Xlsh - eXtended Login Shell

Question

Hello!
I'm new to Arch bbs, though I've been using Arch for quite some time now. So well... hi everyone!
Recently I wrote a small program for myself and I feel that more people could benefit from it - so I'm sharing.
xlsh is a simple login shell with readline functionality and PAM integration.
When run stand-alone on a virtual console it can replace the standard "login" program.
When run in cooperation with X daemon component (xlshd) it can replace XDM/GDM/KDM.
Features:
Small and simple, written entirely in C.
Easily hackable because of compact codebase (~1000 source lines).
Uses PAM for authorization and session management.
Ability to select non-default shell/window manager during logon.
Entirely keyboard driven display manager replacement (when used with xlshd) without the need for any fat libraries or GUI toolkits.
Defaults configured before compilation, some of them can be changed by setting few environment variables.
Single shell script file (/etc/xlsh/xlshrc) for customizing how xlshd launches xlsh.
Introduces a concept of "pre-login shell" known from GNU/HURD.
Only three important commands: 'login', 'reboot' and 'shutdown'.
New commands can be easily added (if you need any) by editing xlsh.c
Username autocompletion on TAB.
Zenburn color scheme by default (when run under X).
So that's it. I grew tired of xdm/gdm/kdm so I rolled out my own solution. I currently run it on all my ttys and as X login manager. Shell-like keyboard only interaction is very comfortable and simple Zenburn colorscheme fits very well into my Awesome WM look & feel (which is also Zenburn).
AUR package (xlsh-git): http://aur.archlinux.org/packages.php?ID=53520
Source code: https://github.com/Nadrin/xlsh
Project wiki: https://github.com/Nadrin/xlsh/wiki
Screenshot: https://github.com/Nadrin/xlsh/wiki/Screenshots
Let me know if you find it useful. Bug reports, suggestions and any other form of constructive criticism is very much welcome!

