This file is indexed.

/usr/share/initramfs-tools/scripts/casper-bottom/25adduser is in casper 1.394.

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/sh

PREREQ=""
DESCRIPTION="Adding live session user..."

prereqs()
{
       echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
       prereqs
       exit 0
       ;;
esac

. /scripts/casper-functions
load_confmodule

log_begin_msg "$DESCRIPTION"

debconf_backup () {
    local question backup
    for question; do
	backup="$question-casper-backup"
	db_register debian-installer/dummy "$backup"
	db_get "$question"
	db_set "$backup" "$RET"
	db_fget "$question" seen
	db_fset "$backup" seen "$RET"
    done
}

debconf_restore () {
    local question backup
    for question; do
	backup="$question-casper-backup"
	db_get "$backup"
	db_set "$question" "$RET"
	db_fget "$backup" seen
	db_fset "$question" seen "$RET"
	db_unregister "$backup"
    done
}

debconf_backup \
    passwd/root-password-crypted \
    passwd/root-password passwd/root-password-again \
    passwd/user-password-crypted \
    passwd/user-password passwd/user-password-again \
    passwd/user-fullname passwd/username passwd/user-uid

# U6aMy0wojraho is just a blank password
db_set passwd/root-password-crypted '*'
db_set passwd/user-password-crypted U6aMy0wojraho
db_set passwd/user-fullname "$USERFULLNAME"
db_set passwd/username "$USERNAME"
db_set passwd/user-uid 999

chroot /root /usr/lib/user-setup/user-setup-apply > /dev/null

# Clear out debconf database again to avoid confusing ubiquity later.
debconf_restore \
    passwd/root-password-crypted \
    passwd/root-password passwd/root-password-again \
    passwd/user-password-crypted \
    passwd/user-password passwd/user-password-again \
    passwd/user-fullname passwd/username passwd/user-uid

if [ -d /root/etc/sudoers.d/ ]; then
    echo "${USERNAME}  ALL=(ALL) NOPASSWD: ALL" > /root/etc/sudoers.d/casper
fi

LTS="$(cut -d' ' -f3 /root/cdrom/.disk/info 2>/dev/null)" || LTS=
RELEASE="$(cut -d' ' -f1-2 /root/cdrom/.disk/info 2>/dev/null | sed 's/-/ /')" || RELEASE=
if [ "$LTS" = "LTS" ] && [ -n "$RELEASE" ]; then
	RELEASE="$RELEASE LTS"
fi
for file in /usr/share/applications/ubiquity.desktop /usr/share/applications/kde4/ubiquity-kdeui.desktop; do
    if [ -f "/root/$file" ]; then
        sed -i "s/RELEASE/$RELEASE/" "/root$file"
        chroot /root install -d -o $USERNAME -g $USERNAME /home/$USERNAME/Desktop
        chroot /root install -D -o $USERNAME -g $USERNAME $file /home/$USERNAME/Desktop/$(basename "$file")
        if [ -x "/root/usr/bin/dbus-run-session" ] && [ -x "/root/usr/bin/gio" ]; then
            chroot /root sudo -i -u $USERNAME dbus-run-session -- gio set /home/$USERNAME/Desktop/$(basename "$file") metadata::trusted true
        fi
        break
    fi
done

#GDM
if [ -d /root/etc/gdm3 ]; then
    sed -i '/^[UG]ID_MIN/s/\<1000$/ 999/' /root/etc/login.defs

    #inject a systemd unit to update AccountsService properties during boot
    if [ -z "${PERSISTENT}" ]; then
        cat > /root/lib/systemd/system/passwd-del.service << EOF
[Unit]
Description=Run passwd -d to ensure AccountsService properties are set correctly
After=accounts-daemon.service
Before=display-manager.service

[Service]
ExecStart=-/usr/bin/dbus-run-session passwd -d $USERNAME
Type=oneshot
EOF
        ln -s /lib/systemd/system/passwd-del.service \
              /root/etc/systemd/system/display-manager.service.wants/
    fi
fi

# Kubuntu
if [ -f "/root/usr/bin/plasma-desktop" ]; then
    if [ -f "/root/usr/share/kde4/apps/khelpcenter/plugins/kubuntu/a_welcome.desktop" ]; then
      chroot /root install -d -o $USERNAME -g $USERNAME /home/$USERNAME/Desktop
      chroot /root install -D -o $USERNAME -g $USERNAME /usr/share/kde4/apps/khelpcenter/plugins/kubuntu/a_welcome.desktop /home/$USERNAME/Desktop/a_welcome.desktop
    fi
fi

#Kubuntu Plasma 5, turn on folderview
if [ -f "/root/usr/bin/plasmashell" ]; then
    if [ -f "/root/usr/share/kubuntu-default-settings/layout.js" ]; then
      chroot /root install -D -o $USERNAME -g $USERNAME /usr/share/kubuntu-default-settings/layout.js /usr/share/plasma/shells/org.kde.plasma.desktop/contents/layout.js
    fi
fi

# Kubuntu Netbook
if [ -f "/root/usr/bin/plasma-netbook" ]; then
    config="/root/usr/share/kubuntu-netbook-default-settings/share/apps/plasma/layout-templates/org.kde.plasma-netbook.defaultSal/contents/layout.js"
    escaped_desktop="\/usr\/share\/applications\/kde4\/ubiquity-kdeui.desktop"
    if [ -f $config ]; then
      sed -i "s/\/\/__UBIQUITY_PLACEHOLDER__\/\//\"$escaped_desktop\"/" $config
    fi
fi

#Ubuntu MID wants to be installed with --automatic
if [ -f "/root/usr/share/ubuntu-mid-default-settings/mid-gui-start" ]; then
  if [ -f "/root/usr/share/applications/ubiquity.desktop" ]; then
    sed -i 's/--desktop/--automatic --desktop/' "/root/usr/share/applications/ubiquity.desktop"
  fi
fi

#Ubuntu MID uses kourou, and the ubiquity icon should be easy to find
if [ -f "/root/usr/lib/hildon-desktop/kourou.py" ]; then
  if [ -f "/root/etc/xdg/menus/home.menu" ]; then
    sed -i '/<\/Include>/i\		<Filename>ubiquity.desktop</Filename>' "/root/etc/xdg/menus/home.menu"
  fi
fi

log_end_msg