Fix Ubuntu OpenJPEG provisioning (#113)

tools/install_openjpeg_2_5_4.sh

@@ -0,0 +1,47 @@
+#!/bin/sh
+
+set -eu
+
+OPENJPEG_VERSION=2.5.4
+OPENJPEG_COMMIT=6c4a29b00211eb0430fa0e5e890f1ce5c80f409f
+
+if [ "$#" -ne 1 ] || [ -z "$1" ]; then
+    echo "usage: $0 INSTALL_PREFIX" >&2
+    exit 2
+fi
+
+install_prefix=$1
+pkg_config_path="$install_prefix/lib/pkgconfig"
+
+if [ -f "$pkg_config_path/libopenjp2.pc" ] &&
+    PKG_CONFIG_PATH="$pkg_config_path" pkg-config --exact-version "$OPENJPEG_VERSION" libopenjp2
+then
+    exit 0
+fi
+
+work_dir=$(mktemp -d "${TMPDIR:-/tmp}/metacrate-openjpeg.XXXXXX")
+trap 'rm -rf "$work_dir"' EXIT HUP INT TERM
+
+source_dir="$work_dir/source"
+build_dir="$work_dir/build"
+
+git clone --branch "v$OPENJPEG_VERSION" --depth 1 \
+    https://github.com/uclouvain/openjpeg.git "$source_dir"
+
+actual_commit=$(git -C "$source_dir" rev-parse HEAD)
+if [ "$actual_commit" != "$OPENJPEG_COMMIT" ]; then
+    echo "OpenJPEG v$OPENJPEG_VERSION resolved to unexpected commit $actual_commit" >&2
+    exit 1
+fi
+
+cmake -S "$source_dir" -B "$build_dir" \
+    -DBUILD_CODEC=OFF \
+    -DBUILD_SHARED_LIBS=ON \
+    -DBUILD_TESTING=OFF \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_INSTALL_LIBDIR=lib \
+    -DCMAKE_INSTALL_PREFIX="$install_prefix"
+cmake --build "$build_dir" --parallel
+cmake --install "$build_dir"
+
+PKG_CONFIG_PATH="$pkg_config_path" pkg-config --exact-version "$OPENJPEG_VERSION" libopenjp2