scrun(1)

NAME
scrun - an OCI runtime proxy for Slurm.

SYNOPSIS

Create Operation
scrun [GLOBAL OPTIONS...] create [CREATE OPTIONS] <container-id>

    Prepares a new container with container-id in current working directory.

Start Operation
scrun [GLOBAL OPTIONS...] start <container-id>

    Request to start and run container in job.

Query State Operation
scrun [GLOBAL OPTIONS...] state <container-id>

    Output OCI defined JSON state of container.

Kill Operation
scrun [GLOBAL OPTIONS...] kill <container-id> [signal]

    Send signal (default: SIGTERM) to container.

Delete Operation
scrun [GLOBAL OPTIONS...] delete [DELETE OPTIONS] <container-id>

    Release any resources held by container locally and remotely.
Perform OCI runtime operations against container-id per:
https://github.com/opencontainers/runtime-spec/blob/main/runtime.md scrun attempts to mimic the commandline behavior as closely as possible to crun and runc in order to maintain in place replacement compatibility with DOCKER and podman. All commandline arguments for crun and runc will be accepted for compatibility but may be ignored depending on their applicability.

DESCRIPTION
scrun is an OCI runtime proxy for Slurm. It acts as a common interface to DOCKER or podman to allow container operations to be executed under Slurm as jobs. scrun will accept all commands as an OCI compliant runtime but will proxy the container and all STDIO to Slurm for scheduling and execution. The containers will be executed remotely on Slurm compute nodes according to settings in oci.conf(5). scrun requires all containers to be OCI image compliant per:
https://github.com/opencontainers/image-spec/blob/main/spec.md

RETURN VALUE
On successful operation, scrun will return 0. For any other condition scrun will return any non-zero number to denote a error.

GLOBAL OPTIONS

--cgroup-manager
    Ignored.

--debug
    Activate debug level logging.

-f <slurm_conf_path>
    Use specified slurm.conf for configuration.
    Default: sysconfdir from configure during compilation

--usage
    Show quick help on how to call scrun

--log-format=<json|text>
    Optional select format for logging. May be "json" or "text".
    Default: text

--root=<root_path>
    Path to spool directory to communication sockets and temporary directories and files. This should be a tmpfs and should be cleared on reboot.
    Default: /run/user/{user_id}/scrun/

--rootless
    Ignored. All scrun commands are always rootless.

--systemd-cgroup
    Ignored.

-v  Increase logging verbosity. Multiple -v's increase verbosity.

-V, --version
    Print version information and exit.

CREATE OPTIONS

-b <bundle_path>, --bundle=<bundle_path>
    Path to the root of the bundle directory.
    Default: caller's working directory

--console-socket=<console_socket_path>
    Optional path to an AF_UNIX socket which will receive a file descriptor referencing the master end of the console's pseudoterminal.
    Default: ignored

--no-pivot
    Ignored.

--no-new-keyring
    Ignored.

--pid-file=<pid_file_path>
    Specify the file to lock and populate with process ID.
    Default: ignored

--preserve-fds
    Ignored.

DELETE OPTIONS

--force
    Ignored. All delete requests are forced and will kill any running jobs.

INPUT ENVIRONMENT VARIABLES

SCRUN_DEBUG=<quiet|fatal|error|info|verbose|debug|debug2|debug3|debug4|debug5>
    Set logging level.

SCRUN_STDERR_DEBUG=<quiet|fatal|error|info|verbose|debug|debug2|debug3|debug4|debug5>
    Set logging level for standard error output only.

SCRUN_SYSLOG_DEBUG=<quiet|fatal|error|info|verbose|debug|debug2|debug3|debug4|debug5>
    Set logging level for syslogging only.

SCRUN_FILE_DEBUG=<quiet|fatal|error|info|verbose|debug|debug2|debug3|debug4|debug5>
    Set logging level for log file only.

JOB INPUT ENVIRONMENT VARIABLES

SCRUN_ACCOUNT
    See SLURM_ACCOUNT from srun(1).

SCRUN_ACCTG_FREQ
    See SLURM_ACCTG_FREQ from srun(1).

SCRUN_BURST_BUFFER
    See SLURM_BURST_BUFFER from srun(1).

SCRUN_CLUSTER_CONSTRAINT
    See SLURM_CLUSTER_CONSTRAINT from srun(1).

SCRUN_CLUSTERS
    See SLURM_CLUSTERS from srun(1).

