Merge bitcoin#21111: Improve OpenRC initscript

95f9711 contrib/init: (OpenRC) quote some unquoted variables. (parazyd)
737fead contrib/init: (OpenRC) Do not fail if both rpcuser and rpcpassword are unset. (parazyd)

Pull request description:

  This pull request improves the available OpenRC initscripts in
  `contrib/init`.

  The first commit (737fead) reworks
  `checkconfig()` to not fail if **both** `rpcuser` and `rpcpassword`
  are unset, because this implies that bitcoind shall use the `.cookie`
  file for RPC authentication. Currently, the initscript does not allow
  starting bitcoind without a set `rpcuser` and `rpcpassword`.

  The second commit (95f9711) simply
  quotes some unquoted variables.

ACKs for top commit:
  kristapsk:
    ACK 95f9711

Tree-SHA512: 62bebcd07143c147e349c0cfc17b54ef21bd4684377b444f58c6bd1f509a4d3e1af58746fa7215f18e33021f691bbbc5e42f4df497458322b055e545b7f30d46

contrib/init/bitcoind.openrc

@@ -60,16 +60,17 @@ start_pre() {
 	"${BITCOIND_PIDDIR}"
 
 	checkpath -f \
-	-o ${BITCOIND_USER}:${BITCOIND_GROUP} \
+	-o "${BITCOIND_USER}:${BITCOIND_GROUP}" \
 	-m 0660 \
-	${BITCOIND_CONFIGFILE}
+	"${BITCOIND_CONFIGFILE}"
 
 	checkconfig || return 1
 }
 
 checkconfig()
 {
-	if ! grep -qs '^rpcpassword=' "${BITCOIND_CONFIGFILE}" ; then
+	if grep -qs '^rpcuser=' "${BITCOIND_CONFIGFILE}" && \
+		! grep -qs '^rpcpassword=' "${BITCOIND_CONFIGFILE}" ; then
 		eerror ""
 		eerror "ERROR: You must set a secure rpcpassword to run bitcoind."
 		eerror "The setting must appear in ${BITCOIND_CONFIGFILE}"