buck2 0 -> 1
attrpath: buck2
Checking auto update branch...
[version] 
[version] generic version rewriter does not support multiple hashes
[rustCrateVersion] 
[rustCrateVersion] No cargoSha256 or cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorSha256 or vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] 
Going to be running update for following packages:
 - buck2-unstable-2024-03-15

Press Enter key to continue...
Running update for:
 - buck2-unstable-2024-03-15: UPDATING ...
 - buck2-unstable-2024-03-15: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/development/tools/build-managers/buck2/default.nix b/pkgs/development/tools/build-managers/buck2/default.nix
index 3aad79ce1e58..7cf6a5173f4a 100644
--- a/pkgs/development/tools/build-managers/buck2/default.nix
+++ b/pkgs/development/tools/build-managers/buck2/default.nix
@@ -38,7 +38,7 @@ let
   buildHashes = builtins.fromJSON (builtins.readFile ./hashes.json);
 
   # our version of buck2; this should be a git tag
-  version = "2024-03-15";
+  version = "2024-04-15";
 
   # the platform-specific, statically linked binary — which is also
   # zstd-compressed
@@ -63,7 +63,7 @@ let
   # tooling
   prelude-src =
     let
-      prelude-hash = "c68a0e4b35928891e72df1738c890bfcb76a6174";
+      prelude-hash = "36321f97fc20b57efb5864606d61f4568e42a7fd";
       name = "buck2-prelude-${version}.tar.gz";
       hash = buildHashes."_prelude";
       url = "https://github.com/facebook/buck2-prelude/archive/${prelude-hash}.tar.gz";
diff --git a/pkgs/development/tools/build-managers/buck2/hashes.json b/pkgs/development/tools/build-managers/buck2/hashes.json
index 280228e6f4e8..e0ec6a159863 100644
--- a/pkgs/development/tools/build-managers/buck2/hashes.json
+++ b/pkgs/development/tools/build-managers/buck2/hashes.json
@@ -1,7 +1,7 @@
 { "_comment": "@generated by pkgs/development/tools/build-managers/buck2/update.sh"
-, "_prelude": "sha256-PTetJetdpFU3bKLU1WESMwIEZox86IcrczvCxmaQzoE="
-, "x86_64-linux": "sha256-2vaKYCFRu2fNA/Nsu3HHT5DWtNeMnEfE8FVl7bat1HQ="
-, "x86_64-darwin": "sha256-zzB3sPOCDGWAb4CQO0yjb7Bph+ioi3cJoMYO/2YzXfU="
-, "aarch64-linux": "sha256-sx8rcADlfdAECL/SSHeB7vzxoedqx6+yT7yJp1qLBgM="
-, "aarch64-darwin": "sha256-GKQ8Xfe9iRpgq5SrM6nyyIPBh9gC25uN/vzGRjViQdQ="
+, "_prelude": "sha256-7rPhF/kjVHBYikYqG3wUUKkNE1SB6J3BxwXcofrCyp0="
+, "x86_64-linux": "sha256-VoUaeCOrRhIJ0kuYYeyOFOtdoIjUU5UdSV61yiVx+KA="
+, "x86_64-darwin": "sha256-8f5TDTiPu8QV66IG0/+ghYjyRmZqJAce+lTSTFOLKpI="
+, "aarch64-linux": "sha256-aky/H5iNZqeFe1/zLxh0mOgLnH/JRcvjN8KBqDcg/0g="
+, "aarch64-darwin": "sha256-QIDCYWZwanN8B1YwuRolNY+YXeyLqoxorT2diZk3U/0="
 }

No auto update branch exists
There might already be an open PR for this update:
- buck2: unstable-2024-03-15 -> unstable-2024-04-01
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/303473"