stargazing/auto-update

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#!/usr/bin/env sh
note() {
local IFS=' '
printf '\033[1m%s\033[0m\n' "$*" >&2
}
investigate() {
url="${1?huh}"
[ "${url#"https://github.com/"}" = "$url" ] \
&& re='/commit/' || re='/spoofed_commit_check/'
curl $curlflags "$url" | grep -F "$re" | grep -Eo '[0-9a-f]{40}'
}
set -- \
cosmo COSMO_COMMIT https://github.com/jart/cosmopolitan \
cosmo-kuroko KUROKO_COMMIT https://github.com/kuroko-lang/kuroko \
cosmo-muon MUON_COMMIT https://git.sr.ht/~lattis/muon \
cosmo-perl PERL_COMMIT https://github.com/G4Vi/perl5/tree/cosmo \
cosmo-python PYTHON_COMMIT https://github.com/ahgamut/cpython/tree/cosmo_py311 \
cosmo-yices KISSAT_COMMIT https://github.com/BrunoDutertre/kissat \
cosmo-yices YICES_COMMIT https://github.com/SRI-CSL/yices2 \
;
me="$(readlink -f "$0")" && cd "${me%/*}" || exit
curlflags="-L --no-progress-meter"
any=0
while [ $# != 0 ]; do
dir="$1" tag="$2" url="$3"
shift && shift && shift || { note 'not a multiple of 3!'; exit 255 ;}
ours="$(grep -F "$tag"= "$dir/Dockerfile" | grep -Eo '[0-9a-f]{40}' | head -n1)"
theirs="$(investigate "$url" | head -n1)"
if [ ${#theirs} == 0 ]; then
note "failed to retrieve update for $tag"
elif [ "$ours" != "$theirs" ]; then
any=1
note "updating $dir"
other="${tag%_COMMIT}_SHA256"
tgz="${url%/}"
tgz="${tgz%%/tree/*}"
tgz="$tgz/archive/$theirs.tar.gz"
sum="$(curl $curlflags "$tgz" | sha256sum - | awk '{print $1}')"
notwa-util/shed "$dir/Dockerfile" "s/$ours/$theirs/g"
notwa-util/shed "$dir/Dockerfile" "s/$other=.*/$other=$sum/g"
fi
done
[ $any = 1 ] || note "no new updates"