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backup: add image prefetch function to verify latest image is used

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DerLinkman 2025-12-10 08:43:04 +01:00
parent e76f5237ed
commit d977ddb501
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38
helper-scripts/backup_and_restore.sh
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@ -91,6 +91,44 @@ if grep --help 2>&1 | head -n 1 | grep -q -i "busybox"; then
exit 1
fi
# Add image prefetch function
function prefetch_image() {
echo "Checking Docker image: ${DEBIAN_DOCKER_IMAGE}"
# Get local image digest if it exists
local local_digest=$(docker image inspect ${DEBIAN_DOCKER_IMAGE} --format='{{index .RepoDigests 0}}' 2>/dev/null | cut -d'@' -f2)
# Get remote image digest without pulling
local remote_digest=$(docker manifest inspect ${DEBIAN_DOCKER_IMAGE} 2>/dev/null | grep -oP '"digest":\s*"\K[^"]+' | head -1)
if [[ -z "${remote_digest}" ]]; then
echo "Warning: Unable to check remote image"
if [[ -n "${local_digest}" ]]; then
echo "Using cached version"
echo
return 0
else
echo "Error: Image ${DEBIAN_DOCKER_IMAGE} not found locally or remotely"
exit 1
fi
fi
if [[ "${local_digest}" != "${remote_digest}" ]]; then
echo "Image update available, pulling ${DEBIAN_DOCKER_IMAGE}"
if docker pull ${DEBIAN_DOCKER_IMAGE} 2>/dev/null; then
echo "Successfully pulled ${DEBIAN_DOCKER_IMAGE}"
else
echo "Error: Failed to pull ${DEBIAN_DOCKER_IMAGE}"
exit 1
fi
else
echo "Image is up to date (${remote_digest:0:12}...)"
fi
echo
}
# Prefetch the image early in the script
prefetch_image
function backup() {
DATE=$(date +"%Y-%m-%d-%H-%M-%S")