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/build-support/fetchcvs/builder.sh

@@ -0,0 +1,27 @@
+source $stdenv/setup
+
+(echo "#!$SHELL"; \
+ echo 'ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no "$@"') > ssh
+chmod +x ssh
+export CVS_RSH=$PWD/ssh
+
+# creating the export drictory and checking out there only to be able to
+# move the content without the root directory into $out ...
+# cvs -f -d "$url" export $tag -d "$out" "$module"
+# should work (but didn't - got no response on #cvs)
+# See als man Page for those options
+
+mkdir -p export
+if [ -n "$tag" ]; then
+    tag="-r $tag"
+else
+    if [ -n "$date" ]; then
+        tag="-D $date"
+    else
+        tag="-D NOW"
+    fi
+fi
+(cd export && cvs -f -z0 -d "$cvsRoot" export $tag "$module")
+mv export/* $out
+
+stopNest

pkgs/build-support/fetchcvs/default.nix

@@ -0,0 +1,20 @@
+# example tags:
+# date="2007-20-10"; (get the last version before given date)
+# tag="<tagname>" (get version by tag name)
+# If you don't specify neither one date="NOW" will be used (get latest)
+
+{stdenvNoCC, cvs, openssh}:
+
+{cvsRoot, module, tag ? null, date ? null, sha256}:
+
+stdenvNoCC.mkDerivation {
+  name = "cvs-export";
+  builder = ./builder.sh;
+  nativeBuildInputs = [cvs openssh];
+
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = sha256;
+
+  inherit cvsRoot module sha256 tag date;
+}

pkgs/build-support/fetchcvs/nix-prefetch-cvs

@@ -0,0 +1,82 @@
+#! /bin/sh -e
+
+cvsRoot=$1
+module=$2
+tag=$3
+expHash=$4
+
+hashType=$NIX_HASH_ALGO
+if test -z "$hashType"; then
+    hashType=sha256
+fi
+
+if test -z "$cvsRoot"; then
+    echo "syntax: nix-prefetch-cvs CVSROOT MODULE [TAG [HASH]]" >&2
+    exit 1
+elif test -z "$module"; then
+    echo "syntax: nix-prefetch-cvs CVSROOT MODULE [TAG [HASH]]" >&2
+    exit 1
+fi
+
+
+mkTempDir() {
+    tmpPath="$(mktemp -d "${TMPDIR:-/tmp}/nix-prefetch-cvs-XXXXXXXX")"
+    trap removeTempDir EXIT SIGINT SIGQUIT
+}
+
+removeTempDir() {
+    if test -n "$tmpPath"; then
+        rm -rf "$tmpPath" || true
+    fi
+}
+
+
+# If the hash was given, a file with that hash may already be in the
+# store.
+if test -n "$expHash"; then
+    finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" cvs-export)
+    if ! nix-store --check-validity "$finalPath" 2> /dev/null; then
+        finalPath=
+    fi
+    hash=$expHash
+fi
+
+
+# If we don't know the hash or a path with that hash doesn't exist,
+# download the file and add it to the store.
+if test -z "$finalPath"; then
+
+    mkTempDir
+    tmpFile=$tmpPath/cvs-export
+    #mkdir $tmpPath
+
+    # Perform the checkout.
+    if test -z "$tag"; then
+        args=(-D "now")
+    elif test "$USE_DATE" = "1"; then
+        args=(-D "$tag")
+    else
+        args=(-r "$tag")
+    fi
+    (cd "$tmpPath" && cvs -f -z0 -d $cvsRoot export "${args[*]}" -d cvs-export $module >&2)
+
+    # Compute the hash.
+    hash=$(nix-hash --type $hashType $hashFormat $tmpFile)
+    if ! test -n "$QUIET"; then echo "hash is $hash" >&2; fi
+
+    # Add the downloaded file to the Nix store.
+    finalPath=$(nix-store --add-fixed --recursive "$hashType" $tmpFile)
+
+    if test -n "$expHash" -a "$expHash" != "$hash"; then
+        echo "hash mismatch for CVS root \`$cvsRoot'"
+        exit 1
+    fi
+fi
+
+if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; fi
+
+echo $hash
+
+if test -n "$PRINT_PATH"; then
+    echo $finalPath
+fi