SCRUN_CONSTRAINT
    See SLURM_CONSTRAINT from srun(1).

SLURM_CORE_SPEC
    See SLURM_ACCOUNT from srun(1).

SCRUN_CPU_BIND
    See SLURM_CPU_BIND from srun(1).

SCRUN_CPU_FREQ_REQ
    See SLURM_CPU_FREQ_REQ from srun(1).

SCRUN_CPUS_PER_GPU
    See SLURM_CPUS_PER_GPU from srun(1).

SCRUN_CPUS_PER_TASK
    See SRUN_CPUS_PER_TASK from srun(1).

SCRUN_DELAY_BOOT
    See SLURM_DELAY_BOOT from srun(1).

SCRUN_DEPENDENCY
    See SLURM_DEPENDENCY from srun(1).

SCRUN_DISTRIBUTION
    See SLURM_DISTRIBUTION from srun(1).

SCRUN_EPILOG
    See SLURM_EPILOG from srun(1).

SCRUN_EXACT
    See SLURM_EXACT from srun(1).

SCRUN_EXCLUSIVE
    See SLURM_EXCLUSIVE from srun(1).

SCRUN_GPU_BIND
    See SLURM_GPU_BIND from srun(1).

SCRUN_GPU_FREQ
    See SLURM_GPU_FREQ from srun(1).

SCRUN_GPUS
    See SLURM_GPUS from srun(1).

SCRUN_GPUS_PER_NODE
    See SLURM_GPUS_PER_NODE from srun(1).

SCRUN_GPUS_PER_SOCKET
    See SLURM_GPUS_PER_SOCKET from salloc(1).

SCRUN_GPUS_PER_TASK
    See SLURM_GPUS_PER_TASK from srun(1).

SCRUN_GRES_FLAGS
    See SLURM_GRES_FLAGS from srun(1).

SCRUN_GRES
    See SLURM_GRES from srun(1).

SCRUN_HINT
    See SLURM_HIST from srun(1).

SCRUN_JOB_NAME
    See SLURM_JOB_NAME from srun(1).

SCRUN_JOB_NODELIST
    See SLURM_JOB_NODELIST from srun(1).

SCRUN_JOB_NUM_NODES
    See SLURM_JOB_NUM_NODES from srun(1).

SCRUN_LABELIO
    See SLURM_LABELIO from srun(1).

SCRUN_MEM_BIND
    See SLURM_MEM_BIND from srun(1).

SCRUN_MEM_PER_CPU
    See SLURM_MEM_PER_CPU from srun(1).

SCRUN_MEM_PER_GPU
    See SLURM_MEM_PER_GPU from srun(1).

SCRUN_MEM_PER_NODE
    See SLURM_MEM_PER_NODE from srun(1).

SCRUN_MPI_TYPE
    See SLURM_MPI_TYPE from srun(1).

SCRUN_NCORES_PER_SOCKET
    See SLURM_NCORES_PER_SOCKET from srun(1).

SCRUN_NETWORK
    See SLURM_NETWORK from srun(1).

SCRUN_NSOCKETS_PER_NODE
    See SLURM_NSOCKETS_PER_NODE from srun(1).

SCRUN_NTASKS
    See SLURM_NTASKS from srun(1).

SCRUN_NTASKS_PER_CORE
    See SLURM_NTASKS_PER_CORE from srun(1).

SCRUN_NTASKS_PER_GPU
    See SLURM_NTASKS_PER_GPU from srun(1).

SCRUN_NTASKS_PER_NODE
    See SLURM_NTASKS_PER_NODE from srun(1).

SCRUN_NTASKS_PER_TRES
    See SLURM_NTASKS_PER_TRES from srun(1).

SCRUN_OPEN_MODE
    See SLURM_MODE from srun(1).

SCRUN_OVERCOMMIT
    See SLURM_OVERCOMMIT from srun(1).

SCRUN_OVERLAP
    See SLURM_OVERLAP from srun(1).

SCRUN_PARTITION
    See SLURM_PARTITION from srun(1).

SCRUN_POWER
    See SLURM_POWER from srun(1).

SCRUN_PROFILE
    See SLURM_PROFILE from srun(1).

SCRUN_PROLOG
    See SLURM_PROLOG from srun(1).

SCRUN_QOS
    See SLURM_QOS from srun(1).

SCRUN_REMOTE_CWD
    See SLURM_REMOTE_CWD from srun(1).

