newsflash 0 -> 1
attrpath: newsflash
Checking auto update branch...
[version] 
[version] skipping because derivation has updateScript
[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] this derivation will be built:
  /nix/store/6r4ki0gqnbmjhskk5frym1780csckzgy-packages.json.drv
building '/nix/store/6r4ki0gqnbmjhskk5frym1780csckzgy-packages.json.drv'...

Going to be running update for following packages:
 - newsflash-3.0.2

Press Enter key to continue...
Running update for:
 - newsflash-3.0.2: UPDATING ...
 - newsflash-3.0.2: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/applications/networking/feedreaders/newsflash/default.nix b/pkgs/applications/networking/feedreaders/newsflash/default.nix
index 5631a8419cc2..ad25d6839782 100644
--- a/pkgs/applications/networking/feedreaders/newsflash/default.nix
+++ b/pkgs/applications/networking/feedreaders/newsflash/default.nix
@@ -25,13 +25,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "newsflash";
-  version = "3.0.2";
+  version = "3.1.1";
 
   src = fetchFromGitLab {
     owner = "news-flash";
     repo = "news_flash_gtk";
     rev = "refs/tags/v.${finalAttrs.version}";
-    sha256 = "sha256-tJKr2bGkdpEb+25eN0ZfHhEDl5Zdf8fdaC/rNMbH8Ws=";
+    sha256 = "sha256-ivdrbGtNa4/o+tXBQF9Ef17iNEUVFNPEXw1XpYxmRoQ=";
   };
 
   cargoDeps = rustPlatform.importCargoLock {

No auto update branch exists
Received ExitFailure 1 when running
Raw command: /nix/store/3nqhcyc7vid1npgcd0m7arg5sn325nhz-nix-2.12.0/bin/nix-build --option sandbox true --arg config "{ allowBroken = true; allowUnfree = true; allowAliases = false; }" --arg overlays "[ ]" -A newsflash
nix build failed.
<  "rand",
---
>  "rand 0.8.5",
5047c5002
< version = "3.15.0"
---
> version = "3.14.1"
5049c5004
< checksum = "b4a1ba45ed0ad344b85a2bb5a1fe9830aed23d67812ea39a586e7d0136439c7d"
---
> checksum = "41d1794a946878c0e807f55a397187c11fc7a038ba5d868e7db4f3bd7760bc9d"
5051c5006
<  "proc-macro-crate 1.3.1",
---
>  "proc-macro-crate",
5100c5055
<  "proc-macro-crate 1.3.1",
---
>  "proc-macro-crate",

ERROR: cargoHash or cargoSha256 is out of date

Cargo.lock is not the same in /build/cargo-vendor-dir

To fix the issue:
1. Set cargoHash/cargoSha256 to an empty string: `cargoHash = "";`
2. Build the derivation and wait for it to fail with a hash mismatch
3. Copy the "got: sha256-..." value back into the cargoHash field
   You should have: cargoHash = "sha256-XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX=";