cache-apt-pkgs-action/pre_cache_action.sh

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#!/bin/bash
# Include library.
script_dir="$(dirname -- "$(realpath -- "${0}")")"
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source "${script_dir}/lib.sh"
# Directory that holds the cached packages.
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cache_dir="${1}"
# Version of the cache to create or load.
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version="${2}"
# List of the packages to use.
input_packages="${@:3}"
# Trim commas, excess spaces, and sort.
packages="$(normalize_package_list "${input_packages}")"
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# Create cache directory so artifacts can be saved.
mkdir -p ${cache_dir}
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log -n "Validating action arguments (version='${version}', packages='${packages}')...";
if grep -q " " <<< "${version}"; then
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log "aborted."
log "Version value '${version}' cannot contain spaces." >&2
exit 1
fi
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# Is length of string zero?
if test -z "${packages}"; then
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log "aborted."
log "Packages argument cannot be empty." >&2
exit 2
fi
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log "done."
versioned_packages=""
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log -n "Verifying packages..."
for package in ${packages}; do
if test ! "$(apt show "${package}")"; then
echo "aborted."
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log "Package '${package}' not found." >&2
exit 3
fi
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read package_name package_ver < <(get_package_name_ver "${package}")
versioned_packages=""${versioned_packages}" "${package_name}"="${package_ver}""
done
echo "done."
# Abort on any failure at this point.
set -e
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log "Creating cache key..."
# TODO Can we prove this will happen again?
normalized_versioned_packages="$(normalize_package_list "${versioned_packages}")"
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log "- Normalized package list is '${normalized_versioned_packages}'."
value="$(echo "${normalized_versioned_packages} @ ${version}")"
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log "- Value to hash is '${value}'."
key="$(echo "${value}" | md5sum | /bin/cut -f1 -d' ')"
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log "- Value hashed as '${key}'."
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log "done."
key_filepath="${cache_dir}/cache_key.md5"
echo ${key} > ${key_filepath}
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log "Hash value written to ${key_filepath}"