From b9222ae0a31ed7087166b2a611caa0ed7a49df7d Mon Sep 17 00:00:00 2001
From: emily <ek@kyouma.net>
Date: Fri, 8 Nov 2024 14:49:21 +0100
Subject: [PATCH] restic,florp: add backup

---
 .sops.yaml                                    |  6 ++
 config/hosts/florp/configuration.nix          | 11 +++-
 modules/restic/default.nix                    | 65 +++++++++++++++++++
 .../zh3485.rsync.net/ssh_host_ed25519_key.pub |  1 +
 secrets/restic/zh3485s1.yaml                  | 35 ++++++++++
 5 files changed, 117 insertions(+), 1 deletion(-)
 create mode 100644 modules/restic/default.nix
 create mode 100644 modules/restic/zh3485.rsync.net/ssh_host_ed25519_key.pub
 create mode 100644 secrets/restic/zh3485s1.yaml

diff --git a/.sops.yaml b/.sops.yaml
index fc9da64..bc78ba5 100644
--- a/.sops.yaml
+++ b/.sops.yaml
@@ -59,3 +59,9 @@ creation_rules:
       - *emily
       age:
       - *florp
+  - path_regex: secrets/restic/zh3485s1.yaml
+    key_groups:
+    - pgp:
+      - *emily
+      age:
+      - *florp
diff --git a/config/hosts/florp/configuration.nix b/config/hosts/florp/configuration.nix
index 4a7e62f..365cfd5 100644
--- a/config/hosts/florp/configuration.nix
+++ b/config/hosts/florp/configuration.nix
@@ -12,6 +12,15 @@
     domain = lib.mkForce "social";
   };
   kyouma.nginx.defaultForbidden = "florp.social";
+
+  kyouma.restic = {
+    enable = true;
+    remoteUser = "zh3485s1";
+    paths = [
+      "/var/lib/akkoma"
+      "/var/lib/postgresql"
+    ];
+  };
   systemd.network.networks."98-eth-default" = {
     address = [
       "2a0f:be01:0:100::171/128" 
@@ -19,7 +28,7 @@
   };
 
