add a machine file for MacOS (#777)

Co-authored-by: Natalie Perlin <[email protected]>

ush/machine/macos.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+
+set -x
+
+function file_location() {
+
+  # Return the default location of external model files on disk
+
+  local external_file_fmt external_model location
+
+  external_model=${1}
+  external_file_fmt=${2}
+
+  case ${external_model} in
+
+    "FV3GFS")
+      location='/Users/username/DATA/UFS/FV3GFS/'
+      ;;
+    *)
+      print_info_msg"\
+        External model \'${external_model}\' does not have a default
+      location on MacOSX. "
+      ;;
+
+  esac
+  echo ${location:-}
+}
+
+
+EXTRN_MDL_SYSBASEDIR_ICS=${EXTRN_MDL_SYSBASEDIR_ICS:-$(file_location \
+  ${EXTRN_MDL_NAME_ICS} \
+  ${FV3GFS_FILE_FMT_ICS})}
+EXTRN_MDL_SYSBASEDIR_LBCS=${EXTRN_MDL_SYSBASEDIR_LBCS:-$(file_location \
+  ${EXTRN_MDL_NAME_LBCS} \
+  ${FV3GFS_FILE_FMT_ICS})}
+
+ System scripts to source to initialize various commands within workflow
+ scripts (e.g. "module").
+if [ -z ${ENV_INIT_SCRIPTS_FPS:-""} ]; then
+  ENV_INIT_SCRIPTS_FPS=( "/etc/profile" )
+fi
+
+
+# Commands to run at the start of each workflow task.
+PRE_TASK_CMDS='{ ulimit -a; }'
+
+# Architecture information
+WORKFLOW_MANAGER="none"
+NCORES_PER_NODE=${NCORES_PER_NODE:-8}
+SCHED=${SCHED:-"none"}
+
+# UFS SRW App specific paths
+FIXgsm=${FIXgsm:-"/Users/username/DATA/UFS/fix/fix_am"}
+FIXaer=${FIXaer:-"/Users/username/DATA/UFS/fix/fix_aer"}
+FIXlut=${FIXlut:-"/Users/username/DATA/UFS/fix/fix_lut"}
+TOPO_DIR=${TOPO_DIR:-"/Users/username/DATA/UFS/fix/fix_orog"}
+SFC_CLIMO_INPUT_DIR=${SFC_CLIMO_INPUT_DIR:-"/Users/username/DATA/UFS/fix/fix_sfc_climo"}
+
+# Run commands for executables
+RUN_CMD_SERIAL="time"
+#Run Commands currently differ for GNU/openmpi
+RUN_CMD_UTILS='mpirun -n 4'
+RUN_CMD_FCST='mpirun -n ${PE_MEMBER01} '
+RUN_CMD_POST='mpirun -n 4 '
+
+# MET Installation Locations
+