#!/bin/bash
# mkgroovy.sh - create a groovymame diff, if possible.
# Since the groovymame author switched to github, there are no more
# groovymame diffs to download (the ones that used to be hosted on
# google drive). This rather ugly script just uses the github API to
# get a diff we can apply.
# Note: in my testing, requesting the same diff repeatedly from
# the API results in identical files, but I'm not sure this is
# guaranteed. It only matters if you're repeatedly test-running
# this script, really.
# The github 'compare' API is basically just a wrapper for the git
# command, run on a remote repo. We can use it to download a diff
# between 2 tags, without having to clone the repo (save a ton of
# time and bandwidth).
# To understand this, see the github API docs: https://docs.github.com/en/rest/
# to see info on the repo:
# curl -H "Accept: application/vnd.github.v3+json" 'https://api.github.com/users/antonioginer/repos'
# to get a list of releases:
# curl -H "Accept: application/vnd.github.v3+json" https://api.github.com/repos/antonioginer/GroovyMAME/releases
# looks like these are in chronological order, newest first.
# DIFFURL should end up looking like this:
# curl -H "Accept: application/vnd.github.v3.diff" 'https://api.github.com/repos/antonioginer/GroovyMAME/compare/{mame0237}...{gm0237sr002e}'
# Note: 'git diff' doesn't include timestamps in its output,
# and there's no way to make the gh API include them. To
# get ccache to play nice, I have to add the timestamps to
# the context headers in the diff myself. AFAICT, that's the
# only way to get ccache to play nice with this patch. Even with
# CCACHE_SLOPPINESS=include_file_mtime, it complains that the headers
# have a different modification time than what was expected, on the
# 2nd (cached) build. I'm pretty sure this only happens because mame
# uses a precompiled header, and ccache's precompiled header support
# isn't quite perfect yet. The timestamps I put in the patch are just
# the release date of the tag. They're not quite in the same format
# 'diff' produces, but 'patch' accepts them just fine.
if [ -n "$1" ]; then
MAMEVER="$1"
else
if [ -e mame.info ]; then
source ./mame.info
MAMEVER="$VERSION"
else
echo "No MAME version argument and no mame.info in current dir."
fi
fi
MAMEVER=${MAMEVER/./}
RELEASEURL="https://api.github.com/repos/antonioginer/GroovyMAME/releases"
CMPURL="https://api.github.com/repos/antonioginer/GroovyMAME/compare/"
JSONHDR="Accept: application/vnd.github.v3+json"
DIFFHDR="Accept: application/vnd.github.v3.diff"
JSON="$( mktemp -t mkgroovy.XXXXXXXXXX.json )"
curl -sS -H "$HEADER" "$RELEASEURL" >> "$JSON"
GMTAG="$(
grep '"tag_name.*"'".*$MAMEVER" "$JSON" \
| head -1 \
| sed 's,.*"\(gm'"$MAMEVER"'[^"]*\)".*,\1,'\
)"
GMDATE="$(
grep '"created_at"' "$JSON" \
| head -1 \
| cut -d'"' -f4
)"
rm "$JSON"
case "$GMTAG" in
gm$MAMEVER*) ;; # OK
"") cat <<EOF
!!! Can't find a GroovyMAME release for MAME $MAMEVER, try again tomorrow?
EOF
exit 1 ;;
*) cat <<EOF
!!! GMTAG is "$GMTAG", which doesn't look right. Investigate.
EOF
exit 1 ;;
esac
MAMETAG="mame$MAMEVER"
DIFFURL="$CMPURL{$MAMETAG}...{$GMTAG}"
echo "=== GMTAG='$GMTAG' MAMETAG='$MAMETAG'"
echo "=== DIFFURL='$DIFFURL'"
OUTPUT="$GMTAG.diff"
if [ -e "$OUTPUT" -o -e "$OUTPUT.xz" ]; then
echo "=== $OUTPUT(.xz)? already exists and is the latest version for mame $MAMEVER, nothing to do."
exit 0 # not an error!
fi
echo "=== Downloading diff."
curl -sS -H "$DIFFHDR" "$DIFFURL" > "$OUTPUT"
echo "=== Fudging timestamps to $GMDATE"
sed -i '/^\(+++\|---\)/s,$,\t'"$GMDATE," "$OUTPUT"
echo -n "=== Output is '$OUTPUT', type "
file -b --mime "$OUTPUT"
xz -9 "$OUTPUT"
echo "=== Compressed to $OUTPUT.xz"
