From fa192a3977f01b2656f3b092319a4196531df8bb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kier=C3=A1n=20Meinhardt?= <kmein@posteo.de>
Date: Sun, 30 May 2021 12:57:37 +0200
Subject: [PATCH] feat(hedgedoc): add backup script

---
 configs/hedgedoc.nix              | 51 ++++++++++++++++++++++++++++++-
 systems/makanek/configuration.nix |  8 ++++-
 2 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/configs/hedgedoc.nix b/configs/hedgedoc.nix
index 9ecbb84..03fc903 100644
--- a/configs/hedgedoc.nix
+++ b/configs/hedgedoc.nix
@@ -1,4 +1,11 @@
+{ pkgs, ... }:
+let
+  backupLocation = "/var/lib/codimd-backup";
+  stateLocation = "/var/lib/codimd/state.sqlite";
+in
 {
+  imports = [ <stockholm/krebs/3modules/permown.nix> ];
+
   services.nginx.virtualHosts."pad.xn--kiern-0qa.de" = {
     enableACME = true;
     addSSL = true;
@@ -17,9 +24,51 @@
       allowFreeURL = true;
       db = {
         dialect = "sqlite";
-        storage = "/var/lib/codimd/state.sqlite";
+        storage = stateLocation;
       };
       port = 3091;
     };
   };
+
+  krebs.permown.${backupLocation} = { owner = "codimd"; group = "codimd"; umask = "0002"; };
+
+  systemd.services.hedgedoc-backup = {
+    description = "Hedgedoc backup service";
+    script = ''
+      ${pkgs.sqlite}/bin/sqlite3 -csv ${stateLocation} "select id, alias, ownerId, content from Notes" \
+      | ${pkgs.writers.writePython3 "hedgedoc-csv-to-fs.py" {} ''
+        import csv
+        import pathlib
+        import sys
+
+        reader = csv.reader(
+            (line.decode("utf-8") for line in sys.stdin.buffer.readlines()),
+            dialect="unix"
+        )
+        for row in reader:
+            try:
+                id, alias, ownerId, content = row
+
+                user_directory = pathlib.Path(ownerId)
+                user_directory.mkdir(exist_ok=True)
+
+                file_path = user_directory / ((alias if alias else id) + ".md")
+                file_path.write_text(content)
+
+                sys.stderr.write(f"✔ {file_path}\n")
+            except ValueError:
+                sys.stderr.write(
+                    f"row {reader.line_num} does not have the correct number of fields"
+                )
+                continue
+      ''}
+    '';
+    startAt = "hourly";
+    serviceConfig = {
+      Type = "oneshot";
+      User = "codimd";
+      Group = "codimd";
+      WorkingDirectory = backupLocation;
+    };
+  };
 }
diff --git a/systems/makanek/configuration.nix b/systems/makanek/configuration.nix
index c691ca3..2a5b143 100644
--- a/systems/makanek/configuration.nix
+++ b/systems/makanek/configuration.nix
@@ -65,7 +65,13 @@ in
   boot.loader.grub.enable = true;
   boot.loader.grub.version = 2;
 
-  nixpkgs.config.allowUnfree = true;
+  nixpkgs.config = {
+    allowUnfree = true;
+    packageOverrides = pkgs: {
+      writeDashBin = pkgs.writers.writeDashBin;
+      writeDash = pkgs.writers.writeDash;
+    };
+  };
 
   networking.useDHCP = false;
   networking.interfaces.ens3.useDHCP = true;