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tesseract: make tessdata a fix output derivation (#41227)

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the full tessdata is nearly a GB, so sparing a copy each time we need to
rebuild tesseract without updating tessdata is worth it.
This commit is contained in:
symphorien 2018-06-18 22:03:48 +00:00 committed by xeji
parent 8807039549
commit b30d52905e
1 changed files with 34 additions and 30 deletions
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64
pkgs/applications/graphics/tesseract/default.nix
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@ -1,10 +1,38 @@
{ stdenv, fetchFromGitHub, autoreconfHook, pkgconfig
, leptonica, libpng, libtiff, icu, pango, opencl-headers
# Supported list of languages or `null' for all available languages
, enableLanguages ? null
# if you want just a specific list of languages, optionally specify a hash
# to make tessdata a fixed output derivation.
, enableLanguagesHash ? (if enableLanguages == null # all languages
then "1h48xfzabhn0ldbx5ib67cp9607pr0zpblsy8z6fs4knn0zznfnw"
else null)
}:
let tessdata = stdenv.mkDerivation ({
name = "tessdata";
src = fetchFromGitHub {
owner = "tesseract-ocr";
repo = "tessdata";
rev = "3cf1e2df1fe1d1da29295c9ef0983796c7958b7d";
# when updating don't forget to update the default value fo enableLanguagesHash
sha256 = "1v4b63v5nzcxr2y3635r19l7lj5smjmc9vfk0wmxlryxncb4vpg7";
};
buildCommand = ''
cd $src;
for lang in ${if enableLanguages==null then "*.traineddata" else stdenv.lib.concatMapStringsSep " " (x: x+".traineddata") enableLanguages} ; do
install -Dt $out/share/tessdata $src/$lang ;
done;
'';
preferLocalBuild = true;
} // (stdenv.lib.optionalAttrs (enableLanguagesHash != null) {
# when a hash is given, we make this a fixed output derivation.
outputHashMode = "recursive";
outputHashAlgo = "sha256";
outputHash = enableLanguagesHash;
}));
in
stdenv.mkDerivation rec {
name = "tesseract-${version}";
version = "3.05.00";
@ -16,41 +44,17 @@ stdenv.mkDerivation rec {
sha256 = "11wrpcfl118wxsv2c3w2scznwb48c4547qml42s2bpdz079g8y30";
};
tessdata = fetchFromGitHub {
owner = "tesseract-ocr";
repo = "tessdata";
rev = "3cf1e2df1fe1d1da29295c9ef0983796c7958b7d";
sha256 = "1v4b63v5nzcxr2y3635r19l7lj5smjmc9vfk0wmxlryxncb4vpg7";
};
enableParallelBuilding = true;
nativeBuildInputs = [ pkgconfig autoreconfHook ];
buildInputs = [ leptonica libpng libtiff icu pango opencl-headers ];
LIBLEPT_HEADERSDIR = "${leptonica}/include";
# Copy the .traineddata files of the languages specified in enableLanguages
# into `$out/share/tessdata' and check afterwards if copying was successful.
postInstall = let
mkArg = lang: "-iname ${stdenv.lib.escapeShellArg "${lang}.traineddata"}";
mkFindArgs = stdenv.lib.concatMapStringsSep " -o " mkArg;
findLangArgs = if enableLanguages != null
then "\\( ${mkFindArgs enableLanguages} \\)"
else "-iname '*.traineddata'";
in ''
numLangs="$(find "$tessdata" -mindepth 1 -maxdepth 1 -type f \
${findLangArgs} -exec cp -t "$out/share/tessdata" {} + -print | wc -l)"
${if enableLanguages != null then ''
expected=${toString (builtins.length enableLanguages)}
'' else ''
expected="$(ls -1 "$tessdata/"*.traineddata | wc -l)"
''}
if [ "$numLangs" -ne "$expected" ]; then
echo "Expected $expected languages, but $numLangs" \
"were copied to \`$out/share/tessdata'" >&2
exit 1
fi
postInstall = ''
for i in ${tessdata}/share/tessdata/*; do
ln -s $i $out/share/tessdata;
done
'';
meta = {