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💣 Machine learning which might blow up in your face 💣
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263#!/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 "${1:-}" inupgrade) shift; enable_version "$@" ;;*) exec_mafia "$@"esac