Node input files are not translated from absolute path to relative path

When using transfer_input_files with HTCondor, files with absolute paths are copied into the base directory of the job sandbox; however ezdag doesn't translate the absolute path used in transfer_input_files to a relative path for the job arguments.

Consider the following example:

from ezdag import (
    Argument,
    DAG,
    Layer,
    Node,
)

dag = DAG()

common_options = {
    "request_cpus": 1,
    "request_memory": 2000,
}

inputs = [
   "osdf://igwn/ligo/README",
]

touch_layer = Layer(
    "/bin/head",
    name="head",
    submit_description=common_options,
)
for i, osdf in enumerate(inputs):
    file = f"file_{i}.txt"
    touch_layer += Node(
        inputs=Argument("infile", [osdf]),
    )

dag.attach(touch_layer)
dag.write_dag("example.dag")

This results in the following DAG:

# BEGIN META
# END META
# BEGIN NODES AND EDGES
JOB head:00000 head.sub
VARS head:00000 nodename="head:00000" infile="osdf://igwn/ligo/README" input_infile="osdf://igwn/ligo/README"
RETRY head:00000 3
# END NODES AND EDGES

and the following head.sub file:

universe = vanilla
executable = /bin/head
arguments = $(infile)
request_cpus = 1
request_memory = 2000
should_transfer_files = YES
when_to_transfer_output = ON_SUCCESS
success_exit_code = 0
preserve_relative_paths = True
transfer_input_files = $(input_infile)
output = logs/$(nodename)-$(cluster)-$(process).out
error = logs/$(nodename)-$(cluster)-$(process).err
notification = never

queue

The $(infile) argument currently matches the $(input_infile) argument, which means that the job ignores the file that was transferred by HTCondor, and attempts to use the URL passed to transfer_input_files.

What might be a simple solution is to use the $BASENAME function macro to translate absolute paths dynamically, e.g:

arguments = $BASENAME(infile)

However, this only works out-of-the-box for the case where $(infile) represents a single URL.