Zebra/.github/workflows/scripts/gcp-get-cached-disks.sh

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#!/usr/bin/env bash
# Description:
# This script finds a cached Google Cloud Compute image based on specific criteria.
# It prioritizes images from the current commit, falls back to the main branch,
# and finally checks other branches if needed. The selected image is used for
# setting up the environment in a CI/CD pipeline.
set -eo pipefail
# Function to find and report a cached disk image
find_cached_disk_image() {
local search_pattern="${1}"
local git_source="${2}"
local disk_name
disk_name=$(gcloud compute images list --filter="status=READY AND name~${search_pattern}" --format="value(NAME)" --sort-by=~creationTimestamp --limit=1)
# Use >&2 to redirect to stderr and avoid sending wrong assignments to stdout
if [[ -n "${disk_name}" ]]; then
echo "Found ${git_source} Disk: ${disk_name}" >&2
disk_description=$(gcloud compute images describe "${disk_name}" --format="value(DESCRIPTION)")
echo "Description: ${disk_description}" >&2
echo "${disk_name}" # This is the actual return value when a disk is found
else
echo "No ${git_source} disk found." >&2
fi
}
# Extract local state version
echo "Extracting local state version..."
LOCAL_STATE_VERSION=$(grep -oE "DATABASE_FORMAT_VERSION: .* [0-9]+" "${GITHUB_WORKSPACE}/zebra-state/src/constants.rs" | grep -oE "[0-9]+" | tail -n1)
echo "STATE_VERSION: ${LOCAL_STATE_VERSION}"
# Define DISK_PREFIX based on the requiring state directory
if [[ "${NEEDS_LWD_STATE}" == "true" ]]; then
DISK_PREFIX="${LWD_STATE_DIR}"
else
DISK_PREFIX="${ZEBRA_STATE_DIR:-${DISK_PREFIX}}"
fi
# Find the most suitable cached disk image
echo "Finding the most suitable cached disk image..."
if [[ -z "${CACHED_DISK_NAME}" ]]; then
# Try to find a cached disk image from the current commit
COMMIT_DISK_PREFIX="${DISK_PREFIX}-.+-${GITHUB_SHA_SHORT}-v${LOCAL_STATE_VERSION}-${NETWORK}-${DISK_SUFFIX}"
CACHED_DISK_NAME=$(find_cached_disk_image "${COMMIT_DISK_PREFIX}" "commit")
# If no cached disk image is found, try to find one from the main branch
if [[ "${PREFER_MAIN_CACHED_STATE}" == "true" ]]; then
MAIN_DISK_PREFIX="${DISK_PREFIX}-main-[0-9a-f]+-v${LOCAL_STATE_VERSION}-${NETWORK}-${DISK_SUFFIX}"
CACHED_DISK_NAME=$(find_cached_disk_image "${MAIN_DISK_PREFIX}" "main branch")
# Else, try to find one from any branch
else
ANY_DISK_PREFIX="${DISK_PREFIX}-.+-[0-9a-f]+-v${LOCAL_STATE_VERSION}-${NETWORK}-${DISK_SUFFIX}"
CACHED_DISK_NAME=$(find_cached_disk_image "${ANY_DISK_PREFIX}" "any branch")
fi
fi
# Handle case where no suitable disk image is found
if [[ -z "${CACHED_DISK_NAME}" ]]; then
echo "No suitable cached state disk available."
echo "Expected pattern: ${COMMIT_DISK_PREFIX}"
echo "Cached state test jobs must depend on the cached state rebuild job."
exit 1
fi
echo "Selected Disk: ${CACHED_DISK_NAME}"
# Exporting variables for subsequent steps
echo "Exporting variables for subsequent steps..."
export CACHED_DISK_NAME="${CACHED_DISK_NAME}"
export LOCAL_STATE_VERSION="${LOCAL_STATE_VERSION}"