Use rpm.spawn instead of posix.fork if availabe (#2291869)

glibc.spec

@@ -99,6 +99,13 @@
 
 -- Open-code rpm.execute with error message handling.
 function post_exec (msg, program, ...)
+  if rpm.spawn ~= nil then
+    local status = rpm.spawn ({program, ...})
+    if status == nil then
+      io.stdout:write (msg)
+      assert (nil)
+    end
+  else
     local pid = posix.fork ()
     if pid == 0 then
       posix.exec (program, ...)
@@ -108,6 +115,7 @@ function post_exec (msg, program, ...)
       posix.wait (pid)
     end
   end
+end
 
 function call_ldconfig ()
   post_exec("Error: call to ldconfig failed.\n",
@@ -144,7 +152,7 @@ Version: %{glibcversion}
 # - It allows using the Release number without the %%dist tag in the dependency
 #   generator to make the generated requires interchangeable between Rawhide
 #   and ELN (.elnYY < .fcXX).
-%global baserelease 14
+%global baserelease 15
 Release: %{baserelease}%{?dist}
 
 # Licenses:
@@ -2122,6 +2130,10 @@ update_gconv_modules_cache()
 if tonumber(arg[2]) >= 2
    and posix.access("%{_prefix}/bin/systemctl", "x")
 then
+  if rpm.spawn ~= nil then
+    rpm.spawn ({"%{_prefix}/bin/systemctl", "daemon-reexec"},
+               {stderr="/dev/null"})
+  else
     local pid = posix.fork()
     if pid == 0 then
       posix.redirect2null(2)
@@ -2130,6 +2142,7 @@ then
       posix.wait(pid)
     end
   end
+end
 
 %posttrans all-langpacks -e -p <lua>
 -- The old glibc-all-langpacks postun scriptlet deleted the locale-archive
@@ -2340,6 +2353,9 @@ update_gconv_modules_cache ()
 %endif
 
 %changelog
+* Mon Oct 28 2024 Florian Weimer <fweimer@redhat.com> - 2.40.9000-15
+- Use rpm.spawn instead of posix.fork if availabe (#2291869)
+
 * Mon Oct 28 2024 Florian Weimer <fweimer@redhat.com> - 2.40.9000-14
 - Eliminate the glibc-headers package