git-pre-recieve-hook

#!/bin/bash

cleanup() {
    [ -z "${UKECHORD_PYDIR+x}" ] || rm -Rf "$UKECHORDS_PYDIR"
    [ -z "${SRC_DIR+x}" ] || rm -Rf "$SRC_DIR"
}

fail() {
    echo "$*"
    cleanup
    exit 1
}

trap "cleanup" SIGINT SIGTERM ERR

set -Eeuo pipefail

if [ "$#" -gt 0 ] && [ "$1" = "-d" ]; then
    echo "Working in diagnostic mode instead of as git hook"
    if [ -n "$(git status --untracked-files=no --porcelain)" ]; then
        fail "Can't run in diagnostic mode in dirty git state"
    fi
    echo 0000000000000000000000000000000000000000 HEAD null | "$0"
    exit
fi

while read -r OLDREV NEWREV REFNAME; do
    echo "Handling request to move $REFNAME from $OLDREV -> $NEWREV"

    if [ "$OLDREV" != "0000000000000000000000000000000000000000" ]; then
        BADCOMMITS="$(git log --pretty=%h --grep "fixup!" --grep "squash!" "$OLDREV..$NEWREV")"
        if [ -n "$BADCOMMITS" ]; then
            fail "{$(echo $BADCOMMITS | sed 's/ /, /g')} are uncaught fixup/squash commits."
        fi
    fi

    export UKECHORDS_PYDIR="$(mktemp -d -p /tmp tmp_ukechords_pydir_XXXX)"
    export SRC_DIR="$(mktemp -d -p /tmp tmp_ukechords_src_XXXX)"

    git archive "$NEWREV" | tar -x -C "$SRC_DIR"

    python -m venv "$UKECHORDS_PYDIR"

    cd "$SRC_DIR"
    (. "$UKECHORDS_PYDIR/bin/activate"; pip install --upgrade pip flit; flit install)

    if ! ./run_ci.sh; then
        fail "CI checks failed, rejecting commit"
    fi
    cleanup
done