Backup a development tree to a compressed tar, ignoring cache dirs.

backup-dev.sh

#!/bin/bash

_backupdir='./dev'
_now=`date -Isec | tr -d "\:"`
_archive="./dev.${_now}.tgz"

# WSL2-ism to free disk cache
echo 1 | sudo tee /proc/sys/vm/drop_caches > /dev/null


t=$(mktemp -t ) || exit
trap "rm -f -- '$t'" EXIT

# https://bford.info/cachedir/
cat << EOF >> "${t}"
Signature: 8a477f597d28d172789f06886806bc55
EOF

# tag any cache dirs
find "${_backupdir}" \( -name 'node_modules' -o -name '.venv' \) -type d -readable -executable -exec cp "${t}" "{}/CACHEDIR.TAG" \; -print | sed 's/^\(.*\)/Marking as cache: \1/'

tar --exclude-caches-under --ignore-failed-read --exclude="*.qcow*" --exclude "*.vhdx*" --exclude "*.gguf" -cvzf "${_archive}" "${_backupdir}"