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61 lines
1.7 KiB
Bash
Executable File
61 lines
1.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Nothing in this script should fail.
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set -e
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CACHE_HASH_FILE="$(realpath "$(dirname "$0")/../zigCacheHash.nix")"
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help() {
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echo ""
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echo "To fix, please (manually) re-run the script from the repository root,"
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echo "commit, and push the update:"
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echo ""
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echo " ./nix/build-support/check-zigCacheHash.sh --update"
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echo " git add nix/zigCacheHash.nix"
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echo " git commit -m \"nix: update Zig cache hash\""
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echo " git push"
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echo ""
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}
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if [ -f "${CACHE_HASH_FILE}" ]; then
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OLD_CACHE_HASH="$(nix eval --raw --file "${CACHE_HASH_FILE}")"
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elif [ "$1" != "--update" ]; then
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echo -e "\nERROR: Zig cache hash file missing."
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help
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exit 1
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fi
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TMP_CACHE_DIR="$(mktemp --directory --suffix nix-zig-cache)"
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# This is not 100% necessary in CI but is helpful when running locally to keep
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# a local workstation clean.
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trap 'rm -rf "${TMP_CACHE_DIR}"' EXIT
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# Run Zig and download the cache to the temporary directory.
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zig build --fetch --global-cache-dir "${TMP_CACHE_DIR}"
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# Now, calculate the hash.
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ZIG_CACHE_HASH="sha256-$(nix-hash --type sha256 --to-base64 "$(nix-hash --type sha256 "${TMP_CACHE_DIR}")")"
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if [ "${OLD_CACHE_HASH}" == "${ZIG_CACHE_HASH}" ]; then
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echo -e "\nOK: Zig cache store hash unchanged."
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exit 0
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elif [ "$1" != "--update" ]; then
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echo -e "\nERROR: The Zig cache store hash has updated."
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echo ""
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echo " * Old hash: ${OLD_CACHE_HASH}"
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echo " * New hash: ${ZIG_CACHE_HASH}"
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help
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exit 1
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else
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echo -e "\nNew Zig cache store hash: ${ZIG_CACHE_HASH}"
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fi
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# Write out the cache file
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cat > "${CACHE_HASH_FILE}" <<EOS
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# This file is auto-generated! check build-support/check-zigCacheHash.sh for
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# more details.
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"${ZIG_CACHE_HASH}"
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EOS
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echo -e "\nOK: Wrote new hash to file: ${CACHE_HASH_FILE}"
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