#!/usr/bin/env expect
############################################################################
# Purpose: Test of Slurm functionality
#          Validate scontrol change gres count with File is disabled.
#          If a GRES is associated with a File then we should not be able to
#          change it's count to anything other than zero as there is no
#          mechanism to identify the specific GRES to remove (i.e. say we
#          want to remove /dev/nvidia2 on a node with /dev/nvidia[0-3]).
#          We use gres/gpu for this test since those need to be associated
#          with specific device files.
############################################################################
# Copyright (C) 2019 SchedMD LLC
# Written by Morris Jette
#
# This file is part of Slurm, a resource management program.
# For details, see <https://slurm.schedmd.com/>.
# Please also read the included file: DISCLAIMER.
#
# Slurm is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 2 of the License, or (at your option)
# any later version.
#
# Slurm is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along
# with Slurm; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA.
############################################################################
source ./globals

set authorized     1
set exit_code      0
set file_in        "test$test_id.input"

if { ![test_super_user] } {
	skip "This test can't be run without being a super user of the cluster"
}

#
# Identify a node with gres/gpu to work with
#
make_bash_script $file_in "echo HOST:\$SLURMD_NODENAME"
set timeout $max_job_delay
set matches 0
set srun_pid [spawn $srun -n1 --gres=gpu:2 $file_in]
expect {
        -re "HOST:($re_word_str)" {
                incr matches
		set host_name $expect_out(1,string)
                exp_continue
        }
	timeout {
		log_error "srun not responding"
		slow_kill $srun_pid
		set exit_code 1
	}
	eof {
		wait
	}
}
exec $bin_rm -f $file_in
if {$matches != 1} {
	skip "This test can't be run without a node with at least 2 gres/gpu"
}

#
# Log current state for reference
#
set matches 0
spawn $scontrol show node $host_name
expect {
        -re "gpu:" {
                incr matches
                exp_continue
        }
	timeout {
		log_error "scontrol not responding"
		set exit_code 1
	}
	eof {
		wait
	}
}
if {$matches == 0} {
	fail "Something seems to be wrong with the state of node $host_name"
}

#
# Now try to change the count of gres/gpu to 1.  Note that a count of zero
# should work, but we want to see this request get rejected.
#
set matches 0
spawn $scontrol update NodeName=$host_name Gres=gpu:1
expect {
        -re "Invalid generic resource" {
            incr matches
			log_debug "Error is expected, no worries"
            exp_continue
        }
	timeout {
		log_error "scontrol not responding"
		set exit_code 1
	}
	eof {
		wait
	}
}
if {$matches != 1} {
	fail "Node GRES change request not rejected. Configuration of node $host_name is likely left in a bad state"
}

if {$exit_code != 0} {
	fail "Test failed due to previous errors (\$exit_code = $exit_code)"
}