+if ! command -v btrbk &>/dev/null; then
+ die "error: no btrbk binary found"
+fi
+
+
+#### end pre-checks #####
+
+mkdir -p /var/log/btrbk
+# The journal doesnt go back to my oldest backups, and I've found myself
+# wanting older logs. Not going to bother expiring old logs, since it is
+# fine if they go back years.
+log_path=/var/log/btrbk/$(date +%F_%T%:::z).log
+echo copying output to $log_path
+exec &> >(ts "%F %T" | tee -a $log_path)
+
+
+if $verbose; then
+ printf " options: conf_only=%s\ndry_run=%s\nrate_limit=%s\nverbose=%s\ncmd_arg=%s" "$conf_only" "$dry_run" "$rate_limit" "$verbose" "$cmd_arg"
+fi
+
+if [[ -v targets ]]; then
+ echo "targets: ${targets[*]}"
+fi
+
+if [[ $source ]]; then
+ echo "source: $source"
+fi
+
+echo "mountpoints: ${mountpoints[*]}"
+
+
+uninstalled-file-die() {
+ err "uninstalled file $1. run install-my-scripts or rerun with -f"
+ exit 1
+}
+if ! $force; then
+ install_bin_files=(
+ mount-latest-subvol
+ check-subvol-stale
+ btrbk-run
+ )
+ for f in ${install_bin_files[@]}; do
+ if ! diff -q /a/bin/ds/$f /usr/local/bin/$f; then
+ uninstalled-file-die $f
+ fi
+ done
+ if ! diff -q /a/bin/errhandle/err /usr/local/lib/err; then
+ uninstalled-file-die err
+ fi
+fi
+
+