allow to manually override filename that is patched

README.md

@@ -91,6 +91,13 @@ a regex can be used
 $ nix-update jq --version-regex 'jq-(.*)'
 ```
 
+By default `nix-update` will locate the file that needs to be patched using the `src` attribute of a derivation.
+In some cases this heurestic is wrong. One can override the behavior like that:
+
+``` console
+$ nix-update hello --override-filename pkgs/applications/misc/hello/default.nix
+```
+
 With the `--shell`, `--build`, `--test` and `--run` flags the update can be
 tested. Additionally, the `--review` flag can be used to
 initiate a run of [nixpkgs-review](https://github.com/Mic92/nixpkgs-review), which will ensure all

nix_update/__init__.py

@@ -53,6 +53,12 @@ def parse_args() -> Options:
     parser.add_argument(
         "--version", nargs="?", help="Version to update to", default="stable"
     )
+    parser.add_argument(
+        "--override-filename",
+        nargs="?",
+        help="Set filename where nix-update will update version/hash",
+        default=None,
+    )
     parser.add_argument("attribute", help="Attribute name within the file evaluated")
     args = parser.parse_args()
     return Options(
@@ -69,6 +75,7 @@ def parse_args() -> Options:
         version_regex=args.version_regex,
         review=args.review,
         format=args.format,
+        override_filename=args.override_filename,
     )
 
 

nix_update/eval.py

@@ -89,6 +89,8 @@ def eval_attr(opts: Options) -> Package:
     res = run(cmd)
     out = json.loads(res.stdout)
     package = Package(attribute=opts.attribute, **out)
+    if opts.override_filename is not None:
+        package.filename = opts.override_filename
     if opts.version_preference != VersionPreference.SKIP and package.old_version == "":
         raise UpdateError(
             f"Nix's builtins.parseDrvName could not parse the version from {package.name}"

nix_update/options.py

@@ -10,6 +10,7 @@ class Options:
     version_preference: VersionPreference = VersionPreference.STABLE
     version_regex: str = "(.*)"
     import_path: str = "./."
+    override_filename: Optional[str] = None
     commit: bool = False
     write_commit_message: Optional[str] = None
     shell: bool = False

nix_update/update.py

@@ -122,7 +122,6 @@ def update_version(
                 raise UpdateError(
                     "Could not find a url in the derivations src attribute"
                 )
-        version
         new_version = fetch_latest_version(package.url, preference, version_regex)
     package.new_version = new_version
     position = package.version_position