Merge pull request #1989 from keszybz/filetriggers-v2

Return of the file triggers

src/core/triggers.systemd.in

@@ -19,8 +19,46 @@
 
 # The contents of this are an example to be copied into systemd.spec.
 
-%transfiletriggerin -- @systemunitdir@ /etc/systemd/system
-systemctl daemon-reload &>/dev/null || :
+%transfiletriggerin -P 900900 -p <lua> -- @systemunitdir@ /etc/systemd/system
+-- This script will run after any package is initially installed or
+-- upgraded. We care about the case where a package is initially
+-- installed, because other cases are covered by the *un scriptlets,
+-- so sometimes we will reload needlessly.
 
-%transfiletriggerun -- @systemunitdir@ /etc/systemd/system
-systemctl daemon-reload &>/dev/null || :
+pid = posix.fork()
+if pid == 0 then
+    assert(posix.exec("%{_bindir}/systemctl", "daemon-reload"))
+elseif pid > 0 then
+    posix.wait(pid)
+end
+
+%transfiletriggerun -p <lua> -- @systemunitdir@ /etc/systemd/system
+-- On removal, we need to run daemon-reload after any units have been
+-- removed. %transfiletriggerpostun would be ideal, but it does not get
+-- executed for some reason.
+-- On upgrade, we need to run daemon-reload after any new unit files
+-- have been installed, but before %postun scripts in packages get
+-- executed. %transfiletriggerun gets the right list of files
+-- but it is invoked too early (before changes happen).
+-- %filetriggerpostun happens at the right time, but it fires for
+-- every package.
+-- To execute the reload at the right time, we create a state
+-- file in %transfiletriggerun and execute the daemon-reload in
+-- the first %filetriggerpostun.
+
+posix.mkdir("%{_localstatedir}/lib")
+posix.mkdir("%{_localstatedir}/lib/rpm-state")
+posix.mkdir("%{_localstatedir}/lib/rpm-state/systemd")
+io.open("%{_localstatedir}/lib/rpm-state/systemd/needs-reload", "w")
+
+%filetriggerpostun -P 1000100 -p <lua> -- @systemunitdir@ /etc/systemd/system
+if posix.access("%{_localstatedir}/lib/rpm-state/systemd/needs-reload") then
+    posix.unlink("%{_localstatedir}/lib/rpm-state/systemd/needs-reload")
+    posix.rmdir("%{_localstatedir}/lib/rpm-state/systemd")
+    pid = posix.fork()
+    if pid == 0 then
+        assert(posix.exec("%{_bindir}/systemctl", "daemon-reload"))
+    elseif pid > 0 then
+        posix.wait(pid)
+    end
+end