#!/usr/bin/env bash
set -e

# start sshd server
_sshd_host() {
  if [ ! -d /var/run/sshd ]; then
    mkdir /var/run/sshd
    ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N ''
  fi
  /usr/sbin/sshd
}

# setup worker ssh to be passwordless
_ssh_worker() {
    if [[ ! -d /home/worker  ]]; then
        mkdir -p /home/worker
        chown -R worker:worker /home/worker
    fi
    cat > /home/worker/setup-worker-ssh.sh <<EOF2
   mkdir -p ~/.ssh
   chmod 0700 ~/.ssh
   ssh-keygen -b 2048 -t rsa -f ~/.ssh/id_rsa -q -N "" -C "$(whoami)@$(hostname)-$(date -I)"
   cat ~/.ssh/id_rsa.pub > ~/.ssh/authorized_keys
   chmod 0640 ~/.ssh/authorized_keys
   cat >> ~/.ssh/config <<EOF
Host *
StrictHostKeyChecking no
UserKnownHostsFile /dev/null
LogLevel QUIET
EOF2
    chmod 0644 ~/.ssh/config
    cd ~/
    tar -czvf ~/worker-secret.tar.gz .ssh
    cd -
    EOF2
    chmod +x /home/worker/setup-worker-ssh.sh
    chown worker: /home/worker/setup-worker-ssh.sh
    sudo -u worker /home/worker/setup-worker-ssh.sh
}

# start munge and generate key
_munge_start() {
    chown -R munge: /etc/munge /var/lib/munge /var/log/munge /var/run/munge
    chmod 0700 /etc/munge
    chmod 0711 /var/lib/munge
    chmod 0700 /var/log/munge
    chmod 0755 /var/run/munge
    /sbin/create-munge-key -f
    rngd -r /dev/urandom
    /usr/sbin/create-munge-key -r -f
    sh -c  "dd if=/dev/urandom bs=1 count=1024 > /etc/munge/munge.key"
    chown munge: /etc/munge/munge.key
    chmod 400 /etc/munge/munge.key
    sudo -u munge /sbin/munged
    munge -n
    munge -n | unmunge
    remunge
}

# copy secrets to /.secret directory for other nodes
_copy_secrets() {
  cp /home/worker/worker-secret.tar.gz /.secret/worker-secret.tar.gz
  cp /home/worker/setup-worker-ssh.sh /.secret/setup-worker-ssh.sh
  cp /etc/munge/munge.key /.secret/munge.key
  rm -f /home/worker/worker-secret.tar.gz
  rm -f /home/worker/setup-worker-ssh.sh
}

# generate slurm.conf
_generate_slurm_conf() {
  cat > /etc/slurm/slurm.conf <<EOF
#
# Example slurm.conf file. Please run configurator.html
# (in doc/html) to build a configuration file customized
# for your environment.
#
#
# slurm.conf file generated by configurator.html.
#
# See the slurm.conf man page for more information.
#
ClusterName=$CLUSTER_NAME
SlurmctldHost=$CONTROL_MACHINE
SlurmUser=slurm
SlurmctldPort=$SLURMCTLD_PORT
SlurmdPort=$SLURMD_PORT
AuthType=auth/munge
StateSaveLocation=/var/spool/slurm/ctld
SlurmdSpoolDir=/var/spool/slurm/d
SwitchType=switch/none
MpiDefault=none
SlurmctldPidFile=/var/run/slurmctld.pid
SlurmdPidFile=/var/run/slurmd.pid
ProctrackType=proctrack/pgid
ReturnToService=0
#
# TIMERS
SlurmctldTimeout=300
SlurmdTimeout=300
InactiveLimit=0
MinJobAge=300
KillWait=30
Waittime=0
#
# SCHEDULING
SchedulerType=sched/backfill
FastSchedule=1
#
# LOGGING
SlurmctldDebug=3
SlurmctldLogFile=/var/log/slurmctld.log
SlurmdDebug=3
SlurmdLogFile=/var/log/slurmd.log
JobCompType=jobcomp/none
#JobCompLoc=
#
# ACCOUNTING
JobAcctGatherType=jobacct_gather/linux
#JobAcctGatherFrequency=30
#
AccountingStorageType=accounting_storage/slurmdbd
AccountingStorageHost=$ACCOUNTING_STORAGE_HOST
AccountingStoragePort=$ACCOUNTING_STORAGE_PORT
#AccountingStorageLoc=
#AccountingStoragePass=
#AccountingStorageUser=
#
# COMPUTE NODES
NodeName=worker[01-02] RealMemory=1800 CPUs=1 State=UNKNOWN
PartitionName=$PARTITION_NAME Nodes=ALL Default=YES MaxTime=INFINITE State=UP
EOF
}

# run slurmctld
_slurmctld() {
    cd /root/rpmbuild/RPMS/aarch64
    yum -y --nogpgcheck localinstall slurm-22.05.6-1.el8.aarch64.rpm slurm-perlapi-22.05.6-1.el8.aarch64.rpm  slurm-slurmctld-22.05.6-1.el8.aarch64.rpm
    if $USE_SLURMDBD; then
        echo -n "checking for slurmdbd.conf"
        while [ ! -f /.secret/slurmdbd.conf ]; do
            echo -n "."
            sleep 1
        done
        echo ""
    fi
    mkdir -p /var/spool/slurm/ctld /var/spool/slurmd  /var/log/slurm /etc/slurm
    chown -R slurm: /var/spool/slurm/ctld /var/spool/slurmd  /var/log/slurm
    touch /var/log/slurmctld.log
    chown slurm: /var/log/slurmctld.log
    if [[ ! -f /home/config/slurm.conf ]]; then
        echo "### generate slurm.conf ###"
        _generate_slurm_conf
    else
        echo "### use provided slurm.conf ###"
        cp /home/config/slurm.conf /etc/slurm/slurm.conf
    fi
    sacctmgr -i add cluster "${CLUSTER_NAME}"
    sleep 2s
    /usr/sbin/slurmctld
    cp -f /etc/slurm/slurm.conf /.secret/
}

### main ###
_sshd_host
_ssh_worker
_munge_start
_copy_secrets
_slurmctld

tail -f /dev/null