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/audio/spotify/update.sh

@@ -0,0 +1,88 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -i bash -p curl jq git gnused gnugrep
+
+
+# executing this script without arguments will
+# - find the newest stable spotify version avaiable on snapcraft (https://snapcraft.io/spotify)
+# - read the current spotify version from the current nix expression
+# - update the nix expression if the versions differ
+# - try to build the updated version, exit if that fails
+# - give instructions for upstreaming
+
+# Please test the update manually before pushing. There have been errors before
+# and because the service is proprietary and a paid account is necessary to do
+# anything with spotify automatic testing is not possible.
+
+# As an optional argument you can specify the snapcraft channel to update to.
+# Default is `stable` and only stable updates should be pushed to nixpkgs. For
+# testing you may specify `candidate` or `edge`.
+
+
+channel="${1:-stable}" # stable/candidate/edge
+nixpkgs="$(git rev-parse --show-toplevel)"
+spotify_nix="$nixpkgs/pkgs/applications/audio/spotify/default.nix"
+
+
+#
+# find the newest stable spotify version avaiable on snapcraft
+#
+
+# create bash array from snap info
+snap_info=($(
+  curl -s -H 'X-Ubuntu-Series: 16' \
+    "https://api.snapcraft.io/api/v1/snaps/details/spotify?channel=$channel" \
+  | jq --raw-output \
+    '.revision,.download_sha512,.version,.last_updated'
+))
+
+# "revision" is the actual version identifier on snapcraft, the "version" is
+# just for human consumption. Revision is just an integer that gets increased
+# by one every (stable or unstable) release.
+revision="${snap_info[0]}"
+sha512="${snap_info[1]}"
+upstream_version="${snap_info[2]}"
+last_updated="${snap_info[3]}"
+
+echo "Latest $channel release is $upstream_version from $last_updated."
+
+#
+# read the current spotify version from the currently *committed* nix expression
+#
+
+current_nix_version=$(
+  grep 'version\s*=' "$spotify_nix" \
+  | sed -Ene 's/.*"(.*)".*/\1/p'
+)
+
+echo "Current nix version: $current_nix_version"
+
+#
+# update the nix expression if the versions differ
+#
+
+if [[ "$current_nix_version" = "$upstream_version" ]]; then
+  echo "Spotify is already up-to-date"
+  exit 0
+fi
+
+echo "Updating from ${current_nix_version} to ${upstream_version}, released on ${last_updated}"
+
+# search-and-replace revision, hash and version
+sed --regexp-extended \
+  -e 's/rev\s*=\s*"[0-9]+"\s*;/rev = "'"${revision}"'";/' \
+  -e 's/sha512\s*=\s*"[^"]*"\s*;/sha512 = "'"${sha512}"'";/' \
+  -e 's/version\s*=\s*".*"\s*;/version = "'"${upstream_version}"'";/' \
+  -i "$spotify_nix"
+
+#
+# try to build the updated version
+#
+
+if ! nix-build -A spotify "$nixpkgs"; then
+  echo "The updated spotify failed to build."
+  exit 1
+fi
+
+# Commit changes
+git add "$spotify_nix"
+git commit -m "spotify: ${current_nix_version} -> ${upstream_version}"