Split Makefile variables into a separate file

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

Variables.mk

@@ -0,0 +1,99 @@
+-include Defaults.mk
+
+# Linux distro (try and set to /etc/os-release ID)
+OS_REL := $(shell sed -n "s/^ID\s*=\s*['"\""]\(.*\)['"\""]/\1/p" /etc/os-release)
+OS ?= $(OS_REL)
+
+# List of variables to save and replace in files
+VARLIST := OS
+
+# Project Information
+VARLIST += WAREWULF VERSION RELEASE
+WAREWULF ?= warewulf
+VERSION ?= 4.4.0
+GIT_TAG := $(shell test -e .git && git log -1 --format="%h")
+
+ifdef GIT_TAG
+  ifdef $(filter $(OS),ubuntu debian)
+    RELEASE ?= 1.git_$(subst -,+,$(GIT_TAG))
+  else
+    RELEASE ?= 1.git_$(subst -,_,$(GIT_TAG))
+  endif
+else
+  RELEASE ?= 1
+endif
+
+# Use LSB-compliant paths if OS is known
+ifneq ($(OS),)
+  USE_LSB_PATHS := true
+endif
+
+# Always default to GNU autotools default paths if PREFIX has been redefined
+ifdef PREFIX
+  USE_LSB_PATHS := false
+endif
+
+# System directory paths
+VARLIST += PREFIX BINDIR SYSCONFDIR SRVDIR DATADIR MANDIR DOCDIR LOCALSTATEDIR
+PREFIX ?= /usr/local
+BINDIR ?= $(PREFIX)/bin
+SYSCONFDIR ?= $(PREFIX)/etc
+DATADIR ?= $(PREFIX)/share
+MANDIR ?= $(DATADIR)/man
+DOCDIR ?= $(DATADIR)/doc
+
+ifeq ($(USE_LSB_PATHS),true)
+  SRVDIR ?= /srv
+  LOCALSTATEDIR ?= /var/local
+else
+  SRVDIR ?= $(PREFIX)/srv
+  LOCALSTATEDIR ?= $(PREFIX)/var
+endif
+
+# OS-Specific Service Locations
+VARLIST += TFTPDIR FIREWALLDDIR SYSTEMDDIR BASHCOMPDIR
+SYSTEMDDIR ?= /usr/lib/systemd/system
+BASHCOMPDIR ?= /etc/bash_completion.d
+FIREWALLDDIR ?= /usr/lib/firewalld/services
+ifeq ($(OS),suse)
+  TFTPDIR ?= /srv/tftpboot
+endif
+ifeq ($(OS),ubuntu)
+  TFTPDIR ?= /srv/tftp
+endif
+# Default to Red Hat / Rocky Linux
+TFTPDIR ?= /var/lib/tftpboot
+
+# Warewulf directory paths
+VARLIST += WWCLIENTDIR WWCONFIGDIR WWPROVISIONDIR WWOVERLAYDIR WWCHROOTDIR WWTFTPDIR WWDOCDIR WWDATADIR
+WWCONFIGDIR := $(SYSCONFDIR)/$(WAREWULF)
+WWPROVISIONDIR := $(SRVDIR)/$(WAREWULF)
+WWOVERLAYDIR := $(LOCALSTATEDIR)/$(WAREWULF)/overlays
+WWCHROOTDIR := $(LOCALSTATEDIR)/$(WAREWULF)/chroots
+WWTFTPDIR := $(TFTPDIR)/$(WAREWULF)
+WWDOCDIR := $(DOCDIR)/$(WAREWULF)
+WWDATADIR := $(DATADIR)/$(WAREWULF)
+WWCLIENTDIR ?= /warewulf
+
+# auto installed tooling
+TOOLS_DIR := .tools
+TOOLS_BIN := $(TOOLS_DIR)/bin
+CONFIG := $(shell pwd)
+
+# tools
+GO_TOOLS_BIN := $(addprefix $(TOOLS_BIN)/, $(notdir $(GO_TOOLS)))
+GO_TOOLS_VENDOR := $(addprefix vendor/, $(GO_TOOLS))
+GOLANGCI_LINT := $(TOOLS_BIN)/golangci-lint
+GOLANGCI_LINT_VERSION := v1.53.2
+
+# helper functions
+godeps=$(shell go list -deps -f '{{if not .Standard}}{{ $$dep := . }}{{range .GoFiles}}{{$$dep.Dir}}/{{.}} {{end}}{{end}}' $(1) | sed "s%${PWD}/%%g")
+WWCTL_DEPS:=$(call godeps,cmd/wwctl/main.go)
+WWCLIENT_DEPS:=$(call godeps,cmd/wwclient/main.go)
+
+# use GOPROXY for older git clients and speed up downloads
+GOPROXY ?= https://proxy.golang.org
+export GOPROXY
+
+# built tags needed for wwbuild binary
+WW_GO_BUILD_TAGS := containers_image_openpgp containers_image_ostree