Use conffiles

Cargo.toml

@@ -40,12 +40,16 @@ suggests = "mysql-server-8.0, nginx"
 maintainer-scripts = "debian"
 assets = [
     ["target/release/reminder-rs", "usr/bin/reminder-rs", "755"],
-    ["conf/default.env", "etc/reminder-rs/default.env", "600"],
+    ["conf/default.env", "etc/reminder-rs/config.env", "600"],
     ["conf/Rocket.toml", "etc/reminder-rs/Rocket.toml", "600"],
-    ["web/static/**/*", "lib/reminder-rs/static", "666"],
+    ["web/static/**/*", "lib/reminder-rs/static", "644"],
-    ["web/templates/**/*", "lib/reminder-rs/templates", "666"],
+    ["web/templates/**/*", "lib/reminder-rs/templates", "644"],
 #    ["nginx/reminder-rs", "etc/nginx/sites-available/reminder-rs", "755"]
 ]
+conf-files = [
+    "/etc/reminder-rs/config.env",
+    "/etc/reminder-rs/Rocket.toml",
+]
 
 [package.metadata.deb.systemd-units]
 unit-scripts = "systemd"

debian/postinst

@@ -4,12 +4,6 @@ set -e
 
 id -u reminder &>/dev/null || useradd -r -M reminder
 
-if [ ! -f '/etc/reminder-rs/config.env' ]; then
+chown -R reminder /etc/reminder-rs
-  echo "Copying configuration file..."
-  cp /etc/reminder-rs/default.env /etc/reminder-rs/config.env
-fi
-
-chown reminder /etc/reminder-rs/config.env
-chown reminder /etc/reminder-rs/Rocket.toml
 
 #DEBHELPER#

debian/postrm

@@ -4,8 +4,4 @@ set -e
 
 id -u reminder &>/dev/null || userdel reminder
 
-if [ -f '/etc/reminder-rs/config.env' ]; then
-  rm /etc/reminder-rs/config.env
-fi
-
 #DEBHELPER#