From bb17ee2b2539df5fdb4f5c7ed360e5061c188f6e Mon Sep 17 00:00:00 2001
From: Freya Murphy <freya@freyacat.org>
Date: Fri, 11 Apr 2025 23:22:53 -0400
Subject: openrc

---
 openrc/Dockerfile    | 18 ++++++++++++++++++
 openrc/entrypoint.sh | 12 ++++++++++++
 openrc/wait.initd    |  4 ++++
 3 files changed, 34 insertions(+)
 create mode 100644 openrc/Dockerfile
 create mode 100755 openrc/entrypoint.sh
 create mode 100755 openrc/wait.initd

diff --git a/openrc/Dockerfile b/openrc/Dockerfile
new file mode 100644
index 0000000..49f32cb
--- /dev/null
+++ b/openrc/Dockerfile
@@ -0,0 +1,18 @@
+FROM alpine:3.21
+
+# install packages
+RUN apk add --no-cache openrc udev-init-scripts-openrc
+
+# setup openrc
+COPY ./wait.initd /etc/init.d/wait
+RUN sed -i 's/#rc_sys=""/rc_sys="docker"/' /etc/rc.conf && \
+  rc-update add wait
+
+# remove last run
+RUN rm -rf /run/openrc 2>/dev/null
+RUN mkdir /run/openrc
+RUN touch /run/openrc/softlevel
+
+# start openrc
+COPY ./entrypoint.sh /sbin/entrypoint
+ENTRYPOINT ["/sbin/entrypoint"]
diff --git a/openrc/entrypoint.sh b/openrc/entrypoint.sh
new file mode 100755
index 0000000..ac20887
--- /dev/null
+++ b/openrc/entrypoint.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+if [ "$#" = "0" ]; then
+  step "Starting OpenRC"
+  rm -rf /run/openrc 2>/dev/null
+  mkdir /run/openrc
+  touch /run/openrc/softlevel
+  exec -a /sbin/openrc /sbin/openrc
+else
+  "$@"
+fi
+
diff --git a/openrc/wait.initd b/openrc/wait.initd
new file mode 100755
index 0000000..b033ac1
--- /dev/null
+++ b/openrc/wait.initd
@@ -0,0 +1,4 @@
+#!/sbin/openrc-run
+# this container may need openrc to keep running without any services
+# ordinarily that would cause it to stop, so this is a dummy service
+start(){ sleep infinity & }
-- 
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