scripts/install-release-image: Helper for launching from an install payload

scripts/install-release-image.sh

@@ -0,0 +1,93 @@
+#!/bin/sh
+#
+# Given a release image, extract the referenced installer and use it
+# to launch a cluster based on that same release image.
+#
+# Usage:
+#
+#   install-release-image.sh [ARG...]
+#
+# Requires:
+#
+# * oc, to extract the installer image
+# * podman, to run the installer image
+# * realpath, which is not in POSIX as a shell command [1], but is in
+#   GNU coreutils [2].  The backing C function is in POSIX [3].
+# * A pull secret in ~/.docker/config.json for both oc and podman.
+#
+# Optional:
+#
+# * ASSETS
+#   The path is mounted into the installer container and used as the
+#   installer's asset directory.  Defaults to the current working
+#   directory.
+# * RELEASE
+#   The pull-spec for the release image.  Defaults to the development
+#   OKD tip.
+# * SSH_PUBKEY
+#   If set, this is mounted into the installer container at
+#   ~/.ssh/key.pub.  Otherwise all ~/.ssh/*.pub are mounted in.
+# * AWS_PROFILE [4]
+#   If set, this is also set in the installer container.
+# * AWS_CONFIG_FILE [4]
+#   This defaults to ~/.aws/config, and, if set to an existing file,
+#   it is mounted into the installer container at ~/.aws/config
+# * AWS_SHARED_CREDENTIALS_FILE [4]
+#   If set, this is mounted into the installer container at
+#   ~/.aws/credentials
+#
+# [1]: http://pubs.opengroup.org/onlinepubs/9699919799/idx/utilities.html
+# [2]: http://man7.org/linux/man-pages/man1/realpath.1.html
+# [3]: http://pubs.opengroup.org/onlinepubs/9699919799/functions/realpath.html
+# [4]: https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-envvars.html
+
+die () {
+	# shellcheck disable=SC2059
+	printf "${@}" >&2
+	exit 1
+}
+
+mkdir -p "${ASSETS:-.}" || die 'failed to create asset directory\n'
+ASSETS="$(realpath -e "${ASSETS:-.}")" || die 'failed to resolve asset path\n'
+RELEASE="${RELEASE:-registry.svc.ci.openshift.org/openshift/origin-release:v4.0}"
+INSTALLER="$(oc adm release info --image-for=installer "${RELEASE}")" || die 'failed to resolve installer image\n'
+set -- --env HOME=/home "${INSTALLER}" "${@}" || die 'failed to insert installer into podman arguments\n'
+if test -n "${SSH_PUBKEY}"
+then
+	SSH_PUBKEY="$(realpath -e "${SSH_PUBKEY}")" || die 'failed to resolve SSH_PUBKEY\n'
+	set -- --volume "${SSH_PUBKEY}:/home/.ssh/id_key.pub:ro,z" "${@}" || die 'failed to insert SSH_PUBKEY into podman arguments\n'
+else
+	for SSH_PUBKEY in ~/.ssh/*.pub
+	do
+		SSH_PUBKEY_FILENAME="$(basename "${SSH_PUBKEY}")" || die 'failed to split filename from %s\n' "${SSH_PUBKEY}"
+		set -- --volume "${SSH_PUBKEY}:/home/.ssh/${SSH_PUBKEY_FILENAME}:ro,z" "${@}" || die 'failed to insert %s into podman arguments\n' "${SSH_PUBKEY}"
+	done
+fi
+
+if test -n "${AWS_PROFILE}"
+then
+	set -- --env AWS_PROFILE="${AWS_PROFILE}" "${@}" || die 'failed to insert AWS_PROFILE into podman arguments\n'
+fi
+
+if test -n "${AWS_CONFIG_FILE}"
+then
+	AWS_CONFIG_FILE="$(realpath -e "${AWS_CONFIG_FILE}")" || die 'failed to resolve AWS_CONFIG_FILE\n'
+else
+	AWS_CONFIG_FILE=~/.aws/config
+fi
+if test -e "${AWS_CONFIG_FILE}"
+then
+	set -- --volume "${AWS_CONFIG_FILE}:/home/.aws/config:ro,z" "${@}" || die 'failed to insert AWS_CONFIG_FILE into podman arguments\n'
+fi
+
+if test -n "${AWS_SHARED_CREDENTIALS_FILE}"
+then
+	AWS_SHARED_CREDENTIALS_FILE="$(realpath -e "${AWS_SHARED_CREDENTIALS_FILE}")" || die 'failed to resolve AWS_SHARED_CREDENTIALS_FILE\n'
+	set -- --volume "${AWS_SHARED_CREDENTIALS_FILE}:/home/.aws/credentials:z" "${@}" || die 'failed to insert AWS_SHARED_CREDENTIALS_FILE into podman arguments\n'
+fi
+
+exec podman run --rm -it \
+	--user "$(id -u):$(id -g)" \
+	--env OPENSHIFT_INSTALL_RELEASE_IMAGE_OVERRIDE="${RELEASE}" \
+	--volume "${ASSETS}:/output:z" \
+	"${@}"