Restore compatibility with RPM 4.16

I have made the decision to restore compatibility with EL 9 and pause
efforts in https://todo.sr.ht/~gotmax23/forge-srpm-macros/3 to continue
adopting new RPM 4.17+ features.

Packagers have requested the ability to use %forgeversion on EL 9, and
we need to support it for tools like Packit and Zuul CI that build SRPMs
in CentOS Stream containers to be able to adopt it.

Relates: https://todo.sr.ht/~gotmax23/forge-srpm-macros/3

.builds/9.yml

@@ -4,7 +4,7 @@
 
 # NOTICE: This file is generated from ci.yml.in. Do not edit!
 
-image: fedora/37
+image: rockylinux/9
 packages:
   - python3-pytest
   - python3-pyyaml

README.md

@@ -28,13 +28,8 @@ This code has been split out from redhat-rpm-config to ease maintenance.
 
 ## Compatibility
 
-Fedora 37 / RPM 4.18 and above are tested in CI.
-
-These macros do not yet use any RPM 4.18+ features,
-but [there are plans][4.17] to adopt newer RPM features that are not available
-on older distributions like EL 9.
-
-[4.17]: https://todo.sr.ht/~gotmax23/forge-srpm-macros/3
+The minimum supported RPM version is 4.16. The macros are tested in CI on
+Fedora 38+ and EL 9.
 
 ## Contributing
 

cigen.sh

@@ -4,7 +4,7 @@
 
 set -euo pipefail
 
-for i in fedora/37 fedora/38 fedora/39; do
+for i in rockylinux/9 fedora/38 fedora/39; do
     file=".builds/$(echo $i | cut -d/ -f2).yml"
     sed "s|@@IMAGE@@|$i|" ci.yml.in >$file
 done

rpm/lua/fedora/srpm/forge.lua

@@ -103,6 +103,7 @@ end
 -- Also called directly by gometa
 local function meta(suffix, verbose, informative, silent)
   local fedora = require "fedora.common"
+  local util = require "fedora.srpm._forge_util"
   local ismain = (suffix == "") or (suffix == "0")
   if ismain then
     fedora.zalias({"forgeurl", "forgesource", "forgesetupargs",
@@ -210,7 +211,7 @@ local function meta(suffix, verbose, informative, silent)
            forgeurl = expliciturl
   end
   local forge
-  forgeurl,   forge = idforge(forgeurl, silent, macros["forgename" .. suffix])
+  forgeurl,   forge = idforge(forgeurl, silent, util.get_macro("forgename" .. suffix))
   if (forge ~= nil) then
     fedora.explicitset("forgeurl" .. suffix, forgeurl, verbose)
     fedora.explicitset("forgename" .. suffix, forge, verbose)

rpm/macros.d/macros.forge

@@ -98,53 +98,55 @@ print(rpm.expand("%autosetup %{-v} %{-N} %{?-S} %{?-p} %{?forgesetupargs" .. rpm
 #   Version: %{forgeversion}
 
 %forgeversion(pz:ab:) %{lua:
--- Zero-alias version/version0 macros
 local fedora = require "fedora.common"
+local util = require "fedora.srpm._forge_util"
+\
+-- Zero-alias version/version0 macros
 fedora.zalias({"version", "distprefix", "_forgeversionsuffix"}, nil)
-
+\
 -- Determine the seperator
 local sep = "^"
-if opt.p then
+if util.get_flag("p") then
     sep = "~"
 end
-
+\
 -- Release uses %dist and %distprefix, so we need to make sure it's not used before
-if macros.release then
+if util.is_defined("release") then
     rpm.expand(
       "%{error:'Version: %%forgeversion' must be invoked before setting Release.}"
     )
 end
-
+\
 -- Determine baseversion
-local baseversion = opt.b or macros.version0
+local baseversion = util.get_flag("b", true) or util.get_macro("version0")
 if not baseversion then
   rpm.expand(
     "%{error:You must define %%version0" ..
     " (%%global version0 <VERSION>) prior to invoking this macro.}"
   )
 end
-
+\
 -- Concatenate parts. Clear out %distprefix* to avoid duplicating data in Release.
 -- forgemeta stores the same values in _forgeversionsuffix so we can run
 -- forgeversion multiple times.
 local part = ""
 rpm.undefine("distprefix")
-if opt.a then
+if util.get_flag("a") then
   for i=0,9999 do
-    local curpart = macros["_forgeversionsuffix" .. i]
+    local curpart = util.get_macro("_forgeversionsuffix" .. i)
     if curpart then
       part = part .. curpart
     end
     rpm.undefine("distprefix" .. i)
   end
 else
-  local i = opt.z or ""
-  part = part .. (macros["_forgeversionsuffix" .. i] or "")
+  local i = util.get_flag("z", true) or ""
+  part = part .. (util.get_macro("_forgeversionsuffix" .. i) or "")
 end
-
+\
 -- Strip any leading '.'
 part = part:gsub("^%.", "")
-
+\
 -- Print final version
 if part ~= "" then
   print(baseversion .. sep .. part)