Modify byron-to-mary/mkfiles.sh to take a string argument that specifies

which era to start the nodes in. The nodes can be started in shelley,
allegra or mary era by supplying the script with shelley, allegra or
mary string arguments respectively. E.g ./byron-to-mary/mkfiles.sh mary

scripts/README.md

@@ -2,7 +2,7 @@
 The `scripts` directory consists of the following directories:
 - [benchmarking](#benchmarking)
 - [buildkite](#buildkite)
-- [byron-shelley](#byron-shelley)
+- [byron-shelley-allegra-mary](#byron-shelley-allegra-mary)
 - [lite](#lite)
 - [shelley-from-scratch](#shelley-from-scratch)
 
@@ -12,11 +12,16 @@ Contains all the scripts relevant to benchmarking `cardano-node`. See the benchm
 #### buildkite
 Contains scripts relevant to IOHK's CI.
 
-#### byron-shelley
-Contains a script that sets up a cluster beginning in the Byron era and can transition to the Shelley era.
-
+#### byron-shelley-allegra-mary
+Contains a script that sets up a cluster beginning in the Byron era and can transition to the Shelley era. You can also start a cluster in the Shelley, Allegra or Mary era by supplying an argument to `mk-files.sh`.
+E.g
+```bash
+./scripts/byron-to-mary/mk-files.sh shelley # Starts nodes in Shelley era
+./scripts/byron-to-mary/mk-files.sh allegra # Starts nodes in Allegra era
+./scripts/byron-to-mary/mk-files.sh mary    # Starts nodes in Mary era
+```
 #### lite
-Contains scripts that can start various clusters and intended to be as simple as possible.
+Contains scripts that can start various clusters and intended to be as simple as possible. Note that using the shelley only era testnet clusters breaks compatibility with some cli commands.
 
 #### shelley-from-scratch
 Contains a script that creates all the necessary keys etc to create a shelley cluster from scratch.

scripts/byron-to-mary/mkfiles.sh

@@ -32,8 +32,9 @@ set -e
 #    below. It's good for a quick test, and does not rely on posting update
 #    proposals to the chain.
 #    This is quite convenient, but it does not test that we can do the
-#    transition by posting update proposals to the network.
-#
+#    transition by posting update proposals to the network. For even more convenience
+#    if you want to start a node in Shelley, Allegra or Mary from epoch 0, supply the script
+#    with a shelley, allegra or mary string argument. E.g mkfiles.sh mary.
 
 ROOT=example
 
@@ -540,3 +541,31 @@ echo "  --cardano-mode --allegra-era --testnet-magic 42"
 echo
 echo "Similarly, use --mary-era in the Mary era."
 popd
+
+# For an automatic transition at epoch 0, specifying mary, allegra or shelley
+# will start the node in the appropriate era.
+echo ""
+if [ "$1" = "mary" ]; then
+  echo "TestShelleyHardForkAtEpoch: 0"  >> ${ROOT}/configuration.yaml
+  echo "TestAllegraHardForkAtEpoch: 0"  >> ${ROOT}/configuration.yaml
+  echo "TestMaryHardForkAtEpoch: 0"  >> ${ROOT}/configuration.yaml
+  sed -i ${ROOT}/configuration.yaml \
+      -e 's/LastKnownBlockVersion-Major: 1/LastKnownBlockVersion-Major: 4/'
+  echo "Nodes will start in Mary era from epoch 0"
+
+elif [ "$1" = "allegra" ]; then
+  echo "TestShelleyHardForkAtEpoch: 0"  >> ${ROOT}/configuration.yaml
+  echo "TestAllegraHardForkAtEpoch: 0"  >> ${ROOT}/configuration.yaml
+  sed -i ${ROOT}/configuration.yaml \
+      -e 's/LastKnownBlockVersion-Major: 1/LastKnownBlockVersion-Major: 3/'
+  echo "Nodes will start in Allegra era from epoch 0"
+
+elif [ "$1" = "shelley" ]; then
+  echo "TestShelleyHardForkAtEpoch: 0"  >> ${ROOT}/configuration.yaml
+  sed -i ${ROOT}/configuration.yaml \
+      -e 's/LastKnownBlockVersion-Major: 1/LastKnownBlockVersion-Major: 2/'
+  echo "Nodes will start in Shelley era from epoch 0"
+
+else
+  echo "Default yaml configuration applied."
+fi