[PATCH] systemd: Allow overriding PNI name policies

[Stefan Eichenberger <eichest@gmail.com>]

From: Stefan Eichenberger <stefan.eichenberger@toradex.com>

Add two new variables, PNI_NAME_POLICY and PNI_ALTNAMES_POLICY, to allow
overriding the default Predictable Network Interface (PNI) name and
alternative name policies respectively.

This allows setting different name policies via a .bbappend file if the
defaults are not suitable for a specific use case.

Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
---
 meta/recipes-core/systemd/systemd_257.4.bb | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/meta/recipes-core/systemd/systemd_257.4.bb b/meta/recipes-core/systemd/systemd_257.4.bb
index 24aad11c0a..00edd702fb 100644
--- a/meta/recipes-core/systemd/systemd_257.4.bb
+++ b/meta/recipes-core/systemd/systemd_257.4.bb
@@ -273,6 +273,10 @@ WATCHDOG_TIMEOUT ??= "60"
 # and the watchdog is enabled. (defaults is no hardware watchdog use)
 WATCHDOG_RUNTIME_SEC ??= ""
 
+# Predictable network interface name policies
+PNI_NAME_POLICY ??= "keep kernel database onboard slot path mac"
+PNI_ALTERNATIVE_NAMES_POLICY ??= "database onboard slot path mac"
+
 do_install() {
 	meson_do_install
 
@@ -398,12 +402,8 @@ do_install() {
 	fi
 
 	if ${@bb.utils.contains('PACKAGECONFIG', 'pni-names', 'true', 'false', d)}; then
-		if ! grep -q '^NamePolicy=.*mac' ${D}${nonarch_libdir}/systemd/network/99-default.link; then
-			sed -i '/^NamePolicy=/s/$/ mac/' ${D}${nonarch_libdir}/systemd/network/99-default.link
-		fi
-		if ! grep -q 'AlternativeNamesPolicy=.*mac' ${D}${nonarch_libdir}/systemd/network/99-default.link; then
-			sed -i '/AlternativeNamesPolicy=/s/$/ mac/' ${D}${nonarch_libdir}/systemd/network/99-default.link
-		fi
+		sed -i 's/^NamePolicy=.*/NamePolicy=${PNI_NAME_POLICY}/' ${D}${nonarch_libdir}/systemd/network/99-default.link
+		sed -i 's/^AlternativeNamesPolicy=.*/AlternativeNamesPolicy=${PNI_ALTERNATIVE_NAMES_POLICY}/' ${D}${nonarch_libdir}/systemd/network/99-default.link
 	else
 		# Actively disable Predictable Network Interface Names
 		sed -i 's/^NamePolicy=.*/NamePolicy=/;s/^AlternativeNamesPolicy=.*/AlternativeNamesPolicy=/' ${D}${nonarch_libdir}/systemd/network/99-default.link
-- 
2.45.2