From dc4072da459bc206b3c2232a1f3adde5f63e89f5 Mon Sep 17 00:00:00 2001
From: arcnmx <git@git.arcn.mx>
Date: Tue, 5 Mar 2024 14:03:59 -0800
Subject: [PATCH] fix(plex): cache mount

---
 nixos/plex.nix          | 20 +++++++++++++++++---
 systems/reisen/setup.sh |  8 ++++----
 2 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/nixos/plex.nix b/nixos/plex.nix
index 07c7cb35..553620fd 100644
--- a/nixos/plex.nix
+++ b/nixos/plex.nix
@@ -1,5 +1,6 @@
-{config, lib, ...}: let
-  inherit (lib.modules) mkIf mkDefault;
+{config, lib, pkgs, ...}: let
+  inherit (lib.modules) mkIf mkForce mkDefault;
+  inherit (lib.strings) escapeShellArg;
   cfg = config.services.plex;
 in {
   services.plex.enable = mkDefault true;
@@ -8,7 +9,20 @@ in {
     environment.MESA_SHADER_CACHE_DIR = mkDefault cfg.dataDir;
     serviceConfig = {
       BindPaths = [
-        "/mnt/caches/plex/Cache:${cfg.dataDir}/Plex Media Server/Cache"
+        ''/mnt/caches/plex/Cache:${cfg.dataDir}/Cache''
+      ];
+      ExecStartPre = let
+        # systemd doesn't seem to like spaces so use a symlink instead...
+        preStartScript = pkgs.writeShellScript "plex-run-prestart" ''
+          set -eu
+
+          if [[ ! -d $PLEX_DATADIR ]]; then
+            ${pkgs.coreutils}/bin/install -d -m 0755 -o ${escapeShellArg cfg.user} -g ${escapeShellArg cfg.group} "$PLEX_DATADIR/Plex Media Server"
+          fi
+          ${pkgs.coreutils}/bin/ln -sfT ../Cache "$PLEX_DATADIR/Plex Media Server/Cache"
+        '';
+      in mkForce [
+        ''!${preStartScript}''
       ];
       # KillMode = "mixed" doesn't behave as expected...
       TimeoutStopSec = 5;
diff --git a/systems/reisen/setup.sh b/systems/reisen/setup.sh
index 64f41c19..7185ad51 100644
--- a/systems/reisen/setup.sh
+++ b/systems/reisen/setup.sh
@@ -95,24 +95,24 @@ EOF
 if [[ ! -d /rpool/shared ]]; then
 	zfs create rpool/shared
 fi
+
 if [[ ! -d /rpool/shared/nix ]]; then
 	zfs create rpool/shared/nix
 fi
-
 if [[ ! -d /rpool/shared/nix/store ]]; then
 	zfs create -o compression=zstd rpool/shared/nix/store
 fi
-chown 100000:30000 /rpool/shared/nix/store
-chmod 1775 /rpool/shared/nix/store
-
 if [[ ! -d /rpool/shared/nix/var ]]; then
 	mkdir /rpool/shared/nix/var
 fi
+chown 100000:30000 /rpool/shared/nix/store
+chmod 1775 /rpool/shared/nix/store
 chown 100000:100000 /rpool/shared/nix/var
 
 if [[ ! -d /rpool/caches ]]; then
 	zfs create rpool/caches
 fi
+
 if [[ ! -d /rpool/caches/plex ]]; then
 	zfs create rpool/caches/plex
 fi