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/networking/v2ray/update.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl jq
+set -eo pipefail
+cd "$(dirname "${BASH_SOURCE[0]}")"
+
+version_nix=./default.nix
+deps_nix=./deps.nix
+nixpkgs=../../../..
+
+old_core_rev=$(sed -En 's/.*\bversion = "(.*?)".*/\1/p' "$version_nix")
+echo "Current version:" >&2
+echo "core: $old_core_rev" >&2
+
+function fetch_latest_rev {
+    curl "https://api.github.com/repos/v2fly/$1/releases" |
+        jq '.[0].tag_name' --raw-output
+}
+
+core_rev=$(fetch_latest_rev 'v2ray-core')
+core_rev=${core_rev:1}
+echo "Latest version:" >&2
+echo "core: $core_rev" >&2
+
+if [[ $core_rev != $old_core_rev ]]; then
+    echo "Prefetching core..." >&2
+    { read hash; read store_path; } < <(
+        nix-prefetch-url --unpack --print-path "https://github.com/v2fly/v2ray-core/archive/v$core_rev.zip"
+    )
+
+    sed --in-place \
+        -e "s/\bversion = \".*\"/version = \"$core_rev\"/" \
+        -e "s/\bsha256 = \".*\"/sha256 = \"$hash\"/" \
+        -e "s/\bvendorSha256 = \".*\"/vendorSha256 = \"0000000000000000000000000000000000000000000000000000\"/" \
+        "$version_nix"
+fi
+
+echo "Prebuilding..." >&2
+set +o pipefail
+vendorSha256=$(
+    nix-build "$nixpkgs" -A v2ray --no-out-link 2>&1 |
+    tee /dev/stderr |
+    sed -nE 's/.*got:\s*(sha256\S+)$/\1/p'
+)
+[[ "$vendorSha256" ]]
+sed --in-place \
+    -e "s#vendorSha256 = \".*\"#vendorSha256 = \"$vendorSha256\"#" \
+    "$version_nix"
+
+echo "vendorSha256 updated" >&2