO: allow full quoting and expansion according to desktop entry spec:
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# http://standards.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#exec-variables
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for ((count=0; count < ${#desktopsessions[@]}; count++)); do
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# TryExec key is there to determine if executable is present,
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# but as we are going to test the Exec key anyway, we ignore it.
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execkey=$(sed -n -e 's/^Exec=//p' <${desktopsessions[${count}]})
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namekey=$(sed -n -e 's/^Name=//p' <${desktopsessions[${count}]})
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if [[ -n ${execkey} && -n ${namekey} ]]; then
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# The .desktop files allow there Exec keys to use $PATH lookup.
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binitem="$(which $(cut -f 1 -d ' ' <<< ${execkey}))"
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binargs="$(cut -s -f 2- -d ' ' <<< ${execkey})"
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# If which fails to return valid path, skip to next .desktop file.
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if [ -z $binitem ]; then continue; fi
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if [ -n $binargs ]; then binitem+=" ${binargs}"; fi
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binlist+=("${binitem}")
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flaglist+=('X')
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namelist+=("${namekey}")
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fi
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done
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fi
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case "${#binlist[@]}" in
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0)
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error "No programs found in cdm config file, /etc/X11/Sessions or /usr/share/xsessions."
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exiterror
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;;
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1)
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# No need to call dialog AND clear, only one possible program
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binindex=0
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;;
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*)
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menu=()
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for ((count = 0; count < ${#namelist[@]}; count++)); do
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menu=("${menu[@]}" "$((count+countfrom))" "${namelist[${count}]}")
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done
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binindex=$(
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DIALOGRC="$dialogrc" dialog --colors --stdout \
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--backtitle "$longname v$ver" --ok-label ' Select ' \
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--cancel-label ' Exit ' --menu 'Select session' 0 0 0 "${menu[@]}"
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)
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if [[ $? != 0 ]]; then
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clear; exitnormal
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fi
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clear
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let binindex-=countfrom
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;;
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esac
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# Run $bin according to its flag.
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bin=($(eval echo "${binlist[${binindex}]}"))
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case ${flaglist[$binindex]} in
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# *C*onsole programs.
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[Cc])
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# If $bin is a login shell, it might `exec' cdm again, causing an endless
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# loop. To solve this problem, export $CDM_SPAWN when `exec'ing $bin and
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# only let the shell automatically `exec' cdm when $CDM_SPAWN is not set.
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# See also the example shell profile file shipped with the cdm package.
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# Also untrap SIGINT and SIGTSTP before spawning process: If this is not
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# done, any child process of any child (bash) shell will completely
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# ignore SIGINT, which is rather confusing, and cannot be undone.
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trap - SIGINT SIGTSTP
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CDM_SPAWN=$$ exec "${bin[@]}"
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;;
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# *X* programs.
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[Xx])
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# If X is already running and locktty=yes, activate it.
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if $(yesno locktty) && xdpyinfo -display ":$display.0" &> /dev/null; then
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chvt "$((display+xtty))"
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exitnormal
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fi
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# Get the first empty display.
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display=0
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while ((display < 7)); do
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if dpyinfo=$(xdpyinfo -display ":$display.0" 2>&1 1>/dev/null) ||
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# Display is in use by another user.
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[[ "$dpyinfo" == 'No protocol specified'* ]] ||
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# Invalid MIT cookie.
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[[ "$dpyinfo" == 'Invalid MIT'* ]]
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then
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let display+=1
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else
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break
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fi
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done
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# Support for running X in current tty.
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if [[ $xtty == 'keep' ]]; then
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vt="$(tty)"
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if [[ "$vt" != '/dev/tty'* ]]; then
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error 'invalid TTY.'
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exiterror
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fi
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vt="${vt#/dev/tty}"
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else
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vt="$((xtty+display))"
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fi
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serverargs=(":${display}" "${serverargs[@]}" "vt$vt")
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$(yesno consolekit) && launchflags=(-c -t "$cktimeout")
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$(yesno altstartx) && launchflags=("${launchflags[@]}" --altstartx)
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if cdm-xlaunch "${launchflags[@]}" -- "${bin[@]}" -- "${serverargs[@]}"
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then
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exitnormal
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else
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warn "\`cdm-xlaunch' exited unsuccessfully."
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exiterror
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fi
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;;
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*)
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error "unknown flag: \`${flaglist[$binindex]}'."
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exiterror
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;;
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esac
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# vim:ts=4:sw=4:et
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