Bump required Go version to 1.19 and check in setup.sh

`encoding.binary.BigEndian.AppendUint32` was only added in 1.19, so bump
the required version to that.

Author: jorgenpt

README.md

@@ -69,7 +69,7 @@ When it is done, there will be a changelist that must be submitted by hand, givi
 ## Development setup
 
 - Ensure you have all the [Runtime requirements](#runtime-requirements)
-- Ensure you have a [recent version of Go (1.17+)](https://go.dev/dl/)
+- Ensure you have a [recent version of Go (1.19+)](https://go.dev/dl/)
   - Ensure that $GOPATH/bin is added to your $PATH environment variable.
 - To run all the tests, you'll want to have Docker installed
   - On Windows and Mac, you'll want [Docker Desktop](https://www.docker.com/products/docker-desktop)

scripts/setup.sh

@@ -1,19 +1,30 @@
 #!/bin/bash -e
+required_minor_version=19
+
 cd $(dirname "$0")
 
-echo "Checking for go..."
+echo "Checking for go v1.$required_minor_version..."
 if ! command -v go &> /dev/null
 then
   echo "Could not find go. Make sure it is installed and in your path."
   echo "https://golang.org/dl/"
   exit 1
 fi
 
+go_version=$(go version | awk '{print $3}' | sed 's/^go//')
+major_version=$(echo "$go_version" | cut -f1 -d.)
+minor_version=$(echo "$go_version" | cut -f2 -d.)
+if [[ "$major_version" -lt 1 || ( "$major_version" -eq 1 && "$minor_version" -lt "$required_minor_version" ) ]]; then
+  echo "Need go version 1.$required_minor_version, you have $go_version. Please upgrade."
+  echo "https://golang.org/dl/"
+  exit 1
+fi
+
 echo "Checking for mage..."
 if ! command -v mage &> /dev/null
 then
   echo "Could not find mage. Installing..."
   ./reinstall-mage.sh
 fi
 
-echo "All dependancies are installed."
+echo "All dependencies are installed."