add initial bash and busybox

Makefile

@@ -0,0 +1,11 @@
+out/gcc.oci.tgz:
+	docker build -f packages/gcc/Dockerfile -t ocirep/gcc .
+
+out/bash.oci.tgz:
+	docker build -f packages/bash/Dockerfile -t ocirep/bash .
+
+out/busybox.oci.tgz:
+	docker build -f packages/busybox/Dockerfile -t ocirep/busybox .
+
+out/go.oci.tgz:
+	docker build -f packages/go/Dockerfile -t ocirep/go .

packages/bash/Dockerfile

@@ -0,0 +1,16 @@
+ARG GCC_IMAGE=library/gcc@sha256:ca38f292fe1ad0933f0122a657f9c644ed1f0a9e1aa336abcc83d420ad487e28
+
+FROM ${GCC_IMAGE} as build
+ENV SOURCE_SITE=https://ftp.gnu.org/gnu/bash
+ENV SOURCE_VERSION=5.2.15
+ENV SOURCE_HASH=13720965b5f4fc3a0d4b61dd37e7565c741da9a5be24edc2ae00182fc1b3588c
+RUN wget ${SOURCE_SITE}/bash-${SOURCE_VERSION}.tar.gz
+RUN echo "${SOURCE_HASH} bash-${SOURCE_VERSION}.tar.gz" | sha256sum -c
+RUN tar -xzf bash-${SOURCE_VERSION}.tar.gz
+RUN \
+    cd bash-${SOURCE_VERSION} \
+    && ./configure --enable-static-link \
+    && make install
+
+FROM scratch
+COPY --from=build /usr/local/bin/bash /

packages/busybox/Dockerfile

@@ -0,0 +1,63 @@
+ARG GCC_IMAGE=library/gcc@sha256:ca38f292fe1ad0933f0122a657f9c644ed1f0a9e1aa336abcc83d420ad487e28
+
+FROM ${GCC_IMAGE} as build
+ENV SOURCE_SITE=https://busybox.net/downloads
+ENV SOURCE_VERSION=1.36.1
+ENV SOURCE_HASH=b8cc24c9574d809e7279c3be349795c5d5ceb6fdf19ca709f80cde50e47de314
+RUN wget ${SOURCE_SITE}/busybox-${SOURCE_VERSION}.tar.bz2
+RUN echo "${SOURCE_HASH} busybox-${SOURCE_VERSION}.tar.bz2" | sha256sum -c
+RUN tar -xjf busybox-${SOURCE_VERSION}.tar.bz2
+WORKDIR busybox-${SOURCE_VERSION}
+RUN set -eux; \
+	setConfs=' \
+		CONFIG_AR=y \
+		CONFIG_FEATURE_AR_CREATE=y \
+		CONFIG_FEATURE_AR_LONG_FILENAMES=y \
+		CONFIG_LAST_SUPPORTED_WCHAR=0 \
+		CONFIG_STATIC=y \
+	'; \
+	unsetConfs=' \
+		CONFIG_FEATURE_SYNC_FANCY \
+		CONFIG_FEATURE_HAVE_RPC \
+		CONFIG_FEATURE_INETD_RPC \
+		CONFIG_FEATURE_UTMP \
+		CONFIG_FEATURE_WTMP \
+	'; \
+	make defconfig; \
+	for conf in $unsetConfs; do \
+		sed -i \
+			-e "s!^$conf=.*\$!# $conf is not set!" \
+			.config; \
+	done; \
+	for confV in $setConfs; do \
+		conf="${confV%=*}"; \
+		sed -i \
+			-e "s!^$conf=.*\$!$confV!" \
+			-e "s!^# $conf is not set\$!$confV!" \
+			.config; \
+		if ! grep -q "^$confV\$" .config; then \
+			echo "$confV" >> .config; \
+		fi; \
+	done; \
+	make oldconfig; \
+	for conf in $unsetConfs; do \
+		! grep -q "^$conf=" .config; \
+	done; \
+	for confV in $setConfs; do \
+		grep -q "^$confV\$" .config; \
+	done
+
+RUN make
+RUN cp ./busybox /
+
+FROM scratch
+COPY --from=build /busybox .
+RUN ["/busybox","mkdir","/bin"]
+RUN ["/busybox","--install","-s","/bin"]
+RUN echo "nogroup:*:100:nobody" > /etc/group
+RUN echo "nobody:*:100:100:::" > /etc/passwd
+RUN mkdir /tmp
+RUN chown -R 100:100 /tmp
+WORKDIR /tmp
+USER 100:100
+ENTRYPOINT ["/bin/sh"]