add env var for tmpdir prefix

system-test/system-test.bats

@@ -23,6 +23,11 @@ if [[ -z "${GLOBAL_LUSTRE_ROOT}" ]]; then
     GLOBAL_LUSTRE_ROOT=/lus/global
 fi
 
+# Test Tempdir directory
+if [[ -z "${TEST_TMPDIR_PREFIX}" ]]; then
+    TEST_TMPDIR_PREFIX=${HOME}/nnf/tmp
+fi
+
 # Number of compute nodes; default to 4
 if [[ -z "${N}" ]]; then
     N=4
@@ -61,15 +66,14 @@ function setup_file {
 
     # For lustre tests, use the total capacity given the node count
     export LUS_CAPACITY=$(($N * $GB_PER_NODE))
+
+    # Ensure tempdir prefix directory exists
+    mkdir -p ${TEST_TMPDIR_PREFIX}
 }
 
 function setup {
-    # Create a tmpdir. To run flux jobs from this directory (which we do), I believe this needs to
-    # reside in the users homedir so the computes can reach the script. For now, use the working
-    # directory, which is assumed to be somewhere in a homedir.
-    # TODO: How is this going to work on dev systems with no NFS homedirs?
-    script_dir=$(pwd)
-    export TEST_TMPDIR=$(mktemp -d -p $script_dir)
+    # Create a test tmpdir at the supplied prefix (e.g. /home/user/nnf/tmp.x8e8f0a/)
+    export TEST_TMPDIR=$(mktemp -d -p ${TEST_TMPDIR_PREFIX})
 }
 
 function teardown {
@@ -327,6 +331,7 @@ function create_capacity_file {
     chmod +x $runit_file
     cat << 'EOF' >> $runit_file
 #!/bin/bash
+echo "jobid: $(flux getattr jobid)"
 requested_size=$1
 capacity_percent=$2