set default cred loading for newer curl now where possible as it's more reliable as doesn't need parsing

curl_auth.sh

@@ -63,7 +63,9 @@ if [ -z "${KRB5:-${KERBEROS:-}}" ]; then
 # works on Mac but not on Linux, so going back to parsing the hostname and dynamic loading
 # curl 7.64.1 (x86_64-apple-darwin19.0) libcurl/7.64.1 (SecureTransport) LibreSSL/2.8.3 zlib/1.2.11 nghttp2/1.39.2
 # curl 7.35.0 (x86_64-pc-linux-gnu) libcurl/7.35.0 OpenSSL/1.0.1f zlib/1.2.8 libidn/1.28 librtmp/2.3
-#netrc_contents="default login $USERNAME password $PASSWORD"
+if is_curl_min_version 7.64; then
+    netrc_contents="default login $USERNAME password $PASSWORD"
+fi
 
 # ==============================================
 # option 2
@@ -83,13 +85,15 @@ if [ -z "${KRB5:-${KERBEROS:-}}" ]; then
 
 # Instead of generating this for all known hosts above just do it for the host extracted from the args url now
 
-if ! [[ "$*" =~ :// ]]; then
-    usage "http(s):// not specified in URL"
-fi
+if [ -z "$netrc_contents" ]; then
+    if ! [[ "$*" =~ :// ]]; then
+        usage "http(s):// not specified in URL"
+    fi
 
-host="$(grep -om 1 '://[^:\/[:space:]]\+' <<< "$*" | sed 's,://,,')"
+    host="$(grep -om 1 '://[^:\/[:space:]]\+' <<< "$*" | sed 's,://,,')"
 
-netrc_contents="machine $host login $USERNAME password $PASSWORD"
+    netrc_contents="machine $host login $USERNAME password $PASSWORD"
+fi
 
 # ==============================================