Added proposed changes by @mojodna

app/migrations/9999_postgis.py

@@ -4,6 +4,6 @@ class Migration(migrations.Migration):
     dependencies = [("app", "0001_initial")]
 
     operations = [
-        migrations.RunSQL("SET postgis.enable_outdb_rasters TO True;"),
-        migrations.RunSQL("SET postgis.gdal_enabled_drivers TO 'GTiff';")
+        migrations.RunSQL("ALTER SYSTEM SET postgis.enable_outdb_rasters TO True;"),
+        migrations.RunSQL("ALTER SYSTEM SET postgis.gdal_enabled_drivers TO 'GTiff';")
     ]

start.sh

@@ -18,7 +18,7 @@ almost_there(){
 
 # Check python version
 python -c "import sys;ret = 1 if sys.version_info <= (3, 0) else 0;print('Checking python version... ' + ('3.x, good!' if ret == 0 else '2.x'));sys.exit(ret);"
-if [ $? -eq 1 ]; then
+if [ $? -ne 0 ]; then
 	almost_there
     echo -e "\e[33mYour system is currently using Python 2.x. You need to install or configure your system to use Python 3.x. Check out http://docs.python-guide.org/en/latest/dev/virtualenvs/ for information on how to setup Python 3.x alongside your Python 2.x install.\e[39m"
     echo
@@ -27,7 +27,7 @@ fi
 
 # Check GDAL version
 python -c "import sys;import re;import subprocess;version = subprocess.Popen([\"gdalinfo\", \"--version\"], stdout=subprocess.PIPE).communicate()[0].decode().rstrip();ret = 0 if re.compile('^GDAL [2-9]\.[1-9]+').match(version) else 1; print('Checking GDAL version... ' + ('{}, excellent!'.format(version) if ret == 0 else version));sys.exit(ret);"
-if [ $? -eq 1 ]; then
+if [ $? -ne 0 ]; then
 	almost_there
     echo -e "\e[33mYour system is currently using a version of GDAL that is too old, or GDAL is not installed. You need to install or configure your system to use GDAL 2.1 or higher. If you have installed multiple versions of GDAL, make sure the newer one takes priority in your PATH environment variable.\e[39m"
     echo

webodm.sh

@@ -1,12 +1,16 @@
 #!/bin/bash
+set -eo pipefail
 
 platform="Linux" # Assumed
-uname=`uname`
-if [[ $uname == "Darwin" ]]; then
-	platform = "MacOS / OSX"
-elif [[ $uname == MINGW* ]]; then
-	platform = "Windows"
-fi
+uname=$(uname)
+case $uname in
+	"Darwin")
+	platform="MacOS / OSX"
+	;;
+	MINGW*)
+	platform="Windows"
+	;;
+esac
 
 usage(){
   echo "Usage: $0 <command> [options]"
@@ -30,9 +34,7 @@ check_command(){
 
 	echo -e "Checking for $1... $check_msg"
 	
-	if [[ $not_found ]]; then
-		exit 1
-	fi
+	return 1
 }
 
 environment_check(){