add support for non-interactive usage

a small change to allow the script to work in non-interactive contexts by allowing the values that would be read from STDIN to be provided by environment, and falling back to the previous behaviour when undefined.

Signed-off-by: Chris Olstrom <[email protected]>

hack/prepare.sh

@@ -1,10 +1,10 @@
 #!/usr/bin/env bash
 set -euox pipefail
 
-read -r -p "Lower case provider name (ex. github): " PROVIDER_NAME_LOWER
-read -r -p "Normal case provider name (ex. GitHub): " PROVIDER_NAME_NORMAL
-read -r -p "Organization (ex. upbound, my-org-name): " ORGANIZATION_NAME
-read -r -p "CRD rootGroup (ex. upbound.io, crossplane.io): " CRD_ROOT_GROUP
+: ${PROVIDER_NAME_LOWER:=$(read -r -p "Lower case provider name (ex. github): " PROVIDER_NAME_LOWER; echo -n "${PROVIDER_NAME_LOWER}")}
+: ${PROVIDER_NAME_NORMAL:=$(read -r -p "Normal case provider name (ex. GitHub): " PROVIDER_NAME_NORMAL; echo -n "${PROVIDER_NAME_NORMAL}")}
+: ${ORGANIZATION_NAME:=$(read -r -p "Organization (ex. upbound, my-org-name): " ORGANIZATION_NAME; echo -n "${ORGANIZATION_NAME}")}
+: ${CRD_ROOT_GROUP:=$(read -r -p "CRD rootGroup (ex. upbound.io, crossplane.io): " CRD_ROOT_GROUP; echo -n "${CRD_ROOT_GROUP}")}
 
 REPLACE_FILES='./* ./.github :!build/** :!go.* :!hack/prepare.sh'
 # shellcheck disable=SC2086
@@ -37,4 +37,4 @@ git mv "cluster/images/upjet-provider-template" "cluster/images/provider-${PROVI
 # generate: open /Users/hasanturken/Workspace/crossplane-contrib/upjet-provider-template/apis/null/v1alpha1/zz_generated.deepcopy.go: no such file or directory
 rm -rf apis/null
 # remove the sample directory which was a configuration in the template
-rm -rf config/null
+rm -rf config/null