Answer 1

env (xlsh)
LCLIMPORTDIR=/usr/share/splint/imports
XDG_DATA_HOME=/home/irtigor/.local/share
TERM=rxvt-unicode-256color
SHELL=/bin/zsh
XDG_SESSION_COOKIE=8c19aa75e1df23394088ae2f00001baa-1320498024.774424-1546763611
GTK2_RC_FILES=/home/irtigor/.gtkrc-2.0
LC_NUMERIC=
ANT_HOME=/usr/share/java/apache-ant
USER=irtigor
LARCH_PATH=/usr/share/splint/lib
MOZ_PLUGIN_PATH=/usr/lib/mozilla/plugins
XDG_CONFIG_DIRS=/etc/xdg:/etc/xdg
PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/share/java/apache-ant/bin:/usr/bin/vendor_perl:/usr/bin/core_perl:/home/irtigor/.rvm/bin
LC_MESSAGES=
HG=/usr/bin/hg
_=/usr/bin/env
LC_COLLATE=
PWD=/home/irtigor
JAVA_HOME=/usr/lib/jvm/java-6-openjdk
LANG=en_US.UTF-8
SHLVL=3
HOME=/home/irtigor
XDG_CONFIG_HOME=/home/irtigor/.config
XDG_CACHE_HOME=/home/irtigor/.cache
LOGNAME=irtigor
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-JT1g91p7nx,guid=9befacf8c90efc2782fc6ccf0000001c
XDG_DATA_DIRS=/usr/share/:/usr/local/share/:/usr/share/:/usr/local/share/
J2SDKDIR=/usr/lib/jvm/java-6-openjdk
LC_CTYPE=en_US.UTF-8
DISPLAY=:0
J2REDIR=/usr/lib/jvm/java-6-openjdk/jre
LC_TIME=
G_BROKEN_FILENAMES=1
WINDOWID=10485770
COLORFGBG=default;default;0
TERMINFO=/usr/share/terminfo
COLORTERM=yes
OLDPWD=/home/irtigor
AUTOJUMP_DATA_DIR=/home/irtigor/.local/share/autojump
EDITOR=vim
PAGER=less
MAIL=/var/mail/irtigor
LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lz=01;31:*.xz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.axv=01;35:*.anx=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.axa=00;36:*.oga=00;36:*.spx=00;36:*.xspf=00;36:
LESS_TERMCAP_mb=[01;31m
LESS_TERMCAP_md=[01;31m
LESS_TERMCAP_me=[0m
LESS_TERMCAP_se=[0m
LESS_TERMCAP_so=[01;44;33m
LESS_TERMCAP_ue=[0m
LESS_TERMCAP_us=[01;32m
BROWSER=firefox
DISABLE_AUTO_UPDATE=true
GREP_OPTIONS=--color=auto
GREP_COLOR=1;32
LSCOLORS=Gxfxcxdxbxegedabagacad
ck-list-sessions (xlsh)
Session1:
unix-user = '1000'
realname = '(null)'
seat = 'Seat2'
session-type = ''
active = FALSE
x11-display = ':0'
x11-display-device = '/dev/tty3'
display-device = ''
remote-host-name = ''
is-local = FALSE
on-since = '2011-11-05T12:39:44.074206Z'
login-session-id = '4294967295'
env (slim)
LCLIMPORTDIR=/usr/share/splint/imports
XDG_DATA_HOME=/home/irtigor/.local/share
SHELL=/bin/zsh
TERM=rxvt-unicode-256color
XDG_SESSION_COOKIE=8c19aa75e1df23394088ae2f00001baa-1320498147.998816-1602302550
GTK2_RC_FILES=/home/irtigor/.gtkrc-2.0
LC_NUMERIC=
ANT_HOME=/usr/share/java/apache-ant
USER=irtigor
LARCH_PATH=/usr/share/splint/lib
MOZ_PLUGIN_PATH=/usr/lib/mozilla/plugins
XDG_CONFIG_DIRS=/etc/xdg:/etc/xdg
MAIL=/var/mail/irtigor
PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/usr/share/java/apache-ant/bin:/usr/bin/vendor_perl:/usr/bin/core_perl:/home/irtigor/.rvm/bin
LC_MESSAGES=
HG=/usr/bin/hg
_=/usr/bin/env
LC_COLLATE=
PWD=/home/irtigor
JAVA_HOME=/usr/lib/jvm/java-6-openjdk
EDITOR=vim
LANG=en_US.UTF-8
SHLVL=2
HOME=/home/irtigor
XDG_CONFIG_HOME=/home/irtigor/.config
XDG_CACHE_HOME=/home/irtigor/.cache
LOGNAME=irtigor
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-Ya5luICcfh,guid=74c155d555aa8c9aa358c87100000014
XDG_DATA_DIRS=/usr/share/:/usr/local/share/:/usr/share/:/usr/local/share/
J2SDKDIR=/usr/lib/jvm/java-6-openjdk
LC_CTYPE=en_US.UTF-8
DISPLAY=:0.0
J2REDIR=/usr/lib/jvm/java-6-openjdk/jre
LC_TIME=
G_BROKEN_FILENAMES=1
XAUTHORITY=/home/irtigor/.Xauthority
WINDOWID=12582922
COLORFGBG=default;default;0
TERMINFO=/usr/share/terminfo
COLORTERM=yes
OLDPWD=/home/irtigor
AUTOJUMP_DATA_DIR=/home/irtigor/.local/share/autojump
PAGER=less
LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lz=01;31:*.xz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.axv=01;35:*.anx=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=00;36:*.au=00;36:*.flac=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.axa=00;36:*.oga=00;36:*.spx=00;36:*.xspf=00;36:
LESS_TERMCAP_mb=[01;31m
LESS_TERMCAP_md=[01;31m
LESS_TERMCAP_me=[0m
LESS_TERMCAP_se=[0m
LESS_TERMCAP_so=[01;44;33m
LESS_TERMCAP_ue=[0m
LESS_TERMCAP_us=[01;32m
BROWSER=firefox
DISABLE_AUTO_UPDATE=true
GREP_OPTIONS=--color=auto
GREP_COLOR=1;32
LSCOLORS=Gxfxcxdxbxegedabagacad
ck-list-sessions (slim)
Session2:
unix-user = '1000'
realname = '(null)'
seat = 'Seat1'
session-type = ''
active = TRUE
x11-display = ':0.0'
x11-display-device = '/dev/tty3'
display-device = ''
remote-host-name = ''
is-local = TRUE
on-since = '2011-11-05T12:46:37.963456Z'
login-session-id = '1'
Session1:
unix-user = '1000'
realname = '(null)'
seat = 'Seat2'
session-type = ''
active = FALSE
x11-display = ':0.0'
x11-display-device = ''
display-device = ''
remote-host-name = ''
is-local = TRUE
on-since = '2011-11-05T12:46:33.690874Z'
login-session-id = '1'