Merge pull request #34 from upbound/backport-18-to-release-0.2

[Backport release-0.2] Fix: switch back to TF_ prefixes for opentofu env vars

Author: turkenf

cluster/images/provider-opentofu/Dockerfile

@@ -5,7 +5,7 @@ ARG TARGETARCH
 
 ENV OPENTOFU_VERSION=1.9.0
 ENV TF_IN_AUTOMATION=1
-ENV TOFU_PLUGIN_CACHE_DIR=/tofu/plugin-cache
+ENV TF_PLUGIN_CACHE_DIR=/tofu/plugin-cache
 
 ADD "bin/${TARGETOS}_${TARGETARCH}/provider" /usr/local/bin/crossplane-opentofu-provider
 ADD .gitconfig .gitconfig
@@ -14,7 +14,7 @@ RUN curl -s -L https://github.com/opentofu/opentofu/releases/download/v${OPENTOF
   && unzip -d /usr/local/bin tofu.zip \
   && rm tofu.zip \
   && chmod +x /usr/local/bin/tofu \
-  && mkdir -p ${TOFU_PLUGIN_CACHE_DIR} \
+  && mkdir -p ${TF_PLUGIN_CACHE_DIR} \
   && chown -R 2000 /tofu
 # As of Crossplane v1.3.0 provider controllers run as UID 2000.
 # https://github.com/crossplane/crossplane/blob/v1.3.0/internal/controller/pkg/revision/deployment.go#L32

internal/opentofu/opentofu.go

@@ -177,14 +177,14 @@ func (h Harness) Init(ctx context.Context, o ...InitOption) error {
 	cmd := exec.Command(h.Path, args...) //nolint:gosec
 	cmd.Dir = h.Dir
 	for _, e := range os.Environ() {
-		if strings.Contains(e, "TOFU_PLUGIN_CACHE_DIR") {
+		if strings.Contains(e, "TF_PLUGIN_CACHE_DIR") {
 			if !h.UsePluginCache {
 				continue
 			}
 		}
 		cmd.Env = append(cmd.Env, e)
 	}
-	cmd.Env = append(cmd.Env, "TOFU_CLI_CONFIG_FILE=./.tofurc")
+	cmd.Env = append(cmd.Env, "TF_CLI_CONFIG_FILE=./.tofurc")
 	if len(h.Envs) > 0 {
 		cmd.Env = append(cmd.Env, h.Envs...)
 	}