Naive approach that seems to work with mayohiga

One of the important flaws is that if one of the intended services will
not run, then shutdown may not happen at all. With current mayohiga
setup this will not happen but it may break in any other case.

7 files changed, 76 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..92389d9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.service
+*.target.8
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..9984122
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,39 @@
+DESTDIR=
+PREFIX=/usr/local
+LIBEXECDIR=$(PREFIX)/libexec
+LIBDIR=$(PREFIX)/lib
+SYSDDIR=$(LIBDIR)/systemd/system
+DATADIR=$(PREFIX)/share
+MANDIR=$(DATADIR)/man
+MAN8DIR=$(MANDIR)/man8
+
+
+%: %.in
+	sed "s|@LIBEXECDIR@|$(LIBEXECDIR)|g" $< >$@
+	sed -i "s|@SYSDDIR@|$(SYSDDIR)|g" $@
+
+
+all: shutdown-if-no-sessions.service ready-for-shutdown.target.8
+
+
+install: all
+	install -m644 -Dt $(DESTDIR)$(SYSDDIR) ready-for-shutdown.target
+	install -m644 -Dt $(DESTDIR)$(MAN8DIR) ready-for-shutdown.target.8
+	install -m644 -Dt $(DESTDIR)$(SYSDDIR) shutdown-if-no-sessions.service
+	install -m644 -Dt $(DESTDIR)$(MAN8DIR) shutdown-if-no-sessions.service.8
+	install -m755 -Dt $(DESTDIR)$(LIBEXECDIR) shutdown-if-no-sessions
+
+
+uninstall:
+	rm -f $(DESTDIR)$(SYSDDIR)/ready-for-shutdown.target
+	rm -f $(DESTDIR)$(MAN8DIR)/ready-for-shutdown.target.8
+	rm -f $(DESTDIR)$(SYSDDIR)/shutdown-if-no-sessions.service
+	rm -f $(DESTDIR)$(MAN8DIR)/shutdown-if-no-sessions.service.8
+	rm -f $(DESTDIR)$(BINDIR)/shutdown-if-no-sessions
+
+
+clean:
+	rm -f *.service *.target.8
+
+
+.PHONY: all install uninstall clean
diff --git a/ready-for-shutdown.target b/ready-for-shutdown.target
new file mode 100644
index 0000000..10e8191
--- /dev/null
+++ b/ready-for-shutdown.target
@@ -0,0 +1,5 @@
+[Unit]
+Description=All scheduled timers and builds are done
+Documentation=man:ready-for-shutdown.target(8)
+Before=shutdown-if-no-sessions.service
+Wants=shutdown-if-no-sessions.service
diff --git a/ready-for-shutdown.target.8.in b/ready-for-shutdown.target.8.in
new file mode 100644
index 0000000..babba56
--- /dev/null
+++ b/ready-for-shutdown.target.8.in
@@ -0,0 +1,18 @@
+.TH ready-for-shutdown.target 8 "2024-01-25"
+.SH NAME
+ready-for-shutdown.target, shutdown-if-no-sessions.service - systemd target that marks completion of routine boot tasks
+.SH SYNOPSIS
+.B ready-for-shutdown.target
+.br
+.B shutdown-if-no-sessions.service
+.SH DESCRIPTION
+Target is intended to mark the completion of all scheduled tasks and readiness for shutdown that is triggered
+immediately after. Before enabling this target add
+.B [Install]
+section listing all units that are intended to be run before shutting down.
+.SH FILES
+.I @SYSDDIR@/ready-for-shutdown.target
+.br
+.I @SYSDDIR@/shutdown-if-no-sessions.service
+.br
+.I @LIBEXECDIR@/shutdown-if-no-sessions
diff --git a/shutdown-if-no-sessions b/shutdown-if-no-sessions
new file mode 100755
index 0000000..285eb70
--- /dev/null
+++ b/shutdown-if-no-sessions
@@ -0,0 +1,4 @@
+#!/bin/sh
+if ! who | grep -e tty -e pts; then
+	systemctl poweroff
+fi
diff --git a/shutdown-if-no-sessions.service.8 b/shutdown-if-no-sessions.service.8
new file mode 100644
index 0000000..54b70c1
--- /dev/null
+++ b/shutdown-if-no-sessions.service.8
@@ -0,0 +1 @@
+.so ready-for-shutdown.target.8
diff --git a/shutdown-if-no-sessions.service.in b/shutdown-if-no-sessions.service.in
new file mode 100644
index 0000000..f8d6748
--- /dev/null
+++ b/shutdown-if-no-sessions.service.in
@@ -0,0 +1,7 @@
+[Unit]
+Description=Shutdown if nobody is logged in
+Documentation=man:shutdown-if-no-sessions.service(8)
+
+[Service]
+Type=oneshot
+ExecStart=@LIBEXECDIR@/shutdown-if-no-sessions