importCargoLock: git deps with rev, branch or tag

Previously importCargoLog only recognized git dependencies with `rev =`.
This adds support for git dependencies with `branch =` or `tag =`.

pkgs/build-support/rust/import-cargo-lock.nix

@@ -12,14 +12,15 @@ let
   # Parse a git source into different components.
   parseGit = src:
     let
-      parts = builtins.match ''git\+([^?]+)(\?rev=(.*))?#(.*)?'' src;
-      rev = builtins.elemAt parts 2;
+      parts = builtins.match ''git\+([^?]+)(\?(rev|tag|branch)=(.*))?#(.*)'' src;
+      type = builtins.elemAt parts 2; # rev, tag or branch
+      value = builtins.elemAt parts 3;
     in
       if parts == null then null
       else {
         url = builtins.elemAt parts 0;
-        sha = builtins.elemAt parts 3;
-      } // lib.optionalAttrs (rev != null) { inherit rev; };
+        sha = builtins.elemAt parts 4;
+      } // lib.optionalAttrs (type != null) { inherit type value; };
 
   packages = (builtins.fromTOML (builtins.readFile lockFile)).package;
 
@@ -137,7 +138,7 @@ let
         cat > $out/.cargo-config <<EOF
         [source."${gitParts.url}"]
         git = "${gitParts.url}"
-        ${lib.optionalString (gitParts ? rev) "rev = \"${gitParts.rev}\""}
+        ${lib.optionalString (gitParts ? type) "${gitParts.type} = \"${gitParts.value}\""}
         replace-with = "vendored-sources"
         EOF
       ''