simple package mirroring workflow

Author: peterbecich

README.md

@@ -36,7 +36,18 @@ Alternatively, open the [`nix develop`](https://nixos.org/manual/nix/stable/comm
     $ cabal v2-run -- hackage-server run --static-dir=datafiles --state-dir=state --base-uri=http://127.0.0.1:8080
     hackage-server: Ready! Point your browser at http://127.0.0.1:8080
 
-##### Not working
+#### Populate the local package index
+
+This copies packages from real Hackage Server to local Hackage Server.
+
+Add the default `admin` user to the `mirrorers` group here:
+http://localhost:8080/packages/mirrorers/
+
+Then
+
+     $ nix run .#mirror-hackage-server
+
+#### Not working
 
 Please note this App *cannot* be run [directly from GitHub](https://determinate.systems/posts/nix-run) like this:
 

flake.nix

@@ -36,6 +36,22 @@
               };
             in "${lib.getExe run-hackage-server}";
         };
+        apps.mirror-hackage-server = {
+          type = "app";
+          program =
+            let
+              mirror-hackage-server = pkgs.writeShellApplication {
+                name = "mirror-hackage-server";
+                runtimeInputs = [ config.packages.default ];
+                text = ''
+                  echo 'Copying packages from real Hackage Server into local Hackage Server.'
+                  echo 'This assumes the local Hackage Server uses default credentials;'
+                  echo 'otherwise, override in nix-default-servers.cfg'
+                  hackage-mirror nix-default-servers.cfg
+                '';
+              };
+            in "${lib.getExe mirror-hackage-server}";
+        };
         packages.default = config.packages.hackage-server;
         haskellProjects.default = {
           settings = {

nix-default-servers.cfg

@@ -0,0 +1,9 @@
+source "hackage"
+  uri: http://hackage.haskell.org
+  type: secure
+
+target "mirror"
+  uri: http://admin:admin@localhost:8080
+  type: hackage2
+
+  post-mirror-hook: "shell command to execute"