From 5ca33b525b56f0e255e2e3bb35441b78b23aee4a Mon Sep 17 00:00:00 2001
From: Kerin Millar <kfm@plushkava.net>
Date: Wed, 12 Jun 2024 06:41:22 +0100
Subject: Add the from_unit() function

The function determines whether the current shell is a subprocess of a
systemd unit that handles a service, socket, mount point or swap device,
per systemd.exec(5).

Signed-off-by: Kerin Millar <kfm@plushkava.net>
---
 functions.sh | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/functions.sh b/functions.sh
index 605aa48..7d146c8 100644
--- a/functions.sh
+++ b/functions.sh
@@ -324,6 +324,15 @@ from_runscript()
 	has_openrc && test "${RC_OPENRC_PID}"
 }
 
+#
+# Determines whether the current shell is a subprocess of a systemd unit that
+# handles a service, socket, mount point or swap device, per systemd.exec(5).
+#
+from_unit()
+{
+	has_systemd && test "${SYSTEMD_EXEC_PID}" && test "${INVOCATION_ID}"
+}
+
 #
 # Determines whether the kernel cmdline contains the specified parameter as a
 # component of a comma-separated list specified in the format of gentoo=<list>.
-- 
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