SCRUN_REQ_SWITCH
    See SLURM_REQ_SWITCH from srun(1).

SCRUN_RESERVATION
    See SLURM_RESERVATION from srun(1).

SCRUN_SIGNAL
    See SLURM_SIGNAL from srun(1).

SCRUN_SLURMD_DEBUG
    See SLURMD_DEBUG from srun(1).

SCRUN_SPREAD_JOB
    See SLURM_SPREAD_JOB from srun(1).

SCRUN_TASK_EPILOG
    See SLURM_TASK_EPILOG from srun(1).

SCRUN_TASK_PROLOG
    See SLURM_TASK_PROLOG from srun(1).

SCRUN_THREAD_SPEC
    See SLURM_THREAD_SPEC from srun(1).

SCRUN_THREADS_PER_CORE
    See SLURM_THREADS_PER_CORE from srun(1).

SCRUN_THREADS
    See SLURM_THREADS from srun(1).

SCRUN_TIMELIMIT
    See SLURM_TIMELIMIT from srun(1).

SCRUN_TRES_BIND
    Same as --tres-bind

SCRUN_TRES_PER_TASK
    See SLURM_TRES_PER_TASK from srun(1).

SCRUN_UNBUFFEREDIO
    See SLURM_UNBUFFEREDIO from srun(1).

SCRUN_USE_MIN_NODES
    See SLURM_USE_MIN_NODES from srun(1).

SCRUN_WAIT4SWITCH
    See SLURM_WAIT4SWITCH from srun(1).

SCRUN_WCKEY
    See SLURM_WCKEY from srun(1).

SCRUN_WORKING_DIR
    See SLURM_WORKING_DIR from srun(1).

OUTPUT ENVIRONMENT VARIABLES

SCRUN_OCI_VERSION
    Advertised version of OCI compliance of container.

SCRUN_CONTAINER_ID
    Value based as container_id during create operation.

SCRUN_PID
    PID of process used to monitor and control container on allocation node.

SCRUN_BUNDLE
    Path to container bundle directory.

SCRUN_SUBMISSION_BUNDLE
    Path to container bundle directory before modification by Lua script.

SCRUN_ANNOTATION_*
    List of annotations from container's config.json.

SCRUN_PID_FILE
    Path to pid file that is locked and populated with PID of scrun.

SCRUN_SOCKET
    Path to control socket for scrun.

SCRUN_SPOOL_DIR
    Path to workspace for all temporary files for current container. Purged by deletion operation.

SCRUN_SUBMISSION_CONFIG_FILE
    Path to container's config.json file at time of submission.

SCRUN_USER
    Name of user that called create operation.

SCRUN_USER_ID
    Numeric ID of user that called create operation.

SCRUN_GROUP
    Name of user's primary group that called create operation.

SCRUN_GROUP_ID
    Numeric ID of user primary group that called create operation.

SCRUN_ROOT
    See --root.

SCRUN_ROOTFS_PATH
    Path to container's root directory.

SCRUN_SUBMISSION_ROOTFS_PATH
    Path to container's root directory at submission time.

SCRUN_LOG_FILE
    Path to scrun's log file during create operation.

SCRUN_LOG_FORMAT
    Log format type during create operation.

JOB OUTPUT ENVIRONMENT VARIABLES

SLURM_*_HET_GROUP_#
    For a heterogeneous job allocation, the environment variables are set separately for each component.

SLURM_CLUSTER_NAME
    Name of the cluster on which the job is executing.

SLURM_CONTAINER
    OCI Bundle for job.

SLURM_CONTAINER_ID
    OCI id for job.

SLURM_CPUS_PER_GPU
    Number of CPUs requested per allocated GPU.

SLURM_CPUS_PER_TASK
    Number of CPUs requested per task.

SLURM_DIST_PLANESIZE
    Plane distribution size. Only set for plane distributions.

SLURM_DISTRIBUTION
    Distribution type for the allocated jobs.

SLURM_GPU_BIND
    Requested binding of tasks to GPU.

SLURM_GPU_FREQ
    Requested GPU frequency.

SLURM_GPUS
    Number of GPUs requested.

SLURM_GPUS_PER_NODE
    Requested GPU count per allocated node.

SLURM_GPUS_PER_SOCKET
    Requested GPU count per allocated socket.

SLURM_GPUS_PER_TASK
    Requested GPU count per allocated task.

