#!/bin/sh
# postinst — shared by the twiy and twiy-raweb packages.
#
# Config files live under /nginx but are NOT tracked by dpkg. The package
# ships an empty /nginx skeleton (so dpkg keeps the dirs across upgrades) plus
# a pristine copy of every config under /usr/share/twiy/defaults/nginx. We
# place configs from that stash here and NEVER overwrite a file that already
# exists — our copy is dropped beside it as <file>.new instead (e.g.
# nginx.conf.new). An upgrade therefore never changes an admin-edited config.
#
# /hostdata is left entirely to the admin: we only make sure the dir exists,
# and we never touch or remove its contents.

set -e

useradd -r -s /bin/false nginx 2>/dev/null || true

# Existing dirs are left exactly as they are (mkdir -p is a no-op then).
mkdir -p /nginx /hostdata

# Migration: older releases shipped /nginx/* as dpkg-tracked files, so the
# upgrade unpack deletes them before this script runs. preinst stashed a copy
# first — restore it now, without clobbering anything already present.
if [ -d /var/backups/twiy-nginx ]; then
    cp -an /var/backups/twiy-nginx/. /nginx/ 2>/dev/null || true
    rm -rf /var/backups/twiy-nginx
fi

# Seed packaged defaults:
#   - target absent          -> install it
#   - target present, differs -> keep theirs, drop ours as <file>.new
#   - target present, same    -> do nothing
seed_tree() {
    stash="$1"
    target="$2"
    [ -d "$stash" ] || return 0
    find "$stash" -type f | while IFS= read -r src; do
        rel=${src#$stash/}
        dst="$target/$rel"
        install -d "$(dirname "$dst")"
        if [ -e "$dst" ]; then
            cmp -s "$src" "$dst" || cp -p "$src" "$dst.new"
        else
            cp -p "$src" "$dst"
        fi
    done
}
seed_tree /usr/share/twiy/defaults/nginx /nginx

install -d /nginx/conf.d /nginx/config
install -d -o nginx -g nginx -m 0755 /var/log/nginx
chown -R nginx:nginx /var/log/nginx /nginx 2>/dev/null || true

systemctl daemon-reload  2>/dev/null || true
systemctl enable  nginx.service 2>/dev/null || true
systemctl restart nginx.service 2>/dev/null || true

exit 0