Add notes on monorepo dev

doc/monorepo-tips.md

@@ -0,0 +1,26 @@
+# Managing monorepos: nixpkgs developments made easy
+
+## sync from upstream
+
+This ensures minimal blob transfers in a sparse checkout:
+```bash
+# pin the latest hash from the nixpkgs-unstable channel
+nix registry pin nixpkgs
+
+# find the "$rev" hash by inspecting the cached registry
+nix registry list
+
+# fetch the git "$rev" from the remote
+git fetch origin "$rev"
+
+# bump local master to the "$rev"
+git switch master
+git reset --hard "$rev"
+
+# sync github remote with upstream from the web interface,
+# and then fetch the upstream "$rev"
+git fetch origin master
+
+# reset the remote master to the channel "$rev"
+git push --force
+```

home.nix

@@ -60,6 +60,7 @@ let
       trash-cli
       git-branchless
       dust
+      bottom
       openssh  # need to unset SSH_AUTH_SOCK, maybe
       # trashy  # better, but its zsh completion is broken
 

profile.json

@@ -15,7 +15,7 @@
       "active": true,
       "priority": 5,
       "storePaths": [
-        "/nix/store/lndb6k43xc67r373v22hck5j58w4ln1j-home-manager-path"
+        "/nix/store/nwbyv3qmvabr8w65v6j7y1cbk752693y-home-manager-path"
       ]
     }
   },