Dockerfile-oracle-oraclelinux.template

FROM oraclelinux:placeholder-slim

RUN set -eux; \
	microdnf install \
		gzip \
		tar \
		\
# jlink --strip-debug on 13+ needs objcopy: https://github.com/docker-library/openjdk/issues/351
# Error: java.io.IOException: Cannot run program "objcopy": error=2, No such file or directory
		binutils \
# java.lang.UnsatisfiedLinkError: /usr/java/openjdk-12/lib/libfontmanager.so: libfreetype.so.6: cannot open shared object file: No such file or directory
# https://github.com/docker-library/openjdk/pull/235#issuecomment-424466077
		freetype fontconfig \
	; \
	microdnf clean all

# Default to UTF-8 file.encoding
ENV LANG C.UTF-8

ENV JAVA_HOME placeholder
ENV PATH $JAVA_HOME/bin:$PATH

# https://jdk.java.net/
# >
# > Java Development Kit builds, from Oracle
# >
ENV JAVA_VERSION placeholder

RUN set -eux; \
	\
	objdump="$(command -v objdump)"; \
	arch="$(objdump --file-headers "$objdump" | awk -F '[:,]+[[:space:]]+' '$1 == "architecture" { print $2 }')"; \
# this "case" statement is generated via "update.sh"
	%%ARCH-CASE%%; \
	\
	curl -fL -o openjdk.tgz "$downloadUrl"; \
	echo "$downloadSha256 *openjdk.tgz" | sha256sum --strict --check -; \
	\
	mkdir -p "$JAVA_HOME"; \
	tar --extract \
		--file openjdk.tgz \
		--directory "$JAVA_HOME" \
		--strip-components 1 \
		--no-same-owner \
	; \
	rm openjdk.tgz; \
	\
# https://github.com/oracle/docker-images/blob/a56e0d1ed968ff669d2e2ba8a1483d0f3acc80c0/OracleJava/java-8/Dockerfile#L17-L19
	ln -sfT "$JAVA_HOME" /usr/java/default; \
	ln -sfT "$JAVA_HOME" /usr/java/latest; \
	for bin in "$JAVA_HOME/bin/"*; do \
		base="$(basename "$bin")"; \
		[ ! -e "/usr/bin/$base" ]; \
		alternatives --install "/usr/bin/$base" "$base" "$bin" 20000; \
	done; \
	\
# https://github.com/docker-library/openjdk/issues/212#issuecomment-420979840
# https://openjdk.java.net/jeps/341
	java -Xshare:dump; \
	\
# see "update-ca-trust" script which creates/maintains this cacerts bundle
	rm -rf "$JAVA_HOME/lib/security/cacerts"; \
	ln -sT /etc/pki/ca-trust/extracted/java/cacerts "$JAVA_HOME/lib/security/cacerts"; \
	\
# basic smoke test
	fileEncoding="$(echo 'System.out.println(System.getProperty("file.encoding"))' | jshell -s -)"; [ "$fileEncoding" = 'UTF-8' ]; rm -rf ~/.java; \
	javac --version; \
	java --version

# "jshell" is an interactive REPL for Java (see https://en.wikipedia.org/wiki/JShell)
CMD ["jshell"]