67 lines
1.8 KiB
Bash
Executable File
67 lines
1.8 KiB
Bash
Executable File
#!/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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