add abra.sh function to import users from CSV files

abra.sh

@@ -27,6 +27,42 @@ customize() {
     done
 }
 
+import_user() {
+    if [ -z "$1" ]
+    then
+            echo "Usage: ... import_user <users.csv>"
+            exit 1
+    fi
+    source_file=$1
+    filename=$(basename $source_file)
+    abra app cp $APP_NAME $source_file worker:/tmp/
+    abra app cmd -T $APP_NAME worker _import_user $filename
+}
+
+_import_user() {
+/manage.py shell -c """
+import csv
+new_user = User()
+with open('/tmp/$1', newline='') as file:
+  reader = csv.reader(file)
+  for row in reader:
+    name = row[0].strip()
+    username = row[1].strip()
+    email = row[2].strip()
+    groups = row[3].split(';')
+    if User.objects.filter(username=username):
+        continue
+    new_user = User.objects.create(name=name, username=username, email=email)
+    for group_name in groups:
+        group_name = group_name.strip()
+        if Group.objects.filter(name=group_name):
+            group = Group.objects.get(name=group_name)
+        else:
+            group = Group.objects.create(name=group_name)
+        group.users.add(new_user)
+""" 2>&1 | quieten
+}
+
 set_admin_pass() {
 password=$(cat /run/secrets/admin_pass)
 token=$(cat /run/secrets/admin_token)