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/fetchsvn/builder.sh

@@ -0,0 +1,25 @@
+source $stdenv/setup
+
+header "exporting $url (r$rev) into $out"
+
+if test -n "$http_proxy"; then
+    # Configure proxy
+    mkdir .subversion
+    proxy="${http_proxy#*://}"
+
+    echo '[global]' > .subversion/servers
+    echo "http-proxy-host = ${proxy%:*}" >> .subversion/servers
+    echo "http-proxy-port = ${proxy##*:}" >> .subversion/servers
+
+    export HOME="$PWD"
+fi;
+
+if test -z "$LC_ALL"; then
+    export LC_ALL="en_US.UTF-8"
+fi;
+
+svn export --trust-server-cert --non-interactive \
+    ${ignoreExternals:+--ignore-externals} ${ignoreKeywords:+--ignore-keywords} \
+    -r "$rev" "$url" "$out"
+
+stopNest

pkgs/build-support/fetchsvn/default.nix

@@ -0,0 +1,54 @@
+{ lib, stdenvNoCC, buildPackages
+, subversion, glibcLocales, sshSupport ? true, openssh ? null
+}:
+
+{ url, rev ? "HEAD", md5 ? "", sha256 ? ""
+, ignoreExternals ? false, ignoreKeywords ? false, name ? null
+, preferLocalBuild ? true
+}:
+
+assert sshSupport -> openssh != null;
+
+let
+  repoName = with lib;
+    let
+      fst = head;
+      snd = l: head (tail l);
+      trd = l: head (tail (tail l));
+      path_ =
+        (p: if head p == "" then tail p else p) # ~ drop final slash if any
+        (reverseList (splitString "/" url));
+      path = [ (removeSuffix "/" (head path_)) ] ++ (tail path_);
+    in
+      # ../repo/trunk -> repo
+      if fst path == "trunk" then snd path
+      # ../repo/branches/branch -> repo-branch
+      else if snd path == "branches" then "${trd path}-${fst path}"
+      # ../repo/tags/tag -> repo-tag
+      else if snd path == "tags" then     "${trd path}-${fst path}"
+      # ../repo (no trunk) -> repo
+      else fst path;
+
+  name_ = if name == null then "${repoName}-r${toString rev}" else name;
+in
+
+if md5 != "" then
+  throw "fetchsvn does not support md5 anymore, please use sha256"
+else
+stdenvNoCC.mkDerivation {
+  name = name_;
+  builder = ./builder.sh;
+  nativeBuildInputs = [ subversion glibcLocales ]
+    ++ lib.optional sshSupport openssh;
+
+  SVN_SSH = if sshSupport then "${buildPackages.openssh}/bin/ssh" else null;
+
+  outputHashAlgo = "sha256";
+  outputHashMode = "recursive";
+  outputHash = sha256;
+
+  inherit url rev ignoreExternals ignoreKeywords;
+
+  impureEnvVars = lib.fetchers.proxyImpureEnvVars;
+  inherit preferLocalBuild;
+}

pkgs/build-support/fetchsvn/nix-prefetch-svn

@@ -0,0 +1,79 @@
+#! /bin/sh -e
+
+url=$1
+rev=$2
+expHash=$3
+
+hashType=$NIX_HASH_ALGO
+if test -z "$hashType"; then
+    hashType=sha256
+fi
+if test -z "$hashFormat"; then
+    hashFormat=--base32
+fi
+
+if test -z "$url"; then
+    echo "syntax: nix-prefetch-svn URL [REVISION [EXPECTED-HASH]]" >&2
+    exit 1
+fi
+
+test -n "$rev" || rev="HEAD"
+
+repoName=$(echo $url | sed '
+  s,.*/\([^/]\+\)/trunk/*$,\1,;t
+  s,.*/\([^/]\+\)/branches/\([^/]\+\)/*$,\1-\2,;t
+  s,.*/\([^/]\+\)/tags/\([^/]\+\)/*$,\1-\2,;t
+  s,.*/\([^/]\+\)/*$,\1,;t
+')
+dstFile=$repoName-r$rev
+
+# If the hash was given, a file with that hash may already be in the
+# store.
+if test -n "$expHash"; then
+    finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" $dstFile)
+    if ! nix-store --check-validity "$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
+    tmpPath="$(mktemp -d "${TMPDIR:-/tmp}/svn-checkout-tmp-XXXXXXXX")"
+    trap "rm -rf \"$tmpPath\"" EXIT
+
+    tmpFile="$tmpPath/$dstFile"
+
+    # Perform the checkout.
+    if test "$NIX_PREFETCH_SVN_LEAVE_DOT_SVN" != 1
+    then
+	command="export"
+    else
+	command="checkout"
+    fi
+
+    echo p | svn "$command" --quiet -r "$rev" "$url" "$tmpFile" >&2
+    echo "svn revision is $(svn info -r "$rev" "$url" | grep "Revision: " | cut -d' ' -f2)"
+
+    # Compute the hash.
+    hash=$(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 URL \`$url'"
+        exit 1
+    fi
+fi
+
+if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; fi
+
+echo $hash
+
+if test -n "$PRINT_PATH"; then
+    echo $finalPath
+fi