Fix addKey to handle substrings of existing keys

Fix addKey to handle the case where a key is being added, and that key
is the leading substring of an already existing key within that file.

For example: add "server=192.168.1.1", when "server=192.168.1.178"
already exists within the /etc/dnsmasq.d/01-pihole.conf file.

Check pihole docker with PIHOLE_DNS="192.168.1.178;192.168.1.1". Its
/etc/dnsmasq/01-pihole.conf will be missing its second server= entry.

Add the test_key_addition_substr, to test addKey when
its adding a substring key of an existing key in the file.

Signed-off-by: William Blew <william@kulian.org>

advanced/Scripts/utils.sh

@@ -57,7 +57,7 @@ addKey(){
   # touch file to prevent grep error if file does not exist yet
   touch "${file}"
 
-  if ! grep -q "^${key}" "${file}"; then
+  if ! grep -q "^${key}$" "${file}"; then
     # Key does not exist, add it.
     echo "${key}" >> "${file}"
   fi

test/test_any_utils.py

@@ -40,6 +40,26 @@ def test_key_addition_works(host):
     assert expected_stdout == output.stdout
 
 
+def test_key_addition_substr(host):
+    """Confirms addKey adds substring keys (no value) to a file"""
+    host.run(
+        """
+    source /opt/pihole/utils.sh
+    addKey "./testoutput" "KEY_ONE"
+    addKey "./testoutput" "KEY_O"
+    addKey "./testoutput" "KEY_TWO"
+    addKey "./testoutput" "Y_TWO"
+    """
+    )
+    output = host.run(
+        """
+    cat ./testoutput
+    """
+    )
+    expected_stdout = "KEY_ONE\nKEY_O\nKEY_TWO\nY_TWO\n"
+    assert expected_stdout == output.stdout
+
+
 def test_key_removal_works(host):
     """Confirms removeKey removes a key or key/value pair"""
     host.run(