Change prow creds parsing to allow no new lines

Author: Cecile Robert-Michon

hack/create-dev-cluster.sh

@@ -17,13 +17,13 @@ set -o errexit
 set -o nounset
 set -o pipefail
 
-# for Prow we use the provided AZURE_CREDENTIALS file
+# for Prow we use the provided AZURE_CREDENTIALS file.
+# the file is expected to be in toml format.
 if [[ -n "${AZURE_CREDENTIALS:-}" ]]; then
-    export AZURE_SUBSCRIPTION_ID="$(cat ${AZURE_CREDENTIALS} | grep SubscriptionID | cut -d '=' -f 2)"
-    export AZURE_TENANT_ID="$(cat ${AZURE_CREDENTIALS} | grep TenantID | cut -d '=' -f 2)"
-    export AZURE_CLIENT_ID="$(cat ${AZURE_CREDENTIALS} | grep ClientID | cut -d '=' -f 2)"
-    # password might contain an '=' sign so we need to get all the fields after the first '=' 
-    export AZURE_CLIENT_SECRET="$(cat ${AZURE_CREDENTIALS} | grep ClientSecret | cut -d '=' -f 2-)"
+    export AZURE_SUBSCRIPTION_ID="$(cat ${AZURE_CREDENTIALS} | grep -E -o 'SubscriptionID[[:blank:]]*=[[:blank:]]*"[^[:space:]"]+"' | cut -d '"' -f 2)"
+    export AZURE_TENANT_ID="$(cat ${AZURE_CREDENTIALS} | grep -E -o 'TenantID[[:blank:]]*=[[:blank:]]*"[^[:space:]"]+"' | cut -d '"' -f 2)"
+    export AZURE_CLIENT_ID="$(cat ${AZURE_CREDENTIALS} | grep -E -o 'ClientID[[:blank:]]*=[[:blank:]]*"[^[:space:]"]+"' | cut -d '"' -f 2)"
+    export AZURE_CLIENT_SECRET="$(cat ${AZURE_CREDENTIALS} | grep -E -o 'ClientSecret[[:blank:]]*=[[:blank:]]*"[^[:space:]"]+"' | cut -d '"' -f 2)"
 fi 
 
 # Verify the required Environment Variables are present.