Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: buck2 0 -> 1
attrpath: buck2
Checking auto update branch...
[version] 
[version] generic version rewriter does not support multiple hashes
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] this derivation will be built:
  /nix/store/m2gvzd201h5vrfbr51d8w59yg7dsd5m1-packages.json.drv
building '/nix/store/m2gvzd201h5vrfbr51d8w59yg7dsd5m1-packages.json.drv'...

Going to be running update for following packages:
 - buck2-unstable-2026-04-15

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - buck2-unstable-2026-04-15: UPDATING ...
 - buck2-unstable-2026-04-15: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/by-name/bu/buck2/hashes.json b/pkgs/by-name/bu/buck2/hashes.json
index 1f897e49538a..f8fc7c13b1d8 100644
--- a/pkgs/by-name/bu/buck2/hashes.json
+++ b/pkgs/by-name/bu/buck2/hashes.json
@@ -1,7 +1,7 @@
 {
-  "aarch64-darwin": {
-    "buck2": "sha256-zBZ2gEPRxyaBYmnRfYfhYDqswqfiXvxYDHrUI92Z1UQ=",
-    "rust-project": "sha256-K86j0E32w0DUwzpPT0NBUiL3rV4Ze8hzfbKDkpy9JXo="
+  "aarch64-linux": {
+    "buck2": "sha256-VKV1vltATu3tAPmMiifba7MV9kNFH754FDda6i8cQrU=",
+    "rust-project": "sha256-oqxHdbNzQn1KHObboAd4/LTbilIJgLqMiWCgHLaPFrc="
   },
   "x86_64-linux": {
     "buck2": "sha256-IqDsyQ7Omy7QujT85oKrWwyirG7gwfupdxzvRoMRmQs=",
@@ -11,9 +11,9 @@
     "buck2": "sha256-G/xarAld9dXanZl7Ivcuoer3YsytmFXWED44u2U4q8g=",
     "rust-project": "sha256-jbvvqPI7+qpONhk8UZfSiFpMGCGWRr85BocA58d+C7Y="
   },
-  "aarch64-linux": {
-    "buck2": "sha256-VKV1vltATu3tAPmMiifba7MV9kNFH754FDda6i8cQrU=",
-    "rust-project": "sha256-oqxHdbNzQn1KHObboAd4/LTbilIJgLqMiWCgHLaPFrc="
+  "aarch64-darwin": {
+    "buck2": "sha256-zBZ2gEPRxyaBYmnRfYfhYDqswqfiXvxYDHrUI92Z1UQ=",
+    "rust-project": "sha256-K86j0E32w0DUwzpPT0NBUiL3rV4Ze8hzfbKDkpy9JXo="
   },
   "version": "2026-04-15",
   "preludeGit": "f0896771c4cc1ab8f87e032c5293376c89e5096b",

Package version did not change.