Implement manual versioned Synology deployments for S6

deploy/enable-docker.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+# One-time DSM administrator action, run with sudo; does not restart any service.
+set -eu
+test "$(id -u)" = 0 || { echo 'Run this setup with sudo' >&2; exit 1; }
+account=agiledancers-deploy
+docker=/usr/local/bin/docker
+target=/etc/sudoers.d/agiledancers-deploy
+rule="$account ALL=(root) NOPASSWD: $docker"
+test -x "$docker" && id "$account" >/dev/null
+test -d /etc/sudoers.d || { echo 'Missing sudoers.d; no changes made' >&2; exit 1; }
+if [ -e "$target" ]; then
+    test "$(cat "$target")" = "$rule" || { echo 'Existing sudoers entry differs; no changes made' >&2; exit 1; }
+else
+    umask 077
+    temporary=$(mktemp /etc/sudoers.d/agiledancers-deploy.XXXXXX)
+    trap 'rm -f "$temporary"' EXIT
+    printf '%s\n' "$rule" > "$temporary"
+    chmod 440 "$temporary"
+    if command -v visudo >/dev/null 2>&1; then visudo -cf "$temporary"; fi
+    # A dot in the temporary name keeps sudo from loading the uncommitted file.
+    mv "$temporary" "$target"
+    if ! sudo -n -u "$account" sudo -n "$docker" info --format '{{.OSType}}/{{.Architecture}}'; then
+        rm "$target"
+        echo 'Docker permission check failed; new sudoers entry removed' >&2
+        exit 1
+    fi
+fi
+echo 'Dedicated Docker sudo permission is configured; no services were restarted.'