SLURM_HET_SIZE
    Set to count of components in heterogeneous job.

SLURM_JOB_ACCOUNT
    Account name associated of the job allocation.

SLURM_JOB_CPUS_PER_NODE
    Count of CPUs available to the job on the nodes in the allocation, using the format CPU_count[(xnumber_of_nodes)][,CPU_count [(xnumber_of_nodes)] ...]. For example: SLURM_JOB_CPUS_PER_NODE='72(x2),36' indicates that on the first and second nodes (as listed by SLURM_JOB_NODELIST) the allocation has 72 CPUs, while the third node has 36 CPUs. NOTE: The select/linear plugin allocates entire nodes to jobs, so the value indicates the total count of CPUs on allocated nodes. The select/cons_tres plugin allocates individual CPUs to jobs, so this number indicates the number of CPUs allocated to the job.

SLURM_JOB_END_TIME
    The UNIX timestamp for a job's projected end time.

SLURM_JOB_GPUS
    The global GPU IDs of the GPUs allocated to this job. The GPU IDs are not relative to any device cgroup, even if devices are constrained with task/cgroup. Only set in batch and interactive jobs.

SLURM_JOB_ID
    The ID of the job allocation.

SLURM_JOB_NODELIST
    List of nodes allocated to the job.

SLURM_JOB_NUM_NODES
    Total number of nodes in the job allocation.

SLURM_JOB_PARTITION
    Name of the partition in which the job is running.

SLURM_JOB_QOS
    Quality Of Service (QOS) of the job allocation.

SLURM_JOB_RESERVATION
    Advanced reservation containing the job allocation, if any.

SLURM_JOB_START_TIME
    UNIX timestamp for a job's start time.

SLURM_MEM_BIND
    Bind tasks to memory.

SLURM_MEM_BIND_LIST
    Set to bit mask used for memory binding.

SLURM_MEM_BIND_PREFER
    Set to "prefer" if the SLURM_MEM_BIND option includes the prefer option.

SLURM_MEM_BIND_SORT
    Sort free cache pages (run zonesort on Intel KNL nodes)

SLURM_MEM_BIND_TYPE
    Set to the memory binding type specified with the SLURM_MEM_BIND option. Possible values are "none", "rank", "map_map", "mask_mem" and "local".

SLURM_MEM_BIND_VERBOSE
    Set to "verbose" if the SLURM_MEM_BIND option includes the verbose option. Set to "quiet" otherwise.

SLURM_MEM_PER_CPU
    Minimum memory required per usable allocated CPU.

SLURM_MEM_PER_GPU
    Requested memory per allocated GPU.

SLURM_MEM_PER_NODE
    Specify the real memory required per node.

SLURM_NTASKS
    Specify the number of tasks to run.

SLURM_NTASKS_PER_CORE
    Request the maximum ntasks be invoked on each core.

SLURM_NTASKS_PER_GPU
    Request that there are ntasks tasks invoked for every GPU.

SLURM_NTASKS_PER_NODE
    Request that ntasks be invoked on each node.

SLURM_NTASKS_PER_SOCKET
    Request the maximum ntasks be invoked on each socket.

SLURM_OVERCOMMIT
    Overcommit resources.

SLURM_PROFILE
    Enables detailed data collection by the acct_gather_profile plugin.

SLURM_SHARDS_ON_NODE
    Number of GPU Shards available to the step on this node.

SLURM_SUBMIT_HOST
    The hostname of the computer from which scrun was invoked.

SLURM_TASKS_PER_NODE
    Number of tasks to be initiated on each node. Values are comma separated and in the same order as SLURM_JOB_NODELIST. If two or more consecutive nodes are to have the same task count, that count is followed by "(x#)" where "#" is the repetition count. For example, "SLURM_TASKS_PER_NODE=2(x3),1" indicates that the first three nodes will each execute two tasks and the fourth node will execute one task.

SLURM_THREADS_PER_CORE
    This is only set if --threads-per-core or SCRUN_THREADS_PER_CORE were specified. The value will be set to the value specified by --threads-per-core or SCRUN_THREADS_PER_CORE. This is used by subsequent srun calls within the job allocation.

SLURM_TRES_PER_TASK
    Set to the value of --tres-per-task. If --cpus-per-task or --gpus-per-task is specified, it is also set in SLURM_TRES_PER_TASK as if it were specified in --tres-per-task.

