bazel: remote oci rules, packer building

Container building in Bazel seems like a dead end right now. This is
removed.

I'm splitting out a separate packer build script from the run-docker
script.

packer/README.md

@@ -3,6 +3,12 @@
 This directory contains the tooling to build raspberry pi images using
 packer.
 
+- `install-packer.sh` will set up packer and packer-builder-arm. It will 
+  also install additional dependencies assuming a Debian-ish system. This
+  is mostly intended for use in containers, as my Ansible config should
+  cover this for hardware.
+- `run-docker.sh` runs the builder in Docker.
+
 
 ### Resources
 

packer/build-image.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+set -euxo pipefail
+
+IMAGE_TYPE="${1:-ubuntu}"
+PACKER_BUILD_FILE=
+
+errmsg () {
+    echo "$@" > /dev/stderr
+}
+
+preflight () {
+    case "${IMAGE_TYPE}" in 
+    ubuntu) PACKER_BUILD_FILE="boards/raspberry-pi-4/ubuntu_server_20.04_arm64.json" ;;
+    raspbian) PACKER_BUILD_FILE="boards/raspberry-pi/raspios-lite-arm.json" ;;
+    custom)
+        PACKER_BUILD_FILE="${2:-}"
+        if [ -z "${PACKER_BUILD_FILE}" ]
+        then
+            errmsg "[!] custom board requires a board file path"
+            exit 1
+        fi
+        ;;
+    *)
+        errmsg "[!] invalid image type ${IMAGE_TYPE}."
+        errmsg "[!] valid image types are"
+        errmsg "    - raspbian"
+        errmsg "    - ubuntu"
+        errmsg "    - custom path/to/board/file"
+        exit 1
+        ;;
+    esac
+}
+
+build_image () {
+    packer build ${PACKER_BUILD_FILE}
+}

packer/run-docker.sh

@@ -2,46 +2,18 @@
 
 set -euxo pipefail
 
-IMAGE_TYPE="${1:-ubuntu}"
 PACKER_IMAGE_NAME="bladerunner/packer:latest"
-PACKER_BUILD_FILE=
-
-errmsg () {
-    echo "$@" > /dev/stderr
-}
 
 preflight () {
-    case "${IMAGE_TYPE}" in 
-    ubuntu) PACKER_BUILD_FILE="boards/raspberry-pi-4/ubuntu_server_20.04_arm64.json" ;;
-    raspbian) PACKER_BUILD_FILE="boards/raspberry-pi/raspios-lite-arm.json" ;;
-    custom)
-        PACKER_BUILD_FILE="${2:-}"
-        if [ -z "${PACKER_BUILD_FILE}" ]
-        then
-            errmsg "[!] custom board requires a board file path"
-            exit 1
-        fi
-        ;;
-    *)
-        errmsg "[!] invalid image type ${IMAGE_TYPE}."
-        errmsg "[!] valid image types are"
-        errmsg "    - raspbian"
-        errmsg "    - ubuntu"
-        errmsg "    - custom path/to/board/file"
-        exit 1
-        ;;
-    esac
-
     if [ -z "$(docker image ls -q ${PACKER_IMAGE_NAME})" ]
     then
         docker image build -t "${PACKER_IMAGE_NAME}" .
     fi
-
 }
 
 run_image () {
     # privileged is required for loopback devices
-    docker run --privileged=true -i -t -v build:/packer/build -v /dev:/dev ${PACKER_IMAGE_NAME} -c "packer build ${PACKER_BUILD_FILE}"
+    docker run --privileged=true -i -t -v build:/packer/build -v /dev:/dev ${PACKER_IMAGE_NAME} -c "./build-image.sh"
 }
 
 preflight