collect reusable code

shared/configure-nested-container.sh

@@ -0,0 +1,39 @@
+#!/bin/sh
+
+# Copy & modify the defaults to provide reference if runtime changes needed.
+# Changes here are required for running with fuse-overlay storage inside container.
+sed -e 's|^#mount_program|mount_program|g' \
+    -e '/additionalimage.*/a "/var/lib/shared",' \
+    -e 's|^mountopt[[:space:]]*=.*$|mountopt = "nodev,fsync=0"|g' \
+    /usr/share/containers/storage.conf \
+    > /etc/containers/storage.conf && \
+    chmod 644 /etc/containers/storage.conf && \
+    chmod 644 /etc/containers/containers.conf
+
+mkdir -p /var/lib/shared/overlay-images \
+    /var/lib/shared/overlay-layers \
+    /var/lib/shared/vfs-images \
+    /var/lib/shared/vfs-layers && \
+    touch /var/lib/shared/overlay-images/images.lock && \
+    touch /var/lib/shared/overlay-layers/layers.lock && \
+    touch /var/lib/shared/vfs-images/images.lock && \
+    touch /var/lib/shared/vfs-layers/layers.lock
+
+# Define uid/gid ranges for our user https://github.com/containers/buildah/issues/3053
+useradd action && \
+    echo -e "action:1:999\action:1001:64535" > /etc/subuid && \
+    echo -e "action:1:999\action:1001:64535" > /etc/subgid && \
+    mkdir -p /home/action/.local/share/containers && \
+    mkdir -p /home/action/.config/containers && \
+    chown -R action:action /home/action
+
+# See:  https://github.com/containers/buildah/issues/4669
+# Copy & modify the config for the `action` user and remove the global
+# `runroot` and `graphroot` which current `actuib` user cannot access,
+# in such case storage will choose a runroot in `/var/tmp`.
+sed -e 's|^#mount_program|mount_program|g' \
+        -e 's|^graphroot|#graphroot|g' \
+        -e 's|^runroot|#runroot|g' \
+        /etc/containers/storage.conf \
+        > /home/action/.config/containers/storage.conf && \
+        chown action:action /home/action/.config/containers/storage.conf