update the codebase and clean up it

install_dockor.sh

@@ -0,0 +1,36 @@
+# everything stays under $SCRATCH
+export DROOT="$SCRATCH/docker-rootless"
+mkdir -p "$DROOT"/{bin,home,config/docker,run,data}
+chmod 700 "$DROOT/run"
+
+# read-only checks; these do not modify the system
+command -v newuidmap newgidmap
+grep "^$(whoami):" /etc/subuid /etc/subgid
+cat /proc/sys/kernel/unprivileged_userns_clone 2>/dev/null || true
+cat /proc/sys/user/max_user_namespaces 2>/dev/null || true
+df -T "$SCRATCH"
+
+# keep Docker files in $SCRATCH
+export HOME="$DROOT/home"
+export DOCKER_BIN="$DROOT/bin"
+export XDG_CONFIG_HOME="$DROOT/config"
+export XDG_RUNTIME_DIR="$DROOT/run"
+export PATH="$DOCKER_BIN:$PATH"
+export DOCKER_HOST="unix://$XDG_RUNTIME_DIR/docker.sock"
+
+# install rootless Docker binaries into $SCRATCH
+curl -fsSL https://get.docker.com/rootless | sh
+
+# store Docker images/layers in $SCRATCH too
+cat > "$XDG_CONFIG_HOME/docker/daemon.json" <<EOF
+{
+  "data-root": "$DROOT/data"
+}
+EOF
+
+# start daemon manually (no systemd)
+nohup dockerd-rootless.sh > "$DROOT/dockerd.log" 2>&1 &
+sleep 5
+
+docker --version
+docker info