From f2e4142dff1c20857437d821db5006348df0ba56 Mon Sep 17 00:00:00 2001
From: lassulus <git@lassul.us>
Date: Mon, 5 Jun 2023 19:52:52 +0200
Subject: cal: use radicale with git sync

---
 krebs/2configs/cal.nix | 127 ++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 105 insertions(+), 22 deletions(-)

diff --git a/krebs/2configs/cal.nix b/krebs/2configs/cal.nix
index 90093e8eb..15f0027b3 100644
--- a/krebs/2configs/cal.nix
+++ b/krebs/2configs/cal.nix
@@ -1,33 +1,116 @@
-{ config, lib, pkgs, ... }:
-{
-  users.users.testing = {
-    uid = pkgs.stockholm.lib.genid_uint31 "testing";
-    isNormalUser = true;
-    openssh.authorizedKeys.keys = [
-      config.krebs.users.xkey.pubkey
-      config.krebs.users.lass.pubkey
-    ];
-    packages = [
-      pkgs.calendar-cli
-      pkgs.tmux
-    ];
-  };
+{ config, lib, pkgs, ... }: let
+
+  setupGit = ''
+    export PATH=${lib.makeBinPath [
+      pkgs.coreutils
+      pkgs.git
+    ]}
+    export GIT_SSH_COMMAND='${pkgs.openssh}/bin/ssh -i /var/lib/radicale/.ssh/id_ed25519'
+    repo='git@localhost:cal'
+    cd /var/lib/radicale/collections
+    if ! test -d .git; then
+      git init
+      git config user.name "radicale"
+      git config user.email "radicale@${config.networking.hostName}"
+    elif ! url=$(git config remote.origin.url); then
+      git remote add origin "$repo"
+    elif test "$url" != "$repo"; then
+      git remote set-url origin "$repo"
+    fi
+    cp ${pkgs.writeText "gitignore" ''
+      .Radicale.cache
+    ''} .gitignore
+    git add .gitignore
+  '';
 
-  services.xandikos = {
+  pushCal = pkgs.writeDash "push_cal" ''
+    ${setupGit}
+    git fetch origin
+    git merge --ff-only origin/master || :
+  '';
+
+  pushCgit = pkgs.writeDash "push_cgit" ''
+    ${setupGit}
+    git push origin master
+  '';
+
+in {
+  services.radicale = {
     enable = true;
-    extraOptions = [
-      "--autocreate"
-      "--defaults"
-      "--current-user-principal /krebs"
-      "--dump-dav-xml"
-    ];
+    rights = {
+      krebs = {
+        user = ".*";
+        collection = ".*";
+        permissions = "rRwW";
+      };
+    };
+    settings = {
+      auth.type = "none";
+      server.hosts = [
+        "0.0.0.0:5232"
+        "[::]:5232"
+      ];
+      storage.filesystem_folder = "/var/lib/radicale/collections";
+      storage.hook = "${pkgs.writers.writeDash "radicale-hook" ''
+        set -efu
+        ${setupGit}
+        ${pkgs.git}/bin/git add -A
+        (${pkgs.git}/bin/git diff --cached --quiet || ${pkgs.git}/bin/git commit -m "Changes by \"$1\"")
+        ${pushCgit}
+      ''} %(user)s";
+    };
   };
 
   services.nginx = {
     enable = true;
 
     virtualHosts = {
-      "calendar.r".locations."/".proxyPass = "http://localhost:${toString config.services.xandikos.port}/";
+      "calendar.r".locations."/".proxyPass = "http://localhost:5232/";
+    };
+  };
+  krebs.git = {
+    enable = true;
+    cgit.settings = {
+      root-title = "krebs repos";
+    };
+    rules = with pkgs.stockholm.lib.git; [
+      {
+        user = [
+          {
+            name = "cal";
+            pubkey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGe1jtHaNFZKmWemWQVEGVYj+s4QGJaL9WYH+wokOZie";
+          }
+        ] ++ (lib.attrValues config.krebs.users);
+        repo = [ config.krebs.git.repos.cal ];
+        perm = push ''refs/heads/master'' [ create merge ];
+      }
+    ];
+    repos.cal = {
+      public = true;
+      name = "cal";
+      hooks = {
+        post-receive = ''
+          ${pkgs.git-hooks.irc-announce {
+            channel = "#xxx";
+            refs = [
+              "refs/heads/master"
+            ];
+            nick = config.networking.hostName;
+            server = "irc.r";
+            verbose = true;
+          }}
+          /run/wrappers/bin/sudo -S -u radicale ${pushCal}
+        '';
+      };
     };
   };
+  krebs.secret.files.calendar = {
+    path = "/var/lib/radicale/.ssh/id_ed25519";
+    owner = { name = "radicale"; };
+    source-path = "${<secrets/radicale.id_ed25519>}";
+  };
+
+  security.sudo.extraConfig = ''
+    git ALL=(radicale) NOPASSWD: ${pushCal}
+  '';
 }
-- 
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