Remove the need for a temporary file

example-dns-01-nsupdate-script.md

@@ -16,20 +16,16 @@ set -u
 set -o pipefail
 umask 077
 
-updatefile="$(mktemp)"
-
 NSUPDATE="nsupdate -k /path/to/Kdnsupdatekey.private"
 done="no"
 
 if [[ "$1" = "deploy_challenge" ]]; then
-    printf "update add _acme-challenge.%s. 300 in TXT \"%s\"\n\n" "${2}" "${4}" > "${updatefile}"
+    printf "update add _acme-challenge.%s. 300 in TXT \"%s\"\n\n" "${2}" "${4}" | $NSUPDATE
-    $NSUPDATE "${updatefile}"
     done="yes"
 fi
 
 if [[ "$1" = "clean_challenge" ]]; then
-    printf "update delete _acme-challenge.%s. 300 in TXT \"%s\"\n\n" "${2}" "${4}" > "${updatefile}"
+    printf "update delete _acme-challenge.%s. 300 in TXT \"%s\"\n\n" "${2}" "${4}" | $NSUPDATE
-    $NSUPDATE "${updatefile}"
     done="yes"
 fi
 
@@ -38,8 +34,6 @@ if [[ "${1}" = "deploy_cert" ]]; then
     done="yes"
 fi
 
-rm -f "${updatefile}"
-
 if [[ ! "${done}" = "yes" ]]; then
     echo Unkown hook "${1}"
     exit 1