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/w0xr24m3vhxikzdwi4h5flvfrjd77gfh-packages.json.drv
building '/nix/store/w0xr24m3vhxikzdwi4h5flvfrjd77gfh-packages.json.drv'...

Going to be running update for following packages:
 - buck2-2026-07-15

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - buck2-2026-07-15: UPDATING ...
 - buck2-2026-07-15: 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 cbf18a92f293..c933735ac375 100644
--- a/pkgs/by-name/bu/buck2/hashes.json
+++ b/pkgs/by-name/bu/buck2/hashes.json
@@ -1,17 +1,17 @@
 {
+  "x86_64-linux": {
+    "buck2": "sha256-qjBNRxp59pIzsJdn1Lqa3XaQSbejf3ijpxpymDNy9RE=",
+    "rust-project": "sha256-Nr0agbScDlppNlUrJ+YVxTbXBmRlLdzC2f9AYUR2pEs="
+  },
   "aarch64-darwin": {
-    "buck2": "sha256-CIysxyxAD6Q4vkBSw2eC9Wsq+GKHqt8T7OXpdy1yRVw=",
-    "rust-project": "sha256-o5m58wQ9zKkpa5GzgLpcLUV9LpA+n+MxVa/9hH9Tr40="
+    "buck2": "sha256-zol0Uh3MnXg5KUO0+QvBpBYN0t8ylHFl64lRVtgwPxc=",
+    "rust-project": "sha256-3x0wqA5K/30ITQO3Xl3NZW5HnQG9yOBFQr0xI0UGbJo="
   },
   "aarch64-linux": {
-    "buck2": "sha256-4jm/cvQKeYfbkCTrbV4yVkL2SWxYnexr5UwQCNJhihk=",
-    "rust-project": "sha256-vGSOwVETwYqwBhkxlSTDJlVcMfbAIzYwDhEKbqz+6ok="
-  },
-  "x86_64-linux": {
-    "buck2": "sha256-7MPYB90LD+/xpCNoi9WYJjuDOdIj5oVXiocZZFbBnZU=",
-    "rust-project": "sha256-de0SbH6cbjdDhcPpDTjxBo5HgQ8yS1eokQYjQrHKIDY="
+    "buck2": "sha256-g/HrVfXV3zt7BstOfoZAB9ZArhbxqGq1HpvQKmubck8=",
+    "rust-project": "sha256-vOt/uCO3S5hbXhdq0S7uvKNiszSiTkWMh/hM5CkcOwI="
   },
-  "version": "2026-07-15",
-  "preludeGit": "caed0b8c0ee137c4e5e1f800a5054df151f490c2",
-  "preludeFod": "sha256-nMHnBf4vQJIxPgarmLPY38b15DFW2FlAQxDCzJgB+w8="
+  "version": "2026-08-01",
+  "preludeGit": "be471f9dd31a45b6c9c1610b1d996455b413b1f6",
+  "preludeFod": "sha256-EqbOUT67jJDx51euhGFWOrLTrZ416Y/ODILsKr5omxE="
 }

No auto update branch exists
Old version 2026-07-15" not present in master derivation file with contents: {
  "aarch64-darwin": {
    "buck2": "sha256-zol0Uh3MnXg5KUO0+QvBpBYN0t8ylHFl64lRVtgwPxc=",
    "rust-project": "sha256-3x0wqA5K/30ITQO3Xl3NZW5HnQG9yOBFQr0xI0UGbJo=",
    "starlark_fmt": "sha256-guJ2EGyaP6WLNSaW9fUPYNM5xU3Ge2AzAM3xAGvrdGI="
  },
  "aarch64-linux": {
    "buck2": "sha256-g/HrVfXV3zt7BstOfoZAB9ZArhbxqGq1HpvQKmubck8=",
    "rust-project": "sha256-vOt/uCO3S5hbXhdq0S7uvKNiszSiTkWMh/hM5CkcOwI=",
    "starlark_fmt": "sha256-GKsyygMfsGWdBLGv46pyRBeCq3CKqjL5Vi6F+sR1GAY="
  },
  "x86_64-linux": {
    "buck2": "sha256-qjBNRxp59pIzsJdn1Lqa3XaQSbejf3ijpxpymDNy9RE=",
    "rust-project": "sha256-Nr0agbScDlppNlUrJ+YVxTbXBmRlLdzC2f9AYUR2pEs=",
    "starlark_fmt": "sha256-W7LjUgUhCTlMtiFz9ExmtkWw0hSOUzZKwAF3np9+Qu4="
  },
  "version": "2026-08-01",
  "preludeGit": "be471f9dd31a45b6c9c1610b1d996455b413b1f6",
  "preludeFod": "sha256-EqbOUT67jJDx51euhGFWOrLTrZ416Y/ODILsKr5omxE="
}