SCRUN.LUA

/etc/slurm/scrun.lua must be present on any node where scrun will be invoked. scrun.lua must be a compliant lua script.

  Required functions
The following functions must be defined.

• function slurm_scrun_stage_in(id, bundle, spool_dir, config_file, job_id, user_id, group_id, job_env)
    Called right after job allocation to stage container into job node(s). Must return SLURM.success or job will be cancelled. It is required that function will prepare the container for execution on job node(s) as required to run as configured in oci.conf(1). The function may block as long as required until container has been fully prepared (up to the job's max wall time).

    id  Container ID

    bundle
        OCI bundle path

    spool_dir
        Temporary working directory for container

    config_file
        Path to config.json for container

    job_id
        jobid of job allocation

    user_id
        Resolved numeric user id of job allocation. It is generally expected that the lua script will be executed inside of a user namespace running under the root(0) user.

    group_id
        Resolved numeric group id of job allocation. It is generally expected that the lua script will be executed inside of a user namespace running under the root(0) group.

    job_env
        Table with each entry of Key=Value or Value of each environment variable of the job.

• function slurm_scrun_stage_out(id, bundle, orig_bundle, root_path, orig_root_path, spool_dir, config_file, jobid, user_id, group_id)
    Called right after container step completes to stage out files from job nodes. Must return SLURM.success or job will be cancelled. It is required that function will pull back any changes and cleanup the container on job node(s). The function may block as long as required until container has been fully prepared (up to the job's max wall time).

    id  Container ID

    bundle
        OCI bundle path

    orig_bundle
        Originally submitted OCI bundle path before modification by set_bundle_path().

    root_path
        Path to directory root of container contents.

    orig_root_path
        Original path to directory root of container contents before modification by set_root_path().

    spool_dir
        Temporary working directory for container

    config_file
        Path to config.json for container

    job_id
        jobid of job allocation

    user_id
        Resolved numeric user id of job allocation. It is generally expected that the lua script will be executed inside of a user namespace running under the root(0) user.

    group_id
        Resolved numeric group id of job allocation. It is generally expected that the lua script will be executed inside of a user namespace running under the root(0) group.

  Provided functions
The following functions are provided for any Lua function to call as needed.

• slurm.set_bundle_path(PATH)
    Called to notify scrun to use PATH as new OCI container bundle path. Depending on the filesystem layout, cloning the container bundle may be required to allow execution on job nodes.

• slurm.set_root_path(PATH)
    Called to notify scrun to use PATH as new container root filesystem path. Depending on the filesystem layout, cloning the container bundle may be required to allow execution on job nodes. Script must also update #/root/path in config.json when changing root path.

• STATUS,OUTPUT = slurm.remote_command(SCRIPT)
    Run SCRIPT in new job step on all job nodes. Returns numeric job status as STATUS and job stdio as OUTPUT. Blocks until SCRIPT exits.

• STATUS,OUTPUT = slurm.allocator_command(SCRIPT)
    Run SCRIPT as forked child process of scrun. Returns numeric job status as STATUS and job stdio as OUTPUT. Blocks until SCRIPT exits.

• slurm.log(MSG, LEVEL)
    Log MSG at log LEVEL. Valid range of values for LEVEL is [0, 4].

• slurm.error(MSG)
    Log error MSG.

• slurm.log_error(MSG)
    Log error MSG.

• slurm.log_info(MSG)
    Log MSG at log level INFO.

• slurm.log_verbose(MSG)
    Log MSG at log level VERBOSE.

• slurm.log_verbose(MSG)
    Log MSG at log level VERBOSE.

• slurm.log_debug(MSG)
    Log MSG at log level DEBUG.

• slurm.log_debug2(MSG)
    Log MSG at log level DEBUG2.

• slurm.log_debug3(MSG)
    Log MSG at log level DEBUG3.

• slurm.log_debug4(MSG)
    Log MSG at log level DEBUG4.

