Use ${var:?} to ensure this never expands to /* .

https://github.com/koalaman/shellcheck/wiki/SC2115

update_ombi.sh

@@ -99,7 +99,7 @@ unzip-strip() (
         cp -r "$temp"/*/* "$dest"
     else
         cp -r "$temp"/* "$dest"
-    fi && rm -rf "$temp"/* "$temp"
+    fi && rm -rf "${temp:?}"/* "$temp"
 )
 
 # Import any custom config to override the defaults, if necessary
@@ -314,7 +314,7 @@ else
 fi
 
 .log 6 "Cleaning up..."
-rm -rf "$tempdir"/* "$tempdir"
+rm -rf "${tempdir:?}"/* "$tempdir"
 declare -i elapsedtime=$SECONDS
 declare -i minutes=0
 declare -i seconds=0
@@ -334,4 +334,4 @@ elif [ $seconds -eq 1 ]; then
 fi
 durationmsg="Update complete...elapsed time $duration..."
 durationmsg="${durationmsg//  / }"
-.log 6 "$durationmsg"
+.log 6 "$durationmsg"