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/tools/misc/btdu/update.py

@@ -0,0 +1,82 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i python -p python39Packages.requests
+
+import requests
+import subprocess
+
+pkgbuild = requests.get('https://aur.archlinux.org/cgit/aur.git/plain/PKGBUILD?h=btdu').text
+
+def grabDepVersions(depDict, pkgbuild=pkgbuild):
+    for line in pkgbuild.split('\n'):
+        if depDict["string"] in line:
+            start = len(depDict["string"]) + 1
+            depDict["version"] = line[start:]
+            break
+
+def grabDepHashes(key,pkgbuild=pkgbuild):
+    start = pkgbuild.find(key) + len(key)
+    end = start+64
+    hashes = []
+    for i in range(5):
+        hashes.append(pkgbuild[start:end])
+        start     = pkgbuild.find("'",end+1) + 1
+        end       = start+64
+    return hashes
+
+def findLine(key,derivation):
+    count = 0
+    lines = []
+    for line in derivation:
+        if key in line:
+            lines.append(count)
+        count += 1
+    return lines
+
+def updateVersions(btdu,ae,btrfs,ncurses,containers,derivation):
+    key = "let"
+    line = findLine(key,derivation)[0] + 1
+    derivation[line+0] = f'    _d_ae_ver              = "{ae["version"]}";\n'
+    derivation[line+1] = f'    _d_btrfs_ver           = "{btrfs["version"]}";\n'
+    derivation[line+2] = f'    _d_ncurses_ver         = "{ncurses["version"]}";\n'
+    derivation[line+3] = f'    _d_emsi_containers_ver = "{containers["version"]}";\n'
+
+    key = "version = "
+    line = findLine(key,derivation)[0]
+    derivation[line] = f'    version = "{btdu["version"]}";\n'
+
+    return derivation
+
+def updateHashes(btdu,ae,btrfs,ncurses,containers,derivation):
+    key = "sha256 = "
+    hashLines = findLine(key,derivation)
+    for i in range(len(hashes)):
+        derivation[hashLines[i]] = f'        sha256 = "{hashes[i]}";\n'
+
+    return derivation
+
+if __name__ == "__main__":
+
+    btdu       = {"string": "pkgver"}
+    ae         = {"string": "_d_ae_ver"}
+    btrfs      = {"string": "_d_btrfs_ver"}
+    ncurses    = {"string": "_d_ncurses_ver"}
+    containers = {"string": "_d_emsi_containers_ver"}
+
+    grabDepVersions(btdu)
+    grabDepVersions(ae)
+    grabDepVersions(btrfs)
+    grabDepVersions(ncurses)
+    grabDepVersions(containers)
+
+    hashes = grabDepHashes("sha256sums=('")
+
+    nixpkgs = subprocess.check_output(["git", "rev-parse", "--show-toplevel"]).decode("utf-8").strip('\n')
+    btduFolder = "/pkgs/tools/misc/btdu/"
+    with open(nixpkgs + btduFolder + "default.nix", 'r') as arq:
+        derivation = arq.readlines()
+
+    derivation = updateVersions(btdu,ae,btrfs,ncurses,containers,derivation)
+    derivation = updateHashes(btdu,ae,btrfs,ncurses,containers,derivation)
+
+    with open(nixpkgs + btduFolder + "default.nix", 'w') as arq:
+        arq.writelines(derivation)