From 6cc3dd2648af19a110872b09eddb58b775e38b2a Mon Sep 17 00:00:00 2001
From: Ueda Naoaki <nao@uedder.com>
Date: Wed, 1 Feb 2023 22:13:58 +0900
Subject: Refactoring a process to install

---
 .gitignore |  2 ++
 Makefile   | 25 +++++++++++++++----------
 2 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/.gitignore b/.gitignore
index f740898..a6302f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,5 @@ custom.mk
 S??tailscale
 tailscale
 tailscaled
+ver
+downloaded
diff --git a/Makefile b/Makefile
index 7f78c8a..590996a 100644
--- a/Makefile
+++ b/Makefile
@@ -25,18 +25,23 @@ install: tailscaled tailscale install.sh | $(init_file)
 $(init_file): SXXtailscale.template
 	cp -a $< $@
 
-tailscale tailscaled: $(tailscale.tgz)
-	tar --strip-components 1 -xmvzf $< $(basename $<)/$@
+tailscale tailscaled: downloaded
+	tar --strip-components 1 -xmvzf $(tailscale.tgz) $(basename $(tailscale.tgz))/$@
 
-$$(tailscale.tgz):
+ver:
+	curl -s https://api.github.com/repos/tailscale/tailscale/releases/latest | perl -nle '/"name":\s*"(.+)"/ and print $$1' > $@
+
+.PHONY: ver-updated
+ver-updated:
+	$(MAKE) --always-make ver
+
+TGZ_URL = https://pkgs.tailscale.com/stable/tailscale_$(shell cat ver 2> /dev/null || printf '<ver>')_arm64.tgz
+tailscale.tgz = $(notdir $(TGZ_URL))
+
+downloaded: ver
 	curl -L $(TGZ_URL) -O
+	touch $@
 
 .PHONY: clean
 clean:
-	rm -f *.tgz $(init_file) tailscale tailscaled
-
-.SECONDEXPANSION:
-# default is latest
-VER ?= $(shell curl -s https://api.github.com/repos/tailscale/tailscale/releases/latest | perl -nle '/"name":\s*"(.+)"/ and print $$1')
-TGZ_URL = https://pkgs.tailscale.com/stable/tailscale_$(VER)_arm64.tgz
-tailscale.tgz = $(notdir $(TGZ_URL))
+	rm -f *.tgz $(init_file) tailscale tailscaled ver downloaded
-- 
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