uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/applications/science/electronics/picoscope/update.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env nix-shell
+#!nix-shell --pure -i python3 -p "python3.withPackages (ps: with ps; [ requests ])"
+import json
+import os
+import requests
+import sys
+
+def parse_packages(text):
+    res = []
+    for package in resp.text.split("\n\n"):
+        if not package: continue
+        pkg = {}
+        for field in package.split("\n"):
+            if field.startswith(" "): # multiline string
+                pkg[k] += "\n" + field[1:]
+            else:
+                [k, v] = field.split(": ", 1)
+                pkg[k] = v
+        res.append(pkg)
+    return res
+
+def generate_sources(packages):
+    sources_spec = {}
+    for pkg in pkgs:
+        sources_spec[pkg['Package']] = {
+            "url": "https://labs.picotech.com/rc/picoscope7/debian/" + pkg["Filename"],
+            "sha256": pkg["SHA256"],
+            "version": pkg["Version"]
+        }
+    return sources_spec
+
+out = {}
+for nix_system, release in {"x86_64-linux": "amd64"}.items():
+    resp = requests.get("https://labs.picotech.com/rc/picoscope7/debian//dists/picoscope/main/binary-"+release+"/Packages")
+    if resp.status_code != 200:
+        print("error: could not fetch data for release {} (code {})".format(release, resp.code), file=sys.stderr)
+        sys.exit(1)
+    pkgs = parse_packages(resp.text)
+    out[nix_system] = generate_sources(pkgs)
+
+with open(os.path.dirname(__file__) + "/sources.json", "w") as f:
+    json.dump(out, f, indent=2, sort_keys=True)
+    f.write('\n')
+