#!/bin/bash
# Keep existing Telegraf command paths pointing at this checkout.
set -euo pipefail
repo=$(cd -- "$(dirname -- "$(readlink -f -- "${BASH_SOURCE[0]}")")" && pwd -P)
target=${1:-/etc/telegraf}
[[ $# -le 1 ]] || { echo "Usage: $0 [telegraf-directory]" >&2; exit 2; }
[[ -d $target && -w $target ]] || {
    echo "Directory must exist and be writable: $target (use sudo for /etc/telegraf)" >&2
    exit 1
}
backup=
staging=$(mktemp -d "$target/.bcachefs-install.XXXXXXXX")
trap 'rm -rf -- "$staging"' EXIT
for source in "$repo"/bcachefs*.sh; do
    name=${source##*/}
    destination=$target/$name
    [[ -x $source ]] || { echo "Not executable: $source" >&2; exit 1; }
    if [[ -L $destination && $(readlink -- "$destination") == "$source" ]]; then
        continue
    fi
    [[ ! -d $destination ]] || { echo "Refusing to replace directory: $destination" >&2; exit 1; }
    if [[ -e $destination || -L $destination ]]; then
        if [[ -z $backup ]]; then
            backup=$(mktemp -d "$target/bcachefs-backup.XXXXXXXX")
            echo "Backup: $backup"
        fi
        cp -a -- "$destination" "$backup/$name"
    fi
    ln -s -- "$source" "$staging/$name"
    mv -Tf -- "$staging/$name" "$destination"
    echo "$destination -> $source"
done