grenade/examples/mafia

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#!/bin/sh -eu
: ${MAFIA_HOME:=$HOME/.mafia}
: ${MAFIA_VERSIONS:=$MAFIA_HOME/versions}
latest_version () {
git ls-remote https://github.com/haskell-mafia/mafia | grep refs/heads/master | cut -f 1
}
build_version() {
MAFIA_VERSION="$1"
MAFIA_TEMP=$(mktemp -d 2>/dev/null || mktemp -d -t 'exec_mafia')
MAFIA_FILE=mafia-$MAFIA_VERSION
MAFIA_PATH=$MAFIA_VERSIONS/$MAFIA_FILE
mkdir -p $MAFIA_VERSIONS
echo "Building $MAFIA_FILE in $MAFIA_TEMP"
git clone https://github.com/haskell-mafia/mafia $MAFIA_TEMP
git --git-dir="$MAFIA_TEMP/.git" --work-tree="$MAFIA_TEMP" reset --hard $MAFIA_VERSION || {
echo "mafia version ($MAFIA_VERSION) could not be found." >&2
exit 1
}
(cd "$MAFIA_TEMP" && ./bin/bootstrap) || {
got=$?
echo "mafia version ($MAFIA_VERSION) could not be built." >&2
exit "$got"
}
chmod +x "$MAFIA_TEMP/.cabal-sandbox/bin/mafia"
# Ensure executable is on same file-system so final mv is atomic.
mv -f "$MAFIA_TEMP/.cabal-sandbox/bin/mafia" "$MAFIA_PATH.$$"
mv "$MAFIA_PATH.$$" "$MAFIA_PATH" || {
rm -f "$MAFIA_PATH.$$"
echo "INFO: mafia version ($MAFIA_VERSION) already exists not overiding," >&2
echo "INFO: this is expected if parallel builds of the same version of" >&2
echo "INFO: mafia occur, we are playing by first in, wins." >&2
exit 0
}
}
enable_version() {
if [ $# -eq 0 ]; then
MAFIA_VERSION="$(latest_version)"
echo "INFO: No explicit mafia version requested installing latest ($MAFIA_VERSION)." >&2
else
MAFIA_VERSION="$1"
fi
[ -x "$MAFIA_HOME/versions/mafia-$MAFIA_VERSION" ] || build_version "$MAFIA_VERSION"
ln -sf "$MAFIA_HOME/versions/mafia-$MAFIA_VERSION" "$MAFIA_HOME/versions/mafia"
}
exec_mafia () {
[ -x "$MAFIA_HOME/versions/mafia" ] || enable_version
"$MAFIA_HOME/versions/mafia" "$@"
}
#
# The actual start of the script.....
#
case "${1:-}" in
upgrade) shift; enable_version "$@" ;;
*) exec_mafia "$@"
esac