   services.postgresql.settings = {
-    max_connections = 30;
+    max_connections = 128;
     shared_buffers = "4GB";
     effective_cache_size = "12GB";
     maintenance_work_mem = "1GB";
diff --git a/modules/restic/default.nix b/modules/restic/default.nix
new file mode 100644
index 0000000..0160ef2
--- /dev/null
+++ b/modules/restic/default.nix
@@ -0,0 +1,65 @@
+{ config, lib, pkgs, ... }: let
+  cfg = config.kyouma.restic;
+in {
+  options.kyouma.restic = let
+    inherit (lib) mkOption types;
+  in {
+    enable = lib.mkEnableOption "Enable restic backup";
+    paths = mkOption {
+      description = "paths to backup";
+      type = with types; listOf path;
+      default = [];
+    };
+    pruneOpts = mkOption {
+      description = "paths to backup";
+      type = with types; listOf str;
+      default = [
+        "--keep-hourly 24"
+        "--keep-daily 14"
+        "--keep-weekly 8"
+        "--keep-monthly 12"
+      ];
+    };
+    remote = mkOption {
+      description = "restic remote to use";
+      type = types.nonEmptyStr;
+      default = "zh3485.rsync.net";
+    };
+    remoteUser = mkOption {
+      description = "remote ssh user";
+      type = types.nonEmptyStr;
+      default = "";
+    };
+    user = mkOption {
+      description = "user who runs the backup job";
+      type = types.nonEmptyStr;
+      default = "root";
+    };
+    repo = mkOption {
+      description = "restic repo";
+      type = types.nonEmptyStr;
+      default = "${config.networking.hostName}-backup";
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    sops.secrets."restic/${cfg.remoteUser}/password" = {
+      sopsFile = ../../secrets/restic/${cfg.remoteUser}.yaml;
+    };
+    sops.secrets."restic/${cfg.remoteUser}/id_ed25519" = {
+      sopsFile = ../../secrets/restic/${cfg.remoteUser}.yaml;
+    };
+
+    services.restic.backups."${config.networking.hostName}-${cfg.remote}" = {
+      inherit (cfg) paths user pruneOpts;
+      initialize = true;
+      repository = "sftp:${cfg.remoteUser}@${cfg.remote}:${cfg.repo}";
+      passwordFile = config.sops.secrets."restic/${cfg.remoteUser}".path;
+      extraOptions = let
+        knownHost = pkgs.writeText "${cfg.remote}-known-host" (builtins.readFile ./${cfg.remote}/ssh_host_ed25519_key.pub);
+        sshKey = config.sops.secrets."restic/${cfg.remoteUser}/id_ed25519".path;
+      in [
+        "sftp.command='ssh ${cfg.remoteUser}@${cfg.remote} -i ${sshKey} -o UserKnownHostsFile=${knownHost} -s sftp'"
+      ];
+    };
+  }; 
+}
diff --git a/modules/restic/zh3485.rsync.net/ssh_host_ed25519_key.pub b/modules/restic/zh3485.rsync.net/ssh_host_ed25519_key.pub
new file mode 100644
index 0000000..a4fe26e
--- /dev/null
+++ b/modules/restic/zh3485.rsync.net/ssh_host_ed25519_key.pub
@@ -0,0 +1 @@
+zh3485.rsync.net ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIJtclizeBy1Uo3D86HpgD3LONGVH0CJ0NT+YfZlldAJd
diff --git a/secrets/restic/zh3485s1.yaml b/secrets/restic/zh3485s1.yaml
new file mode 100644
index 0000000..7ec39ce
--- /dev/null
+++ b/secrets/restic/zh3485s1.yaml
@@ -0,0 +1,35 @@
+restic:
+    zh3485s1:
+        password: ENC[AES256_GCM,data:lDDSSqUH3pewpMA+6SNwGwRz95MBjeaD6I3RWUQNBFXsw/W9RoIY85AcRXxCl7CW,iv:NFF6uCs2FolMe9cgPkoAFmbWdXG2SuVRtoOyQXouEAU=,tag:UeC49xFwFkMh0Wi8p9reFw==,type:str]
+        id_ed25519: ENC[AES256_GCM,data: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,iv:1+aopW183ir5XHMKcDons24A/E61mLuyJGrQTRpPXdE=,tag:s1w+HZdktM0H9FUrz097Cw==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age18vc8rcmczlt3r0ee7jr9s8l3yrkthu8wtypt08eh0eskpkw3dg6qxs7t3t
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBQeWpKYktzVE1tMkpGU1c5
+            akZZdlBkeFQyUmUrOHZxTGE2V1FUVmV3cG5VCmZvTG1JTS9SUTk1aVl6TnBPQ1Fh
+            clRDTmQzQUJxWlYyV2dmVXNyTDJ2K0kKLS0tIHA3S0dsQzRxRWF4RFdSSzh1aXI5
+            ZFQvWFhZTndubkxaRVh3YXl0V25ZcUEK0/wV9i01kRkphrseSBqAL9f8tUlUtJDO
+            PUZL2Em/QjNEnXJaxxR612ONA94ptK9bsqzRJV5RtGqDwd+oAnr13Q==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2024-11-08T13:41:02Z"
+    mac: ENC[AES256_GCM,data:tMatUcv/jbvQ1URp6DrUyuiB9+rgCCdOxEVcM0NBiV5P9DGWE1hWytky4yPE9nFUOWLI7m4nTSEXHuT4yT3LkBd1Ndzhm5wQ0NEAVnZ6Sj7YOQI5CS1q95sviJBv57PBkaajHDNeSJX2hEQeR4qJFUR4fu0hIwadyzeunP/kfKE=,iv:gXRAg4cN43ocQMZm0lL8AnrbDtK+TKGchWpd/TYhnjA=,tag:+HqYuDWjoTdv+CWrJmuwxA==,type:str]
+    pgp:
+        - created_at: "2024-11-08T13:31:55Z"
+          enc: |-
+            -----BEGIN PGP MESSAGE-----
+
+            hF4D1GtNSlou/HkSAQdALVqRZ2qzjR86mEE/MHAR5H3gmIukchY/NSvGg1Ggfmsw
+            uZhnl5puGOO579ItHXbk+BYwBS2koL7jyhnX8E9zmM3d3SZHwzx0mk79fr2jLFj6
+            0l4BLrhhcpUtzfje4/SeTgWFRIA68ON/PUTmW2Lgclh9OpQfbbousFS/JMvvdHaT
+            /3uJEww5MKMPlqWqK7w7z6iwIITRKH0vzQoIZ3hVcDKtKOJrJ/1bWcJorFsazxvT
+            =KZPf
+            -----END PGP MESSAGE-----
+          fp: B04F01A7A98A13020C39B4A68AB7B773A214ACE5
+    unencrypted_suffix: _unencrypted
+    version: 3.9.1