Add extra ssh config + keys

ssh_extra_keys/generate_keypair.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if [ "${1:-}" = "-h" ] || [ "${1:-}" = "--help" ] || [ $# -ne 1 ]; then
+  declare -r ARGV0=$(basename "${0:-generate-keypair.sh}")
+  printf 'Usage: %s SERVICE_NAME\n' "$ARGV0" >&2
+  cat <<'EOF' >&2
+Generate a new keypair for use in backup targets
+
+Options:
+  -h, --help        Show this help and exit
+  SERVICE_NAME      The name of the service to generate a backup key for. Should not contain spaces.
+
+Example usage:
+  # Generate a new keypair for backuping some service 'my-service' state via rsync
+  generate-keypair.sh my-service
+
+EOF
+  exit 1
+fi
+
+declare -r PROJECT_ROOT="$(git rev-parse --show-toplevel)"
+declare -r KEYPATH="$PROJECT_ROOT/ssh_extra_keys/id_ed25519_$1_rsync_backup"
+
+if [[ -f "$KEYPATH" ]]; then
+  printf "$KEYPATH already exists...\n" >&2
+  exit 1
+fi
+
+ssh-keygen -t ed25519 -b 4096 -C "$1 rsync backup" -f "$KEYPATH" -N ''