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@@ -0,0 +1,66 @@ |
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#!/usr/bin/env bash |
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set -eu |
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status_message() { |
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printf "\\033[0;32m%s\\033[0m\\n" "$1" |
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} |
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error_message() { |
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printf "\\033[0;31m%s\\033[0m\\n" "$1" |
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} |
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SCRIPTPATH="$( cd "$(dirname "$0")" ; pwd -P )" |
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CACHE_LOCATION="${HOME}/.cabal/packages/hackage.haskell.org/01-index.cache" |
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if [ ! -f "${CACHE_LOCATION}" ] ; then |
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error_message "${CACHE_LOCATION} does not exist, did you run 'cabal update'?" |
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exit 1 |
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fi |
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if [ ! -f "${SCRIPTPATH}/cabal.project" ] ; then |
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error_message "Could not find ${SCRIPTPATH}/cabal.project, skipping index state update." |
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exit 3 |
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fi |
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cabal v2-update |
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arch=$(getconf LONG_BIT) |
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case "${arch}" in |
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32) |
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byte_size=4 |
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magic_word="CABA1002" |
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;; |
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64) |
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byte_size=8 |
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magic_word="00000000CABA1002" |
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;; |
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*) |
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error_message "Unknown architecture (long bit): ${arch}" |
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exit 2 |
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;; |
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esac |
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# This is the logic to parse the binary format of 01-index.cache. |
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# The first word is a magic 'caba1002', the second one is the timestamp in unix epoch. |
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# Better than copying the cabal-install source code. |
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if [ "$(xxd -u -p -l${byte_size} -s 0 "${CACHE_LOCATION}")" != "${magic_word}" ] ; then |
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error_message "Magic word does not match!" |
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exit 4 |
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fi |
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cache_timestamp=$(echo "ibase=16;obase=A;$(xxd -u -p -l${byte_size} -s ${byte_size} "${CACHE_LOCATION}")" | bc) |
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# If we got junk from the binary file, this should fail. |
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cache_date=$(date --utc --date "@${cache_timestamp}" "+%FT%TZ") |
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status_message "Updating index state in ${SCRIPTPATH}/cabal.project" |
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if grep -q "^index-state: .*" "${SCRIPTPATH}/cabal.project" ; then |
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awk '/index-state:/ {gsub(/.*/, "index-state: '${cache_date}'")}; { print }' "${SCRIPTPATH}/cabal.project" > "${SCRIPTPATH}/cabal.project.tmp" |
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mv "${SCRIPTPATH}/cabal.project.tmp" "${SCRIPTPATH}/cabal.project" |
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else |
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printf "index-state: %s\n" "${cache_date}" >> "${SCRIPTPATH}/cabal.project" |
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fi |
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