Add p service for pastes

Reviewed-by: Aleix Boné <abonerib@bsc.es>
Reviewed-by: Aleix Roca Nonell <aleix.rocanonell@bsc.es>

m/module/p.nix

@@ -0,0 +1,68 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.services.p;
+in
+{
+  options = {
+    services.p = {
+      enable = lib.mkOption {
+        type = lib.types.bool;
+        default = false;
+        description = "Whether to enable the p service.";
+      };
+      path = lib.mkOption {
+        type = lib.types.str;
+        default = "/var/lib/p";
+        description = "Where to save the pasted files on disk.";
+      };
+      url = lib.mkOption {
+        type = lib.types.str;
+        default = "https://jungle.bsc.es/p";
+        description = "URL prefix for the printed file.";
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = let 
+      p = pkgs.writeShellScriptBin "p" ''
+        set -e
+        pastedir="${cfg.path}/$USER"
+        cd "$pastedir"
+
+        ext="txt"
+        if [ -n "$1" ]; then
+          ext="$1"
+        fi
+
+        out=$(mktemp "XXXXXXXX.$ext")
+        cat > "$out"
+        chmod go+r "$out"
+        echo "${cfg.url}/$USER/$out"
+      '';
+    in [ p ];
+
+    systemd.services.p = let
+      # Take only normal users
+      users = lib.filterAttrs (_: v: v.isNormalUser) config.users.users;
+      # Create a directory for each user
+      commands = lib.concatLists (lib.mapAttrsToList (_: user: [
+        "install -d -o ${user.name} -g ${user.group} -m 0755 ${cfg.path}/${user.name}"
+      ]) users);
+    in {
+      description = "P service setup";
+      requires = [ "network-online.target" ];
+      #wants = [ "remote-fs.target" ];
+      #after = [ "remote-fs.target" ];
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        ExecStart = pkgs.writeShellScript "p-init.sh" (''
+
+          install -d -o root -g root -m 0755 ${cfg.path}
+
+        '' + (lib.concatLines commands));
+      };
+    };
+  };
+}

m/tent/configuration.nix

@@ -12,6 +12,7 @@
     ./gitlab-runner.nix
     ./gitea.nix
     ../hut/public-inbox.nix
+    ../module/p.nix
   ];
 
   # Select the this using the ID to avoid mismatches
@@ -32,6 +33,8 @@
     defaultGateway = "10.0.44.1";
   };
 
+  services.p.enable = true;
+
   services.prometheus.exporters.node = {
     enable = true;
     enabledCollectors = [ "systemd" ];

m/tent/nginx.nix

@@ -64,6 +64,9 @@ in
           autoindex on;
           absolute_redirect off;
         }
+        location /p/ {
+          alias /var/lib/p/;
+        }
       '';
     };
   };