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/security/oath-toolkit/update.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl git gnugrep nix
+
+set -euo pipefail
+
+nixfile='default.nix'
+release_url='https://download.savannah.nongnu.org/releases/oath-toolkit/'
+attr='oath-toolkit'
+command='oathtool --version'
+
+color() {
+    printf '%s: \033[%sm%s\033[39m\n' "$0" "$1" "$2" >&2 || true
+}
+
+color 32 "downloading $release_url..."
+if ! release_page=$(curl -Lf "$release_url"); then
+    color 31 "cannot download release page"
+    exit 1
+fi
+
+tarball_name=$(printf '%s\n' "$release_page" \
+    | grep -Po '(?<=href=").*?\.tar\.gz(?=")' \
+    | sort -n | tail -n1)
+tarball_version="${tarball_name%.tar.*}"
+tarball_version="${tarball_version##*-}"
+tarball_url="mirror://savannah${release_url#https://*/releases}$tarball_name"
+
+color 32 "nix-prefetch-url $tarball_url..."
+if ! tarball_sha256=$(nix-prefetch-url --type sha256 "$tarball_url"); then
+    color 31 "cannot prefetch $tarball_url"
+    exit 1
+fi
+
+old_version=$(grep -Pom1 '(?<=version = ").*?(?=";)' "$nixfile")
+
+version=$(printf 'version = "%s";\n' "$tarball_version")
+sha256=$(printf 'sha256 = "%s";\n' "$tarball_sha256")
+sed -e "s,version = .*,$version," -e "s,sha256 = .*,$sha256," -i "$nixfile"
+
+if git diff --exit-code "$nixfile" > /dev/stderr; then
+    printf '\n' >&2 || true
+    color 32 "$tarball_version is up to date"
+else
+    color 32 "running '$command' with nix-shell..."
+    nix-shell -p "callPackage ./$nixfile {}" --run "$command"
+    msg="$attr: $old_version -> $tarball_version"
+    printf '\n' >&2 || true
+    color 31 "$msg"
+    git commit -m "$msg" "$nixfile"
+fi