Utilize multi-stage builds

* Multi-Stage builds (docker-engine >=17.05.0 required)
* Bootstrap image changed from busybox to alpine
* Verifies the GPG signatures during bootstrap
* Single build.sh to define builds via a TARGET environment variable
* Add x86-hardened
* Travis CI integration

1 files changed, 32 insertions, 0 deletions

diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..233a802
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# Used to create Gentoo stage3 and portage containers simply by specifying a 
+# TARGET env variable.
+# Example usage: TARGET=stage-amd64 ./build.sh
+
+
+# Split the TARGET variable into three elements separated by hyphens
+IFS=- read -r NAME ARCH SUFFIX <<< "${TARGET}"
+
+# Ensure upstream directories for stage3-amd64-hardened+nomultilib work
+SUFFIX=${SUFFIX/-/+}
+
+VERSION=${VERSION:-$(date -u +%Y%m%d)}
+
+ORG=${ORG:-gentoo}
+
+# x86 requires the i686 subfolder
+if [[ "${ARCH}" == "x86" ]]; then
+	MICROARCH="i686"
+	BOOTSTRAP="multiarch/alpine:x86-v3.5"
+else
+	MICROARCH="${ARCH}"
+fi
+
+# Prefix the suffix with a hyphen to make sure the URL works
+if [[ -n "${SUFFIX}" ]]; then
+	SUFFIX="-${SUFFIX}"
+fi
+
+docker build --build-arg ARCH="${ARCH}" --build-arg MICROARCH="${MICROARCH}" --build-arg BOOTSTRAP="${BOOTSTRAP}" --build-arg SUFFIX="${SUFFIX}"  -t "${ORG}/${TARGET}:${VERSION}" -f "${NAME}.Dockerfile" .
+docker tag "${ORG}/${TARGET}:${VERSION}" "${ORG}/${TARGET}:latest"