This file is indexed.

/usr/sbin/lightdm-session is in lightdm 1.18.1-0ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/bash
#
# LightDM wrapper to run around X sessions.

echo "Running X session wrapper"

message () {
  # pretty-print messages of arbitrary length; use xmessage if it
  # is available and $DISPLAY is set
  MESSAGE="$PROGNAME: $*"
  echo "$MESSAGE" | fold -s -w ${COLUMNS:-80} >&2
  if [ -n "$DISPLAY" ] && which xmessage > /dev/null 2>&1; then
    echo "$MESSAGE" | fold -s -w ${COLUMNS:-80} | xmessage -center -file -
  fi
}

errormsg () {
  # exit script with error
  message "$*"
  exit 1
}

# temporary storage of error messages
ERR=$(mktemp --tmpdir config-err-XXXXXX)

source_with_error_check () {
    CONFIG_FILE="$1"
    echo "Loading $CONFIG_FILE"
    BASH_VERSION= . "$CONFIG_FILE" 2>"$ERR"
    if [ -s "$ERR" ]; then
        . /usr/lib/lightdm/config-error-dialog.sh
    fi
    cat "$ERR" >>/dev/stderr
    truncate -s 0 "$ERR"
}

# Load profile
for file in "/etc/profile" "$HOME/.profile" "/etc/xprofile" "$HOME/.xprofile"; do
    if [ -f "$file" ]; then
        source_with_error_check "$file"
    fi
done

# Load resources
if type xrdb >/dev/null 2>&1; then
    xresourcedir="/etc/X11/Xresources"
    if [ -d "$xresourcedir" ]; then
        for file in $xresourcedir/*; do
            echo "Loading resource: $file"
            xrdb -merge "$file"
        done
    fi
    xresourcefile="$HOME/.Xresources"
    if [ -f "$xresourcefile" ]; then
        echo "Loading resource: $xresourcefile"
        xrdb -merge "$xresourcefile"
    fi
fi

# Load keymaps
if type setxkbmap >/dev/null 2>&1; then
    for file in "/etc/X11/Xkbmap" "$HOME/.Xkbmap"; do
        if [ -f "$file" ]; then
            echo "Loading keymap: $file"
            setxkbmap `cat "$file"`
            XKB_IN_USE=yes
        fi
    done
fi

# Load xmodmap if not using XKB
if type xmodmap >/dev/null 2>&1; then
    if [ -z "$XKB_IN_USE" ]; then
        for file in "/etc/X11/Xmodmap" "$HOME/.Xmodmap"; do
            if [ -f "$file" ]; then
               echo "Loading modmap: $file"
               xmodmap "$file"
            fi
        done
    fi
fi

unset XKB_IN_USE

# Run all system xinitrc shell scripts.
xinitdir="/etc/X11/xinit/xinitrc.d"
if [ -d "$xinitdir" ]; then
    for script in $xinitdir/*; do
        echo "Loading xinit script $script"
        if [ -x "$script" -a ! -d "$script" ]; then
            . "$script"
        fi
    done
fi

# Load Xsession scripts
# OPTIONFILE, USERXSESSION, USERXSESSIONRC and ALTUSERXSESSION are required
# by the scripts to work
xsessionddir="/etc/X11/Xsession.d"
OPTIONFILE=/etc/X11/Xsession.options
USERXSESSION=$HOME/.xsession
USERXSESSIONRC=$HOME/.xsessionrc
ALTUSERXSESSION=$HOME/.Xsession

if [ -d "$xsessionddir" ]; then
    for i in `ls $xsessionddir`; do
        script="$xsessionddir/$i"
        echo "Loading X session script $script"
        if [ -r "$script"  -a -f "$script" ] && expr "$i" : '^[[:alnum:]_-]\+$' > /dev/null; then
            . "$script"
        fi
    done
fi

echo "X session wrapper complete, running session $@"

exec $@