choverlay - create an overlay fs of current directory immediately so you can do naughty experiments.
choverlayx - restore to original directory.
use flag -s if you want to create overlay using superuser mount.
a.k.a. copy-on-write file system.
sudo apt install fuse_overlayfs
like running containers yourself by doing many overlays:
sudo apt install debootstrap schroot
. choverlay.sh
C=openjdk:14 &&
docker pull ${C} &&
cd $(mktemp -d) &&
docker save ${C} | tar xf - &&
CFG=$(cat manifest.json | jq -r '.[0].Config') &&
TARS=$(cat manifest.json | jq -r '.[0].Layers | join(" ")' | xargs readlink -f) &&
ENV=$(cat ${CFG} | jq -r '.config.Env | join(" ")') &&
cd $(mktemp -d) &&
for TAR in ${TARS}; do
choverlay -s && pwd && sudo tar xf ${TAR}
done &&
## how to load ${ENV}???
sudo chroot . /bin/sh -c "LD_LIBRARY_PATH=./usr/java/openjdk-14/lib javac --version" &&
for TAR in ${TARS}; do
choverlayx -s
done
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