• MINUTES = slurm.time_str2mins(TIME_STRING)
    Parse TIME_STRING into number of minutes as MINUTES. Valid formats:

    • days-[hours[:minutes[:seconds]]]

    • hours:minutes:seconds

    • minutes[:seconds]

    • -1

    • INFINITE

    • UNLIMITED

  Example scrun.lua scripts

Full Container staging example using rsync:
    This full example will stage a container as given by docker or podman. The container's config.json is modified to remove unwanted functions that may cause the container run to under crun or runc. The script uses rsync to move the container to a shared filesystem under the scratch_path variable. NOTE: Support for JSON in liblua must generally be installed before Slurm is compiled. scrun.lua's syntax and ability to load JSON support should be tested by directly calling the script using lua outside of Slurm.
    local json = require 'json'
    local open = io.open
    local scratch_path = "/run/user/"
    local function read_file(path)
    	local file = open(path, "rb")
    	if not file then return nil end
    	local content = file:read "*all"
    	file:close()
    	return content
    end
    local function write_file(path, contents)
    	local file = open(path, "wb")
    	if not file then return nil end
    	file:write(contents)
    	file:close()
    	return
    end
    function slurm_scrun_stage_in(id, bundle, spool_dir, config_file, job_id, user_id, group_id, job_env)
    	slurm.log_debug(string.format("stage_in(%s, %s, %s, %s, %d, %d, %d)",
    		       id, bundle, spool_dir, config_file, job_id, user_id, group_id))
    	local status, output, user, rc
    	local config = json.decode(read_file(config_file))
    	local src_rootfs = config["root"]["path"]
    	rc, user = slurm.allocator_command(string.format("id -un %d", user_id))
    	user = string.gsub(user, "%s+", "")
    	local root = scratch_path..math.floor(user_id).."/slurm/scrun/"
    	local dst_bundle = root.."/"..id.."/"
    	local dst_config = root.."/"..id.."/config.json"
    	local dst_rootfs = root.."/"..id.."/rootfs/"
    	if string.sub(src_rootfs, 1, 1) ~= "/"
    	then
    		-- always use absolute path
    		src_rootfs = string.format("%s/%s", bundle, src_rootfs)
    	end
    	status, output = slurm.allocator_command("mkdir -p "..dst_rootfs)
    	if (status ~= 0)
    	then
    		slurm.log_info(string.format("mkdir(%s) failed %u: %s",
    			       dst_rootfs, status, output))
    		return slurm.ERROR
    	end
    	status, output = slurm.allocator_command(string.format("/usr/bin/env rsync --exclude sys --exclude proc --numeric-ids --delete-after --ignore-errors --stats -a -- %s/ %s/", src_rootfs, dst_rootfs))
    	if (status ~= 0)
    	then
    		-- rsync can fail due to permissions which may not matter
    		slurm.log_info(string.format("WARNING: rsync failed: %s", output))
    	end
    	slurm.set_bundle_path(dst_bundle)
    	slurm.set_root_path(dst_rootfs)
    	config["root"]["path"] = dst_rootfs
    	-- Always force user namespace support in container or runc will reject
    	local process_user_id = 0
    	local process_group_id = 0
    	if ((config["process"] ~= nil) and (config["process"]["user"] ~= nil))
    	then
    		-- resolve out user in the container
    		if (config["process"]["user"]["uid"] ~= nil)
    		then
    			process_user_id=config["process"]["user"]["uid"]
    		else
    			process_user_id=0
    		end
    		-- resolve out group in the container
    		if (config["process"]["user"]["gid"] ~= nil)
    		then
    			process_group_id=config["process"]["user"]["gid"]
    		else
    			process_group_id=0
    		end
    		-- purge additionalGids as they are not supported in rootless
    		if (config["process"]["user"]["additionalGids"] ~= nil)
    		then
    			config["process"]["user"]["additionalGids"] = nil
    		end
    	end
    	if (config["linux"] ~= nil)
    	then
    		-- force user namespace to always be defined for rootless mode
    		local found = false
    		if (config["linux"]["namespaces"] == nil)
    		then
    			config["linux"]["namespaces"] = {}
    		else
    			for _, namespace in ipairs(config["linux"]["namespaces"]) do
    				if (namespace["type"] == "user")
    				then
    					found=true
    					break
    				end
    			end
    		end
    		if (found == false)
    		then
    			table.insert(config["linux"]["namespaces"], {type= "user"})
    		end
    		-- Provide default user map as root if one not provided
    		if (true or config["linux"]["uidMappings"] == nil)
