Module-ify lilliput (#75)

Replace dep symlinks with copies of the target

Go modules don't handle symlinks well due to
golang/go#39417.

This hacky fix works around the issue by replacing symlinks with regular
files.

deps/build-deps-linux.sh

@@ -95,3 +95,10 @@ cd $BUILDDIR/ffmpeg
 $BASEDIR/ffmpeg/configure --prefix=$PREFIX --disable-doc --disable-programs --disable-everything --enable-demuxer=mov --enable-demuxer=matroska --enable-demuxer=aac --enable-demuxer=flac --enable-demuxer=mp3 --enable-demuxer=ogg --enable-demuxer=wav --enable-decoder=mpeg4 --enable-decoder=h264 --enable-decoder=vp9 --enable-decoder=vp8 --enable-decoder=flac --enable-decoder=mp3 --enable-decoder=aac --enable-decoder=vorbis --disable-iconv --disable-cuda --disable-cuvid --disable-nvenc --disable-xlib
 make
 make install
+
+# Since go modules don't currently download symlinked files
+# (see https://github.com/golang/go/issues/39417)
+# we replace symlinks with copies of the target.
+# We use a `find -exec` with a separate file because POSIX sh
+# is that much more limited than bash.
+find "$PREFIX" -type l -exec "${BASEDIR}/copy-symlink-target.sh" {} \;

deps/build-deps-osx.sh

@@ -95,3 +95,10 @@ cd $BUILDDIR/ffmpeg
 $BASEDIR/ffmpeg/configure --prefix=$PREFIX --disable-doc --disable-programs --disable-everything --enable-demuxer=mov --enable-demuxer=matroska --enable-demuxer=aac --enable-demuxer=flac --enable-demuxer=mp3 --enable-demuxer=ogg --enable-demuxer=wav --enable-decoder=mpeg4 --enable-decoder=h264 --enable-decoder=vp9 --enable-decoder=vp8 --enable-decoder=flac --enable-decoder=mp3 --enable-decoder=aac --enable-decoder=vorbis --disable-iconv
 make
 make install
+
+# Since go modules don't currently download symlinked files
+# (see https://github.com/golang/go/issues/39417)
+# we replace symlinks with copies of the target.
+# We use a `find -exec` with a separate file because POSIX sh
+# is that much more limited than bash.
+find "$PREFIX" -type l -exec "${BASEDIR}/copy-symlink-target.sh" {} \;

deps/copy-symlink-target.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+set -eu
+
+main() {
+  symlink="$1"
+  target="$(readlink -f "$symlink")"
+
+  rm "$symlink"
+  cp "$target" "$symlink"
+}
+
+main "$1"

go.mod

@@ -0,0 +1,3 @@
+module github.com/discordapp/lilliput
+
+go 1.15

package.go

@@ -0,0 +1 @@
+package lilliput // import "github.com/discordapp/lilliput"