[FR] - build transactions without outputs in cardano-cli

[refi93]

External

Area
Other cardano-cli

Describe the feature you'd like
Currently, there seems to be no way to serialize raw transactions that would not have an output, which may indeed be convenient when signing certificates where the inputs cover the fees exactly.

Example of a valid command (tx with one output):

cardano-cli shelley transaction build-raw --tx-in 89ba28b30e5eebc7d37c0123713b9e6089b90e07b3fb7d33979dc8d443df646e#1 --tx-out addr_test1qrwzf2dkeseu6mcv3jtw8muvseqz55np5529269lgg6fvap60uya8h6v7e488xwzkpdl5g6dtg54vrp3rlzaknzfqugse3ujve+50 --ttl 42 --fee 42 --out-file tx_example.raw

But this one (the same except missing output) fails with Missing: --tx-out TX-OUT error even though a tx with no outputs should technically be a valid tx, if I understand correctly:

cardano-cli shelley transaction build-raw --tx-in 89ba28b30e5eebc7d37c0123713b9e6089b90e07b3fb7d33979dc8d443df646e#1 --ttl 42 --fee 42 --out-file tx_no_out.raw

[dcoutts]

diff --git a/cardano-cli/src/Cardano/CLI/Shelley/Parsers.hs b/cardano-cli/src/Cardano/CLI/Shelley/Parsers.hs
index e09e6a3f..08796631 100644
--- a/cardano-cli/src/Cardano/CLI/Shelley/Parsers.hs
+++ b/cardano-cli/src/Cardano/CLI/Shelley/Parsers.hs
@@ -501,7 +501,7 @@ pTransaction =
   pTransactionBuild :: Parser TransactionCmd
   pTransactionBuild = TxBuildRaw <$> pCardanoEra
                                  <*> some pTxIn
-                                 <*> some pTxOut
+                                 <*> many pTxOut
                                  <*> optional pMintMultiAsset
                                  <*> optional pInvalidBefore
                                  <*> optional pInvalidHereafter