#!/bin/bash -x

set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR

if [[ $EUID != 0 ]]; then
    echo "$0: error: expected to be root."
    exit 1
fi

TPW=/q/root/shadow/traci-simple
if ifclass tp; then
    ROOTPW="$TPW"
else
    ROOTPW=/q/root/shadow/standard
fi

chpw() {
    # generating a hashed password:
    # under debian, you can do
    # mkpasswd -m sha-512 -s >/q/root/shadow/standard
    # On arch, best seems to be copy your shadow file to a temp location,
    # then passwd, get out the new pass, then copy the shadow file back.

    user=$1
    pwfile=$2
    if [[ $pwfile && -e $pwfile ]]; then
        printf "$user:" | cat - "$pwfile" | $ROOTCMD chpasswd -e
    else
        echo "$0: warning: no pw set for $user" >&2
    fi
}
au() {
    if ! $ROOTCMD getent passwd $1; then
        $ROOTCMD useradd -m -s /bin/bash $1 || [[ $? == 9 ]]
    fi
}

chpw root "$ROOTPW"
# 9 = user already exists. so we are idempotent.
au ian
chpw ian "$ROOTPW"

au traci
if ifclass frodo; then
    chpw traci "$TPW"
fi
# comparing ian's groups to traci, I see none she should join on arch
$ROOTCMD usermod -a -G traci ian


# based on unison error, with 8192 from
# sysctl -a | grep fs.inotify.max_user_watches
#http://stackoverflow.com/questions/535768/what-is-a-reasonable-amount-of-inotify-watches-with-linux

f=$target/etc/sysctl.d/99-sysctl.conf
key=fs.inotify.max_user_watches
if [[ -e $f ]]; then sed -ri --follow-symlinks "/^\s*$key\s*=/d" $f; fi
echo "fs.inotify.max_user_watches = 1000000" >> $f
# applies it. it would be also be applied after a reboot
$ROOTCMD sysctl --system

f=$target/etc/sudoers
line='ian  ALL=(ALL)  NOPASSWD: ALL'
if [[ ! -e $f ]] || ! grep -xF "$line" $f; then
    echo "$line" >> $f
fi


dir=/p/c/machine_specific/$HOSTNAME/.unison
$ROOTCMD mkdir -p $dir
if ! $ROOTCMD test -L /root/.unison; then
    $ROOTCMD rm -rf /root/.unison
    $ROOTCMD ln -s -T $dir /root/.unison
fi

$ROOTCMD chown -R 1000:1000 $dir
while true; do
    $ROOTCMD chown 1000:1000 $dir
    $ROOTCMD chmod 700 $dir
    dir=$(dirname $dir)
    if [[ $dir == /p ]]; then break; fi
done