[docs] Extend makefile with render-template that ease YAML template rendering for development.

Littly hacky addition of a render-template method in order to verify and rapidly iterate development of new talm templating functionnalities. Ass the capacity to pass any parametes the talm template commands.

Signed-off-by: lb0o <lb0o@nocilo.com>

Author: lb0o

Makefile

@@ -54,3 +54,18 @@ import-internal:
 		talos-$(TALOS_VERSION)/internal/pkg
 	rm -rf internal/app/init/ internal/pkg/rng/ internal/pkg/tui/
 	sed -i 's|github.com/siderolabs/talos/internal|github.com/cozystack/talm/internal|g' `grep -rl 'github.com/siderolabs/talos/internal' internal`
+
+render-template: build
+	@echo "Rendering templates..."; \
+	TALM_PATH="`pwd`/talm"; \
+	TMPDIR="`mktemp -d -t talm-tmp.XXXXXX`"; \
+	echo "Initializing template workspace in $$TMPDIR..."; \
+	cd "$$TMPDIR"; \
+	if [ ! -x "$$TALM_PATH" ]; then echo "Error: '$$TALM_PATH' not found or not executable."; exit 127; fi; \
+	"$$TALM_PATH" init --preset cozystack; \
+	echo; echo "--------- Rendering controlplane.yaml template ---------"; \
+	"$$TALM_PATH" template -t templates/controlplane.yaml --offline $(SET_ARGS); \
+	echo; echo "--------- Rendering worker.yaml template ---------"; \
+	"$$TALM_PATH" template -t templates/worker.yaml --offline $(SET_ARGS); \
+	echo "--------- controlplane and worker template rendering complete ---------"; \
+	rm -rf "$$TMPDIR"

README.md

@@ -58,8 +58,13 @@ talm -n 1.2.3.4 -e 1.2.3.4 template -t templates/controlplane.yaml -i > nodes/no
 
 If you are testing template rendering you can pass the flag --offline. Also using the --full flag will generate a complete configuration, usefull for testing proper rendering of the templates.
 ```bash
-talm template -t templates/controlplane.yaml --full -i > nodes/cp1.yaml --offline
-talm template -t templates/worker.yaml --full -i > nodes/worker1.yaml --offline
+talm template -t templates/controlplane.yaml --offline --full -i > nodes/cp1.yaml
+talm template -t templates/worker.yaml --offline --full -i > nodes/worker1.yaml
+```
+
+To develop and extend templates capabilities of talm you can use make render-template to render templates offline and check the output:
+```bash
+make render-template SET_ARGS="--set kubespan=false --full"
 ```
 
 Edit `nodes/node1.yaml` file: