Support universal mod package install

Author: thespad

root/etc/s6-overlay/s6-rc.d/init-mods-end/dependencies.d/init-mods-package-install

@@ -0,0 +1,35 @@
+#!/usr/bin/with-contenv bash
+
+if [ -f "/mod-repo-packages-to-install.list" ]; then
+    echo "**** Installing all mod packages ****"
+    if [ -f /usr/bin/apt ]; then
+        export DEBIAN_FRONTEND="noninteractive"
+        apt-get update
+        apt-get install -y --no-install-recommends \
+            $(cat /mod-repo-packages-to-install.list)
+    elif [ -f /sbin/apk ]; then
+        apk add --no-cache \
+            $(cat /mod-repo-packages-to-install.list)
+    fi
+fi
+
+if [ -f "/mod-pip-packages-to-install.list" ]; then
+    echo "**** Installing all pip packages ****"
+    python3 -m pip install -U pip wheel setuptools
+    if [ -f /usr/bin/apt ]; then
+        PIP_ARGS="-f https://wheel-index.linuxserver.io/ubuntu/"
+    elif [ -f /sbin/apk ]; then
+        ALPINE_VER=$(grep main /etc/apk/repositories | sed 's|.*alpine/v||' | sed 's|/main.*||')
+        if [ "${ALPINE_VER}" = "3.14" ]; then
+            PIP_ARGS="-f https://wheel-index.linuxserver.io/alpine/"
+        else
+            PIP_ARGS="-f https://wheel-index.linuxserver.io/alpine-${ALPINE_VER}/"
+        fi
+    fi
+    python3 -m pip install ${PIP_ARGS} \
+        $(cat /mod-pip-packages-to-install.list)
+fi
+
+rm -rf \
+    /mod-repo-packages-to-install.list \
+    /mod-pip-packages-to-install.list

root/etc/s6-overlay/s6-rc.d/init-mods-package-install/dependencies.d/init-mods

@@ -0,0 +1 @@
+oneshot

root/etc/s6-overlay/s6-rc.d/init-mods-package-install/run

@@ -0,0 +1 @@
+/etc/s6-overlay/s6-rc.d/init-mods-package-install/run