    		then
    			config["linux"]["uidMappings"] =
    				{{containerID=process_user_id, hostID=math.floor(user_id), size=1}}
    		end
    		-- Provide default group map as root if one not provided
    		-- mappings fail with build???
    		if (true or config["linux"]["gidMappings"] == nil)
    		then
    			config["linux"]["gidMappings"] =
    				{{containerID=process_group_id, hostID=math.floor(group_id), size=1}}
    		end
    		-- disable trying to use a specific cgroup
    		config["linux"]["cgroupsPath"] = nil
    	end
    	if (config["mounts"] ~= nil)
    	then
    		-- Find and remove any user/group settings in mounts
    		for _, mount in ipairs(config["mounts"]) do
    			local opts = {}
    			if (mount["options"] ~= nil)
    			then
    				for _, opt in ipairs(mount["options"]) do
    					if ((string.sub(opt, 1, 4) ~= "gid=") and (string.sub(opt, 1, 4) ~= "uid="))
    					then
    						table.insert(opts, opt)
    					end
    				end
    			end
    			if (opts ~= nil and #opts > 0)
    			then
    				mount["options"] = opts
    			else
    				mount["options"] = nil
    			end
    		end
    		-- Remove all bind mounts by copying files into rootfs
    		local mounts = {}
    		for i, mount in ipairs(config["mounts"]) do
    			if ((mount["type"] ~= nil) and (mount["type"] == "bind") and (string.sub(mount["source"], 1, 4) ~= "/sys") and (string.sub(mount["source"], 1, 5) ~= "/proc"))
    			then
    				status, output = slurm.allocator_command(string.format("/usr/bin/env rsync --numeric-ids --ignore-errors --stats -a -- %s %s", mount["source"], dst_rootfs..mount["destination"]))
    				if (status ~= 0)
    				then
    					-- rsync can fail due to permissions which may not matter
    					slurm.log_info("rsync failed")
    				end
    			else
    				table.insert(mounts, mount)
    			end
    		end
    		config["mounts"] = mounts
    	end
    	-- Force version to one compatible with older runc/crun at risk of new features silently failing
    	config["ociVersion"] = "1.0.0"
    	-- Merge in Job environment into container -- this is optional!
    	if (config["process"]["env"] == nil)
    	then
    		config["process"]["env"] = {}
    	end
    	for _, env in ipairs(job_env) do
    		table.insert(config["process"]["env"], env)
    	end
    	-- Remove all prestart hooks to squash any networking attempts
    	if ((config["hooks"] ~= nil) and (config["hooks"]["prestart"] ~= nil))
    	then
    		config["hooks"]["prestart"] = nil
    	end
    	-- Remove all rlimits
    	if ((config["process"] ~= nil) and (config["process"]["rlimits"] ~= nil))
    	then
    		config["process"]["rlimits"] = nil
    	end
    	write_file(dst_config, json.encode(config))
    	slurm.log_info("created: "..dst_config)
    	return slurm.SUCCESS
    end
    function slurm_scrun_stage_out(id, bundle, orig_bundle, root_path, orig_root_path, spool_dir, config_file, jobid, user_id, group_id)
    	if (root_path == nil)
    	then
    		root_path = ""
    	end
    	slurm.log_debug(string.format("stage_out(%s, %s, %s, %s, %s, %s, %s, %d, %d, %d)",
    		       id, bundle, orig_bundle, root_path, orig_root_path, spool_dir, config_file, jobid, user_id, group_id))
    	if (bundle == orig_bundle)
    	then
    		slurm.log_info(string.format("skipping stage_out as bundle=orig_bundle=%s", bundle))
    		return slurm.SUCCESS
    	end
    	status, output = slurm.allocator_command(string.format("/usr/bin/env rsync --numeric-ids --delete-after --ignore-errors --stats -a -- %s/ %s/", root_path, orig_root_path))
    	if (status ~= 0)
    	then
    		-- rsync can fail due to permissions which may not matter
    		slurm.log_info("rsync failed")
    	else
    		-- cleanup temporary after they have been synced backed to source
    		slurm.allocator_command(string.format("/usr/bin/rm --preserve-root=all --one-file-system -dr -- %s", bundle))
    	end
    	return slurm.SUCCESS
    end
    slurm.log_info("initialized scrun.lua")
    return slurm.SUCCESS

SIGNALS

SIGINT
    Attempt to gracefully cancel any related jobs (if any) and cleanup.

SIGCHLD
    Wait for all children, cleanup anchor and gracefully shutdown.

COPYING
Copyright (C) 2023 SchedMD LLC.

This file is part of Slurm, a resource management program. For details, see <https://slurm.schedmd.com/>.

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.

SEE ALSO

slurm(1), oci.conf(5), srun(1), crun, runc, DOCKER and podman