run-against-snapshot.sh

#!/usr/bin/env bash

CONTAINER_RUNTIME=${CONTAINER_RUNTIME:-docker}
SNAPSHOT_FILEPATH=${SNAPSHOT_FILEPATH:-$1}

if [[ ! -f $SNAPSHOT_FILEPATH ]]; then
    echo "Cannot find snapshot file. Please call $0 with path to snapshot or set SNAPSHOT_FILEPATH envvar."
    exit 1
fi

root_dir=$(cd "$(dirname "$0")/.."; pwd)
ghwc_image_name="ghwc"
local_git_version=$(git describe --tags --always --dirty)
IMAGE_VERSION=${IMAGE_VERSION:-$local_git_version}

snap_tmp_dir=$(mktemp -d -t ghw-snap-test-XXX)
# needed to enabled PRESERVE and EXCLUSIVE (see README.md)
mkdir -p "$snap_tmp_dir/root"

echo "copying snapshot $SNAPSHOT_FILEPATH to $snap_tmp_dir ..."
cp -L $SNAPSHOT_FILEPATH $snap_tmp_dir

echo "building Docker image with ghwc ..."

${CONTAINER_RUNTIME} build -f $root_dir/Dockerfile -t $ghwc_image_name:$IMAGE_VERSION $root_dir

echo "running ghwc Docker image with volume mount to snapshot dir ..."

# note the trailing ":z" on the "-v" option. We use :z on the host volume mount below to ensure
# the container runtime has the ability to read the contents contained in the host volume.
# podman is especially picky about this.
${CONTAINER_RUNTIME} run -it -v $snap_tmp_dir:/host:z \
	-e GHW_SNAPSHOT_PATH="/host/$( basename $SNAPSHOT_FILEPATH )" \
	-e GHW_SNAPSHOT_PRESERVE=1 \
	-e GHW_SNAPSHOT_EXCLUSIVE=1 \
	-e GHW_SNAPSHOT_ROOT="/host/root" \
	$ghwc_image_name:$IMAGE_VERSION