Closes: https://bugs.gentoo.org/876658
Signed-off-by: Florian Schmaus <f...@gentoo.org>
---
 eclass/systemd.eclass | 44 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/eclass/systemd.eclass b/eclass/systemd.eclass
index fbed387e0ca0..03d6a82fd310 100644
--- a/eclass/systemd.eclass
+++ b/eclass/systemd.eclass
@@ -1,4 +1,4 @@
-# Copyright 2011-2022 Gentoo Authors
+# Copyright 2011-2023 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: systemd.eclass
@@ -227,6 +227,48 @@ systemd_install_serviced() {
        )
 }
 
+# @FUNCTION: systemd_install_dropin
+# @USAGE: [--user] <unit> <conf-file>
+# @DESCRIPTION:
+# Install <conf-file> as the dropin file <unit>.d/00gentoo.conf,
+# overriding the settings of <unit>.
+# Defaults to system unit dropins, unless --user is provided,
+# which causes the dropin to be installed for user units.
+# The required argument <conf-file> may be '-', in which case the
+# file is read from stdin and <unit> must also be specified.
+# @EXAMPLE:
+# systemd_install_dropin foo.service "${FILESDIR}/foo.service.conf"
+# systemd_install_dropin foo.service - <<-EOF
+#      [Service]
+#      RestartSec=120
+# EOF
+systemd_install_dropin() {
+       debug-print-function ${FUNCNAME} "${@}"
+
+       local basedir
+       if [[ $# -ge 1 ]] && [[ $1 == "--user" ]]; then
+               basedir=$(_systemd_unprefix systemd_get_userunitdir)
+               shift 1
+       else
+               basedir=$(_systemd_unprefix systemd_get_systemunitdir)
+       fi
+
+       local unit=${1}
+       local src=${2}
+
+       [[ ${unit} ]] || die "No unit specified"
+       [[ ${src} ]] || die "No conf file specified"
+
+       # avoid potentially common mistake
+       [[ ${unit} == *.d ]] && die "Unit ${unit} must not have .d suffix"
+
+       (
+               insopts -m 0644
+               insinto "${basedir}/${unit}".d
+               newins "${src}" 00gentoo.conf
+       )
+}
+
 # @FUNCTION: systemd_enable_service
 # @USAGE: <target> <service>
 # @DESCRIPTION:
-- 
2.41.0


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