diff-vm-drv.sh

#!/usr/bin/env bash
set -euo pipefail

instantiateTest() {
    test/run-tests.sh vmTestNixExpr | nix-instantiate --indirect --add-root $1 - > /dev/null
}

TMPDIR=/tmp/diff-vm-drv
mkdir -p $TMPDIR

if [[ ! -e $TMPDIR/master ]]; then
    echo "Creating test drv for master"
    if ! git diff-index --quiet HEAD --; then
        echo "There are uncommitted changes. Exiting."
        exit 1
    fi
    currentBranch=$(git rev-parse --abbrev-ref HEAD)
    git checkout master
    instantiateTest $TMPDIR/master
    git checkout $currentBranch
fi

diffTestDrv() {
    instantiateTest $TMPDIR/current
    if cmp $TMPDIR/master $TMPDIR/current; then
        echo "No changes"
    else
        nix-diff $TMPDIR/master $TMPDIR/current
    fi
}

diffTestDrv