tree-sitter/update: get executables from nix instead of environment

This was a small bug, the update script should of course not depend on
any executables in the environment.

Since we don’t use a nix string anymore, interpolation is out of the
question, so we pass it as arglib environment json string.

pkgs/development/tools/parsing/tree-sitter/update.nix

@@ -408,9 +408,15 @@ let
   urlEscape = x: x;
 
   # implementation of the fetching of repo information from github
-  fetchImpl = writers.writePython3 "fetchImpl" {
-    flakeIgnore = ["E501"];
-  } ./update_impl.py;
+  fetchImpl = writeShellScript "fetchImpl-wrapped" ''
+    env ARGLIB_JSON=${lib.escapeShellArg (lib.generators.toJSON {} {
+      curl = "${curl}/bin/curl";
+      nix-prefetch-git = "${nix-prefetch-git}/bin/nix-prefetch-git";
+    })} \
+      ${writers.writePython3 "fetchImpl" {
+          flakeIgnore = ["E501"];
+        } ./update_impl.py} "$@"
+  '';
 
   # find the latest repos of a github organization
   latestGithubRepos = { orga }: writeShellScript "latest-github-repos" ''

pkgs/development/tools/parsing/tree-sitter/update_impl.py

@@ -5,6 +5,7 @@ import os
 import sys
 
 debug = True if os.environ.get("DEBUG", False) else False
+bins = json.loads(os.environ['ARGLIB_JSON'])
 
 mode = sys.argv[1]
 jsonArg = json.loads(sys.argv[2])
@@ -12,7 +13,7 @@ jsonArg = json.loads(sys.argv[2])
 
 def curl_github_args(token, url):
     """Query the github API via curl"""
-    yield "curl"
+    yield bins["curl"]
     if not debug:
         yield "--silent"
     if token:
@@ -36,7 +37,7 @@ def curl_result(orga, repo, output):
 
 def nix_prefetch_args(url, version_rev):
     """Prefetch a git repository"""
-    yield "nix-prefetch-git"
+    yield bins["nix-prefetch-git"]
     if not debug:
         yield "--quiet"
     yield "--no-deepClone"